Tools Directory
Explore our complete collection of free, privacy-focused utilities. All tools run client-side in your browser, ensuring your data never leaves your device.
AI Strategy & Automation
Startup & Venture Capital NEW
Freemium Compute Death Simulator
Predict if your free tier API/Server costs will outpace paid conversions and bankrupt the company.
Co-Founder Equity Engine
Calculate a fair equity split based on actual risk taken (cash injected vs. unpaid time).
Working Capital Death Spiral
Calculate the hidden cash deficit caused by growing B2B sales too rapidly on delayed terms.
Founder Opportunity Cost (DAOC)
Compare corporate salary invested in the S&P 500 versus the expected value of startup equity.
Zombie Startup Warning System
Diagnose if a startup is 'Default Dead' based on growth decay and runway.
Dynamic Runway Calculator
Calculates zero-cash date and monthly burn rates for startups.
SaaS Metrics Engine
Calculates the Rule of 40 and Burn Multiple to evaluate SaaS capital efficiency.
Cap Table Simulator
Visualizes equity dilution between founders, investors, and option pools.
Exit Waterfall Simulator
Calculates pre/post money valuations and specific founder gross payouts at exit.
Unit Economics Engine
Evaluates Customer Acquisition Cost, Lifetime Value, and precise Payback Periods.
Idea Validator Matrix
A structured checklist matrix to evaluate the baseline viability of a startup idea.
Global IP & Registries Index
Verified directory of official government portals for corporate registration and IP protection.
Legal Agreement Engine
Build a custom operating agreement, secure it with a Web Crypto hash, and export to PDF.
Freelance & Creator Economics NEW
Global PPP Pricing Engine
Calculate Purchasing Power Parity adjusted freelance rates based on client location.
Freelance LTV & CAC Engine
Calculate Client Lifetime Value and allowable Acquisition Cost to maintain profit margins.
Client Concentration Risk
Calculate the systemic financial risk of relying too heavily on a single 'whale' client.
Scope Creep Margin Quantifier
Calculate profit margin dilution and effective hourly rate drops caused by client revisions.
AI Delegation ROI Engine
Calculate if AI software subscriptions are mathematically profitable based on hours saved.
Zoom Tax Meeting Cost
Calculate the exact financial burn rate of meetings based on attendee hourly rates.
Creator Revenue Predictor
Estimate platform ad revenue and calculate baseline rates for brand integrations.
Hourly Rate Engineer
Calculate true minimum freelance rates accounting for overhead, taxes, and non-billable hours.
Global Tax Estimator
Estimate net invoice retention across tier-1 jurisdictions.
Client Red Flag Scanner
Scan client communications for semantic risks and scope creep indicators.
Dynamic Contract PDF Generator
Generate project agreements secured with an SHA-256 Web Crypto hash signature.
Wellness & Desktop Ergonomics NEW
Jaw Alignment Webcam Game
Play a game using your face! Open your mouth to jump. Helps align your jaw and engage masseter muscles.
Eye Strain & Blink Counter
Use your camera to track your blink rate to prevent dry eyes and screen fatigue.
Tech Neck Posture Alarm
A free webcam tool that acts as a posture checker. Sounds an alarm if you slouch.
Screen Distance Checker
Sitting too close ruins eyesight. Measures how far your face is from the screen.
Mental Stress Face Tracker
Tracks your eyebrows to tell you if you look stressed or angry without realizing it.
Mood Fixer & Yoga Plan
Tell us how you feel, and get a simple 5-minute stretching or resting plan to fix your mood.
Coffee Sleep Calculator
Find out exactly when to stop drinking coffee to get a good night of sleep based on caffeine half-life.
Brain Fog & Mental RAM Calculator
Calculate how much mental energy you are losing to open browser tabs and unread emails.
Brain Dump Note & Trash
Type out your worries or bad thoughts, then click destroy to throw them away for good.
Best Time to Work Calculator
Enter when you wake up and sleep to calculate the exact hours your brain is sharpest.
Phone Distraction Calculator
See how much actual focus time and money you are losing to phone distractions every day.
Screen Time Life Calculator
A scary look at how many literal years of your life you will spend looking at a phone or computer.
One Goal Focus Saver
Write down the one single most important thing you have to do today to stay focused.
Screen Detox Planner
Get a random, healthy activity that does not require a phone or computer.
Behavioral Science & Focus Mastery
Clinical Health & Diagnostics
Online Eye Chart
Use a screen-accurate 20/20 eye chart for visual referencing and monitoring.
Amsler Grid (Macular Degeneration)
A specialized grid test used to detect early signs of Macular Degeneration.
Audio Frequency Response Test
Test your ability to hear audio tones across frequencies from 20Hz to 20kHz.
Body Fat Calculator (Navy Method)
Estimate body fat percentage accurately using tape measurements and the US Navy circumference method.
Tone Frequency Matcher
Find specific audio frequencies using a tone generator to aid in sound therapy.
Visual Contrast Chart
Check for visual refractive errors using a high-contrast fan chart.
Blue Light Detector
Analyze your environment's lighting color temperature to prevent melatonin suppression and improve sleep.
Audio Frequency Age Test
Determine the highest frequency you can hear compared to average age groups.
Contrast Sensitivity Function Test
World's first comprehensive web-based CSF test. Measure contrast sensitivity across spatial frequencies using Gabor patches.
Breathing Assessment Suite
Comprehensive breathing tool combining HRV coherence training with breath hold (Cooper's) testing.
Binaural Beats Brainwave Generator
Generate binaural beats to induce specific brainwave states for meditation, focus, sleep, and creativity.
Duochrome Vision Balance Test
Test for refractive errors in your vision using the duochrome (red-green) principle for precise eye calibration.
Flicker Fusion Threshold Tester
Measure your critical flicker fusion frequency to assess visual processing speed and detect screen-induced fatigue.
Hand Tremor & Stability Test
Assess your fine motor control and hand stability through precision tracking exercises.
Headphone Driver Rattle Test
Detect headphone driver defects and rattling using low-frequency sweep tests with your microphone.
IV Drip Rate Calculator
Calculate IV drip rates, infusion times, and flow rates for medical fluid administration.
Webcam Heart Rate PPG
Estimate your heart rate from facial blood flow patterns using remote photoplethysmography (rPPG).
Digital Dementia Risk Test
Assess potential cognitive decline risks associated with excessive digital device use.
Psychology & Cognition
Professional Writing & Syntax
Online LaTeX Equation Editor
Build complex mathematical formulas visually and export them as clean LaTeX code.
Focus Reading Assistant
Read faster and retain more by converting text into a format that guides eye fixation points.
Text to Speech Preview
Test content accessibility and flow by listening to your text read aloud by various system voices.
Personal Finance & F.I.R.E.
Quantitative Finance & Analysis
System Administration & Data Safety
Digital Analytics & Research
Photo Metadata Cleaner
Protect your privacy by stripping GPS location and device metadata from photos before sharing online.
Browser Configuration Analyzer
See how trackers identify you online by analyzing your unique browser fingerprint and device hash.
Map Data Visualizer
Visualize your movement history on a private map by parsing your Google Takeout JSON files.
Communication History Graph
Visualize communication patterns and relationship history from exported chat logs over time.
Productivity Time Analyzer
Analyze your browsing habits from history files to find peak productivity hours.
Display & Monitor Diagnostics
Monitor Refresh Rate Test
Accurately test your screen's refresh rate (Hz) and check for motion blur or ghosting artifacts.
Stuck Pixel Fixer
Attempt to revive stuck pixels on your screen by flashing high-frequency color patterns.
OLED Screen Uniformity Test
Check your OLED display for permanent image retention or burn-in using grey-scale uniformity patterns.
Monitor Calibration Tool
Calibrate your monitor's gamma, contrast, and black levels for accurate color representation.
Dead Pixel Checker
Easily spot dead or stuck pixels on your monitor by cycling through solid RGB color backgrounds.
OLED Burn-In Remover
Run a pixel-refreshing loop of colors to help reduce temporary image persistence on OLED screens.
Backlight Bleed Test
Inspect your monitor for backlight bleeding and IPS glow using a pure black screen test.
Online Stroboscope
Use a flashing screen light at precise frequencies to measure the RPM of rotating objects.
Audio & Sensory Engineering
Audio Latency Test
Measure the round-trip delay of your audio setup to check for lag in Bluetooth headphones.
Microphone Frequency Analyzer
Visualize sound frequencies in real-time using a professional FFT spectrum analyzer for your microphone.
Left/Right Stereo Speaker Test
Verify your speaker or headphone channels are correctly oriented with a simple stereo audio test.
Speaker Phase & Polarity Test
Check if your speakers are wired out-of-phase, which can cause hollow sound and lack of bass.
Noise Level Meter (Decibels)
Monitor ambient noise levels and calculate safe exposure limits to protect your hearing.
Microphone Input Lag Test
Test the input lag of your microphone by measuring the delay between sound and system registration.
Phone Vibration Test
Test your device's haptic feedback engine with various vibration patterns and intensities.
Personalized HRTF (Spatial Audio) Profiler
Map your ear shape using your webcam to generate a custom HRTF profile for immersive 3D sound.
IEM/Earbud 'Seal' & Isolation Quality Test
Calculate the quality of your earbud seal using out-of-phase low-frequency tones for better spatial audio.
Hardware & Peripheral Health
Keyboard Latency Test
Accurately measure the input lag of your keyboard in milliseconds to test performance.
Mouse Polling Rate Tester
Check your mouse's polling rate (Hz) to ensure it's performing optimally for gaming.
Gamepad & Stick Drift Tester
Test game controllers for analog stick drift and dead zones with a precision visualizer.
Keyboard Ghosting Test
Test your keyboard's N-Key Rollover (NKRO) capabilities to see how many simultaneous keys it registers.
Gyroscope & Accelerometer Test
Log and visualize real-time data from your device's motion sensors to check for faults.
Battery Drain Test
Monitor real-time battery discharge rates to identify excessive power drain or faulty cells.
Printer Test Page Generator
Generate diagnostic color bars and alignment grids to test and clean your printer heads.
Pro Controller 'Snap-Back' & Jitter Map
Measure joystick 'Snap-Back' speed and map raw polling jitter to identify failing potentiometers.
Browser-Based GPU Stress & Thermal Test
Push your GPU to its limit to detect thermal throttling without installing heavy software.
Web-Haptic Feedback Vibration Designer
Test and design custom haptic patterns and check the 'Haptic Resolution' of your hardware.
Touchpad 'Dead Zone' & Gesture Heatmap
Paint your touchpad surface to find unresponsive areas and verify multi-finger gesture support.
USB-C Power Delivery 'Handshake' Sniffer
Read the power negotiation profile to verify if your charger/cable is delivering its rated wattage.
WebGPU VRAM & Thermal Stability Stressor
Stress-test graphics memory and monitor frame-rate stability to detect thermal throttling.
Network & Infrastructure
Internet Stability Test
Analyze your connection quality by measuring ping jitter and packet loss consistency over time.
Wi-Fi Speed & Stability Tester
Test your internet connection speed and monitor stability.
Find Lost Bluetooth Device
Locate lost headphones or gadgets by tracking their Bluetooth signal strength (RSSI) proximity.
DevOps & Code Engineering
Crontab Generator & Visualizer
Create and verify Cron schedules with a human-readable description of when tasks will run.
Regex Visualizer & Debugger
Understand complex Regular Expressions by converting them into interactive visual flowcharts.
Online SQLite Viewer
Open and explore SQLite database files instantly in your browser without uploading them.
Docker Compose Validator
Validate and lint your Docker Compose YAML files to catch syntax errors and configuration issues.
Web Serial Terminal
Communicate with hardware devices like Arduinos via Serial ports directly from your browser.
Creative UI & Web Design
Online LUT Previewer
Apply cinematic 3D LUTs (.CUBE files) to your images in real-time to preview color grades.
Color Blindness Simulator
Test your designs for accessibility by simulating different types of color blindness.
On-Screen Ruler
Measure pixel dimensions and alignment on any webpage with a floating transparent ruler.
Professional Creator Suite
Audio Video Sync Test
Use a visual flash and beep tool to precisely calibrate and fix audio-video synchronization issues.
Sensor Dust Checker
Find dust spots on your camera sensor easily with a high-contrast visualization tool.
Camera Field of View Simulator
Simulate and compare the field of view for different focal lengths and sensor sizes.
Invisible Image Watermarker
Embed invisible copyright data into your images that survives compression but remains undetectable to the human eye.
Embedded Systems & Maker Tech
Online Gerber Viewer
Inspect PCB manufacturing files (Gerber) layer-by-layer in your browser.
Bluetooth LE Scanner
Scan for nearby Bluetooth Low Energy (BLE) devices and inspect their services and characteristics.
Resistor Color Code Scanner
Identify resistor values instantly by scanning their color bands with your camera.
Logic Gate Simulator
Build and test digital circuits with interactive logic gates to understand boolean operations.
Engineering & Applied Physics
Emergency & Public Safety
CPR Metronome (110 BPM)
Maintain the correct rhythm for chest compressions during CPR with a 110 BPM audio-visual guide.
Metal Detector & Stud Finder
Use your phone's magnetometer to detect metal studs and wires inside walls.
Video Flashing Test (Epilepsy)
Analyze video content for dangerous flashing patterns that could trigger photosensitive seizures.
Data Science & Analytics
Biometric & Visual Analysis
Face Age Detector
Analyze facial landmarks to estimate biological age and skin health metrics for personal reference.
Real-Time Emotion Detector
Detect and visualize facial emotions in real-time to analyze reactions.
Eye Contact AI Trainer
Improve your presentation skills by tracking how well you maintain eye contact with the camera.
AI Posture Corrector
Receive alerts when you slouch to maintain healthy ergonomics using AI posture tracking.
Audio & Creator Utilities
Gaming & Performance
Mobile Utilities & Payments
Arcade & Interactive Experiments
The Wikipedia Racer
Race to click through Wikipedia hyperlinks to connect them in the fewest clicks.
Typewriter Orchestra
Turn your keyboard into a musical instrument. Every letter key triggers a specific loop.
User Interface Hell
A puzzle game where the UI fights you with moving buttons and confusing colors.
Where on Earth?
You are dropped into a random satellite view (without labels). You must guess where you are.
The CMYK Master
You are given a target color. You must mix the ink levels to match the target perfectly.
Your Life in Numbers
Input your birth date to see fascinating stats: how many times your heart has beaten, etc.
Scream to Jump
A browser game where you control a character with your voice volume.
Don't Spill The Coffee
A mobile-first game where your phone screen becomes a cup of coffee.
Shopping & Sizing
The Ring Size Matcher
Place a ring you already own directly onto your phone or computer screen to find your size.
Glasses PD Scanner
Measure the distance between your pupils (PD) using your webcam and a standard card.
The Screen Ruler
Calibrate your screen using a credit card to measure real-world objects on your monitor.
Watch & Bracelet Sizer
Visualize how different watch face sizes (40mm vs 44mm) look on your wrist.
Social Media & Insights
Instagram Follower Insights
NewSafely analyze your Instagram export data locally. Find who doesn't follow you back and identify secret fans without sharing your password.