rosetta app icon Rosetta

Language learning Web App powered by AI

If you tried to do homework alone, you know the struggle, exercises are not always clear, you are not sure if your answers are correct, you don’t have someone to practice with, and you have a lot of questions that only a 24/7 tutor can answer. That’s why I’m building Rosetta!

App screenshot

The problem

The problem

Learning a new language is hard and requires some work. There is no shortcut or optimization that you can use to avoid doing a lot of practice. And how do you practice? Exercises, exercises, exercises. Where do you find exercises? Course books and online courses of course!

But if you've ever tried doing homework alone, you know the struggle: exercises aren't always clear, you're unsure about your answers, you don't have a practice partner, and you have many questions that only a round-the-clock tutor could answer. But can you afford that?

The Solution

The Solution

My approach was to create a ChatApp-like experience, without the overhead of building, publishing, and maintaining a native app for the various platforms. That’s why I decided to build a Progressive Web App that can be installed on smartphones and tablets and used directly from the browser.

The front end is Made of React (Ionic Framework), and the back end is serverless and written in Python. For now, it relies on OpenAI, but I plan to extend it with self-hosted LLMs. I’ve chosen Ionic because It will permit me to build the native app versions without changing the codebase if I decide in the future to publish it to the respective marketplaces.

For the back end, serverless was the natural choice due to the atomic nature of the requests and the low traffic at this early stage. Python is the language of artificial intelligence, which is why I chose it for its extensive libraries, comprehensive guides, and ease of deployment.

I chose to host everything on AWS because it's the cloud provider I know best and can deploy all necessary services on.

Additional details

Front-end

Figma Ionic React TypeScript i18next Localization Google Analytics Web APIs

Back-end

Python OpenAI LLMs Speech Recognition Prompt Engineering

Platform

AWS Lambda S3 API Gateway Cloudfront AWS CDK