Also from this team
QR code generator and scanner
Create, scan and fix QR codes. Runs entirely in your browser.
Free developer tools for AI and LLM work.
Count tokens and estimate API costs, build and validate JSON Schemas, compare prompts, check MCP configs, tune RAG chunking and scan for leaked keys. Everything runs in your browser — no account, no upload, no interruption.
- 16 tools
- 0 accounts
- 0 uploads
All tools
AI & LLM
- Token & Cost CalculatorEstimate token usage and monthly API costs.
- JSON Schema BuilderBuild a schema visually and export it as a tool definition.
- Structured Output ValidatorCheck model output against a schema, with the path that broke.
- Prompt DiffSee which instructions changed, and what the change costs.
- MCP Config ValidatorCatch the mistakes that break an MCP config in practice.
- RAG Chunking PlaygroundSee the chunks your settings actually produce, before you index.
- Embedding Cost EstimatorWork out what embedding a corpus costs before you index it.
- Multi-model Cost ComparisonPrice one workload across several models, side by side.
Generators
JSON
Start from the question instead
If you have a problem rather than a tool in mind, the 22 task guides answer a specific question each — counting tokens, reading a schema validation failure, what belongs in an instruction file, what to do about a committed key — with the tool that answers it built into the page.