Free Developer Tools

A growing set of no-signup tools for engineers and engineering managers — calculators, JWT/cron/SQL/Docker utilities and more. Built and maintained by the WeWorkWorldwide engineering team.

Engineering Economics

Nearshore & Offshore Dev Cost Calculator Compare what a software team really costs across the US, Western Europe, Romania and Pakistan. Open tool →
Cost of a Meeting Calculator Put a dollar figure on that recurring standup, planning session or "quick sync". Open tool →
Tech Debt & Refactor ROI Calculator Turn "the code is slowing us down" into a payback period leadership will fund. Open tool →
What Is Your Codebase Worth? Estimate the rebuild cost of any public GitHub repo with the COCOMO model. Open tool →
GitHub Repo Health Checker README, license, CI, last commit, bus factor — graded out of 100 for any public repo. Open tool →

Web & Security

JWT Decoder & Debugger Decode and inspect a JSON Web Token. Header, payload, claims, expiry — in your browser. Open tool →
HTTP Security Headers Generator & Analyzer Generate a hardened header set, or paste yours and get a graded report. Open tool →
Hash Generator (MD5, SHA, HMAC) Hash text or files with MD5, SHA-1/256/384/512 and HMAC variants — live in your browser. Open tool →
Base64, URL & HTML Entity Encoder/Decoder Three encoders, one keyboard shortcut. Includes Base64URL (the JWT one). Open tool →
JWT Signer (HS256 / HS384 / HS512) Build and sign a JWT with an HMAC secret — all in your browser. Open tool →
TLS / SSL Certificate Decoder Paste a PEM, see subject, issuer, validity, SANs, key info and extensions. Open tool →
Password Strength & Crack-Time Estimator Score a password and see how long an offline attacker would need. Open tool →
bcrypt Cost & Hash Time Calculator Pick a bcrypt cost factor with eyes open — see how long it takes on real hardware. Open tool →

DevOps & Infra

Cron Expression Generator & Explainer Build a crontab schedule from plain controls and read it back in plain English. Open tool →
Dockerfile Linter & Optimizer Catch cache-busting, bloat and footguns in your Dockerfile before they hit CI. Open tool →
DNS Lookup Tool Resolve A, AAAA, MX, TXT, NS, CNAME, CAA and more over DNS-over-HTTPS. Open tool →
CIDR & Subnet Calculator Network, broadcast, host range, mask and binary view for any IPv4 CIDR. Open tool →
HTTP Request / curl Command Builder Compose a request visually, copy the curl — or fetch — one-liner. Open tool →
HTTP Status Code Reference Every status code, what it means in practice, and when you actually return it. Open tool →
.gitignore Generator Compose a clean .gitignore from language, framework and OS templates. Open tool →

Data & Backend

SQL Formatter & Analyzer Pretty-print messy SQL and surface obvious performance smells. Open tool →
Regex Tester & Explainer Test a pattern, see every match, and get a plain-English breakdown token by token. Open tool →
JSON Formatter, Validator & Tree View Pretty-print, minify, validate, and explore JSON with a collapsible tree view. Open tool →
JSON ↔ YAML ↔ TOML Converter Round-trip between the three config formats your stack inevitably mixes. Open tool →
Mock Data Generator Fake users, emails, addresses and IDs — in JSON, CSV or SQL, ready to seed. Open tool →
Number Base Converter Decimal, binary, octal and hex side by side, live as you type. Open tool →
Color Converter & Picker HEX, RGB, HSL, OKLCH and P3 — live, with contrast checks against any background. Open tool →

Developer Productivity

Git "Oh No" Command Finder Describe the mess you just made in git. Get the exact recovery command. Open tool →
Standup Excuse Generator Out of plausible reasons the ticket is still in progress? We got you. Open tool →
Distributed Team Meeting-Time Finder Find the hours where New York, London, Bucharest and Karachi all overlap — or any cities you pick. Open tool →
UUID & ULID Generator v1, v4, v7 and ULID — with notes on when each one is actually the right call. Open tool →
Markdown Live Preview Side-by-side Markdown editor with GitHub-flavored rendering and syntax-highlighted code. Open tool →
Unix Timestamp Converter Epoch ↔ human dates in any timezone, with ISO 8601, RFC 3339 and SQL outputs. Open tool →
README Badge Generator Compose shields.io badges — build, license, version, coverage — without remembering URLs. Open tool →
Conventional Commits + Gitmoji Helper Compose a properly-formatted commit message, with breaking-change footers if needed. Open tool →
Semantic Version Calculator Bump major/minor/patch, simplify version ranges, and check if a version satisfies a range. Open tool →
Lorem Ipsum — Tech Variant Plausibly-engineering filler text for mockups, prototypes and screenshots. Open tool →

Engineering Management

DORA Metrics Calculator Deployment frequency, lead time, change failure rate, MTTR — with the elite/high/medium/low band. Open tool →
A/B Test Sample Size & Significance Calculator How many users do you need? Is the lift you saw real? Open tool →
Sprint Velocity & Story-Point Calibration Track velocity, smooth noise, and forecast a delivery date with honest uncertainty. Open tool →
Postmortem / Incident Template Generator Generate a blameless postmortem skeleton in Markdown, ready to paste into the doc. Open tool →
RFC / ADR Template Generator Architecture Decision Record or design RFC, in clean Markdown, in seconds. Open tool →

AI & LLM Tools

AI Prompt Cost Calculator What does this prompt cost at 10K, 100K, 10M calls a day — on Claude, GPT, Gemini or open models? Open tool →
AI Model Spec Comparator Side-by-side: context window, price, vision, tool use, structured output, latency. Open tool →
llms.txt Generator & Validator The AI-era robots.txt. Tell language models which content to use and what to skip. Open tool →
AI Token Counter Paste text, see token counts for the major tokenisers (Claude, GPT, Gemini, Llama). Open tool →
File → Markdown Converter Drop a Word doc, ODT, HTML, EPUB, LaTeX or Jupyter notebook — get clean Markdown ready to feed an LLM. Open tool →
Free forever · No signup

Need this for real, on your stack?

These free tools are a taste of how we think. We’re a senior software team across Romania & Pakistan that ships deep technical work — platforms, infra, data and the gnarly bits in between.

Talk to our engineers →