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Fourth Frontier
Fourth Frontier Frontier X2
$579
Best Portable Ecg Monitors · head-to-head
Fourth Frontier Frontier X2 vs SonoHealth EKGraph Portable EKG Monitor
A sourced, side-by-side comparison. SonoHealth EKGraph Portable EKG Monitor is cheaper at $79. Every spec and price links to its source.
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SonoHealth
SonoHealth EKGraph Portable EKG Monitor
$79Cheaper
Which is better: the Fourth Frontier Frontier X2 or SonoHealth EKGraph Portable EKG Monitor?
On the specs we track, they're closely matched. The SonoHealth EKGraph Portable EKG Monitor is the cheaper at $79.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Fourth Frontier Frontier X2 | SonoHealth EKGraph Portable EKG Monitor |
|---|---|---|
| US price | $579 | $79 |
| Brand | Fourth Frontier | SonoHealth |
| Released | — | — |
| Leads | 1 (continuous single-lead ECG resembling the V5 12-lead position) | 1 (selectable Lead I or Lead II) |
| Recording duration | Up to 24 hours of continuous ECG recording per session | 30 seconds |
| Afib detection | — | Yes |
| Fda clearance | FDA 510(k) cleared (device itself is marketed as wellness, not diagnostic, per its own disclaimer) | FDA 510(k)-cleared |
| Bluetooth | Yes | Yes |
| Display | None; chest-strap wearable with no on-device screen, data reviewed via app/web dashboard | Built-in LCD with instant on-device classification |
| Onboard storage | Onboard memory chip records data with no phone connection required, described as 'zero data loss' | — |
| Battery | Up to 14 days on typical use (~1 hour of ECG recording per day) | — |
| Companion app | Frontier X app (live dashboards, trends, workout history) plus a web dashboard | SonoHealth app (iOS/Android) with free unlimited cloud storage and PDF report export |
Sources — Fourth Frontier Frontier X2: fourthfrontier.com (verified 2026-08-05). SonoHealth EKGraph Portable EKG Monitor: sonohealth.com (verified 2026-08-05).
What's the difference between the Fourth Frontier Frontier X2 and SonoHealth EKGraph Portable EKG Monitor?
Where the two actually differ on the specs we track (5 of 9). Matching specs are omitted.
- Leads: Fourth Frontier Frontier X2 1 (continuous single-lead ECG resembling the V5 12-lead position) vs SonoHealth EKGraph Portable EKG Monitor 1 (selectable Lead I or Lead II)
- Recording duration: Fourth Frontier Frontier X2 Up to 24 hours of continuous ECG recording per session vs SonoHealth EKGraph Portable EKG Monitor 30 seconds
- Fda clearance: Fourth Frontier Frontier X2 FDA 510(k) cleared (device itself is marketed as wellness, not diagnostic, per its own disclaimer) vs SonoHealth EKGraph Portable EKG Monitor FDA 510(k)-cleared
- Display: Fourth Frontier Frontier X2 None; chest-strap wearable with no on-device screen, data reviewed via app/web dashboard vs SonoHealth EKGraph Portable EKG Monitor Built-in LCD with instant on-device classification
- Companion app: Fourth Frontier Frontier X2 Frontier X app (live dashboards, trends, workout history) plus a web dashboard vs SonoHealth EKGraph Portable EKG Monitor SonoHealth app (iOS/Android) with free unlimited cloud storage and PDF report export