Estimate token counts, context caching, and exact pricing across GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, and DeepSeek R1.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Paste your prompt or system instructions into the text area.
Adjust expected output tokens, monthly call volume, and prompt cache hit percentage.
Compare the per-call and monthly cost matrix across all major LLM providers.
The tool utilizes a tuned BPE byte-pair heuristic approximating standard cl100k_base tokenization across English text and code.
No. All text parsing, character counting, and mathematical projections run 100% locally in your browser.
Zero-egress companion tools in the AI Utilities suite
Calculate API inference cost given prompt and completion token counts.
Structure complex prompts using Claude-compliant XML encapsulation tags.
Design sequential multi-step prompt chains (Extraction -> Verification -> Summarization).
Generate systematic Prompt Eval test case matrices in JSON format for automated benchmark suites.
