
Sider Omni is a Mac sidebar that attaches to whatever window you're working in, like Numbers, Mail, Keynote or Safari. When a task needs it, it reads that window and does the work there. It can draft a reply with sources right next to the email you're answering, without you copying things back and forth from a chat tab. You get one Omni per window, and it follows the window when you move it or go fullscreen. It can also run on ChatGPT or Codex credits you already have. Setup takes a minute. You need to grant Accessibility and Screen Recording permissions, and it's Mac only (macOS 15 or later). It doesn't read your screen in the background. It asks when a tool needs to see the window, and normal chat still works if you say no to screen recording. If a regular chat window already does the job for you, you won't miss it.
The idea isn't new, since every AI lab wants its model to use your computer. Sider Omni's difference is narrower and more useful. It docks to the window you're already in, instead of asking you to switch to a second browser or a cloud coworker. That saves you the copying and pasting ChatGPT still makes you do.
Don't confuse it with Sider's older products. Sider is a big company known for its sidebar extension, and Omni is its new Mac agent, not the Chrome add-on with a hundred bots. It needs macOS 15 plus Accessibility and Screen Recording access. If you won't grant those, it's just a chat pane. If you will, here's a good test: open a table in Numbers, ask for a chart of sales by region, and see whether the chart shows up in Numbers.
Best for Mac users who already pay for ChatGPT or Codex and keep losing time to copy and paste. It's Mac only. If you want a record of your whole week, look at screenpipe, and if you want a separate browser for an agent, look at BrowserOS neo. Granting screen access on a work computer is the real price of entry, so decide on that before you download it.