100% AI-Built

Personal tools, built by AI

Free, fast, and useful tools for everyday tasks. Every tool runs locally in your browser — your data never leaves your device. Built entirely by Claude AI.

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81 Tools Available
601,100 AI Tokens Used
100% AI-Generated Code

All Tools

Click any tool to use it. Each page shows the AI prompt and token count used to build it.

Aa

Word & Character Counter

Count words, characters, sentences, and paragraphs. Get reading time estimates and analyze your text instantly.
text writing
8,500 tokens
{ }

JSON Formatter & Validator

Format, validate, and minify JSON data. Instantly prettify messy JSON with syntax highlighting and error detection.
developer data
9,200 tokens
🎨

Color Converter

Convert colors between HEX, RGB, and HSL formats. Preview colors in real-time and copy any format instantly.
design developer
7,800 tokens
%

Percentage Calculator

Calculate percentages easily. Find X% of Y, what percent X is of Y, percentage change, and increase/decrease by percent.
math calculator
7,200 tokens
$

Tip Calculator

Calculate tips and split bills easily. Choose preset percentages or enter custom amounts, split between any number of people.
finance calculator
7,800 tokens
⇄

Unit Converter

Convert between units of length, weight, temperature, and volume. Supports metric and imperial with instant results.
converter calculator
8,100 tokens
Aa

Text Case Converter

Convert text to UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg case, and more. Instant conversion with copy to clipboard.
text writing
6,200 tokens

Lorem Ipsum Generator

Generate placeholder text for your designs. Choose paragraphs, sentences, or words. Copy with one click.
text writing design
5,800 tokens
🔐

Password Generator

Generate strong, secure passwords instantly. Customize length and character types. Uses cryptographically secure randomness.
security developer
6,800 tokens
64

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to text. Supports Unicode characters. Instant conversion with copy functionality.
developer text
5,500 tokens
⏱

Stopwatch

Precise stopwatch with lap times. Track intervals, compare lap performance, and export your times.
time productivity
5,200 tokens
⏳

Countdown Timer

Set a countdown timer with audio alert. Quick presets for common durations or enter a custom time.
time productivity
5,800 tokens
🎂

Age Calculator

Calculate your exact age in years, months, and days. See fun facts like total days lived and days until your next birthday.
time calculator
6,500 tokens
⚖

BMI Calculator

Calculate your Body Mass Index. Supports metric and imperial units with visual category indicator.
health calculator
5,500 tokens
🎲

Coin Flip & Dice Roller

Flip coins or roll dice with cryptographically secure randomness. Supports multiple dice and various dice types.
random games
6,200 tokens
#

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes. Uses the Web Crypto API for secure, client-side hashing.
security developer
5,000 tokens
ID

UUID Generator

Generate UUID v4 identifiers instantly. Create single or bulk UUIDs with options for uppercase and no-dash formats.
developer generator
5,200 tokens
%

URL Encoder/Decoder

Encode or decode URLs and query parameters. Supports both component encoding and full URL encoding with instant results.
developer text
5,800 tokens
🍅

Pomodoro Timer

Stay focused with the Pomodoro Technique. Work in 25-minute sessions with short breaks. Customizable intervals with audio alerts.
time productivity
7,200 tokens
$

Loan Calculator

Calculate monthly loan payments, total interest, and view amortization schedule. Works for mortgages, auto loans, and personal loans.
finance calculator
6,800 tokens
◐

Color Palette Generator

Generate beautiful color palettes using color theory. Choose from complementary, analogous, triadic, and more harmony types.
design color
7,500 tokens
.*

Regex Tester

Test regular expressions with real-time matching. See matches highlighted, capture groups extracted, and common patterns ready to use.
developer text
7,800 tokens
📈

Compound Interest Calculator

Calculate investment growth with compound interest. See how your money grows over time with different rates and contribution schedules.
finance calculator
7,200 tokens
⏰

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates. See the current timestamp live and convert in both directions.
developer time
6,500 tokens
◑

Contrast Checker

Check color contrast ratios for WCAG accessibility compliance. Test text and background colors for AA and AAA standards.
design accessibility
7,500 tokens
· −

Morse Code Translator

Translate text to Morse code and back. Listen to the Morse code audio with authentic dot and dash sounds.
encoder fun
6,800 tokens
🔓

JWT Decoder

Decode and inspect JSON Web Tokens (JWT). View header, payload, and signature with formatted output and expiration checking.
developer security
7,200 tokens
01

Binary Translator

Convert text to binary, decimal, hexadecimal, or octal and back. See character-by-character breakdown with multiple formats.
encoder developer
6,500 tokens
📅

Date Difference Calculator

Calculate the exact difference between two dates. See results in years, months, weeks, days, hours, minutes, and seconds.
date calculator
6,800 tokens
▣

Box Shadow Generator

Create CSS box shadows with a visual editor. Adjust offsets, blur, spread, and colors. Support for multiple shadow layers.
design css
8,200 tokens
🖼️

Image Resizer

Resize images locally in your browser. Set exact dimensions, scale by percentage, or use presets. Download as JPEG, PNG, or WebP.
image design
8,500 tokens
🔗

Slug Generator

Convert text to URL-friendly slugs. Remove special characters, handle accents, and create clean URLs for blogs and websites.
text developer
5,800 tokens
VII

Roman Numeral Converter

Convert between Roman numerals and Arabic numbers. Supports values from 1 to 3999 with instant bidirectional conversion.
math converter
6,200 tokens
P

Prime Number Checker

Check if a number is prime. See all factors, prime factorization, and nearby prime numbers with instant results.
math calculator
6,500 tokens
🎯

Random Name Picker

Pick random names from a list. Perfect for raffles, team selection, and fair drawings. Uses cryptographically secure randomness.
random productivity
6,800 tokens
⌨️

Typing Speed Test

Test your typing speed in words per minute. See accuracy, errors, and get rated on your performance with instant feedback.
productivity fun
7,200 tokens
💾

Data Storage Converter

Convert between data storage units. Supports bytes, KB, MB, GB, TB, and PB in both binary (1024) and decimal (1000) systems.
converter developer
6,000 tokens
⏰

Cron Expression Builder

Build cron expressions visually with an intuitive interface. Select schedules from presets or customize each field with dropdowns.
developer productivity
7,500 tokens
😴

Sleep Calculator

Calculate optimal sleep and wake times based on 90-minute sleep cycles. Wake up feeling refreshed by timing your sleep properly.
health productivity
6,800 tokens
📊

Word Frequency Counter

Analyze text to find the most common words. See word frequencies, percentages, and export results as CSV.
text writing
7,000 tokens
🌈

Gradient Generator

Create beautiful CSS gradients visually. Support for linear, radial, and conic gradients with multiple color stops and presets.
design css
7,800 tokens
📊

JSON to CSV Converter

Convert JSON arrays to CSV format for spreadsheets. Handles nested objects, escapes special characters, and supports download.
developer data
6,500 tokens
🏷️

Discount Calculator

Calculate sale prices, savings, and original prices. Find discounts instantly with preset percentages or custom amounts.
finance calculator
6,200 tokens
🎨

Color Mixer

Mix two colors together with different blend modes. See the result in real-time with HEX and RGB output.
design color
7,000 tokens
🔄

Text Reverser

Reverse text by characters, words, sentences, or lines. Includes palindrome detection and multiple reversal modes.
text fun
5,800 tokens
🔐

Chmod Calculator

Calculate Unix file permissions. Convert between symbolic (rwx) and numeric (755) formats with a visual permission grid.
developer linux
7,200 tokens
🔥

BMR Calculator

Calculate your Basal Metabolic Rate and daily calorie needs. Uses the Mifflin-St Jeor equation with activity level multipliers.
health calculator
7,500 tokens
📻

NATO Phonetic Alphabet

Convert text to NATO phonetic alphabet. Spell out words clearly with Alpha, Bravo, Charlie and the complete reference chart.
text reference
5,500 tokens
📦

CSS Flexbox Playground

Learn and experiment with CSS Flexbox visually. Adjust properties in real-time and copy the generated CSS code.
css design developer
8,000 tokens
🎱

Lottery Number Generator

Generate random lottery numbers for Powerball, Mega Millions, EuroMillions, or custom games. Uses cryptographically secure randomness.
random fun
7,200 tokens
🛡️

Password Strength Checker

Analyze password strength with detailed feedback. See entropy, crack time estimates, and suggestions for improvement.
security privacy
7,500 tokens
📊

CSV to JSON Converter

Convert CSV data to JSON format. Handles headers, quoted values, and special characters with instant preview and download.
developer data
6,800 tokens
x²

Quadratic Equation Solver

Solve quadratic equations (ax² + bx + c = 0). Find real and complex roots, discriminant, vertex, and see the formula breakdown.
math calculator
7,200 tokens
÷

GCD & LCM Calculator

Calculate Greatest Common Divisor and Least Common Multiple. See prime factorizations and all factors for multiple numbers.
math calculator
7,000 tokens
👥

Random Team Generator

Randomly divide people into teams. Perfect for sports, games, and group projects. Uses cryptographically secure randomness.
random productivity
6,500 tokens
📐

Aspect Ratio Calculator

Calculate aspect ratios from dimensions or find dimensions for a given ratio. Includes presets for common video and image formats.
design media
7,500 tokens
🎨

Color Shades Generator

Generate tints and shades from any base color. Create a full color palette with CSS variables ready to copy.
design color
7,200 tokens
&

HTML Entity Encoder

Encode special characters to HTML entities or decode them back. Includes quick insert buttons and a reference chart.
developer text
6,800 tokens
🧾

Invoice Generator

Create professional invoices instantly. Add line items, calculate totals, and print or save as PDF. All data stays local.
finance productivity
8,500 tokens
🏃

Running Pace Calculator

Calculate running pace, time, or distance. Perfect for race planning with presets for 5K, 10K, half marathon, and marathon.
health fitness
7,500 tokens
✉️

Email Validator

Validate email address format with detailed checks. See score, breakdown by parts, and suggestions for common typos.
developer text
7,200 tokens
+-

Text Diff Checker

Compare two texts side by side and highlight differences. See additions, deletions, and unchanged lines with a clear visual diff.
text developer
8,500 tokens
#

Social Media Character Counter

Count characters for Twitter/X, Instagram, YouTube, TikTok, LinkedIn, and SMS. Live progress rings show how close you are to each limit.
text writing social
7,500 tokens
{ }

JSON Path Finder

Paste JSON and explore it as an interactive tree. Click any value to see its path in dot and bracket notation, ready to copy.
developer data
8,800 tokens
IP

IP Subnet Calculator

Calculate network address, broadcast, host range, and more from any IP and CIDR prefix. Includes binary representation and common presets.
developer networking
8,200 tokens
0x

Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal, and custom bases (2-36). Grouped digits for readability with instant results.
math developer converter
7,800 tokens
📏

Pixel Ruler

Measure pixel distances on screen by clicking and dragging. See width, height, diagonal, and coordinates with ruler markings and optional grid overlay.
design developer
9,500 tokens
😀

Emoji Picker & Search

Search and browse hundreds of emojis organized by category. Click to copy to clipboard instantly with large preview and recently copied history.
text utility
12,000 tokens
🖼️

Image Cropper

Upload an image and crop it with draggable handles. Choose preset aspect ratios like 1:1, 4:3, 16:9 and download the cropped result as PNG.
design image
10,500 tokens
🖌️

Placeholder Image Generator

Generate custom placeholder images with solid or gradient backgrounds, text overlays, and preset sizes. Download as PNG for your designs and wireframes.
design developer
9,800 tokens
✅

Checklist Generator

Create checklists with drag-to-reorder, inline editing, progress tracking, and bulk actions. Export as plain text or Markdown format.
productivity writing
9,200 tokens
🧹

Whitespace Remover / Text Cleaner

Clean up messy text by removing extra spaces, blank lines, and trailing whitespace. See before/after stats with multiple cleaning options.
text writing
7,200 tokens
⚡

Electricity Cost Calculator

Calculate how much your devices cost to run. Add multiple devices, set your electricity rate, and see daily, weekly, monthly, and yearly costs.
finance calculator
8,500 tokens
🖥️

Screen Resolution Detector

Detect your screen resolution, viewport size, pixel ratio, color depth, and more. Updates live on resize with a visual diagram.
developer utility
7,800 tokens
x^n

Exponent / Power Calculator

Calculate powers, roots, logarithms, factorials, and scientific notation. Step-by-step explanations for each calculation mode.
math calculator
8,200 tokens
👁️

Color Blindness Simulator

See how colors appear to people with different types of color blindness. Simulate protanopia, deuteranopia, tritanopia, and achromatopsia.
design accessibility
8,800 tokens
🏠

Mortgage Calculator

Calculate monthly mortgage payments, total interest, and view a full amortization schedule. Includes taxes, insurance, and PMI with a visual pie chart breakdown.
finance calculator
10,500 tokens
🔒

Text Encryption / Decryption

Encrypt and decrypt text using classical ciphers: Caesar, ROT13, Vigenere, and Atbash. See the cipher alphabet and learn how each method works.
encoder security fun
9,200 tokens
🎯

Savings Goal Calculator

Calculate how long to reach your savings goal or how much to save monthly. See milestones, growth tables, and a visual progress bar.
finance calculator
9,800 tokens
Ff

Font Pair Previewer

Preview heading and body font combinations using system fonts. Adjust sizes, weights, spacing, and colors with live preview and CSS export.
design css
9,500 tokens
◢

Border Radius Generator

Generate CSS border-radius values visually. Adjust individual corners with sliders, use quick presets, and toggle advanced H/V mode for complex shapes.
design css
9,000 tokens

Why AI-Built Tools?

This site is an experiment in transparent AI development. Every tool here was created by prompting Claude AI — no manual coding involved. We publish the exact prompts used, so you can learn how to build similar tools yourself.

  • ✓ See the exact prompt used to create each tool
  • ✓ Track AI token usage for transparency
  • ✓ All tools run client-side — your data stays private
Learn More 
// Built with Claude AI

prompt: "Create a word counter..."
tokens: 8,500
model: "Claude"