536 free developer tools. No signup, no data sent to servers.
Results load from the API as you filter. Press Enter to search immediately.
536 tools
Count tokens for LLM prompts across OpenAI-family models.
Calculate LLM API costs for prompts and completions.
Calculate embedding API costs for your text.
Estimate vector database storage requirements.
Repair malformed JSON from LLM outputs.
Validate LLM tool-call schemas against JSON Schema.
Visualize text chunking strategies for RAG pipelines.
Validate JSONL files for LLM fine-tuning.
Generate MCP server configuration JSON.
Validate MCP server manifest files.
Detect and remove invisible Unicode characters.
Generate CSS view-transition styles.
Generate CSS scroll-driven animations.
Generate CSS for custom <select> styling.
Generate CSS Grid template declarations.
Convert flat CSS to nested CSS and vice versa.
Generate CSS anchor positioning rules.
Convert between OKLCH, OKLab, sRGB, and display-P3.
Generate contrast-color() CSS declarations.
Generate responsive srcset attributes for images.
Generate speculation rules JSON for speculative loading.
Check Baseline status of web platform features.
Calculate performance budgets for web assets.
Check text contrast using the APCA algorithm.
Showing 24 of 536 tools
All 536 tools run entirely in your browser. Your data never leaves your device, ensuring complete privacy and security for sensitive information.
536 free developer tools. No signup, no data sent to servers.
Results load from the API as you filter. Press Enter to search immediately.
536 tools
Count tokens for LLM prompts across OpenAI-family models.
Calculate LLM API costs for prompts and completions.
Calculate embedding API costs for your text.
Estimate vector database storage requirements.
Repair malformed JSON from LLM outputs.
Validate LLM tool-call schemas against JSON Schema.
Visualize text chunking strategies for RAG pipelines.
Validate JSONL files for LLM fine-tuning.
Generate MCP server configuration JSON.
Validate MCP server manifest files.
Detect and remove invisible Unicode characters.
Generate CSS view-transition styles.
Generate CSS scroll-driven animations.
Generate CSS for custom <select> styling.
Generate CSS Grid template declarations.
Convert flat CSS to nested CSS and vice versa.
Generate CSS anchor positioning rules.
Convert between OKLCH, OKLab, sRGB, and display-P3.
Generate contrast-color() CSS declarations.
Generate responsive srcset attributes for images.
Generate speculation rules JSON for speculative loading.
Check Baseline status of web platform features.
Calculate performance budgets for web assets.
Check text contrast using the APCA algorithm.
Showing 24 of 536 tools
All 536 tools run entirely in your browser. Your data never leaves your device, ensuring complete privacy and security for sensitive information.