At a glance
| Feature | Peptide Protocol | Peptide Log |
|---|---|---|
| Platform | iPhone + free web tools | iOS, iPadOS, macOS, visionOS |
| PK concentration curves in the tracker | Summary + free web visualizer | In-depth per-dose curves |
| Multi-profile (household / clients) | Single-profile focused | Yes |
| Consumables tracking (syringes, BAC) | Yes, with runway | Yes |
| Peptide reference library | 29+ peptides, free glossary | Limited in-app |
| Reconstitution calculator | In-app + free web | In-app |
| Dose converter (mcg/mg/IU) | Free on web | In-app |
| Injection site rotation (body map) | Yes | Yes |
| Stacks / editorial combination guides | 7 stacks + glossary cross-links | Not available |
| Free public tools (no sign-up) | Yes | App-only |
| Price | Freemium | $8.99/mo or $39.99/yr |
Feature comparison reflects public information as of April 2026. Check each app's listing for the most current feature list.
Where Peptide Protocol is stronger
Much lower friction to try
Peptide Log is $8.99/mo — the highest in this category. Peptide Protocol is freemium, and our public calculators work without installing anything.
Public educational surface
Our glossary, stacks, and pillar guides are indexed, citable, and free. Peptide Log keeps reference material in-app.
Simpler daily loop
Multi-profile + deep PK curves is powerful for a clinician juggling clients. For a single user running their own protocol, Peptide Protocol keeps the daily screen calmer and shorter.
Where Peptide Log is stronger
PK depth
Peptide Log's in-app PK concentration curves are its standout feature. If you want per-dose plasma modeling on every log entry, it has more depth than our half-life visualizer.
Multi-profile
If you're logging for multiple people (e.g. a partner or clients), Peptide Log handles that natively. We're single-profile today.
Which to pick
Pick Peptide Protocol if…
You're running a single personal protocol, you care about a free public reference and calculator layer, and $8.99/mo feels steep for what you need.
Pick Peptide Log if…
You're a clinician or power user who wants per-dose pharmacokinetic curves and multi-profile support and is happy to pay for it.
How this page is maintained
This comparison is written by the Peptide Protocol team and is inherently biased toward our own strengths — we try to be fair about Peptide Log's, but the honest way to evaluate is to try both when possible. We update this page when feature sets change. If you spot something that has changed on either side, tell us.