Most AI writing tools have one problem: they only work inside a browser.
You write an email in Outlook. You need to fix a sentence. So you:
- Copy the text
- Open a new browser tab
- Paste it into ChatGPT or Grammarly
- Copy the fixed version
- Switch back to Outlook
- Paste it over the original
Seven steps. Every time.
For a quick grammar fix, this workflow is disproportionately painful — especially when you're making a dozen corrections a day.
What Makes a Great AI Writing Assistant for Desktop?
Before comparing tools, here's what separates useful from frustrating:
Works everywhere, not just in a browser The best tools are system-wide. They work in Gmail, Slack, Notion, Word, VSCode, and every other app you use daily — not just inside a specific website.
Instant shortcut — no clicking, no pasting The fastest tools let you trigger AI with a keyboard shortcut. Select text, press a key combination, done. No copy-paste cycle, no context switching.
Grammar correction and translation in one The most productive workflows combine both. Fixing an English error and translating to another language should be one step, not two separate apps.
Works on text you can't select This is where most tools fail. Screenshots, locked PDFs, image-based documents — web tools can't touch them. A desktop tool with built-in OCR can.
The Three Types of AI Writing Tools
1. Browser Extension-Based (Grammarly, QuillBot)
These install as browser extensions and work inside web apps — Gmail in Chrome, Notion in Chrome, etc.
Limitation: They only work inside the browser. Open Outlook, Slack, Word, or any native desktop app — the extension disappears.
2. Web App-Based (DeepL, ChatGPT)
You open the website, paste your text, copy the result. High quality but highest friction.
Limitation: Every correction requires switching browser tabs. The workflow interrupts your focus each time.
3. Native Desktop App (TextBoi)
Runs as a background process on macOS or Windows. Listens for a keyboard shortcut. Works system-wide — any app, any window, without a browser.
Limitation: Requires a one-time installation. That's the only trade-off.
TextBoi: The Shortcut-Based Approach
TextBoi was built around one idea: AI writing should work anywhere, not just where a browser is open.
The workflow:
- Write normally, in any app
- Select a word, sentence, or paragraph
- Press Cmd+C+C (Mac) or Ctrl+C+C (Windows)
- Choose: correct grammar, translate, rewrite, summarize
- Press Cmd+Enter to apply
The original text is replaced instantly. No switching. No pasting.
This works in:
- Email clients — Outlook, Apple Mail, Spark
- Collaboration tools — Slack, Notion, Linear
- Office apps — Word, Google Docs
- Code editors — VSCode, Zed
- Any browser — Chrome, Safari, Firefox, Arc
If you can see the text and select it, TextBoi can improve it.
What About Text You Can't Select?
This is where every web-based tool hits a wall.
Screenshots. Scanned PDFs. Locked form fields. Text that appears on screen as an image rather than selectable characters.
Web-based tools require you to type or paste the text. If you can't select it, you're stuck.
TextBoi includes built-in OCR. Press Cmd+Shift+C (Mac) or Ctrl+Shift+C (Windows), drag to select any area on your screen, and TextBoi reads the text visually — then corrects or translates it. Even if not a single character is copyable.
This matters in practice:
- A screenshot from a client with awkward phrasing
- A scanned PDF from a vendor or professor
- A locked form field in a web app
- A photo of a whiteboard with notes to clean up
No other mainstream AI writing assistant does this.
Quick Comparison
| Feature | Grammarly | DeepL | ChatGPT | TextBoi |
|---|---|---|---|---|
| Works in every desktop app | ✖ Browser only | ✖ Web only | ✖ Web only | ✔ System-wide |
| Keyboard shortcut | ✔ Limited | ✖ | ✖ | ✔ Core feature |
| Grammar correction | ✔ | ✖ | ✔ | ✔ |
| Translation | ✖ | ✔ | ✔ | ✔ 150+ languages |
| OCR — fix unselectable text | ✖ | ✖ | ✖ | ✔ Built-in |
| Free plan | ✔ | ✔ | ✔ | ✔ 150k chars/month |
| Mac + Windows | ✔ | ✔ | ✔ | ✔ |
Who Should Use a Desktop AI Writing Assistant?
You use multiple apps throughout the day. Switching to a browser tab every time you need a correction adds up fast. A shortcut-based tool eliminates that entirely.
You work in multiple languages. If you write in English but communicate in Japanese, Korean, French, or any other language, having translation on a shortcut is a genuine workflow upgrade.
You encounter text you can't copy. PDFs, screenshots, and locked fields are a daily reality for many professionals. OCR-powered tools handle what web apps can't.
You want to stay in flow. Every tab switch breaks concentration. Shortcut-based AI keeps you in the same window, in the same mental state.
Pricing
TextBoi is free to download for Mac and Windows.
| Plan | Price | Characters/month | AI Models |
|---|---|---|---|
| Free | $0 | 150,000 | GPT-4o mini |
| Basic | $5/month | 9,000,000 | GPT-4.1, GPT-4o, GPT-5 |
The free plan is enough for most daily writing tasks. Basic unlocks the latest models for heavier use.