PromptSpend
The LLM price list that shows its sources
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PromptSpend - The LLM price list that shows its sources

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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.

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Hey Product Hunt 👋 I built PromptSpend because every LLM pricing calculator I found was a snapshot — someone hard-coded a dozen prices, and within a few months the whole thing was quietly wrong. So the pricing pipeline *is* the product here. Every morning it re-fetches from independent sources, cross-checks them, and either commits a clean update or opens a pull request for a human to look at. Every number on the site carries the source it came from and the date it was last confirmed — disagreements get flagged, not averaged away. Beyond the calculator: a public API, an MCP server for coding agents, a VS Code extension that prices the model on the line of code that calls it, and a "receipt" you can paste into any AI conversation to audit what it actually cost. Would love feedback — especially if you've been burned by a model price that moved without you noticing.