Better when writing quality matters.
OnlySpeak is aimed at producing more usable text immediately after dictation.
Comparison
If you are searching for an Aqua Voice alternative, the real comparison is whether you want speech capture alone or a voice-first writing tool that prioritizes clean output.
Why people compare them
Users comparing Aqua Voice alternatives are often looking for something that better fits actual writing workflows instead of generic input replacement.
OnlySpeak focuses on the quality of what appears in the target app after you speak, which is the part that usually determines whether voice becomes part of daily work.
OnlySpeak is aimed at producing more usable text immediately after dictation.
Email, chat, docs, and notes are the core use cases instead of generic dictation alone.
The product tries to reduce the editing burden that usually follows raw transcription.