Disclosure: we make Goodnight Journal, so we are not a neutral party here. We have tried to write the comparison we would want to read — and in this particular case, Daylio is the right answer for a lot of people.
This is the least like-for-like comparison on this site, and saying so up front is more useful than pretending otherwise. Daylio and Goodnight Journal are not really competing products. They are two different answers to “I want to keep track of my life,” and the honest question is which problem you actually have.
The short version
Daylio is a logger. You tap a mood, tap what you were doing, and you are done — about ten seconds, no writing required. Over months it turns those taps into charts.
Goodnight Journal is a journal. You write in sentences, privately by default, with the option to publish an individual entry to a community of other journal writers.
One produces data about your life. The other produces a record of it. Those are different things, and most people want one much more than the other.
Where Daylio is the better pick
You have started and abandoned a journal before. This is the big one, and it is worth being blunt about. The reason most journaling habits die is that writing takes a decision and a mood and ten spare minutes. Daylio needs none of those. It survives the week when you have nothing to say and no energy to say it, and a habit that survives bad weeks is worth more than one that only works when you are already doing well.
You want to see patterns rather than read your own prose. Tag your activities for three months and the charts stop being decorative. You find out that your mood reliably dips on Sunday evenings, or that the thing you assumed was draining you actually is not. Writing can get you there eventually; Daylio gets you there mechanically, and far faster.
You want something to bring to a doctor or therapist. A mood log with dates and activity tags is genuinely useful clinical context in a way that a stack of diary entries is not. If that is why you are tracking, Daylio is built for it and we are not.
You have ten seconds a day, not ten minutes. Then the comparison is over. Use Daylio.
If any of those describe you, go and use it. We would rather you built a habit that sticks somewhere else than bounced off ours in a fortnight.
Where Goodnight Journal is the better pick
You want to think on the page. A mood rating cannot do the thing where you start writing about why you are annoyed and discover halfway down that it is about something else entirely. That only happens in sentences. If that process is what you want from journaling, no amount of tagging substitutes for it.
You want the option of being read. Daylio is private, full stop — it has no community and is not trying to have one. Ours are private by default with a door you can open one entry at a time. Writing something you assumed was uniquely strange and finding four people who have written almost the same thing is a specific kind of relief, and it is the thing that keeps a lot of people writing on the days they would otherwise skip.
You want to read other people. Charts are not company.
You want the entry itself to be the point. In five years, a Daylio export tells you how you felt. A journal tells you what happened and what you made of it.
Honestly, using both works
This is the recommendation we would give a friend, and it is not a dodge.
Use Daylio as the daily habit — ten seconds, every day, no excuses, building the data. Use a journal for the entries that need more than a tag: the hard week, the decision, the thing you need to work out in writing.
They are not competing for the same slot in your day. One is a thermometer and the other is a diary, and most lives have room for both.
A note on mood tracking
If you are tracking mood because something is wrong, please treat the data as information rather than a diagnosis. Neither a mood tracker nor a journal is a substitute for professional care, and if low mood is persistent, worsening, or interfering with your sleep, work or relationships, that is worth raising with a doctor or therapist. A log is a genuinely useful thing to bring to that conversation — it works best alongside real support, not instead of it.
How to decide
Ten seconds a day and you want patterns — Daylio.
You want to write, and sometimes be heard — Goodnight Journal.
You are not sure — start with Daylio, because the habit is easier to keep, and add a journal when you find yourself wanting to say more than a tag allows.
For the other comparisons, see vs Penzu for the sealed-diary case, vs Journey for coaching and Android, and our roundup for the wider field.