Lectures, ideas recorded on the go, meetings: the Voice Memos app saves everything as .m4a. Share the file and TraScrivo turns it into timestamped text, nothing to install.
Transcribe now, free →Voice Memos uses .m4a (AAC), light and good quality: TraScrivo accepts it directly. If you enabled lossless recording the file is larger but works just the same. No need to convert to mp3.
Keep the iPhone within a metre of the speaker, microphone towards the voice; turn on "Enhance Recording" (the wand icon) to cut background noise. Long recordings? No problem: even a two-hour lecture is transcribed in full.
Yes: they sync to the iPhone in the same .m4a format.
Yes, trascrivo.com works in the iPhone browser: pick the file from Files and transcribe.
No. It is transcribed and deleted right away. No account.