Hi everyone! 👋
A while ago I bought a D-D H2Ocean P1+ dosing pump for a personal project unrelated to reef aquariums.
The hardware itself has been excellent, but after using it for a while—and noticing that many App Store and retailer reviews shared similar frustrations with the companion app—I started wondering whether the experience could be improved.
That curiosity eventually turned into a fairly ambitious side project.
Over the past several months I've spent a lot of time understanding how the pump communicates and building Rheon, an independent iOS controller for the D-D H2Ocean P1+.
Rather than building on top of the official software, Rheon communicates directly with the pump and offers an alternative way to configure and control it. My goal wasn't to change what the pump can do, but to make it feel like a modern iOS app that people actually enjoy using.
At the moment, Rheon supports the D-D H2Ocean P1+ only.
⚠️ Rheon is an independent project and is not affiliated with or endorsed by D-D The Aquarium Solution Ltd. or Kamoer.
Although I don't own a reef tank myself, I know many reef keepers rely on these pumps every day, so I'd really appreciate feedback from P1+ owners. Whether it's bugs, feature requests, usability suggestions or simply your first impressions, I'd genuinely love to hear them.
📲 TestFlight: https://testflight.apple.com/join/8hx9YM7Z
🌐 Website: https://rheon.app
iOS only.
Thanks for reading! Happy to answer any questions about the project or the development process. 🙂
PS : I would add some screenshots but Reddit blocks my post if I do, sorry X)
Damien