# OnePetri vs CountThings By Camera

The clearest difference is price: CountThings By Camera at Free against OnePetri's $0.99. CountThings By Camera also leads on rating (4.5 vs 3.0) and review sentiment (83% vs 50%). OnePetri's advantage is in-app purchases (none vs 11). On ads, device support and iOS requirement there is nothing between them.

CountThings By Camera is free to download; OnePetri costs $0.99 up front. CountThings By Camera sells 11 one-off in-app purchases. OnePetri asks for nothing beyond the download.

CountThings By Camera holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: CountThings By Camera has 41 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 50% of OnePetri's written reviews are positive against 83% of CountThings By Camera's.

OnePetri ships an update every 6 months, CountThings By Camera every 5 weeks. The most recent releases landed on October 15, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | OnePetri | CountThings By Camera |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.0 (8 ratings)](https://appshunter.io/ios/app/onepetri/id1576075754/reviews) | **[4.5 (41 ratings)](https://appshunter.io/ios/app/countthings-by-camera/id1627219849/reviews)** |
| Number of ratings | 8 | **41** |
| Positive reviews | 50.0% of reviews | **82.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 9 MB | 15 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Michael Shamash](https://appshunter.io/developer/604696747) | [长松 孙](https://appshunter.io/developer/1626925849) |

## 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


### CountThings By Camera

[App page](https://appshunter.io/ios/app/countthings-by-camera/id1627219849)

This app uses AI and computer vision to automatically count items in photos. It offers a vast template library, supports both new photos and existing albums, and provides manual correction for accuracy. It can count various items simultaneously, even in complex backgrounds.

**Highlights:** AI-powered item counting, Extensive template library, Photo and album input, Area selection for accuracy, Manual correction, History records, Multi-item and multi-class statistics

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

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 times card | $0.99 | one-time |
| day card | $1.99 | one-time |
| 100 times card | $4.99 | one-time |
| monthly card(30 times per day) | $4.99 | one-time |
| month card(100 times per day) | $5.99 | one-time |
| annual card(30 times per day) | $14.99 | one-time |
| month card(300 times per day) | $19.99 | one-time |
| 1000 times card | $29.99 | one-time |
| annual card(100 times per day) | $29.99 | one-time |
| monthly card | $29.99 | one-time |
| annual card(300 times per day) | $79.99 | one-time |


## Frequently asked questions

### Is OnePetri free?

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

### Is CountThings By Camera free?

CountThings By Camera is free to download, with in-app purchases available.

### Which has better reviews, OnePetri or CountThings By Camera?

CountThings By Camera is rated higher. OnePetri averages 3.0 out of 5 from 8 ratings, while CountThings By Camera averages 4.5 from 41 ratings.

### Do OnePetri or CountThings By Camera have ads?

Neither OnePetri nor CountThings By Camera shows ads.

### Which is updated more often, OnePetri or CountThings By Camera?

OnePetri ships an update every 6 months, and CountThings By Camera every 5 weeks. Most recently, OnePetri was updated on October 15, 2026 and CountThings By Camera on October 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*