published mar 19, 2026
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This guide teaches you how to use Replit’s Tasks feature to improve an existing website or app without disrupting the version that already works. You will create isolated parallel tasks, review each task in its own preview, and merge only the changes you want back into your main version.
You will set up parallel sub-agents inside Replit, with each one focused on a specific improvement to your website or app. The reusable output is a safer workflow for testing and merging improvements one at a time.
Keep each task narrow so the agent can solve one isolated problem at a time instead of pushing the project back into a doom loop.
Go to replit.com. If you are starting from scratch, enter your app idea and choose Plan first. If you already have an app, open it and review the plan Replit generates before you start building.
The plan shows how Replit is thinking about the work. It gives you a task list, notes what should not be touched, and defines what “done” looks like before code changes begin.
Take a second to actually read the plan. In the source test, it was one of the most useful parts because it clearly defined the tasks and the finish line.
Once you are in your Replit project, click the plus button on the far-left sidebar to open the task menu. This is where you can create a separate task for one focused improvement.
Make this dashboard and all relevant components fully mobile responsive. Use different components for mobile if not possible.That last line matters. Sometimes components do not collapse cleanly on smaller screens. Telling Replit it can use different mobile components gives it more room to solve the problem instead of squeezing the same layout into a phone screen.
While the first task is planning, queue a second one in parallel. This could be something like modernizing the landing page, cleaning up the nav bar, or fixing a bug.
This is the value of Tasks: instead of piling everything into one thread and hoping the agent keeps track of it all, you split the work into isolated jobs that can run separately.
Keep each task narrow. “Modernize the landing page” is okay. “Redesign the whole app, fix three bugs, and improve onboarding” is how you get back into a doom loop.
Let each task generate its own plan, then start them.
Replit treats tasks like mini agents with separate previews, so you can inspect the work without affecting your main app.
When a task finishes, it turns green. Click into it and open the preview tab to review the result. In the source test, the mobile responsiveness task was the clear win. The landing page refresh looked better too, but it also showed why vague prompts usually need a second pass.
When you find a task you like, click Apply Changes to Main Version to merge that updated code back into your production app.
This makes the workflow safer: you are not committing to every idea the agent had. You review each isolated result, keep the good work, and leave the rest behind.
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