Compare the way AI writing assistants actually work.
Grammarly, ChatGPT, Wordtune, Apple Writing Tools and ControlG overlap, but they are not interchangeable. Compare how each tool starts a rewrite, where the result appears, which devices it supports, and how much you can customize.
Five products, five different strengths.
This table compares documented product workflows, not model quality. Features and plans can change.
Swipe the table sideways to see every product.
| Question | ControlG | Grammarly | ChatGPT | Wordtune | Apple Writing Tools |
|---|---|---|---|---|---|
| Primary workflow | Shortcut or typed trigger runs a reusable rewrite action | Continuous assistance and suggestions in supported text fields | General-purpose chat workspace with desktop and mobile apps | Rewrite suggestions through its editor, browser extensions and iOS app | Select text and choose a Writing Tools action |
| Where the result appears | Replaces the original in the active supported field | Suggestions appear in the field; generated text can be inserted | Usually in ChatGPT; the Mac app can work with a documented set of supported apps | Suggestions appear through Wordtune surfaces and integrations | In most places you write on a supported Apple device |
| Reusable custom actions | Yes, with a prompt, provider, model and trigger | Generative prompts and Grammarly features, but not the same trigger-action model | Broad prompting and custom tools, but not a field-trigger workflow | Rewrite modes, tones and suggestions | Built-in actions plus Describe a change |
| Bring your own model key | Supported for multiple providers | Not documented as a consumer workflow | Not documented as a consumer ChatGPT workflow | Not documented as a consumer workflow | Not documented; optional Compose can use ChatGPT |
| Platform emphasis | Native Mac, Windows and Android workflows | Mac and Windows desktop integration, plus other Grammarly products | Desktop, web and mobile chat applications | Web app, Chrome, Edge and iOS | Eligible Apple Intelligence devices and supported OS versions |
| Pricing approach | Free built-in allowance, then $29 one-time Pro licence | Free and paid plans | Free and paid plans | Free daily limits and paid subscriptions | No separate Writing Tools plan, but compatible Apple hardware is required |
“Not documented” means the reviewed first-party consumer documentation does not present that workflow. It does not claim the vendor can never offer it.
Choose the closest alternative to compare.
Choose ControlG for a repeatable rewrite action.
ControlG is designed for people who already know the edit they want. Select text and press a shortcut on Mac or Windows, or type a configured trigger on Android. The active action then replaces the original in the same supported field.
It is especially distinct when you want reusable custom prompts, your own supported model key, and one workflow spanning Mac, Windows and Android.
Choose the broader product when the task is broader.
Grammarly is a stronger match for continuous feedback while you write. ChatGPT is a broader assistant for conversations, files, research and multimodal tasks. Wordtune centers on alternative rewrites and tones. Apple Writing Tools are convenient when you already use eligible Apple hardware.
The right choice depends on the workflow you want, not the longest feature list.
Check the current vendor documentation.
Want the rewrite to happen where you type?
See the ControlG workflow on Mac, Windows and Android, then test it with the free built-in allowance.
Choose your platform