The two most widely prescribed CGMs in 2026 head to head. Both are factory-calibrated, prescription-only devices — but they differ meaningfully on accuracy, sensor life, cost, and AID compatibility.
Medical Disclaimer: This content is for informational purposes only. Always consult your healthcare provider before making health decisions.
FreeStyle Libre 3 wins on accuracy and cost. Dexcom G7 wins on AID system compatibility and Apple Watch integration. For most users without AID systems, the Libre 3 is the better value at ~$130/month vs G7's ~$350/month retail.
| Attribute | Dexcom G7 | FreeStyle Libre 3 |
|---|---|---|
| MARD accuracy | 8.2% | 7.9% |
| Sensor life | 10 days | 14 days |
| Reading interval | Every 5 min | Every 1 min |
| Calibration required | None | None |
| Warm-up time | 30 min | 60 min |
| Retail price/month | ~$350 | ~$130 |
| With insurance | Often $0–50 | Often $0–40 |
| Prescription required | Yes | Yes |
| Apple Watch display | Yes — direct | Via iPhone only |
| AID system compatibility | Broad (multiple systems) | Limited |
| Waterproof rating | 8ft / 24hr | 1m / 30min |
| App | Dexcom G7 + Clarity | LibreLink + LibreLinkUp |
| Data sharing | Dexcom Follow (unlimited) | LibreLinkUp (up to 20) |
| Sensor wear location | Arm or abdomen | Back of upper arm only |
G7 vs Libre 3 vs every other device — with or without insurance.
FreeStyle Libre 3 posts a MARD of 7.9% versus the Dexcom G7's 8.2% — a small but consistent difference in clinical trials. More significantly, Libre 3 reads every minute (versus every 5 minutes for the G7), giving a smoother, more granular glucose curve that better captures rapid post-meal rises and drops.
In practice, both devices are highly accurate for clinical decision-making. The MARD gap becomes most relevant in edge cases — rapid glucose fluctuations, hypoglycemic ranges, and situations where trending accuracy matters most. For most users, the difference is not clinically significant.
At retail, Dexcom G7 costs approximately $350/month versus $130/month for FreeStyle Libre 3 — a $220/month difference. With insurance, both devices are commonly covered for qualifying patients, often reducing costs to $0–50/month. If you have coverage for both, check your specific plan formulary — the insured cost difference may be minimal.
Without insurance, Libre 3 is substantially cheaper. 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 — Dexcom G7 is the clear choice. G7 is compatible with multiple AID platforms including Tandem Control-IQ, Omnipod 5, and others. FreeStyle Libre 3 has limited AID compatibility as of 2026.
If you use or plan to use an AID system, Dexcom G7 is the only practical choice of these two.
Tandem Control-IQ, Omnipod 5, and most other closed-loop systems require Dexcom. G7 also gives direct Apple Watch display and broader wear location options. If AID compatibility is not a factor, Libre 3 offers better value.
Read full Dexcom G7 review →Libre 3 posts the best published accuracy of any prescription CGM (7.9% MARD), reads every minute, lasts 14 days, and costs $220/month less at retail. For most users not on AID systems, it is the stronger value choice.
Read full FreeStyle Libre 3 review →Every device side by side — 30, 90, or 365 days.
Accuracy, cost, sensor life, and who each device is best for — all in one place.
Compare all CGM devices →