Sitemap — Page 4

Cognitive function screening — test attention, memory, reaction time and spatial reasoning

Scientifically-designed IQ test with adaptive matrices, spatial reasoning, and pattern recognition. Get accurate IQ score with confidence interval.

Check your mental sharpness with 7 scientific assessments. Find out your mental age.

Seven axes, an SVO slider and an allocation task: the test separates thrift from stinginess and compares what you say with what you choose.

Find your purpose with the ikigai map: 4 directions, the validated Ikigai-9 scale, a personal diagram and a workshop. Online, no sign-up.

Check yourself with the Bergen Work Addiction Scale and a 5-dimension map: compulsion, overload, the toll on life. Online, no sign-up.

Both sides of trust at once: how much you extend to people and how much you return when they extended it to you. Trust game included.

Five risk domains scored apart and a Holt-Laury lottery that yields a real coefficient. No single score: boldness is not one dial.

Emotional intelligence measured as a skill, not a questionnaire: read real voices and faces, then see the gap between your score and your self-image.

Your four-letter type plus a full Big Five profile: 5 traits and all 30 facets of character with percentiles. Online, no sign-up.

Three scales instead of one score: general, work-related and people-related exhaustion — plus whether this is burnout or just fatigue.

Measure noise level in decibels

Five ways to read rotation speed: by sound, by a marker in the camera, by the phone's gyroscope, by screen strobe and by a printable strobe disc. Plus lamp flicker and PWM.

See your real speed from GPS: max, average, distance and track export. Check what your dashboard reads against true speed. No install.

Digital spirit level using your phone's sensors — 2D surface bubble, inclinometer, plumb line and camera AR with angle export.

Browser compass with true north corrected for declination, bearing hold, a sighting mode and an honest accuracy figure.

Online protractor with transparent overlay and photo measurement — mm calibration, multi-angle, PNG/PDF/JSON export. Handy for builders, carpenters and students.

Find the elevation at any point on a map, build a profile along a route and get the slope in percent and degrees. Coordinates next to the height.

Free online ruler in actual size. Calibrate to your screen and measure in cm, mm and inches — on screen or on a photo.

A digital inclinometer that reads tilt in degrees, percent, per-mille and roof pitch — plus a clinometer mode for the height of trees and buildings.

Press Start Camera to activate your camera. The tool will convert light levels into audio tones.

Play acoustic guitar with realistic sound synthesis. 70+ chords, strum and arpeggio modes, 5 tunings, recording.

Strobe tuner that measures string inharmonicity and builds your piano's stretched curve. 88 keys, unisons, interval checks.

Microphone-based guitar tuner with real-time pitch detection. 6 tunings, A4 reference, ±1 cent accuracy.

Interactive 88-key virtual piano with 5 voices, MIDI input, recording, learn mode, and chord/scale assistance. Free, no signup.

A dual-engine virtual organ: tonewheel Hammond with drawbars, Leslie and percussion, plus a pipe/church organ with stops and cathedral reverb.

A realistic virtual flute you play in the browser — six flute types, a live Boehm fingering chart, breath and vibrato control, MIDI and recording.

Virtual kalimba with step sequencer, 8-track looper, reverb, delay, Web MIDI in and song library.

AI-generated endless piano music for focus and relaxation

Create beats and music patterns in your browser

A live-playable drum kit with WebMIDI, recording, metronome, grooves and lessons — no signup.

Use your camera as a mirror with zoom, filters and screenshot

Calendar with tasks and repeating entries. Week, month, list. Subscribe from Google or Apple, publish your schedule on your profile.

Fill your entire display with any solid color — presets, HEX/RGB/HSL, brightness, color temperature, and one-click edge-to-edge fullscreen.

Count events with one tap: people at the door, knitting rows, training laps. Several categories at once, step, target, undo, pace and CSV export.

Register an e-bike or check if one is stolen

Replace the name on the finished card — the rest builds itself.

Build your own sheet of labels and print it so the ink lands inside the die cuts.

Build numbered event tickets with QR codes, print up to thousands at once, then scan them at the door to check guests in. Free, in your browser.

Decode Morse code to text

Keep Bluetooth & audio devices connected

Keep your screen on and prevent it from sleeping — online tool

Generate random numbers, roll dice, flip coins, pick from lists, create passwords. Crypto-secure, instant, free.

Generate random words, letters and ideas for games, writing prompts and brainstorming. Instant and free.

Turn your screen into a flashlight — with strobe, SOS, Morse code, countdown flash, and ambient lamp modes.

Browse 1400+ curated names for dogs, cats, parrots, hamsters, rabbits, fish, turtles, horses, reptiles, ferrets, guinea pigs and birds — filter by gender, style, popularity and length.

AAC communication board with symbols and keyboard for nonverbal communication

Name one step, set a short sprint, and put distractions on a list instead of into your browser.

Visual metronome for speech pacing with breathing coordination and recording.

Visual daily schedule with icons, timers, and transition alerts for autism and ADHD.

Customizable reading aid with dyslexia fonts, spacing, focus cues, overlays and text-to-speech.

Visual reading ruler and color overlay to help with dyslexia and visual stress.

Camera color identifier for blind and visually impaired users

Pick two colors to check contrast ratio and colorblind visibility.

Free live captions in your browser. See speech as text in real time.

Monitor loud sounds remotely.

Search and learn sign language visually.

Practice fingerspelling in 8 sign languages with interactive quizzes and hand shape diagrams.

Turn music into phone vibration in time with the beat.

Point your camera at text or upload a photo — the tool recognizes it and reads it aloud.

Upload a PDF, DOCX or TXT and listen to it as an audiobook — with bookmarks, sleep timer and sentence-by-sentence navigation.

Turn images into musical melodies or pure spectrogram sound.

Navigate by sound with a 3D spatial audio compass.

Virtual keyboard optimized for single-hand typing with large keys and word prediction.

Control this page with voice commands: scroll, click, go back, and more.

Enter the rise to climb and pick a slope ratio to get the ramp length, run, slope percent and angle.

Scan your PC hardware and get a gaming readiness score with recommendations.

Measure your reaction speed in visual, audio, and reflex modes with millisecond precision.

Practice your mouse aim with 4 game modes and difficulty levels

Measure your network latency to game server regions worldwide

Measure the delay from mouse click or key press to visual response with detailed lag breakdown.

Calculate voltage, current, resistance, and power instantly. Interactive Ohm's Law wheel, animated circuit diagram, and practical presets.

Decode resistor color bands or find band colors by resistance value. Interactive SVG, 4/5/6 bands, tolerance range, E-series matching.

Decode 3-digit capacitor markings to pF/nF/µF or find the code from a capacitance value. Voltage ratings, tolerance codes, unit converter.

Decode SMD component markings — 3-digit, 4-digit, and EIA-96 codes for resistors and capacitors. Reverse lookup and package size reference.

Calculate the current-limiting resistor for any LED circuit. Color presets, series/parallel arrays, power warnings, nearest E24 value.

Calculate voltage divider output, find R1/R2 from desired Vout, E24 matching, load effects, tolerance analysis, and power dissipation.

Find the right wire gauge for your project. AWG↔mm² converter, voltage drop calculator, ampacity tables, copper and aluminum support.

Calculate minimum PCB trace width for a given current using IPC-2221 standard. Supports internal/external layers, multiple copper weights, and voltage drop.

Calculate NE555 timer circuits — astable and monostable modes. Frequency, duty cycle, waveform preview, and reverse component calculation.

Time constant τ = RC, capacitor charge and discharge by τ steps, RC filter cutoff frequency and the charge curve.

Base resistor for a transistor switch: base current with a saturation margin, E24 value rounded down and resistor power.

Build and simulate electronic circuits in your browser. Drag-and-drop components, draw wires, real-time voltage and current readouts.

A virtual solderless breadboard: plug parts into holes, run jumpers — the circuit really computes.

Lay parts out on a solder board, draw the traces and check the circuit before you pick up the iron.

Measure a battery on your calibrated screen, or print a true-to-size gauge — then read which battery it is.

Move the feedback gain and watch the reservoir’s memory change.

Set alarms and timers with custom sounds

Free online timer: run several labeled countdowns at once, plus Pomodoro and HIIT interval modes, fullscreen, and alarm sounds.

Six clock types with educational guides and timezone support.

Precise online stopwatch with laps, splits, sparkline and shareable link

Live countdown timer to any date with themes, full-screen and shareable link

Set a duration and watch the sand run through the glass.

Count days since the last incident, track your record, and show it full-screen, in print or by link.

Convert Unix timestamps to ISO 8601, UTC, RFC 2822 and relative time, or any date back to epoch seconds. Batch mode and live counter. Free.

Convert between 24-hour military time and 12-hour AM/PM format with live sync, batch mode and reference chart.

Light a virtual candle and observe a moment of silence to honor someone's memory. Timer, ambient sounds, personalization.

Visual countdown timer for ADHD time blindness with event tracking and alerts

A timer where the remaining time is a shape, not a number.

Free chess clock for two players on one device — Bullet, Blitz, Rapid, Classical with Fischer, Bronstein and delay modes.

Set multiple cooking timers with preset recipes and sound alerts.

Free age calculator: your exact age in years, months, days, hours, minutes, seconds — plus next birthday countdown. Free, in-browser.

Days between two dates, business days and holidays

See exactly how many days you have lived since birth — with weeks, hours, a live counter, milestone dates and your life in weeks. Free.

Free work-hours calculator: enter shifts with start, end and breaks, get weekly totals, overtime and pay. Export CSV. Free, in-browser.

Convert between Julian and Gregorian dates