# PepCalc Pro vs PeptideOS+

The clearest difference is price: PeptideOS+ at Free against PepCalc Pro's $2.99. PeptideOS+ also leads on update cadence (every 4 days vs every 4 months). PepCalc Pro's advantage is in-app purchases (none vs 2) and device support (3 vs 1). On ads there is nothing between them.

PeptideOS+ is free to download; PepCalc Pro costs $2.99 up front. PeptideOS+ sells 2 in-app purchases, starting at $9.99 per month. PepCalc Pro asks for nothing beyond the download.

PepCalc Pro ships an update every 4 months, PeptideOS+ every 4 days. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | PepCalc Pro | PeptideOS+ |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pepcalc-pro/id6757834926/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Paid | — |
| Size | 41 MB | 6 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [Matthew Fishman](https://appshunter.io/developer/1838052729) | [ZACHARY CANCIANO GOLD](https://appshunter.io/developer/1875956705) |

## What reviewers say

### PepCalc Pro

[App page](https://appshunter.io/ios/app/pepcalc-pro/id6757834926)

This app offers precise calculations for research protocols, managing inventory, and scheduling tasks. It provides a verifiable audit trail with transparent math and is designed for offline use with a focus on user privacy. Export your records in various formats for external documentation.

**Highlights:** Precision concentration calculations, Visual protocol calendar and scheduling, Seamless inventory management, Verifiable records with audit trail, Offline-first data privacy, Professional CSV/PDF exporting

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

**In-app purchases:** none


### PeptideOS+

[App page](https://appshunter.io/ios/app/peptideos-plus/id6762200959)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Yearly | $69.99 | per year |


## Frequently asked questions

### Is PepCalc Pro free?

PepCalc Pro costs $2.99, with no in-app purchases.

### Is PeptideOS+ free?

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

### Do PepCalc Pro or PeptideOS+ have ads?

Neither PepCalc Pro nor PeptideOS+ shows ads.

### Which is updated more often, PepCalc Pro or PeptideOS+?

PepCalc Pro ships an update every 4 months, and PeptideOS+ every 4 days. Most recently, PepCalc Pro was updated on October 31, 2026 and PeptideOS+ on October 24, 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.*