Besides looking good, this app does exactly what it set out to do. It’s lets you set “atomic clocks”, the radio controlled and radio synced clocks that should auto set themselves, but appear to never be able to get a signal. On the phone, I struggled to get it to work, though others online had better experiences with earphones/headphones (big magnets, the cable acting as signal spreader) and some say even an AirPod can work. I had better experiences with an iPad, but mostly because the speaker is larger. You may also find placing the clock on a poorly shielded Bluetooth speaker might work well also. Turning volume up all the way is needed: I think you need to hear the clicks to make sure enough signal is generated. The sound itself doesn’t really matter, it just implies that a strong enough current is being sent to move the magnet at the right frequency and can get to the antenna of the clock.It takes a while. Be willing to wait 7-10 minutes get the sync to complete. The app supports almost every major radio signal format for time that my various watches and clocks expect, including US, Germany, and Japan. Very nice app! Rare to have one just do what it says it will do.

I live in the South Pacific and brought my group of atomic clocks so I could could keep up on times around the world. This app solved my alignment problem and saved me several hundred usd for an “old school” signal generator which seems to fail every 3-5 years. Works perfectly on one or two clocks at a time because they have to be super close to the iPad or iPhone. This is the only drawback that you can’t turn on the generator and align all the clocks on the wall.

I recently purchased a citizen radio watch but haven’t managed to get a radio signal in 3 weeks. I live in the north east in a very dense metro so I was trying to plan an opportunity in the mountains to get it some signal. Then i found about about this app on Reddit and it really works! The first couple of times it didn’t cast a strong enough signal from my phone but I set my watch infront of my iPad and it got the signal. Brilliant!

The app is well designed functionally and aesthetically. It works for my Casio Oceanus 5701 module. I have to place it so that either the bottom speaker or the ear speaker is firing directly into the bottom of my watch. Really convenient for when you can’t access radio reception or don’t want to set it manually. It seems to use the system time, so check that’s accurate.