How difficult is a question?

To a subject matter expert, almost every question feels easy. Learn how Difficulty Calibration predicts how difficult a question will feel before any learner has answered it.

Discover five AI services that help organizations turn source material into adaptive courses, calibrate question difficulty, keep drills current, and create realistic learning experiences.

Discover Story Crafter, clearer questions, AI-evaluated open answers and improved language support in the latest Drillster Question Crafter update.

This month marks 15 years since Thomas Goossens and Marco van Sterkenburg founded Drillster. We started with a simple but ambitious idea: fight the forgetting curve and change the way people learn and perform.

We are proud to share that Drillster has once again been included in the Fosway 9-Grid™ for Learning Systems 2026, one of the most respected independent analyses of the learning technology market in Europe.

We're excited to announce a major update to the Drillster Question Crafter, designed to make your learning experiences sharper, more structured, and more effective than ever before!