RainNest

First of all, customer service is great! Prompt, courteous and helpful. App works great even though you have to tweak here and there but that's expected. Unlike most other apps that charges a monthly fee that becomes monthly expenses, Translation Lab charges by the words translated for you, so only a one-time fee. Of course, they have upgraded service as well, which I will consider once the volume picks up but for now, as a starter, it's the best option.