Practical calculators and utilities that solve annoying problems – for AI, hardware, networking, development, and security. No sign-up, no tracking, no data leaves your browser. Every tool links to a related guide so you can learn while you compute.
🤖 AI
LLM Playground
Chat with multiple AI models – adjust temperature, top-p, max tokens, and system prompt. Streams replies, shareable conversations.
Open playground →Benchmark Explorer
Browse and compare LLM benchmarks across GPUs, models, and backends – filter, sort by tok/s, see tested results.
Open explorer →Model Comparison Wizard
Compare models, quants, and GPUs side-by-side – VRAM, tok/s, and fit verdicts in one view.
Open wizard →VRAM Budget Planner
Visual bar chart of weights, KV cache, and overhead – pick a GPU, model, and context to see if it fits.
Open planner →Prompt Library & Editor
Browse prompt templates with {{variable}} slots, test them against the AI backend, and save your own.
Open library →RAG: Ask Your File
Upload a text file and ask questions about it. Client-side chunking + scoring, AI answers with cited context.
Open RAG →LLM VRAM Calculator
How much GPU memory a model needs at your quantization and context – weights, KV cache, and a verdict.
Open calculator →GPU AI Performance Calculator
Estimate tokens/sec and time to first token for running an LLM on a specific GPU.
Open calculator →Context Length & Memory Calculator
How much VRAM different context windows use – at q8, q4, and f16 KV cache.
Open calculator →GGUF Size Calculator
Estimate file size at every quantization (Q2–Q8) before you download a model.
Open calculator →AI API Cost Calculator
Compare cloud API pricing vs the electricity cost of running locally.
Open calculator →🖥️ Hardware
PC Power Supply Calculator
Peak power draw for your build and a recommended PSU wattage with safe headroom.
Open calculator →chmod Calculator
Toggle read/write/execute and get the numeric mode (755) and the command to run.
Open calculator →Cron Generator
Pick a schedule in plain English and get the cron expression plus next run times.
Open generator →🌐 Networking
CIDR / Subnet Calculator
Network address, usable host range, broadcast, and masks from an IP and prefix.
Open calculator →URL Encoder / Decoder
Percent-encode and decode URL components with UTF-8 support.
Open tool →👨💻 Developer
JSON Formatter & Validator
Format, minify, and validate JSON with syntax highlighting and size info.
Open tool →Regex Tester
Test regular expressions live with inline match highlighting and capture groups.
Open tool →JWT Decoder
Decode and inspect a JSON Web Token – header, payload, claims, and expiration.
Open tool →Base64 Encoder / Decoder
Convert text to and from base64 with proper UTF-8 support.
Open tool →Timestamp Converter
Convert Unix timestamps (seconds or ms) to dates and back, with relative time.
Open tool →Color Converter
Convert between HEX, RGB, and HSL with a live swatch and copy-ready CSS values.
Open tool →Text Diff Checker
Compare two versions of text with added and removed lines highlighted.
Open tool →Text Case Converter
Uppercase, lowercase, Title Case, sentence case, and camelCase – all at once.
Open tool →CSV ↔ JSON Converter
Paste CSV and get JSON, or paste a JSON array and get CSV back.
Open tool →UUID Generator
Generate UUID v4 and v7 identifiers – one or many, ready to copy.
Open generator →Docker Compose Generator
Pick an image, ports, volumes, and env vars to get a copy-paste ready docker-compose.yml.
Open generator →FFmpeg Command Generator
Build a correct ffmpeg command for converting, compressing, and trimming media.
Open generator →Config Generator Studio
Generate Docker Compose, systemd service units, and llama-server commands with a live YAML preview.
Open studio →PDF to Image Converter Free • Pro 3×/WebP
Convert PDF pages to PNG, JPEG, or WebP — 100% in-browser, private, no upload, up to 100MB. Free: PNG/JPG up to 2×. Pro: 3× & WebP.
Open tool →Markdown Notes
Private Markdown notes that stay in your browser – write, preview, search, and copy.
Open notes →Bookmarks & Reading List
Save, tag, search, and import URLs – your reading list, right in the browser.
Open bookmarks →RSS Aggregator
Read your favorite RSS and Atom feeds in one place – add any feed URL, browse the latest posts.
Open aggregator →🔐 Security
Password Generator
Strong random passwords with adjustable length, uppercase, lowercase, numbers, and symbols.
Open generator →Password Strength Checker
Entropy, estimated crack time, and what's dragging your password down.
Open tool →Random Secret Generator
Secure tokens for API keys, salts, and sessions with a chosen length and character set.
Open generator →Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 checksums of any text instantly.
Open tool →Why tools?
Articles give you the reasoning; tools give you the number for your exact setup. Each calculator links back to related guides, so you can read up before you buy or build – and the benchmark database shows the real-world numbers.