Free AI & Crypto Tools

Open-source tools for AI agents, crypto analysis, and directory building. No signup required.

Crypto Tools

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Wei to Ether Converter

Convert between Wei, Gwei, and Ether denominations

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Utility Tools

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Word Counter

Count words, characters, sentences, and estimate reading time instantly

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QR Code Generator

Generate QR codes for any URL or text instantly — download as PNG, all browser-based

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Regex Tester

Test regular expressions with live match highlighting, group capture, and replacement preview

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Compound Interest

Calculate compound interest with monthly contributions — year-by-year growth breakdown

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Color & Design

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Color Picker

Enter a hex color and get RGB, HSL, and OKLCH values instantly.

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Contrast Checker

Check color contrast ratios for WCAG AA and AAA compliance.

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Conversion

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin temperature scales

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Weight Converter

Convert between kilograms, pounds, ounces, grams, and stone

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Length Converter

Convert between meters, feet, inches, centimeters, millimeters, yards, miles, and kilometers

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Developer Tools

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chmod Calculator

Calculate Unix file permissions from symbolic or numeric notation

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Subnet Calculator

Calculate IP ranges, subnet masks, and host counts from CIDR notation

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Education

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GPA Calculator

Calculate your GPA on a 4.0 scale from course grades and credit hours

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Finance

Loan Payment Calculator

Calculate monthly loan payments with full amortization breakdown

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Mortgage Calculator

Calculate mortgage payments including taxes, insurance, and PMI

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Paycheck Calculator

Estimate take-home pay after federal tax, FICA, and deductions

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Health & Wellness

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Calorie & TDEE Calculator

Calculate your Total Daily Energy Expenditure and daily calorie needs based on activity level.

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Pregnancy Due Date Calculator

Estimate your pregnancy due date and trimester timeline based on your last menstrual period.

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Math & Science

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Fraction Calculator

Add, subtract, multiply, or divide fractions and mixed numbers

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Standard Deviation Calculator

Calculate standard deviation, variance, and other statistics for a data set

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Percentage Calculator

Calculate percentages, percentage change, and percentage of a number

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Productivity

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Coherence Engine

Paste your messy brain-dump and get back the one clear next move that unlocks the rest

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Text & Writing

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Case Converter

Convert text between uppercase, lowercase, title case, sentence case, camelCase, snake_case, and kebab-case.

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CSV to JSON Converter

Convert CSV data to JSON format, using the first row as headers.

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Time & Date

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Days Between Dates

Calculate the exact number of days between any two dates

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Timezone Converter

Convert time between different timezones worldwide

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