AI Developer Tools
Browser-based utilities for prompts, structured output, tokens and AI agent development.
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Token Counter
Estimate tokens and prompt size locally.
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Prompt Formatter
Turn rough instructions into a clearer prompt structure.
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JSONL Validator
Validate JSONL rows and locate broken lines.
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JSON Repair
Repair common malformed model JSON output.
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Prompt Template
Inspect {{variables}} in prompt templates.
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Context Splitter
Split large text into approximate token-sized chunks.
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Prompt Diff
Compare prompt versions line by line.
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AI Cost Calculator
Estimate model API cost from token counts and your rates.
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MCP Validator
Check MCP tool definitions for common structural issues.
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JSON Schema Generator
Infer a JSON Schema from sample data.
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Structured Output
Validate model JSON against a JSON Schema.
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PII Redactor
Mask common emails, phones and tokens before sharing prompts.
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RAG Chunker
Split documents into approximate retrieval chunks.