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Hear your audio in 60+ environments

Generate white, pink and brown noise

Generate silence files with comfort noise options

Brainwave entrainment with binaural frequencies

Generate loud creepy sounds or boost audio up to 400%

Create custom alarm and notification sounds

Generate doorbell sounds, chimes, and melodies. 35 presets, custom synthesizer, melody composer, multiple export formats.

Brainwave entrainment with pulsing isochronic tones

Generate precise audio tones, sweep frequencies, mix oscillators, play DTMF phone tones, export WAV. Web Audio API.

Generate and decode telephone touch-tones with ITU-T Q.23 precision — keypad, sequence player, microphone decoder, multi-region call-progress tones, WAV/MP3 export.

Generate ultrasonic frequencies beyond human hearing. Up to 48 kHz with 96 kHz sample rate. Real-time spectrum analyzer.

Convert text to Morse code audio

Silent ultrasonic whistle for dog training

Ultrasonic dog repellent with siren and auto-off timer

Ultrasonic rodent repellent sound generator

Ultrasonic cockroach repellent with anti-habituation patterns

Generate deterrent sounds in the 1–5 kHz bird hearing range — 8 synthesized modes, species targeting, anti-habituation timer.

Steer a little penguin over cracks and ice holes, catch fish to stay warm, and journey across the frozen wild to a distant mountain.

Online memory game for brain training and cognitive exercise

Online snake arcade game with 4 modes, power-ups, and themes

Navigate procedurally generated mazes with increasing difficulty. Four modes from easy to extreme.

Push all boxes onto the goal markers. 155 hand-crafted levels from easy to expert.

Slide tiles with arrow keys or swipe. Merge matching numbers to reach 2048!

Free volleyball game for two players. Play against AI, together on one keyboard, or online with friends.

Play the Russian Durak (Fool) card game

Click one button and watch a single live world counter tick upward together. Back your country in the daily click battle. Free, in your browser.

Toggle lights to turn them all off. Clicking a light flips it and its neighbors.

Slide numbered tiles into the correct order. Choose 3x3, 4x4, or 5x5 grid size.

Fill the entire board with one color in the fewest moves possible.

Use number clues to fill cells and reveal hidden pixel art pictures. 20+ puzzles from easy to hard.

Move the knight across every square of a 5×5–10×10 board, numbering them 1 to 100. Dead-end warnings and a solver.

Rearrange seven shapes to match the target silhouette. Drag, rotate with R, flip parallelograms with F.

10 interactive browser games designed for cats to play on tablets, phones, and screens.

A fun jumping game for kids — help a cute cat bounce from platform to platform and reach for the sky.

Rotate pipe segments to connect the water source to every endpoint. Tap or click to rotate.

Play the classic dinosaur runner game — jump over obstacles and set your high score

Free air hockey game with single player, local and online multiplayer modes, power-ups, and 4 table themes.

Turn-based artillery duel with 18 weapons, wind and destructible terrain — play vs computer, 2 players, or online.

Drop wooden shapes onto the grid, clear lines, and beat your record.

Play tic tac toe online against smart bots or with friends by shareable link

Name a city; the next must begin with its last letter.

Rules of Russian drafts: how men and kings move, why capturing is compulsory, how the five variants differ. With diagrams and hands-on lessons.

Play checkers online — Russian, international, American or English rules, vs AI bot or by shareable link

Play chess online against the engine with hints and undo

Browser remake of the Soviet LCD handheld — catch eggs in the basket

Mahjong solitaire with 144 tiles: 22 layouts, full screen, an honest hint. If the board stops being solvable, the game tells you at once.

Play rock paper scissors with buttons or real hand gestures on camera against an AI that learns from your moves.

Virtual pocket pet to feed and care for

Daily Trail logic puzzle — connect numbered points

3D dice you can watch tumble: d4–d100, advantage and disadvantage, 4d6kh3, exploding dice, odds before you roll and face statistics.

Turn order for combat: roll initiative for everyone at once, rounds, hit points, timed conditions and an SRD bestiary. Works on a phone.

Check if your VPN is working and test for IP, DNS, and WebRTC leaks. Instant anonymity score with detailed results.

Look up any IP address or domain to see its location, ISP, VPN status, and more.

Test your IPv6 support, detect connection type, compare latency, and check for leaks.

Scan any website to discover all cookies, trackers, and privacy risks in seconds.

Measure download and upload speed, ping, jitter and latency under load (bufferbloat) in 30 seconds.

Run 25+ privacy and security checks on your browser. Get a score from 0 to 100 with detailed results and recommendations.

Real entropy bits, live cohort comparison, defense test, and visual fingerprint art — see exactly how trackable your browser is.

Instantly detect your browser, OS, screen, hardware, codecs, and web API support. Copy all info for tech support or download a PDF report.

Check if WebRTC is exposing your real IP address. Detect local, public, and mDNS candidates with real-time monitoring.

Check CPU, GPU, memory, battery, storage, network, and browser capabilities. Get a health score, run a benchmark, and receive personalized recommendations.

Look up DNS records for any domain. All record types supported, results from multiple resolvers.

Look up registration details for any domain name including registrar, dates, nameservers, and DNSSEC status.

Enter a URL to see the full redirect chain with HTTP status codes, response times, and server details.

Identify the manufacturer of any network device by MAC address, generate random MACs for testing, and convert between all standard formats.

Online hearing test with audiometry, speech-in-noise, and gap detection. Get your audiogram and hearing age.

Four tests: sitting-rising, 30-second chair stands, one-leg balance and VO₂max with a fitness age. Norms by age and sex, in your browser.

For best results, use a screen with good color reproduction at full brightness in a well-lit room. Turn off night mode, True Tone and blue-light filters, which shift colors and can invalidate the test.

Online dyslexia screening with 5 assessments and PDF report

Online dementia screening test — assess memory, attention, orientation and cognitive health

Put a finger on the camera and get your heart rate in 25 seconds. The number appears only when the signal is genuinely clean.

Comprehensive vision screening with 8 tests for phone and computer. Visual acuity, near vision, astigmatism, contrast, Amsler grid and more.

Take a selfie holding a bank card on your forehead, mark the card and your pupils, and read your PD for ordering glasses.

Comprehensive autism screening with social, sensory, and masking analysis.

Records and analyzes snoring through your microphone. Get a morning report with Snore Score, loud episodes and trends.

Clinically validated depression screening with mood tracking, wellness toolkit, and PDF report.

Free adult ADHD test based on the WHO ASRS-v1.1. A 6-question screener with an instant result, plus the full 18-item checklist. Not a diagnosis.

Free tinnitus test: match the frequency of your ringing, find masking noise that covers it, and check the impact. Headphones recommended.

Pick a template or build your own. Your routine follows the device clock, counts down to the next event and runs in the background.

A period and ovulation calendar whose forecast shows a range instead of one date.

Guided breathing techniques for relaxation and focus

Anxiety tracker and mood diary — log levels, triggers and coping strategies

Instant emergency calming tool for panic attacks with guided breathing and reassuring voice.

Virtual sensory room with calming visuals and ambient sounds for self-regulation and relaxation.

A photo with a coin in frame gives the size in millimeters; a second photo gives the growth rate. Body map, ABCDE, photo overlay and reminders.

Find your stage of the menopausal transition by the STRAW+10 criteria: premenopause, perimenopause or postmenopause, from your cycle dates.

Rate menopause symptoms on the international MRS scale: 11 items, three domains, a score and a trend. Take the result to your appointment.

Check whether your case falls inside the usual age of menopause, and whether early menopause or ovarian insufficiency under 40 has been missed.

Generate or fix color palettes so they remain distinguishable under all forms of color vision deficiency.

Upload an image to compare original and colorblind views side by side.

Allow camera access, choose a CVD type and mode, then see the live filter.

Use your camera, upload an image, or enter a color value to identify any color.

The guideline covers all water in a day. Here you see how much comes from food and how much is left to drink.

Free sleep cycle calculator: best bedtime to wake up rested, or when to wake if you sleep now. Age-based targets, nap timer, 90-min cycles.

Protocol, first meal and sleep — the window, the live countdown and the stages follow from those three.

Calculate blood alcohol content from drinks

Enter a distance and the time it took to get your pace, speed and predicted race finish times.

A spoon, a cup and a piece — not only “per 100 g”.

Choose a starting point and date to get your estimated due date, gestational age and trimester.

GI is measured on 50 g of carbohydrate; you eat portions. So this calculates load.

Pelvic floor trainer with a squeeze timer, breathing cues, a week-by-week program, technique checks and a separate mode for a tight pelvic floor.

A personal immunisation schedule from your child’s date of birth: exact dates, done marks, overdue highlighting and export to your phone calendar.

Wake windows by age plus a live daily plan: nap and bedtime targets recalculate from when your baby actually woke, not from an ideal timetable.

A tickable hospital bag list split by bag: documents, labor, postnatal, baby, going home. Adapts to a caesarean, the season and a birth partner.