OnePetri vs Phage Study
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OnePetri
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.
- AI-powered plaque detection
- Automated plaque counting
- Real-time assay calculations
- Local on-device image processing
- Supports bacteriophage assays
- Open-source code and dataset
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Harness the power of AI and accelerate common microbiological petri dish assays with OnePetri! Tired of manually counting plaques on petri dishes? Count plaques in near real-time with OnePetri, an automated plaque counting iOS app! OnePetri currently supports bacteriophage plaque-based assays, with support for bacterial CFU counts coming in a future release! === About OnePetri === OnePetri uses machine learning models & computer vision to automatically detect petri dishes and plaques, count plaques, and perform common assay calculations with these values (plaque/titration assay). Note that as of now, OnePetri only works with circular petri dishes; however, other shapes (square & rectangle) may be added if sufficient training images can be obtained. Additionally, the models used in the app require one plate per dilution, and as such, spot assays are not currently supported. All image processing & detection is done locally on-device, with no need for an internet connection once the app has been installed. As such, OnePetri does not collect, store, or transmit any user data or images. Updates are likely to be released regularly, so regular access to the internet is strongly recommended. === Plaque count accuracy & validation === There are no restrictions on how OnePetri is used; however, the models included in the app may occasionally miscount plaques (too many, or too few) and this could affect downstream experiments and calculations. As such, all counts done by the app should always be validated by manual counting or another established "gold standard", especially in cases where it is critical to know precise values (ie. phage titration for phage therapy). The model accuracy will improve with each release thanks to additional training data provided by the community. OnePetri is completely open source, with the initial training dataset and app source code publicly available! For more information on how to contribute to the app's codebase, please visit the OnePetri website (https://onepetri.ai).
Phage Study
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.
- Clinical study information
- Phage therapy details
- Multi-drug resistant infections
- Research updates
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Provide information regarding APT's clinical studies using phage to treat multi drug resistant infections.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | OnePetri | Phage Study |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.0 (8 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 8 — better | 1 |
| Update frequency | Every 6 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 9 MB | 59 MB |
| Age rating | 4+ | 17+ |
| Developer | Michael Shamash | Adaptive Phage Therapeutics, Inc |
Customer experience
OnePetri
Phage Study
In-app purchases
OnePetri
No in-app purchases
Phage Study
No in-app purchases









