# Peptides Calculator vs PepStack

The clearest difference is update cadence: PepStack at every 2 days against Peptides Calculator's every 5 days. PepStack also leads on iOS requirement (15.5 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Peptides Calculator sells 11 in-app purchases, starting at $9.99 per month and PepStack sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Peptides Calculator ships an update every 5 days, PepStack every 2 days. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Peptides Calculator | PepStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (173 ratings)](https://appshunter.io/ios/app/peptides-calculator/id6744431355/reviews)** | — |
| Number of ratings | **173** | — |
| Positive reviews | 54.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 77 MB | 85 MB |
| Requires iOS | 17.6 | **15.5** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Sphnix, Inc](https://appshunter.io/developer/1796901749) | [Max Berktold](https://appshunter.io/developer/1596273015) |

## What reviewers say

### Peptides Calculator

[App page](https://appshunter.io/ios/app/peptides-calculator/id6744431355)

This app helps users log, organize, and manage their peptide preparation process. It offers features for calculating reconstitution details, saving vial records, and accessing educational content. An optional subscription unlocks unlimited entries, enhanced tracking, and multi-device sync.

**Highlights:** Log and calculate reconstitution details, Save and organize vial records, Browse peptide reference library, Access educational videos and articles, Track weight over time, Multi-device sync (Pro)

**Features:** macOS Compatibility, Family Sharing, Apple Wallet, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Access | $9.99 | per month |
| Family Monthly Premium Access | $14.99 | per month |
| Premium Plus | $14.99 | per month |
| Premium Plus Family (Montly) | $19.99 | per month |
| Pro Loyalty Yearly | $54.99 | per year |
| Yearly Premium Access | $99.99 | per year |
| Premium Plus Loyalty Yearly | $99.99 | per year |
| Family Yearly Premium Access | $149.99 | per year |
| Premium Plus (Yearly) | $149.99 | per year |
| Premium Plus — Family (Yearly) | $199.99 | per year |
| Remove Ads | $2.99 | one-time |

**What reviewers like**

- 👍 Easy to save vial info
- 👍 Nicely set up and laid out
- 💡 Streaks and last taken feature

**What reviewers complain about**

- 🐛 Lost access to previous peptide calculations
- 🐛 Unable to update streaks and last taken
- 🐛 Unable to record when a dose was taken

**Reported bugs**

- All vials disappeared after an update
- Unable to find how to update streaks and last taken

**Requested features**

- Add shot tracker to record when a dose was taken
- Allow editing of vial information and dosing
- Add option to set cycle length in weeks, not just days
- Allow changing dose for different weeks when titrating


### PepStack

[App page](https://appshunter.io/ios/app/pepstack-biohacking-tracker/id6760306960)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PepStack Premium (Monthly) | $2.99 | per month |
| PepStack Premium (Yearly) | $22.99 | per year |


## Frequently asked questions

### Is Peptides Calculator free?

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

### Is PepStack free?

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

### Do Peptides Calculator or PepStack have ads?

Neither Peptides Calculator nor PepStack shows ads.

### Which is updated more often, Peptides Calculator or PepStack?

Peptides Calculator ships an update every 5 days, and PepStack every 2 days. Most recently, Peptides Calculator was updated on October 12, 2026 and PepStack on October 7, 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.*