DRYRIvERS vs BiciZen
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DRYRIvERS
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DRYRivERS was developed by DRYvER (https://www.dryver.eu/), which is a Horizon 2020 project, that aims to collect, analyse, and model data from drying river networks from all around the World. By using DRYRivERS, every smartphone user who enjoys nature and the outdoors can contribute to the mapping of drying rivers, and will help to improve scientific predictions of the future impacts of climate change in these ecosystems. The app is very easy to use, all you need to do is add (1) the location of the river site; (2) the in-channel conditions i.e., whether the channel contains flowing water, disconnected standing pools, or is dry; (3) a photo of the site. All the observations made by citizens with the DRYRivERS app will be openly accessible and visualized on DRYvER website (https://www.dryver.eu/app).
BiciZen
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BiciZen App aims to learn about urban mobility, public engagement, and cycling through a citizen science platform that empowers urban cyclists with relevant travel information and supports cities in their transition to a low-carbon mobility future. BiciZen allows you to share your cycling experiences and learn from other cyclists. You can share things such as where you feel safe or happy when cycling, where you found something obstructing your way that should be removed, where more cycling infrastructure would be needed, or even organize a bicibus to go to work or school with other cyclists. What we want is to create a space where you can share the nice spots and areas to cycle in your city so that other cyclists can enjoy them. We also want to allow you to report bad experiences and things that should be improved because if they are not recorded, they are usually not dealt with. And finally, we want to offer a space to propose and imagine how cities should be changed so that they are more friendly to bicycles and cyclists. The information collected through the app is available on the BiciZen website so that anybody can explore and learn using it. It will help cyclists improve their daily cycling routine, assist policymakers with direct feedback from the cycling community, and generate data for scholars who aim to inform urban mobility policy and learn about citizen science and public engagement processes. The BiciZen App is running on the SPOTTERON Citizen Science Platform.
Screenshots
Verdict
The clearest difference is update cadence: BiciZen at every 6 days against DRYRIvERS's every 2 months. 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.
DRYRIvERS ships an update every 2 months, BiciZen every 6 days. The most recent releases landed on September 30, 2026 and October 7, 2026 respectively.
| Parameter | DRYRIvERS | BiciZen |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 38 MB | 82 MB |
| Age rating | 4+ | 4+ |
| Developer | Z5 Plus Design Korlatolt Felelossegu Tarsasag | SPOTTERON Gmbh |
In-app purchases
DRYRIvERS
No in-app purchases
BiciZen
No in-app purchases





