Underlayer is training you embed in your own product. Build courses by API, with AI, or from Claude over MCP, then drop them in with one iframe. The player takes your fonts and colours, so it looks like part of your app, and the API tells you who finished. No LMS portal, no learner accounts, no seat licences: you pay per course view. Need a customer's LMS? Export SCORM 1.2 or 2004. Free sandbox with 500 course views a month, no card.
Forty trials, each a spec an AI's answer has to hit exactly — three bullets, fifty words, valid JSON, no letter O. You never write the answer, only the instruction. A parser scores it, never an opinion. Fewest strokes wins.
Error tracking and cookieless analytics from one SDK, for Next.js and Expo. Grouped issues with source-mapped stacks, traces you can read, traffic and Web Vitals per page. No consent banner. Free plan, no credit card. Paid from $9/mo, flat per org.
