Daily Symptom & WHOOP Tracker

Log your symptoms, pull in your WHOOP data, compare chemo cycles, and find out whether what you're feeling is normal — or at least normal for you.

I built this because I was sick of not knowing whether Day 3 of chemo was supposed to feel this rough. You're on your third or fourth cycle, and you can't quite remember if the nausea hit harder this time. Or whether your HRV dropped further. So you spend 2am scrolling through hospital notes and WHOOP data, panicking slightly. This tool puts it all in one place.

What It Does

Daily Symptom Logging

Quick, frictionless entry for how you're feeling each day. Energy levels, nausea, pain, sleep quality, appetite — whatever matters to you.

WHOOP Data Integration

Pulls in your sleep, recovery, strain, and HRV data. See your body's objective metrics alongside your subjective feelings.

Historical Cycle Comparison

Line up your last three chemo cycles side-by-side. Compare Day 3 to Day 3. Is it actually worse, or does it just feel worse?

Pattern Recognition

AI spots the patterns you'd miss. When your energy crashes. Whether steroids on Day 1 help or hurt. What's consistent.

Reassurance Engine

At 2am, when your HRV is 15 and you're convinced something's broken, see exactly what your HRV was at the same point last cycle.

NotebookLM Backup

Your complete tracking history is backed up to a NotebookLM library. Ask it questions about your own data over months.

Who It's For

Anyone on active chemo who wants to understand their own patterns. You don't need technical skills. You don't need to know anything about your WHOOP data — the tool does that part.

How to Build Your Own

This tracker runs in Claude (Anthropic's AI). Here's roughly how I set it up — you can adapt it for your own treatment.

What you need

Claude (claude.ai) — this is where the tracker lives. I use a Project with custom instructions.

WHOOP (optional) — if you have one, export your daily data and paste it in. If not, you can track symptoms manually.

NotebookLM (optional) — for long-term memory. I back up tracker summaries here so the AI can reference months of data.

The approach

Set up a Claude Project with instructions that know your chemo schedule, cycle length, and what you want to track.

Each day, tell it how you're feeling and paste in your WHOOP stats. It logs everything, compares to previous cycles, and flags patterns.

I write about the full setup process on the blog — including the three-part series on the protocol, the process, and the results.

I'm constantly refining how this works. The blog is the best place to follow along as things evolve.

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⚕️ FC:AI does not offer medical advice. This is a personal tracking and management tool. Your medical team handles the medicine.