GitHub Replica: try an app idea before building it

Make the idea something people can try

Before building a complete app, try the most important step with someone who would use it. You can learn whether a person knows where to go, what to enter, and what should happen next.

On October 28, GitHub released Replica with software that people can inspect and adapt under the MIT licence. It helps teams create prototypes, working models used to explore an idea, through the GitHub Copilot app. Teams supply their existing buttons, layouts, and written design guidance so the model follows their own product.

The useful opportunity is earlier feedback. A model gives a business owner and a builder something concrete to discuss before agreeing on the full project. A convincing demonstration still needs to be checked against the real work.

Read the announcement: GitHub: Introducing Replica, an open-source AI prototyping tool.

Start locally, with the right help

Replica runs on your own macOS or Linux computer through the GitHub Copilot app. It also requires the development tools listed in the setup guide. A beginner may want someone to guide the first session.

GitHub sign-in is required. GitHub-hosted AI models need a Copilot plan; connecting your own model provider is an alternative in public preview, an early version people can try, with that provider's costs and terms. The software licence does not make every part of running the tool free.

You can try a model locally without a shared server. Optional Replica Hub adds team sharing and comments, but your organisation must run and maintain that service. GitHub sign-in and requests to your chosen AI provider still involve those services.

Learn from one small interaction

Choose a single moment that currently causes confusion. Perhaps someone needs to find which request is waiting for their approval. Build only enough of that experience to test whether the next action is clear.

Keep sample information separate from live records. Explain which actions are demonstrations, especially if a button appears to approve work or send a message. You want useful feedback without anyone mistaking the model for a finished service.

1. Write the task in one sentence and describe what a successful result looks like.
2. Supply a few familiar screens or approved design rules for the builder to follow.
3. Ask someone to try the task without coaching them through each click.
4. Record where they paused, then change one thing and try again.

Let the feedback shape the next investment

Our view is that easier prototyping can make business knowledge more useful during a build. You can bring examples, notice unclear language, and explain the decisions people make. Those contributions matter whether you build with AI yourself or work alongside a specialist.

Use what you learn to write a clearer brief. Include the information the finished app needs, who may see it, and what happens when a task cannot be completed. That gives the next stage of work a purpose you can explain and check.