Developer tools that never leave your browser.
Free cloud cost calculators, distributed system design math, and AI/LLM engineering utilities. Everything executes entirely in your browser engine with zero telemetry.
🏗️ Architecture Suite
38 cloud architecture sizing, database capacity, and distributed systems calculators
Drag-and-drop cloud architecture diagrams with live multi-cloud cost estimates.
Analyze table lock risk and generate safe zero-downtime PostgreSQL migrations.
Calculate optimal partition counts, consumer concurrency, and broker throughput.
Compute node pool packing, pod density, CPU/RAM overhead, and cluster cost.
RAM sizing, eviction policy planning, data structure overhead, and sharding.
Compare edge compute vs CDN caching costs and evaluate bandwidth break-even pricing.
🤖 AI & LLM Tools
22 prompt engineering, token math, embedding sizers, and LLM production utilities
Real-time token counts, cost breakdown across GPT-4o, Claude 3.5, and Gemini 1.5.
Structured system prompt composer with XML boundaries, guardrails, and templating.
Dimension math, HNSW/IVF indexing RAM, and scalar quantization (SQ8) for vector DBs.
Scrub API keys, emails, credit cards, JWTs, and credentials locally before calling LLMs.
Convert OpenAI/Anthropic function calling schemas to valid OpenAPI 3.1 specifications.
Model per-user token cost, monthly subscription pricing, gross margins, and tier economics.
🛠️ Developer Utilities
67 formatters, cryptographic tools, converters, network utilities, and CSS studios
Decode, inspect header/payload claims, and validate expiration times client-side.
Live regex matching with regex dialect explanations, syntax highlighting, and cheat sheets.
Convert epoch timestamps to human dates, timezones, ISO 8601, and relative offsets.
Convert SQL CREATE TABLE schemas to Prisma, Drizzle, and TypeScript definitions.
Migrate Tailwind configuration, colors, and font definitions between v3 and v4 CSS themes.
Compute SHA-256, SHA-512, MD5, and HMAC signatures in your browser with Web Crypto.
🖼️ Image & Media Tools
12 compression, format conversion, batch processing, and favicon generation
Compress and resize JPEG, PNG, and WebP images locally with custom quality and max dimensions.
Render SVG code or files to high-res PNG and WebP with 1x-4x density multipliers.
Crop images with presets for OpenGraph (1200×630), Twitter headers, and 16:9 widescreen.
Generate complete OpenGraph banners, Apple touch icons, and PWA assets in a ZIP bundle.
Extract dominant color palettes and export Tailwind CSS colors and CSS variables from images.
Generate complete favicon .ico, Apple touch icon, and manifest icon sets locally.
Zero-Telemetry Architecture Guarantee
Inspect Network tab in DevTools — 0 bytes uploaded to any server, ever.
Frequently Asked Questions
Everything you need to know about our client-side developer suite.
Yes — every calculator and utility on this site is 100% free with no sign-up, no paywalls, and no usage limits. Everything is computed right in your browser.
Never. Every tool runs purely as client-side JavaScript in your browser — there is no backend server receiving your input. Whatever you paste into the JWT decoder, PII redactor, or JSON formatter stays on your device.
Yes. Once the page is loaded, all tool computations execute entirely within your browser engine without requiring network connectivity.
Calculators are modeled on official cloud provider pricing models, memory formulas, and capacity specifications (AWS, GCP, Cloudflare, Kubernetes, etc.) for realistic sizing and cost planning.
No third-party trackers, ad scripts, or telemetry cookies. The only data saved locally on your device is your light/dark theme preference and starred favorites.
Yes! Tool requests and feedback are welcome via our Contact page or GitHub repository.