Qardio
QardioArm A100
$99.95
Best Blood Pressure Monitors · head-to-head
QardioArm A100 vs iHealth Track KN-550BT
A sourced, side-by-side comparison. iHealth Track KN-550BT is cheaper at $39.99. Every spec and price links to its source.
iHealth
iHealth Track KN-550BT
$39.99Cheaper
Released 2016
Which is better: the QardioArm A100 or iHealth Track KN-550BT?
On the specs we track, they're closely matched. The iHealth Track KN-550BT is the cheaper at $39.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | QardioArm A100 | iHealth Track KN-550BT |
|---|---|---|
| US price | $99.95 | $39.99 |
| Brand | Qardio | iHealth |
| Released | — | 2016 |
| Type | upper_arm | upper_arm |
| Cuff range (in) | 8.7–14.6 in | 8.6–18.9 in |
| Memory readings | — | 99 |
| User profiles | — | 1 |
| Bluetooth app | Yes | Yes |
| Irregular heartbeat detection | Yes | Yes |
| Clinically validated | Yes | Yes |
| Release | — | 2016 |
Sources — QardioArm A100: medgrade.org (verified 2026-06-19). iHealth Track KN-550BT: medgrade.org (verified 2026-06-19).
What's the difference between the QardioArm A100 and iHealth Track KN-550BT?
Where the two actually differ on the specs we track (1 of 7). Matching specs are omitted.
- Cuff range (in): QardioArm A100 8.7–14.6 in vs iHealth Track KN-550BT 8.6–18.9 in
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
QardioArm A100
Only one whitelisted tester with a readable hands-on page covered the QardioArm: TechRadar's 2015 iPhone-Health walkthrough, which found it easy to use with a convenient one-piece design and an optional triple-averaged reading mode. No accuracy benchmarks were published. (1 sourced review.)
Praised: Easy to use — the cuff powers on when unwrapped and readings start from the app; Convenient one-piece cuff design, with no detachable electronics to reattach mid-measurement; Optional triple measurement with 30-second gaps averages readings for better accuracy.
iHealth Track KN-550BT
Thin coverage: only Wirecutter's fetchable text covers this exact model, and it is negative — in hands-on testing the iHealth Track "produced inconsistent readings in our tests," so it missed their picks. TechGearLab's page was unreachable during harvest, and Consumer Reports, Forbes Health, and MedGrade fall outside the genuine-tester whitelist. Treat this single-source verdict cautiously. (1 sourced review, 1 lab-tested.)
Flagged: Inconsistent readings in Wirecutter's hands-on testing kept it out of their recommended picks.