Free online tools
Fast, offline-first client-side web tools for local AI engineers, cryptographic auditors, and identity developers.
🧩 Sensory & Regulation — for neurodivergent minds
Free, no-signup, local-first tools for autistic and neurodivergent people. Research-cited, honest about limits — and your data (mic audio, check-ins, history) never leaves your device. Every tool has one-click export and delete.
Sound Level Meter
Live loudness + the frequency bands research links to auditory overload (250 Hz and 8 kHz). Mic audio never leaves the page.
Noise Mask (white / pink / brown)
Free, offline noise generation with an honest tolerance check — masking helps many sound-sensitive people, not everyone.
Sensory Overload Meter
Noise, light, crowds, task and masking in one visible number — and it learns your personal overload threshold. Local-only history with export/delete.
Breathing Pacer
Visual coherent (~5.5s), box and 4-7-8 patterns with a reduced-motion fallback. No sound required, no streaks, no notifications.
Stress Check-In
Six concrete questions turn vague stress into a visible gauge, then suggest YOUR own coping list. SAM-mechanism, RCT-cited. Never prompts you.
Recovery Mode
A deliberately near-empty page for meltdowns, shutdowns and overload: dim, monochrome, one line at a time, safe stops always allowed.
🧠 Cognitive & Personality Assessments
Big Five Personality Test (Quick, 50-Item)
A scientific, trait-level OCEAN profile from 50 public-domain IPIP items with normative percentiles. No signup — answers are collected in your browser, scored server-side, nothing stored. Not the MBTI® — the academic-consensus Big Five.
Big Five Personality Test (Deep, 120-Item)
A research-grade OCEAN profile across all 30 facets (6 per trait) from 120 public-domain IPIP-NEO items (Johnson, 2014). Local save-progress; answers scored server-side, nothing stored. Not the MBTI®.
Jungian 16-Type Indicator
A four-letter cognitive-type result (INTJ–ESFP) from self-authored Jungian items — the popular "type" lens, served legally. Not the MBTI® assessment (MBTI is a trademark of The Myers-Briggs Company). For self-reflection.
🤖 Local AI, LLMs & Hardware Utilities
Local LLM & ComfyUI VRAM Calculator
Calculate exact GPU memory requirements for Ollama, llama.cpp, vLLM, and Stable Diffusion across model sizes (3B to 405B), quantization presets (`Q4_K_M`, `Q8_0`, `FP16`), and context lengths.
Local LLM Prompt & ChatML Builder
Format system prompts, user turns, and assistant outputs into valid ChatML ChatML. Chat Markup Language — a text format for structuring multi-turn prompts sent to chat models. , Llama-3, and DeepSeek templates 100% in-browser.
Offline BPE Token Counter & Context Visualizer
Calculate exact BPE token counts, inspect sub-word token fragmentation, and monitor context-window percentage usage offline.
MemScope Memory Compression & VRAM Tracker
Portable Windows executable that surfaces hidden Windows Memory Compression pressure, tracks 64-bit DXGI VRAM VRAM. Video RAM — the memory on your graphics card, used by games and AI models; a scarce resource when running local AI. allocations per process, and auto-flushes memory on OOM risk.
🔑 Cryptography & Verifiable Identity Tools
SD-JWT & Verifiable Credential Inspector
Decode, inspect claims, and analyze selective disclosure digests (`~sd`) in SD-JWT SD-JWT. Selective-Disclosure JWT — a format that lets a holder reveal only the fields needed (e.g. prove you're over 18 without showing your birthdate). (RFC 9901) and W3C VC tokens offline in your browser.
Mneurix Verifiers, Converters & Diagnostic Suite
Access the complete suite of client-side verifiers: Key Binding Verifier, JWK ↔ PEM Converter, Bitstring Status List Decoder, and Open Badges 3.0 Schema Verifier.
🛠️ Data Transformers & Security Utilities
Multi-Format Data Converter
Convert configuration files and structured payloads between JSON, YAML, TOML, and CSV 100% client-side with zero data transmission.
Hash, Checksum & HMAC Generator
Compute SHA-256, SHA-512, and HMAC cryptographic hashes across text strings or uploaded files 100% in your browser.
In-Browser SQL & CSV Query Sandbox
Execute complex SQL queries, JOINs, and aggregations on CSV datasets using an in-memory WASM WASM. WebAssembly — a fast, safe format for running near-native-speed code inside a browser (used for in-browser SQL, image processing, etc.). SQL database engine 100% locally.
Private Voice Note & Speech Transcriber
Record voice notes or process audio buffers to generate timestamped text transcripts and `.srt` subtitle files 100% offline.
Live Mermaid Diagram & Architecture Studio
Render interactive architecture flowcharts, sequence diagrams, and class diagrams in real time with high-res SVG export.
📦 Open-Source Libraries, WASM Engines & W3C Standards
100% Offline Client-Side ExecutionAll Mneurix in-browser developer utilities are built using industry-standard open-source packages and W3C Web APIs:
- Mermaid.js (MIT License) — Live client-side diagram & flowchart rendering
- @sqlite.org/sqlite-wasm (public domain, sqlite.org) — the official WebAssembly SQLite build for the SQL sandbox
- W3C Web Speech & WebAudio APIs — Private in-memory microphone speech transcription
- W3C WebCrypto API (
crypto.subtle) — Hardware-accelerated client-side hashing - tiktoken & js-yaml (MIT License) — BPE tokenization & multi-format data parsing
⚖️ Legal Notice & Disclaimer: All tools in the Mneurix Developer Directory are provided "as is", without warranty of any kind, express or implied, including but not limited to warranties of accuracy, merchantability, or fitness for a particular purpose. Mind and developer tools process data 100% locally inside your browser memory. The one exception: personality-test answers are sent once to our scoring endpoint to compute your results, and nothing is collected, logged, or stored there.