What Day One does well
Runs almost everywhere: iPhone, iPad, Apple Watch (audio or dictated entries), Android, Mac, Windows, and web, with sync across devices on paid tiers. Rich media entries: photos, video, audio, drawings, PDFs, plus location, weather, and activity captured automatically. On This Day memories, multiple journals, templates, and printed books make it a strong long-term life archive.
Where Lound differs
Voice is an attachment inside a text entry rather than the primary flow; transcription is iOS-only, happens after you stop, is capped at 10 minutes, and has to be switched on in settings. Pattern recognition across entries (Multi-Entry Summary, Daily Chat memory) sits behind the $74.99/yr Gold tier, and Multi-Entry Summary runs on entries you pick rather than watching your journal over time. Lound starts from the recording: the structure arrives after the thought is out, and the app remembers what you said so it can hand it back when it matters.
How to choose
If your journal is a record of your life, with photos, places, and memories you want to keep and print, Day One is excellent at it. If you think by talking and want an app that listens, structures what you said, and remembers it for you, Lound is the one built for that.