Originally published at steadyline.app
Daylio is genuinely good at what it does. Clean interface, low friction, pleasant to use. If you want to track your mood in a quick, consistent way, it delivers. I understand why millions of people use it.
But I have bipolar disorder. And after a few months with Daylio, I kept running into the same problem: the app was built for someone else.
Not because Daylio is bad. Because bipolar has specific needs that general mood trackers aren't designed to meet — and that gap matters more than it might seem.
What Daylio does well
To be fair: Daylio nails the basics. The emoji-based mood entry is fast, the activity tagging is flexible, and the charts are clean. The friction to log is so low that you actually do it. That consistency matters — a tracker you use every day beats a sophisticated one you use twice a week.
The correlation features are genuinely clever. It will tell you that on days you went for a walk, your mood averaged higher. That's useful.
And for most people — people tracking stress, productivity, general wellbeing — Daylio is probably enough.
Where it breaks down for bipolar
It uses a single mood axis.
This is the core problem. Daylio asks: how are you feeling? You pick a face from terrible to great.
But bipolar doesn't work on a single axis. Mood and energy are separate dimensions — and the combinations matter clinically. High energy with good mood might be a productive day. High energy with low mood is a mixed state, which is one of the more dangerous presentations of bipolar. Low mood with low energy is depression. Low mood with high energy is agitation.
A single number collapses all of that into one data point. You lose the most important information.
There's no stability tracking.
People with bipolar don't just track how they feel today. They track how consistent they've been. Stability is its own metric — separate from whether you're currently up or down. I can have a decent mood day and still feel fundamentally unstable. Daylio can't capture that distinction.
The patterns it surfaces aren't the ones that matter for bipolar.
"You're happier on weekends" is a fine insight for most people. What I need to know is: how many days before a depressive episode does my sleep start degrading? What's the relationship between missing my medication dose and my mood three days later? How does my current trajectory compare to the last time I was in an episode?
These aren't exotic questions. They're exactly what my psychiatrist needs answered. Daylio doesn't get there.
There's no clinician report.
My psychiatry appointments are 15 minutes. I'm supposed to summarize weeks of mental health data from memory while potentially in an episode. Daylio can show me charts — but there's no way to export a structured summary I can hand to my doctor.
This sounds like a minor feature gap. It isn't. The whole point of tracking is to improve your clinical care. If the data never makes it into the room with your doctor, you're tracking for yourself only.
What you actually need if you have bipolar
I spent a while trying to find a tracker that handled these things properly. The list of requirements wasn't long:
- Separate axes for mood, energy, sleep, and stability
- Pattern detection that finds the relationships between them automatically — not just charts
- A way to talk to the data (not just read it)
- A clinician report that looks like it was made in this decade
- Something that works on your worst days, not just your good ones
That last one matters more than it gets credit for. When you're in an episode, a complicated interface is an insurmountable barrier. The app has to be usable at your lowest.
What I ended up building
I'm a software engineer. After enough months of looking for something that fit, I built it.
Steadyline tracks mood, energy, sleep, medication, and stability separately. There's an AI layer that reads your history and surfaces patterns you wouldn't catch manually — the kind of delayed correlations between sleep and mood, or medication timing and stability, that take months to see on your own. There's a clinician report you can generate in seconds. And the logging experience is fast enough to actually use on bad days.
It's not a replacement for Daylio if you want something simple and general. But if you have bipolar and you've been using Daylio and feeling like you're doing most of the interpretive work yourself — that's the gap Steadyline was built for.
The short version
Daylio is a good mood tracker. Bipolar needs more than mood tracking.
If you want an app that tracks the full picture — mood, energy, sleep, stability, medication — and actually helps you understand the patterns rather than just recording them, Steadyline is worth a look. Free to start.
I'm a software engineer living with bipolar disorder. I built Steadyline because general mood trackers kept missing the point.
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