# Ketobo vs PeptideStack

The clearest difference is iOS requirement: Ketobo at 13.0 against PeptideStack's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Ketobo sells 1 one-off in-app purchase and PeptideStack sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Ketobo ships an update fortnightly, PeptideStack monthly. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Ketobo | PeptideStack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Size | 69 MB | 40 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Edin Causevic](https://appshunter.io/developer/1873829505) | [Enes Koc](https://appshunter.io/developer/1876640525) |

## What reviewers say

### Ketobo

[App page](https://appshunter.io/ios/app/ketobo/id6758589867)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ketobo Lifetime | $8.99 | one-time |


### PeptideStack

[App page](https://appshunter.io/ios/app/peptidestack-peptide-tracker/id6763878251)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PeptideStack Premium Monthly | $4.99 | per month |
| PeptideStack Premium Annual | $29.99 | per year |
| PeptideStack Premium Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Ketobo free?

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

### Is PeptideStack free?

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

### Do Ketobo or PeptideStack have ads?

Neither Ketobo nor PeptideStack shows ads.

### Which is updated more often, Ketobo or PeptideStack?

Ketobo ships an update fortnightly, and PeptideStack monthly. Most recently, Ketobo was updated on October 31, 2026 and PeptideStack on November 5, 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.*