Use Replit Agent to ship small apps and a weekly email digest

A developer used Replit Agent to build three simple apps and a Monday hackathon email automation for less than $25 total.

Done with Replit Agentยท Intermediate

What they did
Moe Lueker started with a three-paragraph brief that spelled out the theme, the feature sequence, and a few technical guardrails. Replit Agent then put together a cover letter generator, an invoice generator, and a habit tracker, opening them in a browser to check its work and fixing errors on its own. For the email workflow, they asked for a Monday morning digest of Bay Area hackathons at 8am, and the agent requested an OpenAI key before connecting search and mail.
How it went
The invoice tool came to $6.64, while the automation ran $4.50 and finished in 19 minutes. Combined with the other two apps, the total stayed below $25. The first message included links, but the PDF formatting and the habit toggle each took one extra prompt to get right.
Tips
Have your own OpenAI API key on hand before you start. Even when the agent can complete the build, you may still need a follow-up prompt for layout details or a small interaction bug.

Try it yourself with Replit Agent

Create a small app called [app name] that helps me [main goal]. Put these parts in this order: [feature 1], [feature 2], [feature 3]. Keep the interface clean and simple, and follow these constraints: [constraints]. Also set up an automation that sends me an email every Monday at [time] with a summary of [topic] sent to [email address]. Ask before any action that could spend money. When the build is done, test the app in a browser and send one test email, but stop and confirm before anything irreversible like paying, sending, deleting, or submitting.

Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.

Read the original on moelueker.com โ†—

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