# Peptide AI vs LychnoFit

The clearest difference is iOS requirement: LychnoFit at 15.1 against Peptide AI's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Peptide AI sells 4 in-app purchases, starting at $6.99 per 7 days and LychnoFit sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on October 10, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Peptide AI | LychnoFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (69 ratings)](https://appshunter.io/ios/app/peptide-ai-tracker-and-dosing/id6760374374/reviews)** | — |
| Number of ratings | **69** | — |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 days | Every 5 days |
| Monetization | Freemium | — |
| Size | 37 MB | 52 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Peptide AI](https://appshunter.io/developer/1884181684) | [Hasan ergunt](https://appshunter.io/developer/6777539412) |

## What reviewers say

### Peptide AI

[App page](https://appshunter.io/ios/app/peptide-ai-tracker-and-dosing/id6760374374)

Track peptide cycles, log lab results, and gain AI-powered insights into your physiology. Visualize your progress with body scanning and make informed decisions based on research-grade science.

**Highlights:** Protocol tracking and reminders, Biomarker analysis, AI-powered data summaries, Body composition scanning, Research-grade scientific basis, Secure and private data handling

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Peptide AI Weekly Subscription | $6.99 | per 7 days |
| Peptide AI Monthly Subscription | $14.99 | per month |
| Peptide AI Annual Discount | $29.99 | per year |
| Peptide AI Annual Subscription | $59.99 | per year |


### LychnoFit

[App page](https://appshunter.io/ios/app/lychnofit/id6777539410)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Quarterly | $2.99 | per 3 months |
| Yearly | $6.99 | per year |


## Frequently asked questions

### Is Peptide AI free?

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

### Is LychnoFit free?

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

### Do Peptide AI or LychnoFit have ads?

Both Peptide AI and LychnoFit show ads.

### Which is updated more often, Peptide AI or LychnoFit?

Peptide AI ships an update every 5 days, and LychnoFit every 5 days. Most recently, Peptide AI was updated on October 10, 2026 and LychnoFit on October 1, 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.*