What is the best alternative to Pain Tracker - Diary and Log on iPhone?

Migraine Buddy: Track Headache, S tier, #1 in pain tracking.

Is there a free alternative to Pain Tracker - Diary and Log?

Yes: Migraine Buddy: Track Headache (S tier, #1) is free to download, with in-app purchases.

Yes. 5 apps rank above it in pain tracking: Migraine Buddy: Track Headache (#1), Aavia: Cycle Symptom Relief (#2), Manage My Pain (#3) and more.

Pain Tracker - Diary and Log is F tier, #6 of the 6 tiered apps in pain tracking. Here is everything that competes with it on iPhone, in tier order.

1
Migraine Buddy: Track HeadacheShigher tier
Free + IAP · ★ 4.8 · 80,624 ratings · score 93
Migraine and headache diary app for recording attacks, triggers, and patterns, with reports that can be shared with.
2
Aavia: Cycle Symptom ReliefBhigher tier
Free + IAP · ★ 4.4 · 4,862 ratings · score 76
Tracks cycle symptoms and patterns, with VIP personalized relief recommendations.
3
Manage My PainChigher tier
Free + IAP · ★ 4.7 · 493 ratings · score 65
Free iOS pain tracker for logging pain and activity, spotting patterns, and sharing reports with doctors.
4
Pain Journal: Symptom TrackerChigher tier
Free + IAP · ★ 4.6 · 7 ratings · score 60
A pain diary that logs symptoms on a 39-zone body map and creates PDF summaries for doctor appointments.
5
My Pain Diary: Chronic Pain & Symptom TrackerF
$4.99 · ★ 4.0 · 151 ratings · score 31
Tracks chronic pain, symptoms and triggers with weather data, graphs and calendars for reports to share with doctors.

What is the best alternative to Pain Tracker - Diary and Log on iPhone?: Migraine Buddy: Track Headache, S tier, #1 in pain tracking.
Is there a free alternative to Pain Tracker - Diary and Log?: Yes: Migraine Buddy: Track Headache (S tier, #1) is free to download, with in-app purchases.
Does anything rank above Pain Tracker - Diary and Log?: Yes. 5 apps rank above it in pain tracking: Migraine Buddy: Track Headache (#1), Aavia: Cycle Symptom Relief (#2), Manage My Pain (#3) and more.