What is known
Regimen’s official site says it is available on iOS and Android, free for one compound, and $4.99/month or $39.99/year for multiple compounds. It advertises calculators, schedules, health integrations, and estimated curves.
Halflife’s current Apple App Store listing shows 5.0 from 26 ratings, free with in-app purchases, iOS 15.1+, and Data Not Collected. The listing says the free tier includes two compounds, full logging, weight tracking, four free tools, an adherence calculator, and community access.
Primary sources checked June 11, 2026: Regimen official source and Halflife App Store listing.
What is unknown
Regimen’s official pages conflict on compound breadth: its homepage says PK modeling for 40+ compounds while its own comparison article says a 150+ compound library. Exact current library and independent feature reliability are unknown.
Exact individual medication or peptide concentrations are also unknown. Any curve shown by either product is a model estimate unless it is tied to appropriate measurement.
The practical trade-off
Halflife’s current official listing is iPhone-only and says the free tier supports two compounds. Regimen publicly advertises native Android and a one-compound free tier. Both describe estimated curves; neither curve is a measured individual concentration.
Decision checklist
- Verify your exact platform and region in the current official marketplace listing.
- Confirm that the exact compounds, routes, units, and schedules you use are supported.
- Check every calculator input and ask whether a displayed level is measured or estimated.
- Review export, deletion, privacy, subscription, and cancellation details before committing.
- Do not change a prescribed dose based on a consumer tracker estimate.
Verdict
There is no evidence-based universal winner between Halflife and Regimen. The better choice is the one that matches the exact workflow, platform, and risk controls you require.
Frequently asked questions
What is a good Regimen alternative?
Halflife can be a good Regimen alternative for iPhone users whose priorities match Halflife’s current official feature set. It is not automatically the better choice for every platform or workflow.
Is Halflife better than Regimen?
That is not known as a universal fact. The products emphasize different workflows, and independent head-to-head reliability across every feature has not been established.
Are estimated remaining-level curves exact?
No. They are model estimates based on recorded doses and assumptions, not measured individual blood concentrations.