Free API

TierDiff's free-tier data for developer services, AI tools and work apps, as static JSON files, rebuilt with the site. No key and no sign-up; any origin can fetch them.

Endpoints

• /api/v1/products.json — every service: id, name, category, pricing URL, whether it has a free plan, last check
• /api/v1/products/neon.json — one service: current values per plan and metric, with source URL and check time, plus its change history
• /api/v1/changes.json — every reviewed change, newest first
• /api/v1/metrics.json — the metric vocabulary: key, name, unit, period

Example

curl https://tierdiff.com/api/v1/products/neon.json

const res = await fetch("https://tierdiff.com/api/v1/changes.json");
const { changes } = await res.json();

Feeds and badges

• /changes/feed.xml — RSS of reviewed changes, newest 50
• /p/<id>/feed.xml — RSS for one service
• /badge/<id>.svg, /badge/<id>/<metric>.svg — SVG badges with a service's free-tier value

Every value comes from the vendor's own official page. Use the values freely; a link back to TierDiff (tierdiff.com) is appreciated.