Tool Catalog

Explore the complete catalog of privacy-first browser tools. Access free hardware testers, dev utilities, and audio analyzers, all running client-side.

ZERO UPLOAD · ALL LOCAL
Hardware & Display Diagnostics Run physical-world hardware and display tests directly in your browser. Verify monitor pixels, webcam lighting, and input lag locally. Start testing now.
Live Tools Last Update
Webcam A/V Sync & Latency Meter Measure the millisecond offset between your webcam and microphone — paste the result directly into OBS.
2026-05-20
Gamepad & Joystick Drift Tester Diagnose analog stick drift and dead buttons in your browser.
2026-04-30
Web MIDI Keyboard Latency Tester Test MIDI keyboards for dead keys, ghost notes, and USB-to-browser input latency — 100% local, no DAW required.
2026-04-24
Mouse Polling Rate & Input Lag Tester Verify your mouse polling rate and browser input latency. PointerEvent-based, 100% local.
2026-04-24
Webcam Lighting & Framing Analyzer Lighting balance, face framing, and resolution diagnostics — 100% local, nothing uploaded.
2026-04-22
Dead Pixel & Flicker Test Suite Backlight bleed, motion ghosting, and color banding checks, tested fullscreen and entirely client-side.
2026-04-21
In Development Planned Release
Live Signal Debugger Visualize real-time USB/Serial/Bluetooth signals from Arduino, sensors, and MIDI controllers — WebSerial-based, zero install.
2026-11
WebUSB Hardware Flasher Flash firmware to ESP32, Arduino, and Raspberry Pi Pico directly in your browser — no IDE or drivers required.
2026-11
Developer Parsers & Encoders Format, encode, parse, and inspect developer data entirely client-side. Protect sensitive code and tokens with these secure, zero-upload dev tools.
Live Tools Last Update
JSON Formatter, Validator & Tree Viewer Pretty-print, minify, and browse JSON in a collapsible tree with syntax highlighting.
2026-07-10
Regex Tester & Match Debugger Live match highlighting, capture groups, and step-through debugging for any pattern.
2026-07-10
UUID v1, v4 & v7 Generator Five display formats, cryptographically random output, and 100% local generation.
2026-06-28
Hash Generator: MD5, SHA-1, SHA-256 & SHA-512 MD5, SHA-1, SHA-256, SHA-512 hashes and HMAC — all computed locally, nothing uploaded.
2026-05-20
Big Log Explorer Filter, search, and graph 500 MB+ log and JSONL files locally — Web Workers and IndexedDB, nothing uploaded.
2026-05-19
Prompt Token Counter Count tokens for GPT-5.6, Claude Opus 5, Gemini 3.6, Kimi K3, and 33+ more AI models — live pricing updated daily, nothing leaves your browser.
2026-05-19
SQL Data Workbench Query local files with SQL — Parquet, Arrow, Feather, Avro, DBF, Excel, CSV, JSON and more. Zero upload, runs entirely in your browser.
2026-05-15
Base64 Text & File Encoder/Decoder Converts between raw data and Base64 entirely client-side, so nothing ever leaves your browser.
2026-05-06
Cron Expression Parser & Next-Run Preview Translate cron syntax into plain English and see upcoming run times at a glance.
2026-04-25
JWT Decoder & Claims Inspector Decode the header and payload, check expiry and claims, all client-side.
2026-04-24
In Development Planned Release
Text / Code Diff Viewer Side-by-side and unified diff with line-level highlighting.
2026-10
Binary Package Differ Diff two ZIP archives or build artifacts in-browser — file-level tree view, size delta, and byte-level changes. Zero upload.
2026-10
WASM Binary Inspector Inspect and decompile WebAssembly binaries to WAT in your browser — memory map, exports, imports, zero upload.
2026-10
Text Analysis Tools & Converters Analyze readability, convert case formats, and perform text diffs natively in your browser. Ensure absolute privacy with offline-capable text utilities.
Live Tools Last Update
Offline & Private AI Text Detector Score how AI-generated your writing reads, fully offline and private in your browser, with no signup and no paywall.
2026-08-17
Text Case Format Converter camelCase, snake_case, SCREAMING_SNAKE, kebab-case, Title Case, and more.
2026-05-07
Flesch-Kincaid & SMOG Readability Scorer Sentence-level highlights show exactly which lines drag your grade level down, all client-side with no account required.
2026-04-27
In Development Planned Release
Reading Time Calculator Paste any text and get reading time at adjustable WPM targets.
2026-10
Markdown Preview Live-render Markdown with clean typeset output and copy-as-HTML export.
2026-10
Audio & Acoustic Testing Tools Measure, sweep, and stress-test your audio hardware securely. Leverage the Web Audio API for precise, local microphone and speaker diagnostics in the browser.
Live Tools Last Update
Decibel & SPL Cross-Domain Calculator Convert between dB, watts, volts, and sound pressure level, with the underlying formula shown.
2026-05-08
Speaker Frequency Sweep & Resonance Tester Sweep 20 Hz – 20 kHz to find resonances, rattle points, and drop-off frequencies — 100% local.
2026-04-24
Microphone Quality, Noise & Latency Tester Noise floor, clipping, frequency response, echo loopback, and round-trip latency — 100% local.
2026-04-22
Math & Engineering Calculators Solve complex equations with free calculators for electronics, signal theory, and unit conversions. Get instant, local results without creating an account.
Live Tools Last Update
Aspect Ratio & Letterbox Calculator Resolve display resolutions and scaling for any ratio, with letterbox bar dimensions calculated automatically.
2026-05-07
Ohm's Law & Power Calculator Enter any two of voltage, current, resistance, or power, and solve for the rest instantly.
2026-05-07
Electrical Unit Converter Charge, current, voltage, resistance, capacitance, inductance, and more, converted with SI precision.
2026-05-02
Engineering Unit Converter SI, imperial, and domain-specific units spanning length, mass, temperature, pressure, energy, and more.
2026-05-02
Resistor Color Code Calculator 4-band, 5-band, and 6-band resistor decoding with tolerance, temperature coefficient, and E-series lookup.
2026-04-24
Security & Privacy Tools Hash files, encode credentials, and scrub metadata entirely client-side. Protect sensitive information with fast, reliable, privacy-first tools.
Live Tools Last Update
Password Entropy Analyser Shannon entropy, zxcvbn pattern analysis, and GPU crack-time estimates — 100% offline, nothing uploaded.
2026-06-09
URL Encoder / Decoder Percent-encode and decode URLs and query strings with component parsing.
2026-06-06
Cloud Config Sanitizer Validate Kubernetes, Terraform, and YAML manifests locally — detect secrets, security smells, and generate a sanitized safe version.
2026-05-19
X.509 Certificate Inspector Paste any PEM or DER certificate and inspect validity, SANs, key algorithm, chain depth, and expiry — client-side only.
2026-05-19
Offline OCR & Document Redactor Extract text and redact sensitive regions from documents — Tesseract WASM, 100% local, nothing uploaded.
2026-05-13
PII Scrubber Detect and tokenize PII, secrets, and internal data before sending prompts to AI — 100% local, nothing uploaded.
2026-05-08
Browser Fingerprint & Privacy Leak Inspector See exactly what your browser leaks — canvas hash, WebGL renderer, audio fingerprint, fonts, and 30+ signals. 100% local.
2026-05-04
EXIF & Image Metadata Scrubber Strip GPS, timestamps, and device data from images — 100% local, nothing uploaded.
2026-04-23
File Hash Verifier Compute SHA-256, SHA-512, SHA-1, and MD5 checksums for any file — compare against a published checksum.
2026-04-23
In Development Planned Release
Quantum-Safe Encryptor Encrypt and decrypt text with post-quantum cryptography (Kyber/Dilithium via WASM) — plaintext never leaves your browser.
2026-10
Build Integrity Verifier Verify reproducible builds by hashing two local artifacts with SHA-256 and BLAKE3, then deep-diffing functional content. Zero upload.
2026-10
Local Secret Scanner Scan code, configs, and ZIP archives for leaked API keys, tokens, and credentials — regex rule engine, zero upload, nothing sent anywhere.
2026-10
Web Design Utilities & CSS Tools Generate CSS, check contrast, and convert color palettes instantly. Streamline workflows with free, browser-native design tools.
Live Tools Last Update
WCAG Contrast Checker AA and AAA contrast ratio testing with hex, RGB, and HSL input.
2026-07-10
CSS Gradient Builder Visual linear and radial gradient editor with live CSS output.
2026-06-07
Color Format Converter Convert between HEX, RGB, HSL, HSV, OKLCH, and CSS named colours.
2026-05-01
Network & Web Reference Tools Inspect URLs, HTTP headers, and IP subnets instantly in your browser. Ensure data privacy with offline-capable network utilities requiring no account.
Live Tools Last Update
MIME Type Reference Searchable MIME database with extension mapping and RFC sources.
2026-05-31
IndexNow URL Submitter Submit URLs to Bing, Yandex, Naver, and more via IndexNow — paste direct URLs or sitemap URLs, batched and proxied.
2026-05-23
HTTP Status Code Reference Searchable reference for all HTTP 1xx–5xx codes with usage notes.
2026-05-20
P2P Network Tester Test WebRTC peer-to-peer latency, jitter, and packet loss between two browsers — STUN probe, live sparkline, zero cloud.
2026-05-13
IPv4 / IPv6 Subnet & CIDR Calculator Calculate network ranges, broadcast addresses, and host counts for IPv4 and IPv6 — all processed locally.
2026-05-06
URL Parser & Inspector Decompose any URL into protocol, host, path, params, and fragment.
2026-05-03