AI Developer Tools
A small, focused set of tools for people building on AI APIs. Each tool solves one specific problem well, runs entirely in your browser, and never sends your data anywhere. Free forever.
Available now
The tool you can use today. More listed below are in development — every one will follow the same static-first, private-by-design approach.
Token Counter & Cost Calculator
Paste any text — instantly see token count and cost across every major AI provider. Includes prompt caching math and monthly cost projection.
- 11 models across Anthropic, OpenAI, Google, Bedrock, Azure
- Live provider comparison — sorted by monthly cost
- Prompt caching toggle with hit-rate slider
- Monthly cost projection based on your daily volume
In development
Currently being built and tested. Each fills a specific gap we've watched developers hit repeatedly and each will ship as pure client-side HTML/CSS/JS when ready.
AI Error Decoder
Paste any raw AI API error — response body, exception message, stack trace — and get instant matches from our library of 390 documented errors with fixes.
- Matches against every error in the AI Error Hub database
- Fuzzy matching handles variant error strings across providers
- Ranked results with confidence + one-click to full fix page
- Works entirely in your browser — no error data sent anywhere
Model Comparison Grid
Every model from every major provider in one filterable grid — context window, prices, features, and "best for" recommendations side by side.
- Filter by provider, price tier, context window, capability
- Sort by any column — cost, context, latency, release date
- Includes reasoning modes, extended thinking, structured outputs
- Bookmarkable filter states via URL params
Why static-first tools?
Most AI utilities on the web today make you paste your data — sometimes proprietary prompts, sometimes real customer messages, sometimes API keys — into a text box that then POSTs it to someone else's server for processing. That's a category of data leak most teams don't fully appreciate until they audit it.
Our tools do the same work in your browser. The pricing tables, the tokenizer heuristics, the error index — all bundled into the HTML you download when the page loads. Your input never touches our infrastructure. There's no backend to breach, no logs to accidentally retain, no telemetry to opt out of.
Related reading: AI Security Playbook covers the broader data-leak surface area of the tools your team uses daily.
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No data leaves your browser
Every calculation, lookup, and comparison happens client-side. There's no server to send data to — even by accident.
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No signups, no gates
Every tool works immediately without an account, email, or paywall. If it stops being free, that's a broken promise.
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Works offline after first load
Once the page loads, disconnect the internet — the tools keep working. That's what "static" means in practice.
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Transparent about approximations
Token counts are estimates. Costs use published rates. Every assumption is documented on the tool's own page.
Missing a tool?
We're actively building. If there's a specific AI developer utility you'd use regularly and it doesn't exist elsewhere in a browser-friendly form, tell us what it is.