Three major open-source closed-loop systems are in active use in 2026: Loop (iOS), AndroidAPS (Android), and iAPS (iOS, derived from OpenAPS). Each has different hardware requirements, algorithm approaches, and community support. Here is the comparison.
Loop (iOS)
- Platform: iPhone only
- Algorithm: OpenAPS-derived, with Loop-specific modifications
- Compatible pumps: Omnipod DASH, Omnipod 5 (in development), older Medtronic
- Compatible CGMs: Dexcom G6, G7, FreeStyle Libre (via LibreTransmitter)
- Ease of setup: Medium — requires Mac for compilation or TestFlight beta
- Community: Large, primarily US-based, LoopDocs documentation excellent
AndroidAPS
- Platform: Android only
- Algorithm: OpenAPS algorithm with SMB (Super Micro Bolus) capability
- Compatible pumps: DANA-i/RS, Omnipod DASH, Combo, several Medtronic models
- Compatible CGMs: Dexcom, Libre 2/3, Eversense, most with xDrip+ as bridge
- Ease of setup: Harder than Loop — more options, longer objective system
- Community: Large, global, very active Facebook groups
iAPS (iOS)
- Platform: iPhone only
- Algorithm: Oref1 (OpenAPS) with Autotune and more aggressive automation options
- Compatible pumps: Omnipod DASH, Medtronic
- Ease of setup: Similar to Loop
- Distinguishing feature: Autotune automatically adjusts basal rates and ISF over time
How to Choose
- Have an iPhone + Omnipod DASH: Loop or iAPS (iAPS if you want more automation)
- Have Android + DANA pump: AndroidAPS
- Have Android + Omnipod: AndroidAPS
- New to DIY closed-loop: Loop has the best beginner documentation
All three systems are not FDA approved. They require informed user decisions and medical supervision. Research thoroughly before starting.