CNO26 vs P51
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CNO26
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El Congreso Nacional de Oftalmología 2026 (CNO26) se llevará a cabo del miércoles 15 al viernes 17 de abril de 2026 en el Hotel Hilton de Buenos Aires, organizado por el Consejo Argentino de Oftalmología (CAO) y con el apoyo de todas las sociedades y cátedras del país. Destinado principalmente a médicos oftalmólogos de habla hispana, el CNO26 también convocará a instrumentadores, rehabilitadores visuales y administradores vinculados a la especialidad, y contará además con un amplio espacio de exposición comercial.
P51
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The P51 application is built by La Ruta del Clima thanks to the collaboration of NEXT, its objective is to generate information and knowledge about the effects of climate change from communities on various issues such as infrastructure, changes in the territory, effects on human rights, loss of species and territory, among others. Damage and loss respond to the negative outcome or consequences of Climate Change that have exceeded the limits of adaptation.Currently, many communities in developing countries have to live with these consequences and are not visible in decision-making spaces due to the lack of information and ignorance of these consequences in the daily lives of many people. It is for this reason that through this tool you can participate in the collection and recording of data that will help to demonstrate and modify the responses of various sectors such as planning, risk management and political spaces in the face of climate change. The greatest importance of using the application is that the first line of information gathering is you as users, who live daily the damages and losses in your communities and for this reason it is defined as a citizen science tool. This is how the collection of this information allows, through the analysis of the various reports, to define actions and repairs that respond to the communities. The P51 App is running on the SPOTTERON Citizen Science Platform at www.spotteron.net.
Screenshots
Verdict
The clearest difference is update cadence: P51 at every 2 weeks against CNO26's every 4 months. P51 also leads on iOS requirement (11.0 vs 15.1). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CNO26 ships an update every 4 months, P51 every 2 weeks. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.
| Parameter | CNO26 | P51 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 11.0 — better |
| Further details — not scored | ||
| Size | 32 MB | 45 MB |
| Age rating | 17+ | 17+ |
| Developer | Consejo Argentino de Oftalmología | SPOTTERON Gmbh |
In-app purchases
CNO26
No in-app purchases
P51
No in-app purchases









