Most trackers count.
Plotline explains.

Log a headache, a coffee, a workout, a bad night's sleep — one tap each. Plotline runs real statistics across your history and tells you which things actually go together.

Open the web app See how it works

Free · No account · Works offline · Android app coming soon

Three steps, then it does the work

Setup takes about a minute. The analysis runs by itself from then on.

Step 1

Pick what you track

Start from a preset — symptoms, daily habits, fitness — or build your own. Counts, amounts, durations, or a 0–5 severity rating.

Step 2

Tap as it happens

One tap logs the moment. Add a note or a #tag if you want. Forgot in the moment? Backdate it later.

Step 3

Read the findings

Say which topics are outcomes and which might influence them. Plotline handles the statistics and writes up what it finds.

Statistics are easy to do badly

Most apps hand you a chart and let you draw your own conclusions — which is how people end up certain about things that never happened. Plotline is built to report associations with their uncertainty, not to claim that one habit causes another outcome.

“You logged coffee after 4pm on 12 days, and slept 47 minutes less on those nights.”
Significant · q < 0.05

Every influence is tested against every outcome, so you don't have to guess which pair to look at.
Corrected for multiple comparisons using Benjamini–Hochberg false-discovery control. Test enough pairs and something always looks striking by chance; this is what stops that.
Confirmed two ways. A finding is only called significant if it survives both a parametric and a rank-based test.
Timing effects too — whether something in the evening changes the next day, not just the same one.
Written in plain English, using your own topic names, with the numbers shown so you can judge them yourself.

Your data stays under your control

Analysis runs on your device, with no Plotline account or analytics. Records stay local unless you export them or enable backups to your own Google Drive.

No account, no sign-up

Open it and start. Nothing to register, nothing to verify, no email required.

No ads, no trackers

No analytics of any kind — not even the anonymous sort. Nothing is measured about you.

Backups you control

Export the whole history to JSON whenever you like, or sync to your own Google Drive. Optional, and off by default.

Open source

The entire app is public. You don't have to take any of this on trust — you can go and read it.

Open the web app

Most trackers count.Plotline explains.