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ChatGPT app ideas

Apps built with the Apps SDK run inside ChatGPT conversations. The SDK is built on MCP.

What you'd build

MCP servers
2
SaaS products
2
Apps
1
5
ChatGPT apps ideas
3.6k
upvotes on the source threads
15
Reddit threads
0
weekend-sized builds

Build time vs. demand

Bar length = upvotes on the Reddit threads behind each idea

5 ChatGPT apps ideas

Most upvoted first. Open a card for build steps and threads

1.8k
1 Reddit thread
App

Spreadsheet cleanup app for ChatGPT

Turns a messy CSV into a clean, editable table right inside the ChatGPT conversation.

ChatGPT logo1 to 2 weeks$12/mo
How to build it
  1. 1Build an MCP server with tools to load, clean and export a table.
  2. 2Render an editable grid inside the chat with the Apps SDK.
  3. 3Charge for large files and saved cleanup recipes.
Apps SDKMCP serverReact grid widgetBuyer: Ops and finance people living in spreadsheets

The Reddit threads

866
5 Reddit threads
MCP server

Shared agent memory

One memory store that Claude Code, Codex, Cursor and ChatGPT all read, so no session starts blank.

Claude Code logo>_Cursor logoChatGPT logo1 to 2 weeks$9/mo hosted
How to build it
495
3 Reddit threads
SaaS

Internal tools studio

Rebuild a local business's worst spreadsheet as a small app with your agent. Charge monthly.

Claude Code logo>_Cursor logoChatGPT logo1 to 2 weeks$500 setup + $100/mo
How to build it
382
2 Reddit threads
MCP server

MCP tool router

One MCP server in front of many, loading only the tools a task needs so context stays small.

Claude Code logo>_Cursor logoChatGPT logoA month$15/mo
How to build it
  1. 1Proxy several downstream MCP servers behind one endpoint.
  2. 2Expose a search_tools tool and load full tool schemas only on demand.
  3. 3Charge for hosted routing and shared team server lists.
MCP TypeScript SDKEmbeddings searchProxyBuyer: Power users with 10+ MCP servers

The Reddit threads

22
4 Reddit threads
SaaS

MCP server trust score

Tests public MCP servers for uptime, source code and hidden instructions, then grades each one.

Claude Code logo>_Cursor logoChatGPT logoA monthFree directory, $49/mo API
How to build it

The threads behind them

Most upvoted Reddit posts

BID MCP server

Ask your agent what to build next

Connect Business Ideas Database to Claude Code, Codex or Cursor and search validated ideas, Reddit proof and keyword data without leaving the terminal.

# Claude Code
claude mcp add --transport http bid \
https://businessideasdb.com/api/mcp \
--header "Authorization: Bearer $BID_KEY"
✓ Connected: search_ideas, get_idea
# then just ask
find me a dev tool idea with real demand

Questions

What is the ChatGPT Apps SDK?

The Apps SDK lets developers build apps that run inside ChatGPT conversations, with their own interface. It is built on the Model Context Protocol, so the backend of a ChatGPT app is an MCP server.

What is the easiest ChatGPT apps idea to start with?

Spreadsheet cleanup app for ChatGPT: Turns a messy CSV into a clean, editable table right inside the ChatGPT conversation. It is sized at 1 to 2 weeks, and the threads behind it have 1.8k upvotes.

More vibe coding ideas

By agent and by build type

Your next idea is already validated.

You just haven't seen it yet.