LLM Toolkit Free · No sign-up · 100% in-browser
AI tools you can trust, priced data you can verify.
Token counters, LLM pricing comparisons, context window charts and API cost calculators for developers building with GPT, Claude and Gemini. Every tool runs entirely in your browser — no data ever leaves your machine.
All tools
AI Token Counter
LiveCount tokens for GPT-5, Claude, Gemini and more — with live cost estimates and context window usage. Everything runs locally in your browser.
LLM Pricing Comparison
LiveSide-by-side API pricing for every major model — input, output, cached input and context — each row dated to its last verification.
Context Window Comparison
LiveCompare context window sizes across all major LLMs, visualized. Find the model that actually fits your document.
LLM API Cost Calculator
LiveEstimate your real monthly API spend by request volume, input/output ratio and caching — then compare models on total cost.
Token ↔ Words Converter
LiveConvert between tokens and words instantly: 1,000 tokens ≈ 750 words. Reference table from 100 to 1M tokens with pages and context fit.
Popular comparisons
All 16 comparisons →GPT-5 vs Claude Opus 5
Pricing, context and real-workload costs
GPT-5 mini vs Claude Sonnet 5
Pricing, context and real-workload costs
GPT-5 nano vs Claude Haiku 4.5
Pricing, context and real-workload costs
GPT-5 vs Gemini 3.5 Flash
Pricing, context and real-workload costs
Gemini 3.5 Flash vs GPT-5 mini
Pricing, context and real-workload costs
Gemini 3.5 Flash vs Claude Sonnet 5
Pricing, context and real-workload costs
How our pricing data stays honest
Every model row carries a lastChecked date and its source. We re-verify prices against official provider pages on a fixed schedule, and rows pending re-verification are marked as such. Currently tracking 12 models — 11 verified against official pages as of 2026-08-25.