Rocket Dev Tools is a free collection of over 130 browser-based utilities for developers, covering cloud architecture sizing, AI/LLM engineering, everyday converters, and image processing. All tools execute entirely client-side via WebAssembly and Web Crypto, meaning no input data is ever uploaded to a server. The site is a static HTML/JS deployment with zero telemetry, and it works offline after loading.
What is Rocket Dev Tools?
Rocket Dev Tools is a suite of 130+ developer utilities that run entirely in the browser. It includes 37 architecture calculators, 22 AI/LLM tools, 59 developer utilities, and 12 image tools. You input data like JWT tokens, SQL schemas, or cloud resource requirements, and the tools output decoded data, sizing recommendations, or generated assets. The platform runs on any modern web browser and is built as a static site with no backend, so all processing stays on your device.
Key Features
- Zero-Telemetry Architecture — Every calculation happens in your browser; the Network tab shows 0 bytes uploaded. No backend servers or remote databases ever receive your sensitive data.
- Architecture Suite (37 tools) — Includes cloud sizing calculators for Kafka partitions, Kubernetes bin-packing, Redis memory, Postgres zero-downtime migrations, and Vercel vs CloudFront cost compare, plus a drag-and-drop architecture canvas with live multi-cloud cost estimates.
- AI & LLM Tools (22 tools) — Token counter with BPE heatmap for GPT-4o, Claude 3.5, and Gemini 1.5; system prompt builder with XML boundaries; vector DB sizer supporting HNSW/IVF and SQ8; PII and secret redactor; tool schema to OpenAPI 3.1 converter; and an AI SaaS margin calculator.
- Developer Utilities (59 tools) — JWT decoder, regex tester with dialect explanations, Unix epoch converter, SQL to ORM (Prisma/Drizzle/TypeScript) converter, Tailwind v3 to v4 migration converter, and Hash/HMAC generator using Web Crypto.
- Image & Media Tools (12 tools) — Image compressor for JPEG/PNG/WebP, SVG to PNG/WebP renderer with 1x-4x density, cropper with OpenGraph presets (1200×630), favicon generator (ICO + Apple touch icon + manifest icons), color palette extractor, and social/App asset pack generator that outputs a ZIP.
- Offline & Enterprise Safe — Once loaded, all tools work without internet, making it suitable for air-gapped environments and safe for inspecting internal JWT tokens, PII, and proprietary SQL schemas.
Who is it for?
- Cloud and DevOps engineers — Use the Architecture Suite to size Kafka clusters, plan zero-downtime Postgres migrations, and compare Vercel vs CloudFront costs.
- AI/LLM practitioners — Count tokens and estimate costs across leading models, build structured prompts, size vector DBs, and redact PII before sending data to LLM APIs.
- Backend and frontend developers — Convert SQL schemas to ORM definitions, test regex, decode JWTs, migrate Tailwind themes, and generate favicons or social sharing images without leaving the browser.
What can you do with Rocket Dev Tools?
- Sizing and capacity planning: Calculate optimal Kafka partition counts, Kubernetes node pool density, Redis RAM with eviction policies, and Postgres migration lock risk.
- AI cost and token management: Get real-time token counts and cost breakdowns for GPT-4o, Claude 3.5, and Gemini 1.5, and compute per-user token costs for AI SaaS pricing tiers.
- Data privacy and schema work: Scrub API keys, emails, credit cards, and JWTs locally before calling LLMs, or convert a tool schema to OpenAPI 3.1 for API documentation.
- Image and asset generation: Compress and resize images locally, render SVG to high-res PNG/WebP, and generate complete favicon sets or social asset packs as ZIP bundles.
How does Rocket Dev Tools work?
Rocket Dev Tools is a static website with no backend. You open a tool, paste or upload your input, and all processing happens in your browser using WebAssembly and Web Crypto. Because the code runs entirely client-side, there is no network request to a server, and the tools remain operational offline once the page is loaded.
Pricing
Rocket Dev Tools is completely free. There is no sign-up, no paywalls, and no usage limits. All calculators and utilities are available without cost, and the site does not use cookies, or telemetry.
FAQ
Is Rocket Dev Tools really free?
Yes — every calculator and utility on the site is 100% free with no sign-up, no paywalls, and no usage limits. All computation happens locally in your browser.
Do you store or see the data I paste into these tools?
Never. Every tool runs purely as client-side JavaScript; there is no backend server receiving your input. Whatever you paste into the JWT decoder, PII redactor, or JSON formatter stays on your device.
Can I use these tools offline?
Yes. Once a page is loaded, all tool computations execute entirely within your browser engine and do not require network connectivity. This makes Rocket Dev Tools usable in air-gapped or offline environments.
How accurate are the cloud architecture calculators?
The calculators are modeled on official cloud provider pricing, memory formulas, and capacity specifications from AWS, GCP, Cloudflare, Kubernetes, and others, so they provide realistic sizing and cost planning.
Does Rocket Dev Tools use cookies or trackers?
No third-party trackers, or telemetry cookies are used. The only data saved locally on your device is your light/dark theme preference and starred favorites.
