Free AI Tools for Developers & Prompt Engineers
Token calculators, prompt optimizers, and AI utilities — no sign-up required. Precision engineered for the latent space.
Token Counter by Model
Instantly calculate exact token usage for GPT-4, Claude 3, and Llama 3 models using native tokenizers.
Model Comparison Calculator
Compare costs and context window efficiency across multiple LLM providers side-by-side.
Tokens-per-Dollar Calculator
Economic analysis of your prompts. Find out exactly how many words your budget gets you.
Tokens-to-Words Converter
Convert token counts into human-readable word counts based on model-specific distributions.
Context Window Visualizer
Map your long-form prompts against the context limits of major models to avoid truncation.
No sign-up needed
Start using any tool immediately. We don't gate functionality behind registration forms.
Built for developers
API-first mindset with tools that respect technical accuracy and low-latency performance.
Always free core tools
Our essential toolkit will always remain free. No hidden fees for standard prompt engineering.