When we published @kumbatio/energy-system, the honest caveat was that only kumbat.io ran on it. That caveat is gone. The SDK is now in production in two real applications - one a Kumbatio product, one built entirely outside the Kumbatio product line.
Anasa is in public alpha
Anasa, our local-first writing and thinking workspace, is out of waitlist and into public alpha at anasa.md - macOS, Windows, and Linux. Its whole shell adapts to your reported energy level: AI surfaces scale down as energy drops, notifications are filtered by level, task suggestions respect a complexity ceiling, and the energy battery is a first-class control. It also does something the SDK doesn't: it records energy readings over time, on-device, and learns your hour-of-day patterns well enough to suggest a level with a stated confidence.
Meltemi - the first integration outside the ecosystem
Meltemi is an email client in private beta from entro314 labs, the studio behind Kumbatio. Full disclosure: same makers - this isn't an independent-adoption story. What it is: proof the SDK stands alone, because Meltemi is built outside the Kumbatio product line and adopts nothing from the ecosystem except the package. It uses the parts of the SDK we most wanted tested in anger: the notification gate holds mail arrivals at low energy and releases them as a single quiet catch-up - defer, never drop - while focus sessions, energy-aware snooze ordering, and a bigger undo-send window at low capacity all come from the same engine. It integrated at 0.4.0 and upgraded to 0.5.3 without touching a line of its integration code.
What survived contact with real use
Both apps taught us things the docs didn't say yet - how to hold the engine without the React adapter, how to build custom persistence without creating write loops, why the level control must never dim with the chrome it controls, and why energy should gate the AI you didn't ask for but never the AI you did. We wrote it all down: Production Patterns is the case study the roadmap promised.
If you ship something on energy-system, tell us - adopters with real features get the loudest voice. And if any of this is unclear - especially when you're tired - that's a bug. Tell us.