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Switching from OptiPin?
OptiPin set the bar for pharmacokinetic modeling in TRT tracking. Doseline takes that depth cross-platform and cross-community.
OptiPin pioneered PK hormone modeling for TRT users — Cmax, Tmax, ester-specific curves. It's genuinely impressive technical work and we respect what they've built. We're here because not everyone is on iOS, and not everyone only tracks testosterone.
Feature by feature.
| OptiPin | Doseline | |
|---|---|---|
| Medications tracked (free) | 1 after trial [VERIFY] | Unlimited |
| Pharmacokinetic modeling | ✓ | ✓ |
| Hormone level estimation (Cmax/Tmax) | ✓ | ✓ |
| TRT / AAS tracking | ✓ | ✓ |
| GLP-1 tracking | Partial [VERIFY] | ✓ |
| HRT tracking | — | ✓ |
| Peptide tracking | ✓ | ✓ |
| Injection site rotation | ✓ | ✓ |
| Bloodwork tracking | Paid [VERIFY] | Free |
| Weight tracking | — | ✓ |
| Body measurements | — | ✓ |
| Side effect logging | ✓ | ✓ |
| Progress photos | — | ✓ |
| Titration schedules | — | ✓ |
| Vial / inventory tracking | ✓ | — |
| Peptide reconstitution calculator | ✓ | ✓ |
| iOS app | ✓ | ✓ |
| Android app | — | ✓ |
| No account required | ✓ | ✓ |
| Mature / polished UI | Pre-1.0 [VERIFY] | ✓ |
Why people switch.
Same PK depth, but you can actually use the free tier.
OptiPin limits you to one medication after the 14-day trial. If you're running testosterone plus an AI, or test plus HCG, you need to subscribe. Doseline gives you unlimited medications, PK charts, and bloodwork tracking — all free.
Android exists.
OptiPin requires iOS 18.1+. If you're on Android — or might switch someday — Doseline is native on both platforms with identical features. No compromise.
More than just hormones.
OptiPin focuses on TRT and peptides, with limited GLP-1 support and no HRT coverage. Doseline serves all four communities with equal depth — your GLP-1, your TRT, your HRT, your peptides, all in one app.
Polished, not pre-release.
OptiPin is still at v0.9.8 — solid for early adopters, but still evolving. Doseline is built with intentional design from day one: considered UI, consistent patterns, and an interface that feels finished.
What you'll gain.
Switching from OptiPin to Doseline gets you:
Unlimited free medications (not just 1)
Android app with full feature parity
Weight and body composition tracking
Progress photos
GLP-1 titration schedules
HRT community support
Free bloodwork logging
Polished, production-quality design
OptiPin serves
Doseline serves
Switch in 2 minutes.
Download Doseline, add your medications, and you're tracking. No account required. Free tier from day one.
Common questions.
Is Doseline's PK modeling as accurate as OptiPin's?
Doseline uses published pharmacokinetic data for all supported medications — the same peer-reviewed sources that inform OptiPin's modeling. Both show Cmax, Tmax, and estimated serum levels. Neither is a medical device — both are informational tools.
Does Doseline have vial/inventory tracking?
Not yet. OptiPin's inventory tracking (batch numbers, concentration, storage) is a feature we respect. It's on our roadmap but not in the initial release. If that's a dealbreaker, OptiPin may be better for you right now.
I use OptiPin for peptides. Will Doseline support my stack?
Yes. Doseline supports multi-compound peptide protocols with reconstitution calculators, individual PK modeling per compound, and injection site rotation. If you're running BPC-157, CJC/Ipa, and TB-500 together, Doseline tracks all of them.
Why should I trust a newer app over OptiPin?
Fair question. OptiPin has more time in the market. Doseline's advantage is broader scope (4 communities, not 2), a more generous free tier, and Android support. Try the free tier — if it doesn't meet your needs, you haven't lost anything.