No hype, no guru culture. Two years of my own WHOOP data on HRV, sleep and recovery — plus sourced, clearly labelled analyses of smart rings and CGMs I have not tested myself.
The Libre app is free and works with iPhones iOS 16.0+ and Android phones 11+. Which models exactly fit, how to reinstall the app, and what happens to your running sensor when you switch phones – plus troubleshooting for connection errors. Last updated 25.10.2026.
The Libre 3 Plus lasts up to 15 days and costs self-payers €70.60 per sensor from Abbott Germany. How it differs from the Libre 3, when German health insurance pays, which phones and pumps work, and how to check the recall. As of 23 Oct 2026.
Garmin Cirqa in S–M (120–200 mm) or L–XL (145–240 mm)? How to measure your wrist, what applies in the overlap range, what the upper arm band needs, and price and delivery time in Germany. No subscription needed. As of 18 Oct 2026.
Garmin sells three fitness bands in Germany: Cirqa (€199.99, screenless), vívosmart 5 (€149.99, with display) and the Index Sleep Monitor (€159.99, sleep only). What they measure, what they cost, how fast they ship and why none needs a subscription. As of 18 Oct 2026.
The Oura Ring 4 currently costs €265.30 instead of €379 in Oura's German store. What the membership adds, what remains without it, which sizes exist and when the Ring 5 is the better pick. As of 18 Oct 2026.
Garmin Cirqa (€199.99, no subscription) vs. Fitbit Air (€99.99, Premium optional): battery life per manufacturer and per reviews, sensors, three-year subscription costs and availability in Germany. As of 17 Oct 2026.
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