Mull synthesises your mood data and tells you exactly what's driving your best and worst days, in plain language, not charts.
Please enter a valid email address.
No spam. No credit card. Your data is never sold or shared. How it works →
The problem
You track, journal, try different interventions. You're not lazy. You've been paying attention. But the same bad days come back, because without seeing your specific patterns, you're guessing at causes. And generic advice doesn't help when the problem is yours alone.
Entries pile up. Charts fill in. But nothing reads it back to you. You have evidence — you just have no conclusion.
You've tried sleep hygiene, supplements, journaling, cutting caffeine. They address symptoms. The actual cause stays opaque.
You can feel it: certain situations, certain people, certain weeks. But you can't see it clearly enough to trust it or act on it.
“I've tried everything I can find. Sleep hygiene. The supplements everyone recommends. Journaling. I do the work. But none of it has ever told me specifically what's actually driving my bad days, or why some weeks I feel completely like myself and others I barely recognise who I am.”
How it works
The path from confusion to clarity is simpler than you think. Mull does the hard part.
A 90-second check-in: mood, energy, who you saw, what you did. No essays. No pressure. Just the raw material.
Sleep, exercise, social contact, screen time, caffeine. You choose. Mull learns which ones actually correlate with your mood, not what correlates on average.
Every week, a plain-language synthesis of your patterns. Not “exercise is good for mood.” Yours: “Your mood averages 7.6 on mornings you train, and 5.4 when you don't.”
The shift
Right now you know how you feel. Mull gets you to knowing why, and that changes everything.
“I've been logging for months and trying every intervention I can find. I have all this data, all these failed experiments, and I still don't know what's actually causing the dips. It feels like I'm fixing the wrong things.”
“I know that my best days follow morning workouts, that working from home without a social lunch tanks my afternoon, and that checking social media on my days off reliably tanks my evening. None of that was what I expected. I can actually work with it now.”
Features
Not built for people who want to feel busy tracking. Built for people who actually want to understand themselves.
Every week, Mull reads your entries and tells you what drove your best and worst days: specific findings in language you can actually use, not charts you have to interpret.
Mull learns which variables correlate with your mood, not population averages. Sleep might not be your lever. Something else might be. You find out.
“What happens when I don't check social media in the morning?” Set a variable, track it, and let Mull measure the actual effect on your mood over time.
Mull uses Claude AI (by Anthropic) to analyse your patterns. Your entries are never used to train models, sold, or shared with third parties. You can export or delete everything, any time.
The cost of not knowing
When you don't know what's actually driving how you feel, every intervention is a guess. Some people spend years in that loop, not because they aren't trying, but because they're trying without information.
How your data works
Most apps bury this. We don't.
Your journal entries are stored securely and only ever used to generate your personal insights. They are never sent to ad brokers, data brokers, or any third party.
Mull uses Anthropic's Claude API to find your patterns. Anthropic's privacy policy applies: your data is never used to train Claude or any other model.
You own your data. Export it or delete your entire account with no waiting period, no retention, no questions asked.
Over 70% of mental health apps monetise user data. Mull doesn't. We charge a subscription. Your data has no role in our business model.
Questions about your data? Email hello@getmull.app. A human will reply.
Early access
Join the waitlist. Early access members get founding pricing, direct input into what we build, and first access when we launch.
Please enter a valid email address.
No spam. No credit card. Your data is never sold or shared. How it works →