I would rate this device with five stars but there a couple issue that I have with it.
I downloaded the app onto my MacBook Air with an M4 chip and the playback is not usable as the sound is filled with scratchy noise. I contacted Chip but was unable to correct the issue.
It would be extremely helpful to have an on line operating manual.
Other than those issues it is a great device in so many ways for players who want to capture their inspiration without needing to think about the recordings and any technology that can draw your focus away from what you are creating.

Jamcorder is a game changer. As a frequent improvisor, I’ve lost hundreds of improvisations I wish I had captured. With Jamcorder running seamlessly in the background, this is a thing of the past. The iPhone app and the accompanying web page are also rock solid.

The concept is perfect. It almost completely solves problems I've had with red light syndrome and capturing spontaneity. The app has a lot of great features and the developer is very active.

I've encountered a variety of tiny issues intermittently, but nothing game-breaking. Issues encountered include the Jamcorder randomly adjusting the time (mid-recording, even), the Share Start/End dialog force-scrolling repeatedly, and a few instances of glitchy behavior when recording (it once recorded thirty minutes of total silence between two sessions, and another time it believed two notes were held down indefinitely even as those notes were actively being played). I can't replicate any of these issues on the current version of the app/firmware, so perhaps they've been solved by now. I also can't rule out my device (a Yamaha CK61) potentially being culpable in any of these hiccups!

Still, a fantastic device. Invaluable for for spontaneous, unplanned capture.

JamCorder is amazing! I found you via HN and I love the philosophies behind it: Data hoarding, offline first, no cloud, somewhat hackable, efficient storage, ease of use. I'm very reluctant on buying ready-made hardware usually, but this honestly ticked all the boxes. Everything just works. So much attention to details, like the pentatonic startup sound, the colorful seamless firmware update, the app interface. I've been monitoring my progress from day one of learning piano, and looking back on it in a few years will be great. The app is intuitive and fast even on super-low end devices. Wish you made the apk available for direct download though. I don't use Google and had to resort to some weird proxy app store.
Thanks Chip!

I recently purchased the Jamcorder and I couldn’t be happier with my decision. The unit itself is absolutely awesome—solid build, intuitive design, and delivers exactly what I needed. Whether I’m recording ideas on the fly or jamming out for hours, it captures everything with clarity and makes the whole process effortless and fun.
What made the experience even better was the customer service. Chip went above and beyond to make sure everything went smoothly. He was responsive, knowledgeable, and genuinely cared about making sure I got the most out of my purchase. It’s rare to find that level of support these days, and it made a huge difference.
Bottom line: the Jamcorder is incredible, and Chip made the buying experience just as great as the product itself. Highly recommended!