Free Science-Backed Interactive Calculators
Accurate mathematical models to audit storage bloat, calculate fasting autophagy, estimate walking fat burn, and measure digital screen time dividends.
Video Compressor for Reels & TikTok
Shrink videos for Instagram, TikTok, WhatsApp or a target size in MB. Runs 100% in your browser, nothing is uploaded.
Social Image Sizes & Cropper
Exact image sizes for Instagram, TikTok, YouTube, Facebook, X and LinkedIn, with a drag-and-zoom cropper and safe-zone guides.
Hashtag & Caption Generator
Get balanced hashtag sets and ready-to-post captions for Instagram, TikTok and YouTube Shorts. Pick niche, tone and goal.
Video Metadata Stripper
See hidden GPS, device and date data inside MP4 and MOV videos and remove it without re-encoding. 100% on-device.
Engagement Rate Calculator
Calculate engagement by followers or views and compare against benchmarks for your platform and account size.
Online Countdown Timer & Pomodoro Clock
Precision digital countdown timer with instant 5, 10, and 15-minute presets, structured Pomodoro intervals, fullscreen desk clock, and zero-latency Web Audio alarms.
Password Strength & Entropy Estimator
Evaluate Shannon entropy bits, detect pattern weaknesses, and estimate realistic brute-force crack times across RTX 4090 GPUs. Generate Diceware passphrases locally.
Ambient Noise & Sleep Machine
Synthesize pure White, Pink, Brown, and Green noise in real-time. Multi-track mixer with ocean waves, rain, binaural beats, and sleep timer.
Wi-Fi QR Code & Guest Card
Generate custom scan-to-connect Wi-Fi QR codes with 100% in-browser privacy. Print elegant table tent guest cards for Airbnb, home, or office.
Due Date & Pregnancy Milestones
Calculate your Estimated Date of Delivery (EDD), track 40-week fetal development with fruit size comparisons, and map clinical ultrasound milestones.
TDEE & Macro Split Calculator
Calculate your exact Total Daily Energy Expenditure (TDEE), BMR, and targeted protein, fat, and carb grams. Meal planner and weekly zig-zag calorie cycling.
Sleep Cycle & REM Calculator
Calculate optimal bedtime and wake-up times synced with natural 90-minute ultradian sleep cycles. Avoid sleep inertia, optimize REM & deep sleep, and plan NASA power naps.
Video Speed Controller & Slow-Mo
Speed up or slow down videos with pitch-preserved audio. 30fps frame-by-frame analysis, duration savings math, and instant export.
Video Audio Extractor
Extract crystal-clear audio from MP4, MOV, and WebM videos directly in your browser. Waveform trimmer, +10dB gain boost, and lossless WAV or MP3 export.
TikTok & Reels Safe Zone Previewer
Real-time 9:16 platform overlay checker for TikTok, Instagram Reels, and YouTube Shorts. Keep subtitles, CTAs, and hooks clear of UI buttons.
HEIC to JPG & PNG Converter
Batch convert iPhone HEIC and HEIF photos to high-quality JPG or PNG. 100% private, client-side WebAssembly execution with ZIP export.
Aspect Ratio & Bitrate Calculator
Calculate video canvas aspect ratios, crop dimensions, resolution scaling, and estimate encoded video file sizes across H.264, HEVC, and ProRes.
Online Bluetooth Radar & Scanner
Scan for nearby Bluetooth Low Energy (BLE) peripherals, visualize live radial radar sweep, measure RSSI decibels, and estimate distance.
Online Phone Vibration Test
Test vibration motor strength, diagnose Taptic Engine resonance, compose custom haptic patterns, and inspect tactile feedback frequency.
Online Camera Resolution & FPS Test
Benchmark live 4K/1080p camera resolution, measure real-time FPS & jitter, inspect RGB histograms, and scan for sensor dead pixels.
Online Hearing Test & Audiogram
Measure left/right ear pure-tone thresholds from 125Hz to 8kHz, plot an interactive clinical audiogram, and calculate biological ear age.
Online Photo EXIF Inspector & Stripper
Inspect hidden GPS coordinates, camera hardware serials, and exposure settings. Clean and strip tracking metadata 100% loss-free.
Online Decibel Meter & Sound Level Detector
Measure ambient noise levels in real-time dB SPL with animated radial gauge, live FFT frequency spectrogram, and peak holding.
Online Internet Speed & Latency Test
Measure download bandwidth, upload throughput, ping latency, and jitter with a real-time analog speedometer gauge.
OLED & LCD Screen Diagnostic Suite
Audit displays for dead pixels, OLED burn-in, 120Hz ProMotion refresh rate, and 5% gray uniformity with full-screen test patterns.
Online Speaker Cleaner & Water Eject
Eject trapped water droplets and shake loose speaker dust using 165Hz acoustic pressure pulses and harmonic sound sweeps.
iPhone Storage & System Data Calculator
Estimate recoverable gigabytes across duplicate HEIC photos, bloated 4K video clips, and stubborn iOS system data caches.
Camera Roll Clutter & Duplicate Calculator
Calculate immediate space savings by wiping duplicate bursts, temporary receipts, and uncompressed video recordings.
Screen Time & Attention Dividend Calculator
Discover how many waking years you lose to algorithmic feeds and calculate the lifetime hours reclaimed through strict mode.
Intermittent Fasting & Autophagy Timeline
Track your cellular recycling milestones from blood sugar stabilization and ketosis to peak cellular autophagy.
Walking Steps to Calorie & Fat Burn
Convert daily step counts, walking pace, and body weight into calories burned, grams of fat oxidized, and snack equivalents.
Smoking Cessation Cost & Health Calculator
Calculate your compounding financial savings from quitting tobacco, count cigarettes avoided, and see pulmonary recovery stats.
Infant Wake Window & Nap Sleep Calculator
Pediatric wake window calculations by month to optimize bedtime routines, avoid overtiredness, and lengthen night sleep stretches.