Research
The API resolves a username against the platform itself; this free tool shows what that answer looks like on sample data.
Free to start — 150 credits on signup, no card.
What it does
Resolved lookup
in the API, not a static availability list
Taken or free
with the owning profile if taken
Checked per platform
names differ across surfaces
Behind the tool
Every tool here is a thin interface over the same public API you can call yourself. If you want the output in your own software rather than a form, the quickstart gets you a working request in about a minute, and pricing is per call — one-time packs, with optional auto-recharge.
More research tools
150 free credits and a ready-made key the moment you sign up. No card.