Free AI Tools
Battle-tested utilities for AI builders. No signup, no paywall â compare 130+ AI models, calculate costs, and pick the right one for your workload.
130+ models
Updated weekly
Open source data
New
LLM API Cost Calculator
Paste prompt volume, see exact monthly cost across all 130+ AI models. Shareable URL with state.
New
AI Model Quiz
Find the right model in 60 seconds. Answer 8 questions on use case, latency, budget, modality.
Coming soon
Comparison Matrix
Side-by-side filterable grid across 25+ dimensions: price, context, latency, MMLU, license.
Coming soon
AI Glossary
200+ terms explained: RAG, MoE, KV-cache, speculative decoding, LoRA, RLHF, function calling.
One API for every model in the list
After you pick the right model with our tools, swap providers in a single line. Railwail is OpenAI-compatible and connects to 130+ models.