Clear answers to the twelve questions people ask most before downloading the Dexcom G7 app. For interactive answers, see the home page FAQ.
1. What is the Dexcom G7 app?
The official companion app for the Dexcom G7 CGM system by DexCom, Inc. It receives a glucose reading from the sensor every 5 minutes and shows values, trend arrows, graphs and alerts on your phone and watch.
2. Is the app free?
Yes — free on Google Play and the App Store. You need a G7 sensor (prescription in the US) and a free Dexcom account.
3. Which phones are supported?
iPhone on iOS 18.6+ and Android 13+ on Dexcom-verified models. Full list: compatible phones & watches.
4. Does it work without internet?
Yes for readings — Bluetooth only. Internet is needed for Share/Follow, Clarity sync and backup.
5. How accurate is the G7?
Overall MARD of roughly 8.2% — among the best of any CGM, and approved for insulin dosing without confirmatory fingersticks.
6. How long does a sensor last?
Up to 10 days plus a 12-hour grace period (a 15-day version has been introduced in the US). Warmup is about 30 minutes.
7. Can family follow my readings?
Yes — up to 10 followers via the free Dexcom Follow app, each with their own alert settings.
8. What alerts can I set?
High/low thresholds, rise and fall rate, signal loss, and the predictive Urgent Low Soon warning (up to 20 minutes ahead). Quiet profiles adjust sounds by time of day.
9. Does it work with smartwatches?
Apple Watch connects directly to the sensor; supported Wear OS watches mirror the phone app.
10. G7 vs G6 — what changed?
60% smaller all-in-one sensor, 30-minute warmup, grace period, better accuracy and direct watch streaming. Full comparison: G7 vs G6.
11. How much does it cost?
The app is free; sensor cost depends on insurance and channel. Realistic numbers and savings options: cost & insurance guide.
12. Is this the official Dexcom website?
No — this is an independent guide. Download links point to the official store listings, and Dexcom G7 is a trademark of DexCom, Inc. For medical decisions, talk to your healthcare provider.
Still deciding? The Dexcom G7 app homepage has the full feature tour, comparison table and free download link.