No photo yet
AliveCor
AliveCor KardiaMobile
$79Cheaper
Best Portable Ecg Monitors · head-to-head
AliveCor KardiaMobile vs Fourth Frontier Frontier X2
A sourced, side-by-side comparison. AliveCor KardiaMobile is cheaper at $79. Every spec and price links to its source.
No photo yet
Fourth Frontier
Fourth Frontier Frontier X2
$579
Which is better: the AliveCor KardiaMobile or Fourth Frontier Frontier X2?
On the specs we track, they're closely matched. The AliveCor KardiaMobile is the cheaper at $79.
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | AliveCor KardiaMobile | Fourth Frontier Frontier X2 |
|---|---|---|
| US price | $79 | $579 |
| Brand | AliveCor | Fourth Frontier |
| Released | — | — |
| Leads | 1 | 1 (continuous single-lead ECG resembling the V5 12-lead position) |
| Recording duration | 30 seconds | Up to 24 hours of continuous ECG recording per session |
| Afib detection | Yes | — |
| Fda clearance | FDA-cleared to detect AFib, bradycardia, tachycardia, and normal sinus rhythm | FDA 510(k) cleared (device itself is marketed as wellness, not diagnostic, per its own disclaimer) |
| Bluetooth | No | Yes |
| Display | None on device; results shown live in the Kardia smartphone app | None; chest-strap wearable with no on-device screen, data reviewed via app/web dashboard |
| Onboard storage | — | Onboard memory chip records data with no phone connection required, described as 'zero data loss' |
| Battery | 1x CR2016 coin-cell (manufacturer-rated ~15 months of typical use, per AliveCor support documentation) | Up to 14 days on typical use (~1 hour of ECG recording per day) |
| Companion app | Kardia app (iOS/Android) | Frontier X app (live dashboards, trends, workout history) plus a web dashboard |
Sources — AliveCor KardiaMobile: kardia.com (verified 2026-08-05). Fourth Frontier Frontier X2: fourthfrontier.com (verified 2026-08-05).
What's the difference between the AliveCor KardiaMobile and Fourth Frontier Frontier X2?
Where the two actually differ on the specs we track (7 of 9). Matching specs are omitted.
- Leads: AliveCor KardiaMobile 1 vs Fourth Frontier Frontier X2 1 (continuous single-lead ECG resembling the V5 12-lead position)
- Recording duration: AliveCor KardiaMobile 30 seconds vs Fourth Frontier Frontier X2 Up to 24 hours of continuous ECG recording per session
- Fda clearance: AliveCor KardiaMobile FDA-cleared to detect AFib, bradycardia, tachycardia, and normal sinus rhythm vs Fourth Frontier Frontier X2 FDA 510(k) cleared (device itself is marketed as wellness, not diagnostic, per its own disclaimer)
- Bluetooth: AliveCor KardiaMobile false vs Fourth Frontier Frontier X2 true
- Display: AliveCor KardiaMobile None on device; results shown live in the Kardia smartphone app vs Fourth Frontier Frontier X2 None; chest-strap wearable with no on-device screen, data reviewed via app/web dashboard
- Battery: AliveCor KardiaMobile 1x CR2016 coin-cell (manufacturer-rated ~15 months of typical use, per AliveCor support documentation) vs Fourth Frontier Frontier X2 Up to 14 days on typical use (~1 hour of ECG recording per day)
- Companion app: AliveCor KardiaMobile Kardia app (iOS/Android) vs Fourth Frontier Frontier X2 Frontier X app (live dashboards, trends, workout history) plus a web dashboard