Updated 2026-05-04 · Auditor: Tomás Maria Vaz de Noronha · Methodology: 3-pass forensic
| Fitbit Charge 6 | SHR K3 Smart Ring (Ainode) | |
|---|---|---|
| Price | €159+ | €129 |
| Subscription | Fitbit Premium €8.99/mo for full metrics | None |
| Manufacturer HQ | Mountain View, CA, USA (Google subsidiary) | China (audited) |
| Independent privacy audit | Not in any public audit corpus | Tier C (audited) score 51/100 |
| Auditor's finding | — | Health data shared with US servers — documented and disclosed to the user. |
| Public PCAP report | Not published | /audits/shr-k3 |
| Methodology disclosure | Vendor privacy policy only | Full 3-pass methodology + 6-dimension scoring |
| Where to buy | https://www.fitbit.com/global/eu/legal/privacy-policy | /shop/shr-k3-smart-ring |
Health data shared with US servers — documented and disclosed to the user.
Tier: C (score 51/100). Date audited: 2026-04-29. Auditor: Tomás Maria Vaz de Noronha. License: CC-BY-4.0. Methodology: 3-pass forensic network audit (DNS analysis + traffic surveillance + 6-dimension classification).
Full audit page → · All public PCAP reports →
The Fitbit Charge 6 is not in Ainode's audit corpus. We don't make privacy claims about devices we haven't physically tested. We cite the vendor's stated practices and (where available) third-party reviews like Mozilla Privacy Not Included.
If you'd like Ainode to audit a specific device for your own use case, contact andre.mendonca@ainode.info.
Ainode sells the SHR K3 Smart Ring (€129). This page contains affiliate-style internal links to our shop. We do not sell the Fitbit Charge 6 and have no commercial interest in its sales — we link to the manufacturer for completeness only.