Side effects, tracked the way your oncologist grades them.
Log how you feel in about a minute a day. The app turns your answers into estimated toxicity grades, so your care team sees exactly what happened between visits, on one screen.
Created by an oncologist to help patients. Free, no account, and your information stays on your iPhone.
Want to know when it's ready? Email support@chemosideeffecttracker.com and we'll let you know.
Everything you need between visits
Questions your team grades by
Each symptom asks the real grading questions in plain words, like "how many more bowel movements than your normal?" or "does it make buttons or writing hard?"
Estimated CTCAE v6.0 grades
Your answers map to the National Cancer Institute's current grading criteria, color-coded from mild to severe.
Built for your regimen
Choose your treatment and the app picks the side effects that matter for it. FOLFOX, FOLFIRINOX, carboplatin combinations, immunotherapy, and more.
Where you are in your cycle
Day of cycle, typical phases like the low blood count window, and a countdown to your next treatment.
Red flags you can't miss
A fever of 100.4°F or higher, an ER visit, or very high blood pressure brings up a clear "call your care team" alert.
Planned or ongoing treatment
Track "cycle 5 of 12," or time on treatment for therapy that continues as long as it's working.
Tracking side effects between visits makes a difference
Better quality of life, longer survival
In a randomized trial, people on chemotherapy who reported their symptoms between visits had better quality of life and lived longer than those who didn't (Basch et al., JAMA, 2017).
Memory blurs the details
Two or three weeks between appointments is a long time. Logging as you go means your care team sees what really happened, not just what you remember in a short visit.
Grades guide decisions
Oncologists use toxicity grades to decide when to adjust treatment. Clear, graded information helps your team make those calls with you.
One screen your oncologist can read in seconds
Hand over your phone, or send a one-page PDF. The Doctor view shows only what matters: a few key points, then every side effect color-coded by grade, cycle by cycle.
- Up to three high-yield points: fevers, ER visits, Grade 3 side effects, anything getting worse
- Worst grade per cycle, so cumulative effects like neuropathy stand out
- One-page PDF to attach to a patient-portal message, email, or text
- Ask your clinic to connect it to your medical record, whatever system they use
Just describe how you feel
Type or say something like "five loose stools today and my fingers tingle when I button my shirt." The app suggests the matching answers, each quoting your own words, and you confirm before anything is saved.
- Runs on your iPhone. Your words aren't sent to any AI service
- Nothing is saved until you review it
- Never gives medical advice or suggests treatment changes
- Works with Siri: "Log how I feel in Chemo Tracker"
Your whole picture, in one place
Apple Health
Sleep, steps, resting heart rate, and weight, with 7-day trends next to how you feel. A rising heart rate or weight loss is flagged.
Withings and other devices
Scales, blood pressure cuffs, and thermometers that sync to Apple Health show up automatically.
This cycle vs. last
A day-by-day chart of side effects and activity, so you can see which days are hardest and plan around them.
Calendar reminders
Add expected treatment dates to your iPhone Calendar, with a reminder the day before.
Siri and Shortcuts
"No side effects today," "Log my temperature," or "Show my doctor view," hands-free.
Light or dark
A calm design that follows your iPhone, or pick light or dark.
Your health information never leaves your phone unless you send it
Read the full privacy policy.
Coming later
- Sending reports straight into your clinic's medical record, where your health system allows it
- More regimens and cancer types
Frequently asked questions
Is it really free?
Yes. No subscription, no ads, and no in-app purchases.
Who made this app?
It was created by a practicing oncologist to help patients keep track of side effects between visits and share a clear picture with their care team.
Does it replace my care team or give medical advice?
No. It records what you report and estimates grades for your care team to review. It never recommends treatment or dose changes. For urgent symptoms, call your care team or 911.
What are CTCAE grades?
The Common Terminology Criteria for Adverse Events (CTCAE) is the National Cancer Institute's standard for describing how severe a side effect is, from Grade 1 (mild) to Grade 5. The app estimates Grades 1–3 from your answers; urgent events are flagged separately.
Which treatments does it support?
Common chemotherapy and immunotherapy regimens, including FOLFOX, FOLFIRI and FOLFIRINOX (with or without bevacizumab or cetuximab), gemcitabine with nab-paclitaxel, carboplatin combinations with pembrolizumab, AC, TC, paclitaxel, capecitabine, and immunotherapy. "Other" lets you choose your own symptoms.
Is there an Android version?
Not yet. The app is for iPhone.
Coming soon to the App Store
Chemo Side Effect Tracker is free for iPhone. Created by an oncologist to help patients.