# OnePetri vs Phage Study

The clearest difference is price: Phage Study at Free against OnePetri's $0.99. Phage Study also leads on rating (5.0 vs 3.0). OnePetri's advantage is ratings volume (8 vs 1). On update cadence, ads, in-app purchases and device support there is nothing between them.

Phage Study is free to download; OnePetri costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Phage Study holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: OnePetri has 8 ratings behind it against 1, so its average is the more settled of the two.

OnePetri ships an update every 6 months, Phage Study every 5 months. The most recent releases landed on October 15, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | OnePetri | Phage Study |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.0 (8 ratings)](https://appshunter.io/ios/app/onepetri/id1576075754/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/phage-study/id1658579818/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Paid | **Free** |
| Size | 9 MB | 59 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Michael Shamash](https://appshunter.io/developer/604696747) | [Adaptive Phage Therapeutics, Inc](https://appshunter.io/developer/1575574864) |

## What reviewers say

### OnePetri

[App page](https://appshunter.io/ios/app/onepetri/id1576075754)

Automate the counting of plaques on petri dishes using AI and computer vision. This app performs common assay calculations and processes images locally on your device for privacy. It supports bacteriophage plaque-based assays with future plans for bacterial CFU counts.

**Highlights:** AI-powered plaque detection, Automated plaque counting, Real-time assay calculations, Local on-device image processing, Supports bacteriophage assays, Open-source code and dataset

**In-app purchases:** none


### Phage Study

[App page](https://appshunter.io/ios/app/phage-study/id1658579818)

Access information about clinical studies focused on using bacteriophages to combat multi-drug resistant infections. This utility provides details on ongoing research and treatment approaches.

**Highlights:** Clinical study information, Phage therapy details, Multi-drug resistant infections, Research updates

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OnePetri free?

OnePetri costs $0.99, with no in-app purchases.

### Is Phage Study free?

Phage Study is free to download, with no in-app purchases.

### Which has better reviews, OnePetri or Phage Study?

Phage Study is rated higher. OnePetri averages 3.0 out of 5 from 8 ratings, while Phage Study averages 5.0 from 1 ratings.

### Do OnePetri or Phage Study have ads?

Neither OnePetri nor Phage Study shows ads.

### Which is updated more often, OnePetri or Phage Study?

OnePetri ships an update every 6 months, and Phage Study every 5 months. Most recently, OnePetri was updated on October 15, 2026 and Phage Study on October 18, 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.*