Real AI agent use cases, with sources and setup prompts

Build a campus hangout app with Codex in a student competition

Two students built an iOS app with Codex in a TV-style competition: you swipe on spontaneous hangouts on your college campus to meet people outside your major. They later built Finnie, a financial aid tool to help students go to college for free, also with Codex.

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Source

@fatimahs_tech on X · 2026-10-19

Written in our own words. Credit to the original author. Link checked 2026-10-19.

What they did

Two students built an iOS app with Codex in a TV-style competition: you swipe on spontaneous hangouts on your college campus to meet people outside your major. They later built Finnie, a financial aid tool to help students go to college for free, also with Codex.

Result (as claimed)

They won a ChatGPT student grant and filmed a Codex commercial that was introduced on the OpenAI DevDay stage, as they describe it.

Tools they used

OpenAI Codex

Cost: OpenAI Codex: free plan, paid from $8/mo. Checked 2026-10-14.

Set it up

  1. Write a one-page brief

    Describe the app in plain words: who it is for, the 3 core screens or actions, and what "done" looks like.

  2. Start the project with your agent

    Open OpenAI Codex and paste the brief. Ask it to propose a stack and a file plan before writing code.

  3. Build one slice at a time

    Ship the smallest working flow first, run it, then add features one by one. Commit after each working step.

  4. Test it like a user

    Click through on desktop and phone. Ask the agent to add basic tests and fix anything that breaks.

  5. Check security and ship

    Keep keys in environment variables, check auth and database rules, then deploy and share the link.

Copy the full setup prompt

Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.

You are helping me set up this AI use case end to end in Claude Code.

Goal: Build a campus hangout app with Codex in a student competition
What the original author did: Two students built an iOS app with Codex in a TV-style competition: you swipe on spontaneous hangouts on your college campus to meet people outside your major. They later built Finnie, a financial aid tool to help students go to college for free, also with Codex.
Reported result (as claimed by the author): They won a ChatGPT student grant and filmed a Codex commercial that was introduced on the OpenAI DevDay stage, as they describe it.
Source: https://x.com/fatimahs_tech/status/2112259282712633766
Tools they used: OpenAI Codex
Category: Vibe coding & apps

Please:
1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like).
2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure.
3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data.
4. Finish with a checklist to run it again next time.

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Guides for this use case

How to run multiple coding agents together ยท How to build an iPhone or Android app with AI

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