Quick chat, from any app
A small black tab sits on the edge of your screen. Hover it, ask something, and carry on. It grows to show how the answer is going.
AI that never runs out, and never leaves your Mac.
Mighty is a chat app like ChatGPT, except the AI runs right on your Mac. So there are no message limits, no subscription, and nobody else reading your conversations.
- Private
- No limits
- Free
No limits
Ever hit your limit mid-thought?
Most cloud AI apps count your messages. Use up your share and you wait, or you pay. Mighty runs on your Mac, so there is nothing to count.
A cloud AI app
3 left today
vs
Mighty, on your Mac
∞no limit
An illustration. The cloud app shown is generic.
- Ask as much as you likeTen messages or ten thousand. Nobody is counting.
- No waiting for tomorrowNo “come back at 6 PM”, and no slow lane.
- No upgrade buttonNothing to subscribe to, and nothing to pay each month.
Private
What you type stays on your Mac.
Most AI apps send every message to a company’s computers. Mighty doesn’t send your chats anywhere. The AI reads your questions, documents and photos right on your Mac, and they stay there.
- No account. Nothing to sign up for, and no password to remember.
- Your chats live in a folder on your Mac. Delete the folder and they’re gone.
- It works with the internet off. Once it is set up, even on a plane. Try it on the right.
Click the Wi-Fi icon, then ask Mighty something.
Getting started
Nothing to set up. Really.
No Terminal, no accounts, no hunting for the right AI. Mighty sets itself up, then looks at your Mac and suggests the AI that fits it best.
-
Step 1Mighty.dmg
Download
One file, about 2.6 GB, with your first AI already inside.
-
Step 2
Open it
Drag Mighty into Applications and open it. macOS asks you to confirm once, and Mighty shows you how.
-
Step 3
Say hi
Tell Mighty your name, then type anything. It picks an AI that suits your Mac.
The first time you open it, Mighty may need the internet for a few minutes to fetch its engine (a one-time download of about 500 MB). After that, it works offline.
About the macOS warning. Apple only skips it for apps whose makers pay $99 a year to have them reviewed, and Mighty isn’t one of them. So the first time:
- Open Mighty, and click Done at the warning.
- Open System Settings ▸ Privacy & Security and click Open Anyway.
Characters
Same AI. Five different voices.
A character changes how the AI talks to you: shorter, slower, friendlier, tougher. Pick one for each chat, or let Auto choose for every message.
Ask all five: Should I paint my bedroom dark green?
Example answers, written to show each character’s style.
Auto
Picks the right character for each message you send.
Make your own
Answer a few questions and pick a look. Mighty writes the personality.
Share with AirDrop
A character is a tiny file. Send it to a friend, and it opens in Mighty.
And more
Plenty more, when you want it.
Drop a file hereLease.pdf
Reads your PDFs and photos
Drop a file into the chat and ask about it. It is read on your Mac and never uploaded.
Start with the numbers.
Or just decide.
Group chats
Put two to six characters in one room and watch them talk to you, and to each other.
$41.20
Saved so far, compared with a cloud AI. (An example.)
See what you save
Mighty counts everything it writes, and shows what the same chats would have cost on a cloud AI. It is an estimate, and it says so.
⌘NNew chat
⌘↑Previous chat
⌘⇧DDashboard
⌘,Settings
Made for the keyboard
Every shortcut can be changed in Settings.
Downloading updateRestart
Updates itself
New versions download quietly. When one is ready, a Restart button appears, and your answer is never interrupted.
The real app
Here it is, for real.
A chat, with the answer written out.
Honestly
So, how smart is it?
The AI inside Mighty is smaller than the giant ones in the cloud. For everyday work it is great. For the very hardest problems, a cloud AI can still do better. A Mac with more memory can run a smarter one.
Great for
- Writing and rewriting. Emails, messages, essays.
- Summaries of long documents and articles.
- Explaining things in plain words.
- Brainstorming names, ideas and plans.
- Translating and everyday coding help.
Not its strength
- The hardest maths, logic and research problems.
- Today’s news. Mighty doesn’t browse the web.
- Always being right. Like any AI, it can slip. Check anything important.
No. If you can send a text message, you can use Mighty. You type, it answers. Everything else is optional, and there is a short guide if you are curious.
Yes. Mighty is free to download and use, and so are the AI models inside it. There is no account and no subscription, because the AI runs on your own Mac instead of on a company’s servers.
Only for setup and updates: to download Mighty, to fetch its engine the first time you open it (about 500 MB), and to get extra AI models and new versions. Once it is set up, chatting works offline, because the AI lives on your Mac. The app download already includes a first AI model.
It feels like a chat app, but the AI runs on your Mac instead of in the cloud. That means no message limits, no subscription, and no one else reading your chats. The trade-off is that cloud AIs are bigger, so for the hardest questions they can still be sharper.
While Mighty writes an answer, your Mac works hard, the way it does when you export a video. Then it rests. Mighty unloads the AI from memory after a few quiet minutes, and a small meter in the sidebar shows what is in use.
Any Mac running macOS 14 (Sonoma) or later. More memory means smarter AI: 8 GB runs quick, friendly models, and 16 GB or more runs noticeably smarter ones. Mighty looks at your Mac and suggests models that fit.
In a folder on your Mac, ~/Library/Application Support/Mighty, along with your characters, usage numbers and models. Nothing is uploaded. Delete that folder and Mighty forgets everything.
Apple only skips that step for apps whose makers pay $99 a year to have them reviewed, and Mighty isn’t one of them. You confirm once, and updates never ask again. Installing with the Terminal command skips the step entirely.
No. Mighty carries its own private copy of the engine and runs it on a port of its own. It never reads or writes your ~/.ollama folder, so the two sit side by side.
Meet Mighty.
Free, private, and ready in a few minutes.
Prefer Terminal? Install with one command
curl -fsSL https://downloads.rasmusbyskov.com/mighty/install.sh | bashA 7 MB download with no macOS security step. Mighty fetches its engine and a first AI model the first time it opens.