App Comparison · 2026
Shotlee is free, cross-platform, and handles basic dose history and injection site rotation. For users running single compounds with simple schedules, it works.
For multi-compound protocols, reconstitution math, PK modeling, or cost tracking, it runs out of capability quickly.
Cost
Protocol
Free + Pro tiers
Shotlee
Free
Injection map
Protocol
3D with color-coded tissue rest
Shotlee
2D flat image
Reconstitution calc
Protocol
Yes — forward + reverse
Shotlee
No
PK curves
Protocol
Yes (Pro)
Shotlee
No
Shotlee's injection site log is a flat image. You tap a region, it records it. The history exists as a list. For users doing a few injections per week in obvious rotation, this is enough.
Protocol uses a 3D model with eight tracked zones, color-coded tissue rest status, and automatic site suggestions based on logged history. On a 5-day-on protocol with multiple injection sites, the difference between a flat log and a spatial model with rest tracking becomes significant. Lipodystrophy is a real consequence of poor rotation on long protocols.
Shotlee does not have a reconstitution calculator. You enter doses manually after doing the math elsewhere. Protocol includes a full calculator covering 81 compounds. The reverse calculator (units to dose) is also available — useful when calibrating against actual syringe marks.
The free web calculator at protocolapp.health/tools/reconstitution-calculator is available with no account or app download required.
If you are tracking a single compound on a straightforward schedule, care about cost (free), and do not need reconstitution math, PK modeling, or multi-compound stack support, Shotlee works. It is simple and it is genuinely free. Protocol is also free at its core tier, but the feature set assumes a more involved protocol. For basic single-injection tracking, Shotlee's simplicity is an advantage.
For most users running peptide protocols, yes. Protocol adds a 3D injection site map (vs Shotlee's 2D log), a reconstitution calculator with reverse mode, PK curve modeling, cost-per-dose inventory tracking, and an 81-compound research library. Shotlee is free and handles basic dose history and site rotation for users who want a simpler tool.
Yes, Shotlee is free. Protocol is also free to download with core tracking features. Protocol's Pro tier ($9.99/month, $59.99/year, or $149.99 lifetime) adds PK curves, AI stack analysis, and advanced analytics. Both apps are available on iOS and Android.
Shotlee does not include a dedicated reconstitution calculator. Protocol has a full calculator covering 81 compounds with a concentration slider, preset dose options, and a reverse calculator (enter syringe units to find your dose). The free web version is at protocolapp.health/tools/reconstitution-calculator.
Shotlee uses a flat image-based injection site log. Protocol uses a 3D anatomical body map with simultaneous front and back views. Sites are color-coded by tissue rest status: green for fully rested, orange for recent, red for today. The model suggests the next injection site based on your logged history across eight body zones.