I will be honest: there is no definitive ranking of license checker apps, because the good ones are databases, not apps. But founders keep asking for a top five, so here is the honest version: the five kinds of tools founders actually use to check AI model licenses before shipping.
The first is a general AI assistant. ChatGPT, Claude, Copilot, Gemini, whichever you like. Ask it to explain a clause in plain English. Fast, usually right on the basics, occasionally confident about something it invented. Treat it as a starting point, not a verdict. It is not a lawyer.
The second is a reference for the license text itself. The most boring app on this list and the most useful: the actual Apache 2.0 text or the Llama Community License, searchable on your phone and pull-up-able mid-meeting. A mobile reference app for AI model licenses beats a PDF in a browser tab every time.
Third: a checklist. Whatever you already use for checklists is fine. The point is a repeatable review you run per model: grant, thresholds, restrictions, attribution, version match. Same order, every time.
Fourth: a notes app for your license log. Model, version, license, date checked, link to the file. One note per model. When diligence arrives, you hand over the notes instead of reconstructing them from memory at the worst possible moment.
Fifth: a proper AI model license checker with a real database behind it. Instant commercial rights lookups that someone else keeps current, instead of you maintaining the spreadsheet. Judge it on three things: does it cite the actual license file, does it track versions, and is it current. Everything else is decoration.
An AI model license checker app for iOS or Android that passes those three tests earns its place on your home screen. I keep an AI model commercial rights lookup tool with 200 models compared at localaitools.fyi, and I write commercial-use clearance reports when you want it in writing.