Multi vs OnePetri
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Multi
This app offers multiple stopwatches with advanced features like parallel or sequential timing modes. It's designed for tracking multiple events or participants simultaneously, with customizable displays and background operation for accurate timing.
- Multiple stopwatches
- Parallel and Sprint modes
- Customizable display options
- Background operation
- Apple Watch support
- Haptic feedback
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Multi-Stopwatch extends your normal stopwatch with many useful additional functions. Multiple stopwatches • Stop several times simultaneously • Use the 2 modes "Normal" and "Sprint". In "Normal" mode the stopwatches run in parallel. In "Switch" mode only one stopwatch runs at a time. If another stopwatch is started, the previous one pauses automatically. Sprint Mode • You want to track many runners, swimmers? Then the sprint mode is perfect for you • The large buttons and the haptic feedback help to operate without having to look at the iPhone Platforms • In addition to the iPhone app, Multi-Stopwatch is now also optimized for your iPad • Use Multi-Stopwatch now on your Apple Watch Customizability • Adjust the multi-stopwatch exactly to your needs • Need a bigger toolbar? Do you want the times to be displayed to the nearest second? You can set it now • You want to show the number of rounds and the last round, hide the name for it? You can set it now • When you tap on the stopwatch, you don't want to stop the time but see details? You can set it now Of course, the stopwatches also run in the background with millisecond accuracy. Perfect e.g. for sports teachers, doctors, time recording, DLRG, races and much more. Subscription terms: - The subscription auto-renews at the end of each term. - Payment will be charged to iTunes Account at confirmation of purchase. - The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period. - You may manage your subscription and turn off auto-renewal by going to your Account Settings after purchase. Privacy policy and Terms of Use: https://applorium.com/privacy-multi-stopwatch
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).
Screenshots
Verdict
The clearest difference is price: Multi at Free against OnePetri's $0.99. Multi also leads on rating (4.5 vs 3.0) and update cadence (every 2 weeks vs every 6 months). OnePetri's advantage is in-app purchases (none vs 8) and iOS requirement (13.0 vs 16.0). On ads 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
Multi is free to download; OnePetri costs $0.99 up front. Multi sells 8 in-app purchases, starting at $3.99 per month. OnePetri asks for nothing beyond the download.
Multi holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Multi has 697 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 64% of Multi's written reviews are positive against 50% of OnePetri's.
Multi ships an update every 2 weeks, OnePetri every 6 months. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.
| Parameter | Multi | OnePetri |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.5 (697 ratings) — better | 3.0 (8 ratings) |
| Positive reviews | 63.6% of reviews — better | 50.0% of reviews |
| Number of ratings | 697 — better | 8 |
| Update frequency | Every 2 weeks — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | Paid — better |
| Devices | iPhone, iPad, Mac, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Applorium Ltd | Michael Shamash |
Customer experience
Multi
OnePetri
In-app purchases
Multi
- Monthly3 Days trial$3.991 Month
- Multi-Stopwatch Pro3 Days trial$3.991 Month
- Multi-Stopwatch pro3 Days trial$9.991 Year
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- Yearly3 Days trial$19.991 Year
- Remove Ad$0.99
- Stopwatch Pro$5.99
- Multi Stopwatch Pro$19.99
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- Multi Stopwatch Pro$39.99
OnePetri
No in-app purchases









