I rarely say this, but in this case: Don't overthink it—just grab this deal. And do yourself a favor and stack two licenses right away so you can use it seamlessly on both PC and mobile.
I have tested several tools of this type and used them for quite a while. Honestly, most of them simply didn't work. Because of this, I was extremely skeptical about whether Letterly could actually deliver on its promises.

I spent over a year using a competitor’s tool (WizWrite by the Supermachine developer), and it drove me to the brink of despair. I would often have recordings lasting several minutes that would end with an error message. I lost so much time and patience.

Even worse, the transcriptions were often contaminated with random snippets from the AI's training data. My text wasn't pure; suddenly, copyright notices or random quotes from famous people would appear in the middle of my notes. It was an absolute disaster.

Letterly has everything I expect from such a tool and works absolutely reliably and perfectly.

I have just one piece of feedback and a feature request:
It would be amazing to add a "Persona" or global context feature to the account settings. This would allow me to keep my individual prompts clean while ensuring the output remains high quality. This global Persona could tell Letterly exactly who I am across the entire app—my name, job title, working style, and voice profile. I could even store contact details to be automatically inserted when dictating client messages.
If this could be added to the roadmap, Letterly would be more than perfect. I happily give this 5 out of 5 Tacos!
🌮🌮🌮🌮🌮