The Works with Google Cardboard (WWGC) certification helps your viewer get traction by letting users know that your VR viewer works with Cardboard apps and games.
In order to be accepted into the Works with Google Cardboard program, you’ll need to submit prototypes of your VR viewer to Google for review to ensure that it meets Works With Google Cardboard guidelines. If it does, you'll receive a Works with Google Cardboard badge to display on your viewer, your website, and in promotional materials; this way, users can easily identify that they can use your viewer to experience Cardboard’s full range of available VR apps.
In order to be considered for the WWGC program, your device must pass a number of different quality standards. Once you’ve double-checked that your device meets all of these standards, you’re ready to apply for Works with Google Cardboard certification.Audiences
- Refrain from promoting and recommending Cardboard-like viewers to kids without conducting additional testing.
- If your viewer is made out of cardboard, make sure that your audiences understand the limitations of the material: not water-resistant, potentially combustible (especially if lenses are facing a strong light source), limited life span.
- Your viewer should contain exactly one input. If your viewer has affordances for a direct screen touch, ensure that there is at most one dedicated area for touching the screen.
- Your viewer can use different types of inputs, from a simple smartphone screen touch, conductive and capacitive inputs, to Bluetooth-based buttons, and so on.
- If you’re using a conductive input which passes user’s body charge onto the smartphone screen, ensure that the input is not touching the screen in a “non-pressed” state.
- You can use various materials for the viewer enclosure: cardboard, plastic, foam, aluminum and so on.
- An enclosure which fully blocks ambient/stray light is not mandatory. Lightweight forms of VR viewers with partial enclosures which do not necessarily block all ambient light may still work with Google Cardboard software ecosystem.
- If you’re using cardboard for the enclosure, use the corrugated E-flute cardboard sheets. Flute thickness should not be less than 0.06” (1.5mm), otherwise the viewer itself will become unstable. This typically manifests in bending when opening/closing the top flap or side flaps.
- Similarly, if you’re using cardboard for the lens plate, apply food grade varnish or stickers to the cardboard to minimize unattractive staining on it, since it will be in frequent contact with skin.
- If your viewer is using custom lenses, it may still be fully compatible with the Google Cardboard ecosystem. Just make sure to create a viewer profile to correct for lens barrel or pincushion distortion using the viewer profile generator as described in Viewer Profile section.
- If you’re designing custom lenses from scratch, aim for wide eyebox and avoid a mechanical inter-lens/IPD adjustment.
- If you’re facing a trade-off between the FOV and the eyebox size, err on the side on the more forgiving eyebox.
- Google Cardboard uses 34 mm diameter aspherical singlet lenses.
- If your viewer is using strips of adhesive-backed hook and loop fastener for flaps, make sure that the adhesive is sufficiently strong not to loosen from the viewer over time, as the strips will be getting a lot of use.
- Ensure that the phone cannot easily slide out from the viewer. For example, you can use the rubber band or rubber dots to increase the friction between the phone and the viewer.
- If your viewer is made out of cardboard and has print assembly instructions on both sides, avoid designs that require perfect alignment on both sides. Also leave sufficient margins (1/4” - 1/8”) between the print patterns and the die-cut lines.
To ensure that all apps in the Google Cardboard app ecosystem work great on your viewer, create a QR viewer profile for your device using the viewer profile generator.
Please make sure the QR code that’s generated for your Viewer Profile is visible on the device you send in for review, and/or the device packaging.
You can also access additional help on how to create your QR Viewer Profile.
- Do not include a headstrap with your viewer. When the user holds the Cardboard with their hands against the face, their head rotation speed is limited by the torso rotational speed (which is much slower than the neck rotational speed). This reduces the chance of “VR sickness” caused by rendering/IMU latency and increases the immersiveness in VR.
- We strongly recommend that you refrain from using magnets. Viewers with magnet based input will not be certified moving forward.
Applying to the program
Once you’ve made sure your viewer meets the above requirements, send two (2) representative samples of each stock keeping unit (SKU) for your device(s) to Google for evaluation:
1600 Amphitheatre Parkway
Mountain View, CA 94043
Important: Do not address your package to an individual and only use the listed address above when sending your viewer in for evaluation.
Getting your badge
Once your viewer has been certified, you will receive a Works with Google Cardboard badge to display on your viewer. Learn more about formatting and placing your badge on your viewer.
After you've gotten your Works With Google Cardboard certification, you'll be expected to ensure your viewers consistently meet our quality standards. Failure to meet these standards may disqualify you from the WWGC program. We’re here to help if you have any questions or concerns - please contact us.