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CMYK Color Generator
Generate CMYK color values instantly for print design. Perfect for designers to create accurate color codes for posters, flyers, and branding.
Image Metadata Adder — Add EXIF Data to Photos Online
Add EXIF metadata to JPEG images online. Embed title, description, author, copyright, and creation date—secure, fast, and 100% client-side.
Euler Totient Calculator
Calculate Euler’s Totient φ(n) instantly. Fast, accurate, and ideal for number theory, RSA encryption, and prime factorization learning.
Fermat Numbers Checker & Generator
Check if a number is Fermat or generate Fermat numbers quickly! Free online tool for mathematicians and number theory enthusiasts.
Happy Numbers Checker & Generator
Check if a number is happy or generate happy numbers within a range. Explore the fascinating world of happy numbers!
Catalan Numbers checker and generator
Check if a number is Catalan or generate a sequence of Catalan numbers online. Fast & accurate. Explore combinatorial mathematics!
Deficient Numbers Checker and Generator
Check if a number is deficient or generate a list of deficient numbers. Free online tool for number theory calculations.
Image Sharpness Enhancer — Instant JS-based Photo Sharpening
Sharpen photos instantly in your browser. JS-only Image Sharpness Enhancer with sliders, live preview, comparison slider, and PNG download — no server required.
Pattern Completion Speed IQ Test – 10-Second Brain, Memory and Reflex Analyzer
Test your brain with a fast 10-second pattern IQ challenge. Measure memory, reflexes, and accuracy instantly. Free, quick, and highly engaging.
Armstrong Numbers checker and generator
Check if a number is an Armstrong number or generate a list of Armstrong numbers within a given range. Free and easy to use!
Harshad Numbers checker and generator
Check if a number is a Harshad number or generate a list of Harshad numbers within a specified range. Easy to use and accurate!
ADHD Focus Simulator – Distractions, Time Warp and Overload Test
Experience ADHD-style distractions, time warp and overload. A free online simulator to feel and measure real-world focus challenges.