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- ReversiGamesPlay Reversi online against the computer or a friend. Trap your opponent's discs between yours to flip them to your colour, and finish with the most discs on the board. Three computer levels, take back, and pale spots on the baize that show where you can play.
- Rocket LaunchGamesBuild a rocket and fly it to orbit in a simple rocket launch simulator. Pick a payload and up to three stages, then climb through the air, tip over, drop empty stages and reach orbit. Five missions run from a 10 km hop to a flight past the moon.
- Roman Numeral ConverterCalculatorsConvert numbers to Roman numerals and Roman numerals back to numbers, from 1 to 3999: 2026 is MMXXVI and MCMXCIV is 1994. See how each numeral adds up, and get the standard spelling when one is written an unusual way.
- Rotate PDFPDF toolsRotate the pages of a PDF by 90 or 180 degrees, every page or just the ones you pick, and save the file so it opens the right way up everywhere. Fix scans that came out sideways or upside down in a few clicks.
- Rotate VideoVideo toolsRotate a video 90° clockwise, 90° anticlockwise or 180° so it plays the right way up in every player and app. Fix sideways or upside-down phone videos and download an MP4 with the sound kept.
- Running LogEveryday appsLog your runs and walks with distance and time, and see your pace, splits and laps, heart-rate zones, weekly or monthly totals against a goal, your training load, race records and how far each pair of shoes has gone. Includes a pace calculator, a race time predictor, private GPX import with a route map, and 5K and 10K training plans with Pro.
- Savings TrackerEveryday appsSet savings goals with a target, a date and a photo, log what you put in, and see how far you've come, how much to set aside each week or month and where your balance is heading. Plan repeating deposits that log themselves, move money between goals, save toward a goal together with a partner, and try the 52-week challenge and other savings challenges, with nothing linked to your bank.
- Scientific CalculatorCalculatorsA full scientific calculator for your browser: sin, cos, tan and their inverses in degrees or radians, log and ln, powers, roots, factorials, π and e, brackets, memory and a history of your answers. Type a whole sum or use the keys.
- Scientific Notation ConverterCalculatorsConvert any number to scientific notation, E notation and engineering notation, or turn 6.02 × 10^23 back into a plain decimal. Round to significant figures, see the SI prefix, and count the significant figures in what you typed.
- Screen RecorderVideo toolsRecord your whole screen, one window or a single browser tab, with the tab's sound and your voice from the microphone. Pause when you need to, watch it back and download an MP4 or WebM. No sign-up, no watermark and no time limit, and the recording stays on your device.
- Sea BattleGamesPlay Sea Battle against the computer in your browser: hide five ships on a 10×10 sea, then take turns firing one shot at a time until one fleet is sunk. Choose Easy, Medium or Hard, place your ships by hand or at random, and keep a running tally of games won and lost.
- Shooting GalleryGamesPlay a fairground shooting gallery in your browser: 60 seconds and a cork gun to knock down stars, cans, bottles and bull's-eye plates as they glide past on three rails. Catch the rare moon for 100 points, leave the flowers alone, and build a combo of up to four times your points with hits in a row.
- Sign PDFPDF toolsSign a PDF without printing or scanning: draw your signature, type your name in a handwriting-style font, or upload a photo of your signature, then place it anywhere on the page. Add it to as many pages as you need and download the signed PDF.
- SIP CalculatorCalculatorsSee what a monthly SIP or a one-time lump sum could grow to: enter the amount, an expected yearly return and the years, add a yearly step-up if you like, and get the amount invested, the estimated returns, the maturity value and a year-by-year table in rupees. Returns from mutual funds aren't guaranteed, so treat it as an estimate.
- Sleep & Focus SoundscapesEveryday appsPick a soundscape and a rhythm. For focus, work in rounds (25 and 5, 50 and 10, or your own) while the sound softens on every break and a soft chime marks each change. For sleep, choose a scene and a length and it fades slowly to silence. Save your own routines, keep a streak and a weekly chart, and jot down in the morning how long it took to fall asleep. Free, no sign-up, works offline once installed, and the sounds never leave your device.
- Sleep CalculatorCalculatorsFind the best time to go to bed or wake up using 90-minute sleep cycles. Enter when you need to wake up, or choose sleep now, and add how long you take to fall asleep. A guide based on averages, not medical advice.
- Sleep TrackerEveryday appsLog when you went to bed, when you woke, how well you slept, naps, coffee and drinks, and see your hours against a goal, your sleep debt, your energy through the day with a caffeine cut-off, and how steady your bedtime is. A sleep window plan based on CBT-I, your chronotype and a dream journal are built in.
- Sliding PuzzleGamesPlay the classic sliding puzzle online: the 15 puzzle on a 4×4 board, or the easier 3×3 and harder 5×5. Slide the tiles back into order in as few moves as you can. Every shuffle can be solved.
- SnakeGamesPlay the classic Snake game in your browser. Steer the snake to eat apples, grow longer with every bite and avoid the walls and your own tail. Play with arrow keys, WASD or swipes, at three speeds, with walls or wrap-around edges.
- SolitaireGamesPlay classic Klondike Solitaire in your browser, with one-card or three-card draw. Build the four suits from ace to king, tap a card to send it to the best place or drag it, and use undo, hints and an automatic finish. Your best time is kept for each draw mode.