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Plan money, business and time with transparent methods. Compare scenarios and inspect the result.

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.

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.