The short answer: free until money is involved. For license compliance apps, the honest comparison is free for learning, paid when money is on the line. Here is the version that actually matters.
Free options do three things well. They explain license basics, they look up common licenses like Apache 2.0 and MIT, and they draft simple checklists. An AI legal compliance app free tier is a fine study aid. Nobody should pay money to learn what "permissive" means.
Paid options earn their price in three different places. Version tracking: licenses change, and paid tools watch for that. Audit trails: a timestamped record of what was checked and when, which is what diligence actually asks for. And human review: someone accountable standing behind the verdict. A license compliance audit SaaS without an audit trail is a search box with a subscription. I would not pay for that.
The trap is the middle: a paid app that does nothing a free one cannot. Before you subscribe, ask what you get that the license file itself does not give you. If the answer is vibes, keep your money.
There is a third option people forget: a commercial use clearance SaaS API. If license checks gate your product decisions programmatically, an API returning structured verdicts beats any app. Overkill for a two-person startup. Sensible the moment compliance becomes a workflow instead of a question.
Whatever you choose, the deliverable is identical: model, version, license, date checked, source link. I keep that record for 200 models at localaitools.fyi, and I write commercial-use clearance reports when the stakes justify a human doing it.