Hi Product Hunt 👋 I'm the maker of Keiko Study.

I built Keiko because test-prep marketing drove me a little crazy with fake "students", borrowed stats, and "raise your score by X!" promises no one can back up. So Keiko has one rule: every exam fact and formula links to its source (the official ETS/GMAC page or a standard textbook), right next to the claim. If a page is still being reviewed, it says so.

A few things that make it different:

- Free to actually use. Every study page and tool works with no account. You only pay if you want saved history, mocks, and the AI tutor starting at €8.99/mo.

- Confidence vs. accuracy. You rate how sure you are before each answer, then see that against how often you were right. It's a mirror, not a score prediction.

- GRE subject tests (Physics/Math/Psychology): coverage the big platforms skip.

- No fake proof. No invented reviews, no promised score jumps. The only numbers you see come from your own attempts.

It's early and I'd genuinely love feedback, especially on what's missing or unclear. Happy to answer anything about how the sourcing, calibration, or pricing works. Thanks for taking a look 🙏