Rebuild a study app's social features with Claude Code and Codex to fix retention
After his study app had 0% week-1 retention, a builder rebuilt its social layer live with Claude Code and Codex: a leaderboard where XP comes from studying, a nightly AI score of your understanding, a focus timer that costs XP if you switch tabs, follows, referrals and 30 badges.
Source
@kaiholearn on X · 2026-10-15
Written in our own words. Credit to the original author. Link checked 2026-10-20.
What they did
After his study app had 0% week-1 retention, a builder rebuilt its social layer live with Claude Code and Codex: a leaderboard where XP comes from studying, a nightly AI score of your understanding, a focus timer that costs XP if you switch tabs, follows, referrals and 30 badges.
Result (as claimed)
He shared the full build video, including having the AI question him before writing code.
Tools they used
Cost: Claude Code: from $17/mo; OpenAI Codex: free plan, paid from $8/mo.
Set it up
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.
Start the project with your agent
Open Claude Code and paste the brief. Ask it to propose a stack and a file plan before writing code.
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.
Test it like a user
Click through on desktop and phone. Ask the agent to add basic tests and fix anything that breaks.
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: Rebuild a study app's social features with Claude Code and Codex to fix retention What the original author did: After his study app had 0% week-1 retention, a builder rebuilt its social layer live with Claude Code and Codex: a leaderboard where XP comes from studying, a nightly AI score of your understanding, a focus timer that costs XP if you switch tabs, follows, referrals and 30 badges. Reported result (as claimed by the author): He shared the full build video, including having the AI question him before writing code. Source: https://x.com/kaiholearn/status/2110640796039069767 Tools they used: Claude Code, 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.
You are helping me set up this AI use case end to end in Codex. Goal: Rebuild a study app's social features with Claude Code and Codex to fix retention What the original author did: After his study app had 0% week-1 retention, a builder rebuilt its social layer live with Claude Code and Codex: a leaderboard where XP comes from studying, a nightly AI score of your understanding, a focus timer that costs XP if you switch tabs, follows, referrals and 30 badges. Reported result (as claimed by the author): He shared the full build video, including having the AI question him before writing code. Source: https://x.com/kaiholearn/status/2110640796039069767 Tools they used: Claude Code, 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.
You are helping me set up this AI use case end to end in Grok Bot. Goal: Rebuild a study app's social features with Claude Code and Codex to fix retention What the original author did: After his study app had 0% week-1 retention, a builder rebuilt its social layer live with Claude Code and Codex: a leaderboard where XP comes from studying, a nightly AI score of your understanding, a focus timer that costs XP if you switch tabs, follows, referrals and 30 badges. Reported result (as claimed by the author): He shared the full build video, including having the AI question him before writing code. Source: https://x.com/kaiholearn/status/2110640796039069767 Tools they used: Claude Code, 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.
The Daily 5
Get five new use cases tomorrow morning
Free. Real sources. Unsubscribe any time.
Guides for this use case
How to vibe code an app with Claude Code · How to learn anything with an AI tutor · How to run multiple coding agents together
Related use cases
Split spatial app work across Codex, Claude Code, Grok Bot and Dots by role
She gives each agent its own job on her spatial apps: one builds the app, one refines 3D assets, one designs the interface and brand, and one investigates glitches.
Build your own booking app overnight while you sleep
The idea came at Saturday lunch; Claude Code and Codex built and reviewed the booking app overnight and it was live by Sunday, replacing a paid booking tool.
Build a strategy game where Codex and Claude play each other
A developer built Castellan, a real-time strategy game made with Codex and Claude Code in which the players are Codex and Claude themselves.
Build and install Android apps on your phone with no computer
AppMama is an Android app that builds Android apps on the phone: you type an idea, Claude Code, Codex, Grok or OpenRouter writes the code, Gradle compiles it on the device and you install the APK.