1. Offline use
2. Dial info
3. Auto save whilst building lists. I've already lost count of the times I've been interrupted or knocked backup on my phone by mistake and lost everything! This is infuriating and could be very easily solved by just continually autosaving. Just about every other 3rd party squad builder app does this.
4. Ability to sort upgrades by cost or alphabetically.
5. Link to further info or on rule clarifications etc from cards i.e. what bombs do when they explode etc. This is not essential functionality but would be a nice to have further down the line.
6. Rules reference built in (could link nicely into point 5 ? ).