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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.
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.
About PromptSpend on Product Hunt
“The LLM price list that shows its sources”
PromptSpend was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #148 on the daily leaderboard. 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.
On the analytics side, PromptSpend competes within API, Developer Tools and Artificial Intelligence — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how PromptSpend performed against the three products that launched closest to it on the same day.
Who hunted PromptSpend?
PromptSpend was hunted by Andrew Avery. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of PromptSpend including community comment highlights and product details, visit the product overview.
Andrew Avery