What a free GLP-1 tracker should make clear
- Known: recorded product, amount, unit, date, time, site, and completion status.
- Known: source-backed half-life context for semaglutide and tirzepatide.
- Unknown: exact personal concentration and symptom cause from a log alone.
- Estimate: a curve based on half-life inputs, timing, and assumptions.
How this differs from a GLP-1-only app
Shotsy ranks well because it uses a clear GLP-1-specific message: shots, side effects, progress, dose planning, and injection rotation. That narrow focus is useful. Halflife takes a broader route: GLP-1s can live beside peptides, TRT, insulin, and other records in one protocol timeline.
Record the event
Preserve product, amount, unit, date, time, site, and whether the event was completed, delayed, skipped, or corrected.
Keep observations separate
Weight and symptoms are useful context, but timing alone does not prove cause.
Use label context
Semaglutide and tirzepatide have different half-life assumptions and different product labels.
Track the full stack
A GLP-1 record may be only one part of a larger protocol record.
Sources checked June 19, 2026: Halflife App Store listing, Shotsy official site, FDA Ozempic prescribing information, and FDA Mounjaro prescribing information.
Frequently asked questions
Is Halflife a free GLP-1 tracker?
Halflife is free to download on iPhone. The current App Store listing describes free logging and tools, with in-app purchases also listed.
Does Halflife work as a semaglutide app?
Yes. Halflife includes semaglutide tracking context and links into the semaglutide half-life profile.
Does Halflife work as a tirzepatide app?
Yes. Halflife includes tirzepatide tracking context and links into the tirzepatide half-life profile.
Start with the free GLP-1 record
Halflife - Peptide & GLP-1 Log organizes shots, schedules, weight, symptoms, sites, vial context, and estimated curves on iPhone.
Download Halflife - Peptide & GLP-1 Log