Head to head
PepCycle vs Shotsy
Last reviewed · Written by the PepCycle team
Shotsy positions itself around GLP-1 injection tracking — weight-loss medications, weekly shots, and the metrics that go with them. PepCycle is built around format: pens, manufacturer vials and lyophilised vials each get the fields that apply to them. If you only use a pen, either may suit; if you also reconstitute vials, that difference is the deciding one.
How each product positions itself
Shotsy presents itself publicly as a GLP-1 injection tracker: logging weekly shots, tracking weight alongside them, and the surrounding metrics that matter to people on weight-management medications. It is a focused product for a large, well-defined audience.
PepCycle starts from a different premise — that the same person often takes a Wegovy pen and a reconstituted BPC-157 vial, and that forcing both through one format's assumptions breaks the record. Format is therefore a property of each compound rather than a global assumption. See pens versus vials.
The tests that will decide it for you
- Add a lyophilised vial with a mass and a diluent volume, and check whether the app derives a concentration in mcg/mL.
- Enter a 100 mg vial and see whether the field accepts it. See GHK-Cu.
- Add a blend — one vial, three peptides, three masses.
- Set an every-3-day schedule rather than a weekly one. See every-N-day schedules.
- Backdate an entry eleven days and check that vial contents and next-due dates recalculate.
- Export to CSV and confirm vial concentrations are included, not just entries.
- Check where the data lives and whether an account is required.
- Note when the price is shown relative to when you enter personal information.
Run all eight on both apps. Whichever handles your actual protocol is the right answer, and it may well not be ours.
PepCycle's answers to those eight
| Test | PepCycle |
|---|---|
| Lyophilised vial with derived concentration | Yes — mass and diluent volume in, mcg/mL out |
| 100 mg (and 1,000 mg) vials | Yes — no vial-size cap |
| Blends as one vial with components | Yes — per-component amounts derived from one volume |
| Every-N-day and on/off schedules | Yes, with explicit anchoring |
| Backdating recalculates downstream | Yes — vial contents and next-due dates |
| Export with concentrations | Yes — CSV and JSON, including vials and blends |
| Data location | On-device, synced via your own iCloud |
| Account required | No |
What PepCycle does not claim to be is a weight-loss community or a coaching product. If that is what you want alongside your log, weigh that honestly.
Who each suits
- Only a GLP-1 pen, and you want weight-focused features: a GLP-1-specialist app is a reasonable fit — test both.
- Pens plus reconstituted vials: format-awareness is the deciding factor, and the tests above will show it immediately.
- Blends, large vials, or every-N-day intervals: check the data model before committing, whichever app you lean toward.
- Data ownership matters most: compare export completeness and where the log is stored.
Frequently asked questions
Is PepCycle a Shotsy alternative?
They overlap for GLP-1 pen logging, but they are built around different assumptions. Shotsy is positioned around GLP-1 injection and weight tracking; PepCycle treats format as a property of each compound so pens and reconstituted vials share one timeline. Which is better depends on whether you use vials.
Can Shotsy track research peptides?
Check its current feature list directly rather than relying on this page — app features change constantly. The specific capability to test is whether you can enter a vial mass and diluent volume and have the app derive a concentration in mcg/mL, which is what reconstituted peptides require.
Which is better for weight-loss medication tracking?
Both log weekly injections. If you want weight-focused features and community around a GLP-1 journey specifically, a GLP-1 specialist may suit you better. If you want one timeline covering everything you take, that is what PepCycle is for.
Related pages
Run the tests on us too
Download PepCycle and try the awkward cases yourself: a 200 mg vial, a three-peptide blend, an every-3-day schedule, and an entry backdated eleven days. That is a better evaluation than any comparison page, including this one.
Free to download · No account required · Price shown before you enter anything personal