Best Speech to Text App for Dictation, for Other Uses?

Readers might help me and help other readers decide what is the best speech to text app (dictation).

I want to save myself some typing, and be able to "write" while I hike or walk or am out and about when an idea pops into my head. Or to save the strain on arms and hands (typing).

I’d prefer a simple interface, I don’t need multi-language support and most important of all: it absolutely must work without any internet connection and in airplane mode. That’s because I anticipate usage frequently when I do not have internet.

Some things I might use it for:

• Dictation for blog posts, articles (sometimes with technical words).
• Dictation for editorial purposes.
• Notes, reminders, how-to for myself or family.
• Texting or emailing someone on iOS, where typing is incredibly tedious (I suspect that this purpose may require a different app).

Thanks! I will share useful comments.