About TierDiff
TierDiff tracks the free-tier limits and listed prices of developer services, AI tools and work apps. It reads each service's own pricing page every day, and every number on the site comes with the sentence it was copied from and a link to that page.
What it does
- Once a day, our bot reads each service's public pricing or documentation page.
- A number is kept only if the exact sentence it comes from is found on that page. The sentence is saved as evidence, next to the link and the date.
- The site shows the values from the latest daily check, each with its check date. When a number moves, a person checks it against the page before the change is added to the change history.
- Fetching or reading problems are never treated as a change: a page that fails to load does not count as a free tier going away.
How the bot works and how to stop it
Who runs it
TierDiff is run independently. It is not owned by any of the services it lists (see referral links below).
Contact
For questions, corrections or anything else, write to hello@tierdiff.com.
Using the data
The same data is available as static JSON files, with no key and no sign-up. Use the values freely; a link back to TierDiff is appreciated, for example:
Data: TierDiff (https://tierdiff.com). Values come from each vendor's official pricing page.
Reporting a mistake
If a number looks wrong, write to the address above with the service name and, if you can, the page that shows the right value. The page is rechecked; if the reading was wrong, the extraction rule is fixed and the page is read again. Numbers are never typed in by hand. The Report a wrong number link at the bottom of every page opens an email to the same address.
How TierDiff is funded
Some links to official sites may become referral links. They never change the numbers, the order, which services are listed or our picks. Read the disclosure.