A writing flow that stays out of your way.
SwiftPen is built around one simple loop: select text, press a shortcut, review the improved version, and keep moving.
Speak, preview, replace
Dictate thoughts or select text in any app, preview the result, and swap it in if it looks right.
Speak or select
Dictate raw thoughts, or highlight existing text in any macOS application.
Summon the AI
Hit your custom keyboard shortcut to pull up the SwiftPen panel.
Preview and replace
Review the transcription or AI rewrite, and swap it in instantly.
No copy-paste loop
You do not need to jump to a browser tab and back just to fix one paragraph.
Preview before replace
SwiftPen shows you the rewrite first so you stay in control of the final text.
Keyboard-first
Everything is designed so you can keep your hands on the keyboard and your flow intact.
Why not ChatGPT or Grammarly?
ChatGPT is great when you want to start from scratch. SwiftPen is for the text already in front of you. Grammarly polishes. SwiftPen lets you dictate, fully rewrite, use custom prompts, and run natively offline on macOS.
Frequently asked questions
The practical questions people ask before they try it.
Which apps does it work in?
SwiftPen works system-wide in any app where you can type or select text, including email, browsers, docs, and chat apps.
Does it support dictation?
Yes. You can dictate your thoughts directly into any app using the floating widget, or transcribe saved audio files to text.
What AI models does it use?
SwiftPen lets you choose from multiple lightweight, highly optimized local LLM and STT (Speech-to-Text) models to balance speed and accuracy.
Can I see my past edits?
Yes. SwiftPen maintains a secure, local history of all your rewrites, dictations, and file transcriptions so you never lose your work.
Does it work offline?
Yes. Everything runs natively on your Mac. All rewriting, dictation, and transcription happens locally, so you don't need an internet connection.
Is my data private?
100% private. Nothing runs in the background and no data is sent to the cloud. Your text, voice, and history stay safely on your device.
Can I create custom modes?
Yes. You can write custom prompts, save them as reusable modes, and apply them instantly with a single click.
How much does SwiftPen cost?
SwiftPen includes a 7-day free trial. After that, you can choose between monthly subscription or lifetime billing options.
Rewrite text without leaving the app.
Select text anywhere on your Mac, improve it in place, and stay in flow. Start your 7-day free trial, then choose monthly or lifetime billing if you want custom prompts and deeper control over the on-device model.
Requires macOS 13.0 or later.
No pressure to upgrade upfront.