Unit Converter

Translate

utility

Free AI translation app with auto language detection, EN↔中文 default, tabs for English/中文/Français/Español/日本語 + full dropdown of 45+ languages. Includes dictionary panel (definition, pronunciation, voice, similar/opposite words, example sentences) and localStorage history. Built on free APIs, no sign-in required.

Habit Tracker

utility

Family habit tracking with multi-profile support, minutes-based logging, and lower-is-better screen-time budgets. Track daily habits for the whole family — EN default, 中文 toggle included.

Vault — Zero-Knowledge Password Vault

utility

A zero-knowledge, military-grade password vault that runs entirely in your browser. KDBX4 format with ChaCha20 encryption and Argon2id key derivation — your secrets never leave your device. Everything is encrypted and decrypted client-side via WebCrypto: no accounts, no uploads, no server-side storage. Quick unlock with Touch ID/FaceID/Windows Hello via WebAuthn passkeys, and full portability with standard .kdbx files that open in KeePassXC, Strongbox, and KeePassDX. Your vault, your keys, your device.

Base64 Encoder / Decoder

utility

Encode and decode Base64 strings instantly with auto-processing, URL-safe mode, swap function, and file-to-Base64 conversion. Supports Unicode text encoding with drag-and-drop file uploads up to 5MB. Copy, paste, and swap between encode/decode modes seamlessly. 100% client-side.

Word Counter & Text Analyzer

utility

Real-time text analysis tool with word count, character count (with and without spaces), sentence and paragraph counts, reading and speaking time estimates, Flesch reading ease score, keyword density with stop-word filtering, lexical diversity, average word/sentence length, and word goal progress bar. Perfect for writers, students, and content creators.

JSON Formatter

utility

A clean, fast JSON formatter and validator. Paste, format, minify, and validate JSON instantly in your browser. Features syntax highlighting, tree view, error detection, and one-click copy. No server, no tracking — everything runs locally.