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Browse practical tools, sky models and country-specific scenarios. Each tool explains its method and limitations.

Select a country independently of the interface language. Rates and fees are supplied by you unless an official dated source is explicitly stated.

Learning and planning

Reading finish planner

Turn a book into a realistic daily reading commitment. Compare a short daily session with a longer session before choosing a finish date.

Learning and planning

Spaced repetition calendar

Give each new topic a sequence of future review dates. Export the dates to your calendar and adapt the intervals when a subject needs more practice.

Learning and planning

Exam topic planner

Check whether the work on your exam list fits into your available days. Unscheduled hours identify a capacity gap rather than a personal failure.

Learning and planning

Video course planner

Account for both watching and practicing when planning a video course. Faster playback reduces viewing time, but it does not remove the time needed for exercises.

Learning and planning

Vocabulary goal planner

See how new vocabulary creates a growing review workload. Reduce your daily target if the later review peaks become difficult to sustain.

Learning and planning

Writing progress planner

Divide the remaining words in a draft among your available writing days. The daily target counts output only; editing and research need their own time.

Learning and planning

Typing speed and accuracy

Measure speed together with accuracy on a passage you choose. Use the same passage and similar conditions when comparing your own practice sessions.

Learning and planning

Mental arithmetic trainer

Practice addition, subtraction or multiplication with an adjustable question set. Review missed answers without treating the score as a measure of intelligence.

Learning and planning

Personal study cards

Turn your own question and answer pairs into revealable study cards. Mark each review honestly to see which material needs another pass.

Learning and planning

Prediction calibration

Compare stated probabilities with recorded outcomes. A confident wrong prediction contributes more error than a cautious one; a few events are not enough to establish forecasting skill.

Digital life

File transfer time

Estimate how long a download or upload could take at an effective connection speed. Network overhead, congestion and a slow server can make the real transfer longer.

Digital life

Photo and video storage

Estimate when a photo and video habit could fill the available storage. Video bitrate often has a larger effect than the number of still photos.

Digital life

Backup capacity planner

Plan storage for complete backup chains rather than counting only the newest full copy. Keep enough space for the increments needed to restore older days.

Digital life

Powerbank charge estimate

Compare stored energy in a powerbank and a device battery. Milliamp-hour labels alone cannot be compared reliably when the battery voltages differ.

Digital life

Photo print dimensions

Convert image pixels into physical print dimensions at a chosen density. Check viewing distance and print quality before ordering a large enlargement.

Digital life

Aspect ratio crop preview

Preview how much of a photograph a different aspect ratio retains. The centered crop is a geometric starting point; move the crop in an image editor to protect the subject.

Digital life

Subtitle time shifter

Correct a constant subtitle delay without uploading your text. A fixed shift cannot repair gradual drift caused by a mismatched frame rate.

Digital life

Timelapse capture planner

Plan the capture interval and final playback duration before recording a timelapse. Reserve additional storage and battery capacity for the actual camera format.

Digital life

Video chapter planner

Allocate a video duration among weighted chapters. Use the boundaries as an editing plan, then adjust them to natural transitions in the footage.

Digital life

Internet data allowance

Estimate how many days your remaining data allowance can support. Enter realistic rates for each activity; compression, resolution and background updates change actual usage.

Games and groups

Tournament fixture builder

Build fixtures for an informal league or elimination event. A bye advances a participant without a match; organizer choices determine winners.

Games and groups

Balanced team builder

Split participants into teams using scores you supply. The result balances an estimate of skill and team capacity, so discuss preferences and accessibility separately.

Games and groups

Board game scorebook

Keep round scores together and check the final ranking. Choose whether high or low totals win before entering penalties and bonuses.

Games and groups

Task rotation planner

Rotate named tasks across a group over several rounds. Assignment counts reveal frequency, while difficult tasks may still need a separate fairness discussion.

Games and groups

Group common time finder

Find overlapping availability without sharing a calendar account. Use one time zone and one day for everyone, and enter separate rows for separate time windows.

Games and groups

Event seating planner

Arrange groups around tables while keeping each group together. The layout is a feasible suggestion and may use more tables than a manually optimized arrangement.

Games and groups

Word search creator

Create a printable word search from your own vocabulary. A larger grid gives the placement algorithm more room; the answer key identifies both ends of every placed word.

Games and groups

Custom bingo cards

Make bingo cards from your own activities or words. Tap cells during play and print cards for an offline group activity.

Games and groups

Build a mini quiz

Create a timed quiz from short questions and exact answers. Spelling and normalized letter case affect scoring, so use brief unambiguous answers.

Games and groups

Closest estimate scoreboard

Compare guesses against a value revealed after everyone has answered. Smaller absolute errors rank first, and identical errors remain ties.

Science experiments

Probability experiment lab

Run repeatable coin, die or card-rank experiments. Increasing the trial count usually reduces random fluctuation, but it does not force the observed percentages to equal theory.

Science experiments

Shared birthday experiment

Explore why shared birthdays become likely in a moderately sized group. The model deliberately treats all 365 dates as equally likely.

Science experiments

Monty Hall experiment

Test staying versus switching under the classic host rules. If the host opens doors without knowing the prize or offers switches selectively, this model no longer applies.

Science experiments

Bayesian probability explorer

See how a prior probability and a signal interact. A signal with false positives can still have a low posterior probability when the original event is rare.

Science experiments

Survey uncertainty explorer

Explore uncertainty around a yes-or-no survey proportion. The interval describes random sampling variation under the model, not whether the sample represents the population.

Science experiments

Scale the Solar System

Build a tabletop or outdoor Solar System scale model. Planet diameters and orbital distances share a scale, which makes the large gaps between planets visible.

Science experiments

Light and sound travel

Compare light and sound travel over the same distance. Sound depends on the medium and conditions, while the light calculation assumes a vacuum.

Science experiments

Ideal pendulum simulator

Explore how pendulum length and gravity affect the ideal period. The animation uses a small swing and does not model damping or a large-amplitude correction.

Science experiments

Gear and pulley ratios

Compare input and output rotation for a pair of gears or pulleys. Tooth count and diameter are alternatives within the selected model; use consistent units.

Science experiments

Queue waiting simulator

Observe how random arrivals and service times create waiting. High offered utilization can produce long queues even when average service seems fast enough.

Creative workshop

Knitting stitch planner

Scale a measured knitting swatch into a target rectangle. Rounding to a pattern repeat changes the finished width, which is displayed for you to check.

Creative workshop

Bead and pixel pattern designer

Draw a small bead or pixel pattern and count the colored cells. Download a vector pattern for printing; empty cells do not represent required beads.

Creative workshop

3D print filament estimate

Estimate filament mass and length from solid material volume. Use the sliced material volume rather than the outside volume of a hollow object.

Creative workshop

Fabric cutting layout

Arrange rectangular fabric pieces across a fixed roll width. Pieces are not rotated, so you can preserve grain direction; seams must already be included in piece dimensions.

Creative workshop

Wall frame arrangement

Place a row of equal frames with equal gaps at the edges and between frames. Check mounting hardware and wall structure before drilling.

Creative workshop

Text contrast checker

Check the luminance contrast of a text and background color pair. Passing this check alone does not make a page accessible.

Creative workshop

Tiled poster printing

Split one image across several paper sheets for a larger poster. Align the overlap areas after printing and check physical dimensions on a test sheet.

Creative workshop

Tempo and practice metronome

Practice at a steady beat and build a gradual tempo ladder. Tap tempo estimates the pace of your taps; browser audio timing can vary by device.

Creative workshop

Garden spacing planner

Estimate planting positions in a rectangular bed. Spacing and edge clearance must come from the crop and growing method you intend to use.

Creative workshop

Box packing comparison

Compare six uniform orientations for identical rectangular items. The best displayed count is not a proof of globally optimal packing with mixed orientations.

Sky and zodiac

Birth chart element distribution

Count the four symbolic elements in the ten selected celestial placements. Every placement receives the same weight; no personality or compatibility score is inferred.

Sky and zodiac

Birth chart modality distribution

Count cardinal, fixed and mutable placements in a tropical chart. These are traditional astrological groupings, not measured behavioral traits.

Sky and zodiac

Sun, Moon and ascendant card

Place the Sun, Moon and ascendant side by side using a precise birth instant and location. Unknown time cannot support a definite ascendant card.

Sky and zodiac

Repeated chart placements

Look for repeated sign placements and whole-sign house occupancy. A concentration is a count under the chosen system, not evidence of a stronger personality trait.

Sky and zodiac

Retrograde placements

Inspect apparent forward and backward motion at the entered instant. A near-stationary label warns that a small change of time can change the motion classification.

Sky and zodiac

Birth time sensitivity

Explore how a possible birth-time error changes the ascendant and house placement. The sampled range illustrates sensitivity; it does not reconstruct a missing birth time.

Sky and zodiac

House system comparison

Compare equal and whole-sign house assignments while keeping the same astronomical positions. A different house result can be caused by the house convention itself.

Sky and zodiac

Planetary aspect explorer

Find angular relationships among chart positions under an explicit tolerance. Reducing the tolerance returns fewer matches; none of these matches predicts an event.

Sky and zodiac

Sun sign boundary check

Check a birth date close to a traditional Sun-sign boundary. When the time is unknown, the full local day is checked instead of silently assuming noon.

Sky and zodiac

Tropical and sidereal comparison

Compare tropical positions with a sidereal offset you supply. Different offset conventions produce different positions; this tool does not choose a named tradition for you.

Sky and zodiac

Two charts side by side

Compare two sets of planetary signs and angular separations. The comparison deliberately produces no love, friendship or relationship-success percentage.

Sky and zodiac

Friend group zodiac atlas

Create an anonymous group summary from sign indices entered by participants. Use nicknames and treat the distribution as a conversation aid rather than a character assessment.

Sky and zodiac

Zodiac conversation cards

Use a zodiac symbol as a prompt for an open conversation. Each participant supplies their own experience; the card does not claim to know their personality.

Sky and zodiac

Astrology knowledge quiz

Check your understanding of common astrology terms and their limits. Each answer includes an explanation that separates cultural symbolism from astronomical measurement.

Sky and zodiac

Learn zodiac symbols

Practice recognizing the twelve conventional zodiac symbols. Match names first, then reveal the correct associations.

Sky and zodiac

Interactive astrology dictionary

Explore six common chart concepts with short definitions. The twelve-section diagram is a schematic aid rather than a personal chart.

Sky and zodiac

Zodiac signs and constellations

Compare an equal tropical sign with the astronomical constellation behind the Sun. The two systems use different boundaries, so their labels can differ on the same date.

Sky and zodiac

Design a zodiac poster

Create a decorative zodiac poster using your own title, message and colors. The downloadable SVG contains your design without a generated personality description.

Sky and zodiac

Personal astrology journal

Keep dated personal observations without sending them to a journal service. Recording an event near a celestial event does not establish that one caused the other.

Sky and zodiac

Astrology expectation journal

Record an expectation before reviewing what happened. Preserve the original wording, then count misses and unclear outcomes as well as apparent matches.

Creative workshop

Equal and just tuning comparison

Hear with your own instrument how a chosen pure ratio differs from equal temperament; this tool calculates frequencies and cents, not audio.

Creative workshop

Polyrhythm practice grid

Print the shared subdivisions of two rhythms and see exactly where each pulse belongs.

Learning and planning

ISO week date explorer

Find the ISO week year, week number and weekday, including dates near New Year that belong to a different week year.

Learning and planning

Weighted decision matrix

Compare options against criteria you choose. Give higher scores to more desirable outcomes, including lower costs if cost is a criterion.

Digital life

Notification load summary

Estimate how notification counts accumulate across a week and identify the largest contributors using your own observations.

Learning and planning

Focus session interruption analysis

Review planned focus sessions and the time you recorded as interruptions. Compare sessions without assigning a productivity or health diagnosis.

Regional scenarios

Mortgage points break-even scenario

Compare the upfront price of discount points with the monthly payment reduction on an otherwise identical fixed-rate loan.

Regional scenarios

Warm rent and annual settlement

Separate base rent from operating-cost advances and estimate a settlement using the actual allocated costs shown on your statement.

Regional scenarios

Japan rental move-in budget

Separate the cash needed at move-in from amounts that may be refundable, using the actual terms of your rental offer.

Regional scenarios

Rail season ticket break-even

Compare a quoted season ticket with individual return tickets over the same validity period and journey.

Regional scenarios

Annual salary split across payments

Compare the size of each equal gross payment with the average income per calendar month. This is payment scheduling, not a take-home pay calculation.

Sky and zodiac

Annual profection wheel

Explore the traditional twelve-year house cycle using a known birth time and a completed age.

Sky and zodiac

Planetary midpoint table

Inspect the shorter-arc midpoint between every pair of planets. Opposite points are explicitly marked ambiguous.

Sky and zodiac

Declination parallel explorer

Compare planetary declinations and identify parallel or contra-parallel pairs within your chosen tolerance.

Sky and zodiac

Relocated ascendant comparison

Keep the birth instant fixed while changing the observation location. Compare ascendant and whole-sign house assignments.

Sky and zodiac

Equal decan positions

Locate planets within the three ten-degree subdivisions of each tropical sign without presenting a personality verdict.

Sky and zodiac

Solar return instant

Find when the Sun returns to its natal geocentric tropical longitude within a bounded interval. The result is an astronomical time used in a symbolic tradition.

Sky and zodiac

Lunar return calendar

Find when the Moon returns to its natal geocentric tropical longitude within a bounded interval. The result is an astronomical time used in a symbolic tradition.

Sky and zodiac

Selected planet return calendar

Search for direct and retrograde crossings of a planet through its natal longitude, showing all crossings in the chosen interval.

Sky and zodiac

Exact transit aspect dates

Find the UTC dates when a moving planet forms a selected angle to one natal planet. Both sides of a nonzero aspect are considered.

Sky and zodiac

Transit distance timeline

Follow a moving planet at daily UTC samples relative to one fixed natal longitude, keeping the table separate from interpretations.

Sky and zodiac

Composite planetary midpoint chart

Combine corresponding planetary positions from two known birth instants using shorter-arc midpoints. This symbolic construction is not a measured sky at a single time.

Sky and zodiac

Davison time and location midpoint

Build a chart at the midpoint of two birth instants and the spherical midpoint of two locations. The method is a symbolic relationship-chart convention.

Science experiments

Planet altitude and azimuth

Locate the Sun, Moon and planets relative to your local horizon at a chosen UTC instant. The coordinates describe the sky, not astrological influence.

Science experiments

Moon rise and set times

Find Moon rise and set events during the selected UTC day at the entered location. Some locations and dates have no event within that day.

Science experiments

Moonless dark-sky sampling

Inspect half-hour samples across a UTC day when the Sun is below astronomical twilight and the Moon is below the horizon.

Science experiments

Planet observing samples

Find half-hour UTC samples when your chosen planet is high enough and the Sun is below civil twilight. Use local weather and a horizon check before observing.

Science experiments

Twenty-four solar terms

Find the instants at which the apparent solar longitude reaches each multiple of 15 degrees during a Gregorian year.

Learning and planning

Japanese era date

Display a Gregorian calendar date using the japanese calendar supported by your browser. This tool converts from Gregorian dates; it does not infer personal traits.

Learning and planning

Gregorian to Hebrew calendar date

Display a Gregorian calendar date using the hebrew calendar supported by your browser. This tool converts from Gregorian dates; it does not infer personal traits.

Learning and planning

Gregorian to Persian calendar date

Display a Gregorian calendar date using the persian calendar supported by your browser. This tool converts from Gregorian dates; it does not infer personal traits.

Learning and planning

Chinese lunisolar date

Display a Gregorian calendar date using the chinese calendar supported by your browser. This tool converts from Gregorian dates; it does not infer personal traits.

Games and groups

Unique-solution Sudoku maker

Generate a printable Sudoku with a separate solution. Removing a cell is allowed only while exactly one solution remains.

Games and groups

Nonogram from a binary pattern

Turn a small binary drawing into row and column clues for a printable nonogram. The entered drawing is kept as an answer key.

Games and groups

Ordering logic puzzle maker

Create an ordering puzzle from your names. Each clue states that one item comes before another; the tool checks the complete solution count.

Games and groups

Escape-room clue flow planner

Arrange your own escape-room clues into dependency stages. Detect missing IDs and cycles before printing organizer cards.

Games and groups

Treasure-hunt clue cards

Prepare a numbered sequence of clue cards and a separate organizer answer sheet from locations you choose.

Learning and planning

Energy and activity reflection log

Compare your own before-and-after energy ratings by activity. Treat the log as a reflection aid, not evidence that an activity caused a medical change.

Learning and planning

Decision expectation review

Preserve what you expected, compare it with your later rating and record a lesson without rewriting the original expectation.

Learning and planning

Goal time budget conflicts

Check whether several goals fit into the same weekly time budget, including the minimum time you consider useful for each.

Learning and planning

Information source review checklist

List which source checks you have completed and which remain open. A completed checklist does not certify that a claim is true.

Digital life

Photo archive folder plan

Plan a readable year-and-event folder structure and count the photographs you intend to organize. No photos or location metadata are uploaded.

Digital life

Digital legacy preparation checklist

Keep a preparation checklist using service categories and review dates. Never enter passwords, recovery codes, identity numbers or private document contents.

Learning and planning

Birthday across calendar systems

Compare the same Gregorian civil date in several calendars, without treating calendar labels as personality or destiny indicators.

Learning and planning

Gregorian anniversary planner

List upcoming Gregorian anniversaries and explicitly flag leap-day dates that do not exist in a target year.

Regional scenarios

US withholding gap planner

Check whether the withholding in your remaining paychecks matches a tax estimate you already obtained. This supports a W-4 review without pretending to complete the form.

Regional scenarios

US federal and state tax-band scenario

Separate federal and state ordinary-income tax layers using brackets you supply for the chosen filing status and year. Example brackets are hypothetical, not an official tax table.

Regional scenarios

401(k) employer matching and vesting

Measure the employer match captured by your contribution and the part currently vested under your plan. Enter your applicable compensation and deferral limit.

Regional scenarios

HSA prorated contribution room

Estimate remaining HSA room from your verified annual limit and eligible months, counting employer contributions as well as your own.

Regional scenarios

529 education saving target scenario

Estimate the monthly saving needed for one future education spending target. Keep tuition inflation separate from the assumed investment return.

Regional scenarios

ARM first interest-rate reset

Model the first adjustable-rate mortgage reset with the index, margin and caps written in your contract.

Regional scenarios

US mixed-rate sales-tax basket

Price a basket whose products may have different local tax treatment. Enter the applicable combined rate for each product.

Regional scenarios

UK annual PAYE and employee NI scenario

Inspect an annual ordinary-employment income-tax and National Insurance scenario using your tax-year and nation-specific inputs. The example tax bands are illustrative.

Regional scenarios

UK student-loan repayment streams

Estimate an undergraduate-plan stream and, where applicable, a separate postgraduate stream using your confirmed thresholds.

Regional scenarios

UK ISA annual subscription tracker

Track new subscriptions across ISA accounts against your confirmed allowance. Separate new subscriptions from transfers between providers.

Regional scenarios

UK irregular-hours leave accrual

Calculate the 12.07% pay-period accrual model for eligible irregular-hours or part-year workers under the applicable leave-year rules.

Regional scenarios

Germany tax-class cash-flow comparison

Compare the timing effect of tax-class arrangements using payroll estimates you already obtained. A smaller withholding is not automatically a smaller final tax.

Regional scenarios

Germany distance-allowance scenario

Explore the commuting deduction using verified rules for your tax year and travel arrangement. Distance rates can change, so the example is not a current-rate promise.

Regional scenarios

China holiday and make-up workday planner

Count weekdays while applying an explicitly entered holiday and make-up workday schedule. The sample dates are not an official national holiday calendar.

Regional scenarios

Taiwan income-tax band worksheet

Trace taxable income, marginal tax and withholding for a supplied Taiwan tax-year schedule. The example bands are not statutory rates.

Regional scenarios

France family quotient cap scenario

Compare tax before and after household quotient parts, with a separately entered cap on the benefit. Example bands and cap are illustrative.

Regional scenarios

Mexico proportional aguinaldo

Estimate gross aguinaldo for a full or partial calendar year using your applicable daily wage and contractual entitlement.

Regional scenarios

Qatar contractual gratuity scenario

Check the arithmetic of a confirmed Qatar gratuity entitlement using your basic wage, eligible service and agreed days per year.

Regional scenarios

Zakat asset inclusion worksheet

Organize assets, included proportions and debts under the religious method you choose. All values must use one currency and one assessment date.

Science experiments

Planetary station calendar

Find changes between direct and retrograde apparent geocentric longitude motion over a bounded date window.

Science experiments

Equatorial coordinate horizon map

Plot objects from your own equatorial coordinates on a north-up local sky diagram and list their altitude and azimuth.

Science experiments

Meteor radiant observing geometry

Compare radiant height, astronomical darkness and Moon height during a 24-hour observing window using coordinates from a current shower notice.

Science experiments

ISS and satellite TLE pass sampler

Compute geometric satellite pass samples from two orbital element lines you provide. The built-in ISS example is historical, dated June 2019; it is not a live prediction.

Learning and planning

Sixty-pair stem and branch cycle

Explore the repeating sixty-pair cycle from its 1984 Jia-Zi reference. This year table does not assign a birth-date pillar.

Digital life

Screen time intention and usage log

Compare manually recorded screen-use categories with your own intentions, without monitoring your device or assigning a health score.

All tools

Deposit return

Compare net interest with your day-count basis and withholding.

All tools

VAT withholding

Separate the invoice total, VAT retained and seller receipts.