# Peptide Tracker vs E1RM Calculator

Peptide Tracker and E1RM Calculator are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Peptide Tracker sells 11 in-app purchases, starting at $0.99 per 7 days and E1RM Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Peptide Tracker ships an update fortnightly, E1RM Calculator every 8 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Peptide Tracker | E1RM Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (442 ratings)](https://appshunter.io/ios/app/peptide-tracker-pepflow/id6740525224/reviews)** | — |
| Number of ratings | **442** | — |
| Positive reviews | 77.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 8 days** |
| Monetization | Free with in-app purchases | — |
| Size | 181 MB | 0 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [keinois OU](https://appshunter.io/developer/1597616328) | [Paul Walsh](https://appshunter.io/developer/1879357731) |

## What reviewers say

### Peptide Tracker

[App page](https://appshunter.io/ios/app/peptide-tracker-pepflow/id6740525224)

Calculate peptide dosages and reconstitution accurately and quickly. Track your injections with timely reminders and live activities. Save custom formulas and sync across devices for seamless management.

**Highlights:** Peptide dosage calculation, Reconstitution guidance, Injection time tracking, Custom formula saving, Widget for daily doses, Reminders and Live Activities, iCloud sync across devices

**Features:** Family Sharing

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PepFlow PRO (Weekly) | $0.99 | per 7 days |
| PepFlow PRO (Monthly) | $2.99 | per month |
| PepFlow PRO (Weekly) | $2.99 | per 7 days |
| Peptide PRO (Weekly) | $2.99 | per 7 days |
| PepFlow PRO (Weekly) | $3.99 | per 7 days |
| PepFlow PRO (Annual) | $8.99 | per year |
| PepFlow PRO (Monthly) | $9.99 | per month |
| Peptide PRO (Annual) | $14.99 | per year |
| Peptide PRO (Annual) | $19.99 | per year |
| PepFlow PRO (Annual) | $29.99 | per year |
| Peptide PRO (Annual) | $44.99 | per year |


### E1RM Calculator

[App page](https://appshunter.io/ios/app/e1rm-calculator-rpe-based/id6759536865)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support Developer | $1.99 | one-time |


## Frequently asked questions

### Is Peptide Tracker free?

Peptide Tracker is free to download, with in-app purchases available.

### Is E1RM Calculator free?

E1RM Calculator is free to download, with in-app purchases available.

### Do Peptide Tracker or E1RM Calculator have ads?

Neither Peptide Tracker nor E1RM Calculator shows ads.

### Which is updated more often, Peptide Tracker or E1RM Calculator?

Peptide Tracker ships an update fortnightly, and E1RM Calculator every 8 days. Most recently, Peptide Tracker was updated on October 30, 2026 and E1RM Calculator on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*