Engineering notes from building an iOS keyboard engine that has to be mistaken for the system one.https://pressboardkit.com/enhttps://pressboardkit.com/blog/czech-spell-checker-never-flagged-a-typo/https://pressboardkit.com/blog/czech-spell-checker-never-flagged-a-typo/The system spell checker is not equally implemented in every language, and where it is not, it does not report an error — it reports that everything you type is spelled correctly. Finding that out took three conclusions and a physical device.Tue, 15 Sep 2026 00:00:00 GMTAutocorrectMeasurementLanguageshttps://pressboardkit.com/blog/measuring-the-double-space-period-shortcut/https://pressboardkit.com/blog/measuring-the-double-space-period-shortcut/Two spaces become a full stop — but only if the second one arrives in time. iOS exposes no such value to read, so we built an instrument, measured it against the native keyboard, and wrote down the error bar as well as the answer.Thu, 30 Jul 2026 00:00:00 GMTParityMeasurementText inputhttps://pressboardkit.com/blog/a-demo-app-is-not-a-keyboard-extension/https://pressboardkit.com/blog/a-demo-app-is-not-a-keyboard-extension/A keyboard extension does not run where your demo app runs, and it does not receive touches the same way. Twice we shipped a fix that worked perfectly in a preview and did nothing at all in the real keyboard.Thu, 18 Jun 2026 00:00:00 GMTTouch handlingTestingiOS internals