Trio was built by the open-source community as an evolution of iAPS (which itself forked from OpenAPS / FreeAPS X). Trio delivers advanced features designed for people who want more custom-control and safety built into their AID system. It’s algorithm and settings go well beyond the most popular open source app, DIY Loop.

What sets Trio apart is its combination of familiar, reliable open-source foundations with meaningful additions. It offers super micro boluses (SMBs), dynamic insulin sensitivity settings (Dynamic ISF), unannounced meal detection, and caregiver features for remote support. These aren’t just tweaks — they help users reliably stay in range, often over 80%, some without needing to bolus for meals!

Since it’s a community-built tool, there’s more setup involved than a commercial pump: users must build the app themselves, fine-tune basal/ISF settings, and stay active in the community for support. But for those who are willing, the payoff is powerful customization and transparency.

If you’re curious how Trio works in action — the redesigns, the responsiveness, the caregiver tools, and how real users are pushing it — I cover all that in my latest Diabetech podcast episode. Scroll down and watch the episode below or listen to the episode above to hear what makes Trio more than just another DIY APS system.

DISCLAIMER: This is not medical advice. Always consult with your medical team before making changes to your health care. DIY Loop is experimental and not approved by the FDA or regulatory authorities. You take full responsibility for building and using open source systems and you do so at your own risk. Results will vary.