Google Invites Anyone to Build Accessories for the Fitbit Air

Despite its minimalist form, the sensor suite is comprehensive. It supports 24/7 heart rate monitoring, heart rhythm monitoring with irregular rhythm notifications (including Afib alerts), SpO2 blood oxygen tracking, resting heart rate, heart rate variability (HRV), skin temperature variation, sleep stages, and automatic activity tracking . The device pairs with the new Google Health app, which replaced the Fitbit app on May 19, 2026, and works on both Android 11+ and iOS 16.4+ . Battery life is rated for up to seven days .

Color options include Obsidian, Lavender, and Berry, while the Stephen Curry Special Edition arrives at $129.99 .

Maker Community Already in Motion

Google acknowledged that even before the blueprint release, the “community has already come up with innovative and creative new ideas to make the Fitbit Air [their] own” — for instance, owners quickly found their own bicep band solutions . The official CAD release gives those early experiments a firm engineering foundation, enabling makers to design and 3D print accessories with confidence that sensors will remain properly exposed and the device will stay securely attached . The design specs even mandate specific attachment forces (10–25 N to insert, 12–45 N to remove) to ensure reliability during intense activity .

Why Open Access Is a Radical Shift in Wearables

Most major wearable brands — Apple, Samsung, Garmin, and even traditional Fitbit lines — treat accessory design as a proprietary, licensed ecosystem. Makers typically have to reverse-engineer mechanical mounts or operate under closed licensing programs with NDAs and fees. Google’s decision to release raw 2D CAD files with precise engineering tolerances for free, less than a month after the product’s launch, is almost unheard of at this scale in consumer wearables .

Observers described the move as “rather Google-y and reminiscent of the company’s earlier days,” echoing the open, hacker-friendly ethos that characterized the Nexus program and the later open-sourcing of PebbleOS . By releasing these blueprints, Google is effectively treating the Fitbit Air less as a closed gadget and more as an open platform — and it’s watching to see what the community builds next.