Pricing is refreshed daily from AWS docs, using the same JSON endpoint their pricing page pulls it from. The latest successful snapshot is stored with this site. On-demand pricing comes straight from the feed; the "reserved 1yr convertible (no-upfront)" column is estimated from the on-demand price using a per-family discount, since AWS does not expose a compact reserved-pricing feed.
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The reason I built this is because my favorite "goto" tool - https://ec2instances.info/ - has been acquired, lacks updates, has some unfixed bugs and misses some pricing. So I put together this little app to pull the data from AWS docs directly and display it in a sortable table.