Best API cost management AI tools

A free, online tool for developers and prompt engineers to accurately count tokens for various OpenAI models like GPT-4o, GPT-4, and GPT-3.5. It helps manage prompt length to stay within model limits, control API costs, and optimize interactions with LLMs. The tool operates entirely in your browser, ensuring your prompts remain private and are never transmitted over the internet.

Quartzite is an advanced AI prompt IDE and productivity tool that centralizes access to top LLMs like GPT-4, Claude, and Gemini. It helps users write, optimize, and manage complex prompts with features like a template library, version history, cost preview, and a personal document knowledge base, all while reducing API costs.