# Peptly vs Stack

The clearest difference is update cadence: Peptly at weekly against Stack's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Peptly sells 10 in-app purchases, starting at $0.99 per 7 days and Stack sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Peptly ships an update weekly, Stack every 2 weeks. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Peptly | Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (34 ratings)](https://appshunter.io/ios/app/peptly-peptide-log-and-tracker/id6764067504/reviews)** | — |
| Number of ratings | **34** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Freemium | — |
| Size | 29 MB | 106 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Baris Bingor](https://appshunter.io/developer/1634613310) | [Amari Thomas](https://appshunter.io/developer/1868315587) |

## What reviewers say

### Peptly

[App page](https://appshunter.io/ios/app/peptly-peptide-log-and-tracker/id6764067504)

This app simplifies peptide reconstitution and dosing for researchers and biohackers. It provides instant calculations, visual syringe guides, and a dose log, all processed on-device for privacy. Unlock advanced features like reminders and export options with a subscription.

**Highlights:** Instant reconstitution math, Visual syringe guide, Pre-loaded peptide profiles, On-device dose log, Smart dose reminders, Save and reload protocols, CSV export

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Peptly Pro Weekly | $0.99 | per 7 days |
| Peptly Pro Weekly | $1.99 | per 7 days |
| Peptly Pro Weekly | $2.99 | per 7 days |
| Peptly Pro Weekly | $4.99 | per 7 days |
| Peptly Pro Yearly | $19.99 | per year |
| Peptly Pro Yearly | $29.99 | per year |
| Peptly Pro Yearly | $49.99 | per year |
| Peptly Pro Lifetime | $29.99 | one-time |
| Peptly Pro Lifetime | $49.99 | one-time |
| Peptly Pro Lifetime | $79.99 | one-time |


### Stack

[App page](https://appshunter.io/ios/app/stack-peptide-tracker/id6773488687)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack Weekly | $9.99 | per 7 days |
| Stack Yearly | $49.99 | per year |


## Frequently asked questions

### Is Peptly free?

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

### Is Stack free?

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

### Do Peptly or Stack have ads?

Neither Peptly nor Stack shows ads.

### Which is updated more often, Peptly or Stack?

Peptly ships an update weekly, and Stack every 2 weeks. Most recently, Peptly was updated on October 31, 2026 and Stack 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.*