Track your daily events and let Undercurrent find the hidden patterns. Real data for your next doctor's visit, not guesswork.
No account required. Your data never leaves your device.
The problem
Headaches that seem random. Energy crashes out of nowhere. You suspect something is causing it, but every time the doctor asks "have you noticed any patterns?" you draw a blank.
Undercurrent finds the patterns for you.
Our daughter was getting headaches and we had no idea why. The doctor kept asking if we'd noticed any patterns and we'd just shrug. My wife and I really wanted a way to track everything in one place.
We've been using Undercurrent for a few months now and we're already seeing things we never would have caught on our own. Certain foods on days with bad sleep seem to line up with her worst days. We're bringing that data to her next appointment.
That's what I wanted: something that gives you real data instead of guesses.
How it works
Just start logging and let the patterns emerge.
Symptoms, food, meds, activities — capture events in seconds. Or just tell the AI what's going on in plain language.
Every event lands on a visual timeline. Over days and weeks, a picture of your daily life takes shape.
See what tends to precede your symptoms, what helps recovery, and what your risk factors are.
Generate a PDF report with your patterns and triggers. Walk into your next appointment with data.
Features
Most health apps track one thing. Undercurrent tracks the connections between everything.
Describe what's happening in plain language. The on-device AI understands "headache after lunch" and logs it for you. No forms needed.
Correlations, sequences, clusters, streaks, and time-of-day patterns. Explainable algorithms, no black boxes.
Separate profiles for yourself, your kids, or a parent you're caring for. Each gets their own timeline and reports.
Free automatic weather, pressure, humidity, and air quality tracking. Plus Apple Health sync for workouts and mindfulness to surface hidden connections.
AI explanations of your patterns, running entirely on your device. Your data never touches a server.
Pricing
Free to start with event logging, AI chat, and basic insights. One purchase to unlock everything.
Full correlations and long-term seasonal trends across your entire history.
Unlimited profiles for your whole family, plus unlimited markers and topics.
Generate PDF reports to share patterns and triggers with your healthcare provider.
Sync workouts, mindfulness, and other health data from Apple Health to surface hidden correlations.
Risk and protective factors, recovery insights, peak timing, and weekly and seasonal patterns.
Back up your data to your personal iCloud account, protected by Apple's built-in encryption.
Privacy
Most health apps share your data with advertisers. Undercurrent takes a fundamentally different approach.
All your data lives on your device in a local database. There is no cloud sync by default, no server that stores your health information.
Start tracking immediately. No email, no sign-up, no profile. Nothing to breach because nothing is collected.
Back up your data through your personal iCloud account, protected by Apple's built-in encryption. No extra servers, no extra accounts.
AI features run entirely on your phone using Apple Intelligence. Your data is never sent to OpenAI, Google, or any external service.
Privacy concerns sourced from: Health Policy and Privacy Challenges (PMC, 2020) · Brown University Center for Digital Health, 2023 · npj Digital Medicine, 2021
Research
The approach behind Undercurrent is backed by clinical and behavioral research.
A review of 85 studies found self-monitoring and feedback to be the most effective techniques in digital health interventions for chronic conditions.
Clinical studies have confirmed smartphone diaries as an effective tool for trigger assessment, with daily tracking predicting symptom risk within 24 hours.
Visual diary summaries help patients and providers focus on actionable plans rather than vague recollections.
FAQ
Yes. Free gives you event logging, AI chat, timeline views, and basic pattern analysis. Pro unlocks deeper insights, unlimited profiles, PDF reports, and more.
With Pro, your data is backed up to your personal iCloud account. Sign in on your new device and it's all there.
No. Pro is $19.99, one time. No recurring charges, no annual renewals.
Your first insights can appear within days. The longer you log, the more patterns emerge — from weekly rhythms to seasonal trends.
With Pro, create separate profiles for each person. Each gets their own timeline, patterns, and reports.
No. The AI runs entirely on your device using Apple Intelligence. Environmental data (weather, air quality) does need a connection.
No. Undercurrent helps you observe and record patterns to share with your doctor. Always consult a professional for medical advice.
Free to use. Pro for $19.99, one time, forever.
No account. No data collection. No strings.