About Rocket Dev Tools

A single home for 139+ small, repetitive tools developers reach for constantly — cloud sizing math, format conversions, encoding, cryptographic key generation, AI token estimation, and image processing — built around one uncompromising rule: nothing you type, paste, or drop is ever sent anywhere.

Why this exists

Most "free online tools" — JSON formatters, JWT decoders, hash generators, image compressors — work by uploading whatever you paste or drop to a server, processing it remotely, and sending back a result. That requires an unnecessary amount of trust, especially when developers frequently inspect sensitive information: API keys, authentication tokens, internal architecture configs, confidential documents, and customer data samples.

Rocket Dev Tools eliminates that tradeoff completely. Every calculator and utility here runs as client-side JavaScript or WebAssembly directly in your browser engine. Computation happens strictly on your device, and there is no backend server for your data to travel to in the first place.

What's here

Four core suites sharing a unified client-side architecture:

  • Architecture Suite (38 tools): Cloud capacity sizing, database limits (Postgres, Redis, Mongo, Cassandra, DynamoDB), streaming throughput (Kafka, Kinesis, RabbitMQ, SQS), serverless tuning, networking costs, and an interactive Architecture Canvas with real-time multi-cloud cost modeling.
  • Developer Utilities (67 tools): Everyday formatters, encoders, parsers, and generators — regex tester, diff checker, JSON/YAML/CSV tools, SQL-to-ORM converters, JWT decoder/generator, OAuth PKCE, HAR waterfall analyzer, security header auditors, and CSS design studios.
  • AI & LLM Tools (22 tools): Token counting across model families, BPE tokenizer heatmaps, prompt differ & compressor, few-shot builders, JSON schema mock generators, vector database & RAG sizers, PII secret redactor, and AI SaaS unit economics calculators.
  • Image Tools (12 tools): In-browser image compressor, multi-format converter (JPEG, PNG, WebP), batch converter, SVG to PNG renderer, favicon generator, social banner asset pack generator, EXIF metadata stripper, and privacy pixelator/redactor — all powered by the HTML5 Canvas API without server uploads.

How it's built

This is an independently built and maintained static web application — no user accounts, no database, no server-side APIs, and zero analytics or tracking telemetry. All libraries are bundled ahead of time and execute locally in your browser sandbox.

Any preferences or workspace state you customize — such as your light/dark theme preference, starred tool favorites, recent tools, local architecture canvas drafts, or custom pricing overrides — are stored strictly within your browser's localStorage. That state never leaves your device.

Accuracy and limits

Cost and sizing calculators are modeled from published cloud provider pricing specifications (AWS, GCP, Azure, Cloudflare) and established mathematical capacity formulas. They are designed for architecture planning, capacity sizing, and cost forecasting, not exact billing invoices. Cloud pricing changes over time; always confirm active rates with your provider before making binding budgetary commitments.

Token counts and LLM cost estimators approximate real tokenizer behavior across OpenAI, Anthropic, Google, and open-source models. Where specific tools have technical limitations or browser constraints, clear notices and parameter explanations are provided on that tool's page.

Questions or feedback

Found a bug, have a tool request, or want to suggest an improvement? Check out the Contact page or consult our FAQ for common questions and answers.