Tapebook

Yes. Recording is unlimited and free, recordings up to 15 minutes are transcribed in full (longer ones get their first 15 minutes), and playback highlights every word. Tapebook Pro is a one-time Lifetime unlock or a yearly plan, and both unlock the same features. The yearly plan can start with a 7 day free trial for new subscribers where Google Play offers it. No weekly or monthly plans.

No. The speech engine runs on your phone, there is no account, and the app has no internet permission, so it cannot send your recordings or transcripts anywhere. Android backup is switched off for the app too. A recording only leaves the phone if you share or export it yourself.

Transcripts of any length, more accurate models (English Plus, and European languages covering 25 languages), speaker labels you can rename, importing audio and video files, export to text, subtitles, Markdown or Word, search across every transcript, and summaries made on the phone.

The free model is English. Pro adds English Plus, which makes about a fifth fewer mistakes, and European languages, which covers 25 languages. They download once through Google Play and then run on the phone.

It depends on the phone. On a typical mid range phone an hour of audio takes several minutes, and long transcriptions carry on in the background with a progress notification. The app shows an estimate before it starts, and Settings has a speed test.

Clear speech close to the phone comes out well. Like any speech model, it can make mistakes with noise, music or people talking over each other, so check names, numbers and quotes against the recording. You can fix a word by pressing and holding its paragraph.

Please do not. Tell people you are recording and why, and stop if anyone objects. Recording someone without their agreement can break privacy law, and many schools, universities and workplaces have their own rules.