Head to head
PepCycle vs PeptIQ
Last reviewed · Written by the PepCycle team
PeptIQ and PepCycle both target people tracking research peptides, which makes the comparison narrower and more useful than a GLP-1 head-to-head. The differences worth testing are structural: vial-size limits, blend handling, schedule shapes, where data lives, and how complete the export is.
Same category, different models
PeptIQ presents publicly as a peptide tracker with calculators, research tools and web access alongside its app. PepCycle is an iPhone-first log built on local-first storage with iCloud sync, no account, and format-aware compounds covering GLP-1 pens as well as reconstituted vials.
Because both serve the same audience, the useful comparison is not "which does peptides" but how each represents the awkward cases — and every peptide tracker has the same awkward cases.
The five awkward cases
- A 200 mg vial. GHK-Cu routinely comes at 50–200 mg and NAD+ at up to 1,000 mg. Any hard cap shows up here immediately.
- A three-peptide blend in one vial. Can it be one vial with components, or must you fabricate three? See blends and stacks.
- Every-3-day scheduling, which weekday checkboxes cannot express. See every-N-day schedules.
- Editing a diluent volume on an existing vial without destroying its entries.
- Backdating eleven days and checking that vial contents and next-due dates recalculate rather than going stale.
These five take about five minutes to test in any app and tell you more than any feature list.
Where your data lives
This is the question with the longest consequences, and it is worth answering explicitly for any app before you enter three months of history.
| Question | PepCycle |
|---|---|
| Account required? | No |
| Where is the log stored? | On your device |
| How does sync work? | Through your own iCloud, private database |
| Does the developer hold a copy? | No — there is no PepCycle server for log data |
| Export format | CSV and JSON, including vials, concentrations and blend components |
| Works fully offline? | Yes |
Ask the same six questions of any alternative. The answers are usually in a privacy policy rather than a feature list — see our data and privacy page for ours.
Web access versus on-device
There is a genuine trade-off here rather than a right answer. Web access means your log is reachable from any browser, which requires it to live on a server. On-device storage means nobody else holds your health record, which means no web log-in.
- If cross-device web access matters more than data locality, a server-backed tracker is the right architecture and you should choose one deliberately.
- If you would rather no company holds your log, local-first with personal-iCloud sync is the trade PepCycle makes.
- Either way, test the export — it is what protects you regardless of architecture.
- Our free web calculators run entirely in the browser and store nothing, so calculation does not require either trade-off.
Frequently asked questions
Is PepCycle a PeptIQ alternative?
Both target peptide tracking, so yes in the sense of serving the same need. The differences to test are structural: vial-size limits, blend representation, schedule shapes, where data is stored, and export completeness. Check current feature sets directly — this page reflects public information as of July 2026.
Does PepCycle have web access?
The log itself is iPhone-only and stored on your device, because a web log-in would require your health record to live on a server. The calculators on this site are free web tools that run entirely in your browser.
What is the fastest way to compare two peptide trackers?
Test the five awkward cases: a 200 mg vial, a three-peptide blend, an every-3-day schedule, editing a diluent volume, and backdating eleven days. Five minutes in each app tells you more than any comparison article, including this one.
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