Koi vs VoiceOS: two voice assistants for your Mac

Pick VoiceOS if you mostly dictate and want a voice agent that works through your apps, like Gmail, Slack, Notion and your calendar, for less money. Pick Koi if you want an assistant that answers out loud, points at your screen, draws the answer and clicks for you, with dictation that runs on your Mac and calls recorded without a bot.

Where Koi falls short of VoiceOS:

• Price. VoiceOS Pro is $11.99 a month billed yearly. Koi Pro is $20 a month, or $192 a year.
• Connectors. VoiceOS's Agent Mode works with Gmail, Slack, Google Calendar, Notion, Linear and more, plus your own MCP servers. Koi has no MCP and connects only Google Calendar, Apple Calendar and Reminders.
• Languages. VoiceOS lists 100; Koi's dictation handles 57.
• A longer trial and a way to stay. VoiceOS gives 7 days, then a small weekly allowance after you cancel. Koi's trial is 3 days and there's no free plan.
• Windows. VoiceOS lists Mac and Windows; Koi is Mac only.

We make Koi, so read this with that in mind. VoiceOS's details come from its home page and pricing page, checked October 16, 2026.

Both put your words where your cursor is, in any app. VoiceOS removes filler words and fixes grammar, offers polish styles, takes custom vocabulary and replacements, edits selected text by voice, and lists 100 languages. Its site says your audio is never stored on its servers unless you allow it to help improve the product, and that none of your data is used for training. It doesn't say where the speech is turned into text.

Koi's dictation runs on your Mac. Tap Fn + ⌥ and Whisper writes as you speak, offline, in 57 languages it tells apart by itself. The ums and stammers go, chats and code get no full stop at the end, names on your screen come out spelled right, and a word you fix once is spelled your way from then on. It's unlimited on every plan, and the audio never leaves the Mac. If dictation is all you need, our best dictation apps for Mac covers cheaper and free options.

VoiceOS's line is “your cursor is the context”: point at something and ask. Its Agent Mode connects to Gmail, Slack, Google Calendar, Notion, Finder, Messages, Linear, Chrome, Google Drive, Google Docs and Obsidian, takes your own MCP servers, searches the web with sources and sets reminders. Its pricing page lists action confirmation. It doesn't say it clicks around your Mac or draws on the screen.

Koi is built around the screen itself. Tap Fn + ⌘ once and talk; it answers out loud and you go back and forth. Ask “which one do I click?” and it circles the button. Ask how something works and it draws a diagram over the screen. Say “click Skip” and it uses real clicks and keys, then checks that it worked. It reads your Mac's own apps when you allow it, today's calendar, unread mail, open tabs, a note, a contact, but it never buys, pays, sends, posts, deletes, signs in or types a password, and that's enforced in the app. See what Koi does on a call.

• Call recording. Tap Fn + ⌃ and pick Online call or In person. No bot joins; You and Them are written down apart on your Mac, with the screen's video, and notes come only if you say yes.
• Documents with tables, charts and LaTeX, flashcards and Study mode, kept on your Mac.
• Its own calendar, with Google Calendar, Apple Calendar and Reminders beside it.
• Lifetime, paid once: $59 for the first 25 buyers, rising to $199.

• You want the cheapest good dictation plus an agent for Gmail, Slack and Notion? VoiceOS.
• You need Windows, or more than 57 languages? VoiceOS.
• You want an assistant that talks back, points at your screen and presses buttons for you? Koi.
• You want dictation that works offline, and calls written down on your Mac? Koi.

Koi's plans are on the pricing page. Comparing more widely? See Koi vs Vellum Ambient, Wispr Flow alternatives for dictation, or the best AI assistants for Mac.