Contact: https://github.com/khakhasshi/nineteen-support/issues
- Requirements: iPhone or iPad running iOS 18 or later. - Language: tap the globe on the Today or Stats screen. - Time limit: open Practice and choose a preset or a custom limit of 1–30 seconds. - Factor questions: enter two whole numbers from 1 to 19 whose product matches the question. Either order is accepted. - Leaderboards: stored on your device; completed sessions are compared only when mode, question count, and time limit match. - Records: stored locally, with no in-app cloud sync or export. Deleting the app may erase records. - Report an issue: include your device model, OS version, app version, steps to reproduce, and relevant screenshots. Hide personal information first.
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