Frequently asked questions

Yes. Every game and the daily plan are free to play, with ads that never interrupt an active round or an unsaved result. There's an optional Pro upgrade for players who want to remove ads; it's never required to see whether you like the app.

No. You can play your first workout as a guest, with no email and no payment. An account exists only so your progress can follow you to a new phone — it's an option you can take later from Settings, not a requirement to start.

Android today, on Google Play. iOS is planned as a second platform.

It depends what "work" means. Several of the tasks Brain Train's games are built on — working memory updating, the Stroop interference test, useful-field-of-view training — are long-studied paradigms in cognitive psychology, and playing them repeatedly will make you measurably better at that specific task. What the science is far less settled on is how much a specific trained task generalizes to broader, everyday thinking. We don't claim Brain Train measures your IQ, treats any condition, or prevents cognitive decline — it's a short, repeatable habit built on real tasks, not a medical intervention.

A few minutes a day is the shape the app is built around — short enough to be a habit rather than a chore. There's no evidence that longer sessions make the underlying tasks more effective; consistency (showing up most days) matters more than any single session's length.

Because they're measurements, not a score that only ever climbs. Mastery, skill index and the training index are allowed to fall as well as rise — that's what makes them honest about where you actually stand today, rather than a number that just accumulates over time regardless of how you're playing.

A skill needs a handful of sessions before its number means anything. Below that, the app shows the word "calibrating" instead of guessing — a placeholder number would look precise without being true.

No — that's the whole point. You finish a round, send the link, and they play the identical round whenever they're free. There's no lobby and nothing to schedule.

No. A duel pays no XP, mastery, skill index or streak credit — it's purely a score to compare, so there's nothing at stake in the numbers that make up your actual training picture.