I am using the Lexham Discourse Greek NT as part of my study on an iPad (2gen). The links to the lexicon on the 4th line work well ... sometimes. Currently, if I completely shut down my iPad and then restart it, the Logos app is fully functional. If I come back to it after leaving it overnight without a complete shut down, the links do not work. This is a nuisance, of course. Please fix this.
I prefer this interlinear because of its features. I will check out another to see if the same problem exists in the meantime.
You should also know that the Lexham is available for offline use.