Luxi works with any light meter app that can use the front-facing camera and can be calibrated with an offset. We have tested Luxi with many of the light meter apps available for the iPhone.
We're excited to tell you that we have been working with the developer who created Pocket Light Meter to create a Luxi mode which is specifically designed to be used with Luxi. Stay tuned for updates on this. We may also work with additional app developers in the future to create more exciting ways to use Luxi.