b-d.io / Devices
Smart glasses for developers: what each pair lets your app do
Not the spec sheet — what a third-party phone app can actually do with each pair, as we measured it.
| Even G2 | RayNeo iO | Meta Ray-Ban Display | |
|---|---|---|---|
| US price | $599 | $499 | $799 |
| Display | Both lenses | Yes | Right lens |
| Your own layout | Yes — 576×288 text canvas | No — template screen | Yes — through Meta's view primitives |
| Update limits | Replace text in place; one update per tick | Captions session; ~0.5 s cadence | We throttle to 0.35 s |
| Mic to your app | Yes — LC3 | Opus 16 kHz; long streams unverified | Experimental only (not for shipping apps) |
| Touch to your app | Yes, with arm source | No | Experimental |
| Camera | No | No | Yes |
| Way in | Community BLE protocol (official: Even Hub SDK in a WebView) | No SDK for iO; own BLE code | Official Wearables Device Access Toolkit |
| Gotchas | Must be bonded or it drops in ~29 s; one connection at a time | Lens must be on; must be bound to the official app first | Not yet tested on physical glasses by us |
Which one should you build on?
- You want full control of the lens (your own layout, scrolling, split screens): Even G2.
- You want a supported, documented API and can live with Meta's primitives: Meta Ray-Ban Display.
- You only need captions on the glasses' own caption screen: RayNeo iO can work.
Prices are US list prices as of October 2026. Missing a device? Tell us what you measured.