PromptSpend
The LLM price list that shows its sources
Every LLM cost calculator goes stale the moment a vendor reprices. PromptSpend re-checks its catalog every morning against vendor pages, flags disagreements instead of averaging over them, and shows the source URL and confirmation date on every number. Paste a real prompt or set your scale, compare up to four models side by side, and see the monthly cost — plus the two numbers every calculator gets wrong: compounding chat history and hidden reasoning tokens. Free, no account, open source.
Runs on the web, iPhone, iPad and Android, with a keyless API, an MCP server and a VS Code extension. Pasted text in the apps is counted on the device and never uploaded. Estimates use list prices; they are not bills.
Features
Prices re-checked against vendor pages every morning
Source URL and confirmation date on every price
Compare up to four models side by side
Counts compounding chat history and hidden reasoning tokens
Keyless pricing API, MCP server and VS Code extension
Use Cases
Estimate what an AI feature will cost before you build it
Compare models on your real prompt at your expected scale
Pull current, sourced LLM prices into your own tools via the API or MCP server
Comments
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