This side-by-side review compares Dexcom G7 and FreeStyle Libre 3 on published accuracy, sensor wear, cost, AID compatibility, alerts, and app experience so you can match the device to your clinical needs and coverage.
This comparison covers the original 10-day Dexcom G7 and the original 14-day FreeStyle Libre 3. G7 15 Day and Libre 3 Plus are separate models; do not transfer accuracy figures or intended uses between versions. Confirm current specifications with the manufacturer and your prescriber.
Medical Disclaimer: This content is for informational purposes only. Always consult your healthcare provider before making health decisions.
Published MARD figures come from separate manufacturer studies and do not establish which device is more accurate. Choose a device based on the features you need with advice from your healthcare professional, and check manufacturers for current prices.
| Attribute | Dexcom G7 | FreeStyle Libre 3 |
|---|---|---|
| MARD accuracy | 8.2% adult arm | 7.8% ages ≥6, YSI |
| Sensor life | 10 days (15 days on newer G7 15 Day) | 14 days (15 days on newer Libre 3 Plus) |
| Reading interval | Every 5 min | Every 1 min |
| Calibration required | None | None |
| Warm-up time | 30 min | 60 min |
| Retail price/month | Check price | Check price |
| With insurance | Depends on plan | Depends on plan |
| Prescription required | Yes | Yes |
| Apple Watch display | Direct on compatible Apple Watch | Not established for original Libre 3 here |
| AID system compatibility | Check exact pump/software | Original Libre 3 is distinct from Plus |
| Waterproof rating | 8ft / 24hr | 1m / 30min |
| App | Dexcom G7 + Clarity | LibreLink + LibreLinkUp |
| Data sharing | Dexcom Follow: up to 10 | Check original Libre 3 app documentation |
| Sensor wear location (US) | Back of upper arm (ages 2+); upper buttocks also allowed for ages 2–6. Abdomen is not an approved G7 site in the US. | Back of upper arm only |
G7 vs Libre 3 vs every other device — with or without insurance.
Published MARD figures come from separate manufacturer studies and do not establish which device is more accurate. Choose a device based on the features you need with advice from your healthcare professional, and check manufacturers for current prices.
Published MARD figures come from separate manufacturer studies and do not establish which device is more accurate. Choose a device based on its intended use and the features you need with advice from your healthcare professional, and check manufacturers for current prices.
Retail prices are set by pharmacies and plans, so ask yours for both. With insurance, both devices are commonly covered for qualifying patients, which can reduce costs. If you have coverage for both, check your specific plan formulary — the insured cost difference may be minimal.
Without insurance, compare current pharmacy prices for both. See our full Dexcom cost without insurance guide and FreeStyle Libre cost guide for detailed pricing options.
For users on automated insulin delivery (AID) systems — closed-loop systems that automatically adjust basal insulin — compatibility depends on the pump and the sensor model. G7 is compatible with multiple AID platforms including Tandem Control-IQ, Omnipod 5, and others. Abbott's US compatibility page lists the FreeStyle Libre 3 Plus sensor, not the original Libre 3, for Omnipod 5, the t:slim X2 with Control-IQ+, the iLet and the twiist.
If you use or plan to use an AID system, check which CGMs your pump currently supports before choosing between these two.
Which closed-loop system you use decides which CGM and which sensor model you can pair. Abbott's US compatibility page lists the FreeStyle Libre 3 Plus sensor (not the original Libre 3) for Omnipod 5, the t:slim X2 with Control-IQ+, the iLet and the twiist, and Tandem states that the t:slim X2 is not compatible with the Libre 3 sensor. The Dexcom G7 works with Tandem and Omnipod 5 systems among others, so check your pump's current CGM list. G7 also gives direct Apple Watch display. If AID compatibility is not a factor, compare current prices and coverage for both.
Read full Dexcom G7 review →Published MARD figures come from separate manufacturer studies and do not establish which device is more accurate. Choose a device based on its intended use and the features you need with advice from your healthcare professional, and check manufacturers for current prices.
Read full FreeStyle Libre 3 review →Enter your own prices to compare calculated cost for your period.
Accuracy, cost, sensor life, and what each device is cleared for — all in one place.
Compare all CGM devices →Medical source review, 25 October 2026. Sources apply to their named models, populations and endpoints: Stelo FDA K260935; Original Libre 3, Alva 2023; Libre 3 Plus manufacturer kit, page 5; Guardian 4 FDA, table 17; Eversense E3 US IFU; Eversense 365 ENHANCE; Lingo FDA K233655; Abbott Lingo Count.