Neutron

As a desktop AI assistant, Neutron differs from browser-based helpers by working in any application on your Mac or Windows machine.

Neutron reads what is on your screen, then writes, summarizes and acts on it, and it offers suggestions proactively before you ask.

Linux is not supported.

You call it up with a hotkey and press Tab to accept suggested actions.

Custom instructions let you set how the assistant responds, so it can match your own workflow.

On privacy, the maker describes enterprise-grade encryption and says Neutron stays undetectable on screen shares and recordings.

Fully private, on-device AI is listed as coming soon, so for now do not assume everything stays local.

Pricing is free, and the trial needs no credit card.

That makes Neutron simple to test against the writing and summarizing tools you already use, particularly if your day is split across several desktop apps rather than a single browser tab.