Daybook vs deariary: AI on your writing vs AI on your data
Both of these products use a language model, both call themselves a journal, and they do almost opposite things with the model. The difference is not capability. It is what the model is pointed at.
Daybook points it at your writing. You keep a journal, and the AI reads what you wrote and answers questions about it. deariary points it at your data. Your tools log a day, and the model writes the entry.
If you are choosing between them, that sentence is most of the decision.
What Daybook is
Daybook is a journaling app from Daybook Labs Inc, on iOS as Daybook: AI Journal & Diary in the Health & Fitness category, rated 4.7 from 890 ratings, with an Android app and a web version at web.daybook.app. At the time of writing the iOS listing shows version 1.7.2, dated November 2024.
Guided templates, not a blank page. Daybook’s central idea is structure. There are guided journals for mood and activity tracking, a mental health journal aimed at stress and anxiety, and a gratitude journal. Rather than an empty field, you get a shape to fill in, which is a meaningful difference for anyone whose journaling failed at not knowing what to write.
Mood and activity logging with analysis. You log how you feel and what you did, and a mood analyser produces insight from the accumulated logs. This is the Daylio-style pattern with a journal attached.
An AI that reads your entries. You can ask questions about what you have written and get answers drawn from your own journal. This is the feature the name now leads with, and it is a genuinely good use of a language model: your entries are the corpus, and a corpus is much more useful when you can interrogate it.
Cross-platform, including voice. Web, Android, iOS, and an Alexa connection for capturing entries by speaking. Multi-platform coverage plus a voice route is more than most journaling apps manage, and the voice option in particular removes a real barrier.
Free to use, with a premium tier. The app is free. The iOS listing shows Daybook Premium at $4.49 monthly and $29.99 yearly, with a one-time option listed at $94.99. Check current prices in your own store, since these move.
Passcode protection. The journal locks locally, which matters for a product you keep on a phone.
The overall shape is a well-featured journaling app that has added a language model in the most obvious and defensible place: on top of the text you produced.
Where that model has a floor
Everything above is downstream of one act: you writing an entry.
No entry, nothing to analyse. This is not a criticism of the AI, it is arithmetic. An assistant that answers questions about your journal is exactly as good as the journal, and on the weeks you did not write, it has nothing. The insight feature has the same coverage as your discipline.
Templates lower the cost, they do not remove it. A guided journal is easier than a blank one. It still requires opening the app and completing something, at a time of day when you are least inclined to. The blank page problem becomes a shorter-form problem rather than a solved one.
Mood ratings compress a day to a number. A five-point scale plus an activity tag produces a trend, and a trend describes a period rather than a day. Six months later “3, tired, work” does not reopen the Thursday. We wrote separately about what a mood button can hold.
Nothing arrives from outside. Daybook has no integrations with your calendar, your task manager, your messages, your listening or anywhere else. Everything in it was typed or spoken into it, so the record’s coverage is exactly equal to your input, and the parts of a day you never thought to mention are absent by construction.
The record reflects your judgment of what mattered. You write about the things that seemed worth writing about. That is a filter applied at the worst possible time, since you do not yet know which ordinary days you will want back.
What deariary does with the same technology
deariary has no templates, no mood scale, no prompts, and nothing to fill in. It connects to services you already use, currently thirteen (GitHub, Google Calendar, Slack, Todoist, Bluesky, Discord, Steam, Trakt, Last.fm, Toggl Track, Swarm, Linear, plus a webhook), reads what they logged for a day, and generates that day’s entry overnight.
The model does the writing rather than the reading. An entry comes out as prose: the meeting and who was in it, what shipped before lunch, the tasks that closed, the cafe at three, the album that played twice. Underneath, images that arrived through connected accounts and a short list of the day’s structured signals.
The consequences that matter for this comparison:
Coverage does not depend on you. There is an entry for the Thursday you were too tired to open anything.
The material comes from outside your recall, so it includes the things you would never have written down.
And no filter was applied at write time. Nothing decided which days deserved lines.
What deariary does not have is the good part of Daybook. There is no assistant to ask about your feelings, no gratitude template, no mood trend, no wellbeing framing, and no mobile app at all. It is web only, which against a product shipping on iOS, Android, web and Alexa is a straightforward disadvantage.
At a glance
| Daybook | deariary | |
|---|---|---|
| Where the entry comes from | You write or speak it | Generated from connected services |
| What the AI does | Reads and answers questions about your entries | Writes the entry from your activity data |
| Blank page | Reduced by guided templates | Removed |
| Days you skip | No entry, nothing to analyse | Entry appears anyway |
| Integrations | None | 13 services plus webhook |
| Mood tracking | Mood and activity logs with analysis | No mood scale |
| Structure | Guided journals: gratitude, mental health, mood | Free-form prose, one entry per day |
| Platforms | Web, iOS, Android, Alexa | Web |
| Voice capture | Yes, via Alexa | No |
| Local lock | Passcode | Account login |
| Pricing | Free; Premium listed at $4.49/mo, $29.99/yr, $94.99 one-time | Free for one integration, paid plans above that |
The question that decides it
Ask what you want to be true in six months.
If the answer is “I want to have built a reflective practice, with structure, and be able to ask my own journal what has been going on,” Daybook is designed for exactly that and has the better tooling for it. The templates are real, the AI-over-your-entries idea is sound, and the platform coverage means it will be wherever you are.
If the answer is “I want to be able to read back an ordinary Tuesday in April,” the deciding factor is not features. It is whether the record will exist. Every product in the guided-journal category, Daybook included, produces a record shaped like your consistency. deariary produces one shaped like your calendar.
Who should use which
Use Daybook if you want to journal and need help doing it: prompts, structure, mood tracking, a lock on your phone, and something that can answer questions about what you have written. If you already write reasonably often, its AI feature gets better the more you write, which is the right incentive alignment for a journaling app.
Use deariary if you have already learned that you will not write consistently, and what you want is coverage rather than a practice. No prompts, no streak, no template, and an entry on the days you did nothing worth reporting.
Use both if the split is what you actually want: Daybook for the interior on the days you feel like writing, deariary underneath so the other days are not blank. They do not overlap much, because one records what you chose to say and the other records what happened.
Starting
Daybook is free on the App Store, Google Play and the web, with Premium available in-app. Verify current pricing yourself.
deariary is free for one integration at deariary.com. Connect one service and read tomorrow’s entry before deciding anything.
One of them makes journaling easier. The other makes it unnecessary.
