Planners and calculators that go alongside the games. All free, all instant, none of them ask for an account.
The games measure things. These tools help you do something with the measurement — decide what to practise, work out which of two improvements is worth more, structure a week you will actually keep, or see whether your scores are genuinely moving rather than just bouncing around.
Every tool runs entirely in your browser. Where something is saved — a memory palace, a score log — it is saved to your own browser's storage and never sent to us. That means it is private, and it also means clearing your browsing data deletes it and it does not sync between devices.
The score tracker exports a CSV for exactly that reason, and the planners print.
The plan builder and streak planner answer the question people actually stall on, which is not "which game" but "when". Most people who abandon brain training never decided what to play or on which days, and a concrete week fixes more than any single game does.