JotBunker for iPhone is currently in closed TestFlight beta. To join, submit the email address your iPhone uses to sign in to the App Store — that's the only address Apple will let us add you under.
Once you're added (usually within a day or two), you'll get an invite email from TestFlight with a link to install the beta build.
We'll add you to TestFlight within a day or two. Watch your inbox for the invite from Apple.