I Built Rewritr — A Tiny AI Writing Assistant for Windows

We all have those moments.

You write something and then stare at it thinking:

"This sounds weird."

"How do I make this more professional?"

"Can I make this shorter?"

"I know what I want to ask an AI, but I don't know how to phrase the prompt."

That was the idea behind Rewritr.

It's a small Windows app that stays out of your way and helps you work with text without constantly switching between applications.

Select some text, press Ctrl + 1, and Rewritr gives you a few options for what you want to do with it.

👉 Try Rewritr

What can it do?

• ✍️ Fix Grammar — clean up grammar and spelling
• 💬 Casual — make text more natural and conversational
• 💼 Professional — make it more polished
• 📧 Email — turn your text into an email
• ✂️ Shorten — make it more concise
• 🤖 AI Prompt — turn a rough idea into a structured prompt that can be used with ChatGPT, Claude, Codex, or other AI tools

The last one is something I particularly wanted to have.

Sometimes I know exactly what I want an AI to help me with, but the prompt in my head is basically:

"make this better and fix the thing..."

Rewritr helps turn that rough thought into something more structured that I can actually give to an AI.

The idea

This isn't meant to replace your thinking or creativity.

You bring the idea. Rewritr helps you communicate it better.

It's more like having a small writing assistant available when you need it, rather than another application you have to constantly switch to.

How I built it

This was also a technical experiment for me.

The desktop application is built with:

• Tauri
• Rust
• React
• Spring Boot
• AI APIs

Tauri handles the desktop side while React powers the UI. The Spring Boot backend handles the server-side functionality and AI integration.

I also ended up building things around the app that I hadn't originally planned for:

• Authentication
• Usage tracking
• AI integration
• Desktop installers
• Backend deployment
• Update infrastructure
• Production hosting

What started as a small tool for myself slowly turned into a proper desktop application.

Try it

If you're on Windows and want to give it a try:

👉 Try Rewritr

I'd love to hear from other developers:

What would you add to a tool like this?

And if you build something similar or have ideas for improving the workflow, I'd be interested in hearing about it.

---

Built with

Rust Tauri React Spring Boot AI