The key difference
Overskill emphasizes describing an app and having core operational pieces wired into the workflow. Lovable is known for a visual AI-building workflow where developers can iterate on generated applications and connected services.
What to compare
Test sign-in, saved data, permissions, payments, integrations, deployment, export, mobile behavior, and the amount of manual setup required.
Which should you choose?
Choose based on the finished application you can actually ship, not on a headline feature count. If reducing operational wiring is your priority, Overskill deserves a test. If editor control is the priority, Lovable may be the better fit.