ChatGPT App Development. Your product, inside ChatGPT.
We build ChatGPT apps on MCP and the Apps SDK: the tools, the server, sign-in and everything OpenAI's review asks for, with an engineer reviewing every change.
We grow your business with
- CROturn traffic into leads
- SEOrank & get found
- GEOwin generative search
- AEOget cited by AI answers
- AIbuild a website that learns
What a ChatGPT app is
Put your product inside ChatGPT
A ChatGPT app lets people use your product without leaving the conversation: search your catalog, check an order, book a slot or pull a report. Under the hood it is a remote MCP server your team runs, plus optional interface components, built with OpenAI's Apps SDK. OpenAI's developer docs now call published apps plugins, so you'll see both names.
We design the tools, build and host the MCP server, add sign-in, and prepare the submission OpenAI reviews before an app appears in the ChatGPT directory. The same server can also work in Claude and other AI apps that support MCP.
New to this? Read the ChatGPT app directory explained and how to submit an app to ChatGPT, or compare approaches in MCP vs the ChatGPT Apps SDK.
What we build
ChatGPT app development services
Tool design
The actions your app exposes, named and described so ChatGPT calls them correctly, with read and write tools kept separate.
Remote MCP server
A server on a stable public HTTPS address, built with the official SDKs and tested in ChatGPT.
Interface components
Cards, lists and forms that render in the conversation when plain text isn't enough.
Sign-in and access
OAuth sign-in for your users and narrow scopes, so each person sees only their own data.
Submission package
Tool annotations, test cases, a reviewer account, a walkthrough video and the domain check OpenAI asks for.
Updates after launch
New tools, spec updates and fixes as OpenAI's requirements change.
What OpenAI checks
Built for review from day one
OpenAI reviews every app before it is published. Its submission docs and app guidelines (checked 6 November 2026) set out what a submission needs. We plan for these from the start:
- One remote MCP server on public HTTPS
- Domain verification on your site
- Read-only, destructive and open-world hints on every tool
- Positive and negative test cases
- A reviewer account without MFA codes
- A short video walkthrough
- An official connection to your own service
- Physical goods only for commerce
- A name that doesn't end in "MCP"
OpenAI doesn't publish a review timeline, and approval is its decision, so we don't promise a launch date.
The process
How a ChatGPT app project runs
Scope first, then build, test and submit, with a person signing off at each step.
Scope
Which jobs users should do in ChatGPT, which data they need and what must stay in your product.
Design the tools
Names, inputs, outputs, permissions and any interface components, written down before code.
Build
The MCP server and components, built with Claude Code and reviewed by an engineer.
Test
Tested in ChatGPT and with the MCP Inspector, including failure cases and permission checks.
Submit
We prepare the submission package and answer OpenAI's review feedback with you.
Maintain
Monitoring and updates. OpenAI rescans published apps, and new tools need approval.
Pricing
Quoted per project
ChatGPT app projects are quoted as a fixed scope after a short call. The price depends on the number of tools, sign-in, interface components and the systems involved. See MCP server development cost for what drives it. Hosting and AI app subscriptions are billed by their providers.
Ask for a quote →Before you build
Guides for ChatGPT app teams
How the directory works, how review works and how to plan the launch.
The ChatGPT App Directory Explained: Apps, Plugins and Custom MCP Servers
What the ChatGPT app directory is now: plugins vs apps, what users see, which plans can install them, and how public listings differ from custom MCP servers.
Read the guide →How to Submit an App to ChatGPT: OpenAI's Plugin Review, Step by Step
How to submit a ChatGPT app built on MCP to OpenAI's plugin directory: verification, the ZIP and review materials, the review steps, and what gets rejected.
Read the guide →MCP vs ChatGPT Apps SDK: Plain Servers vs ChatGPT Plugins (2026)
MCP or the ChatGPT Apps SDK? OpenAI now calls Apps SDK builds plugins, built on MCP and MCP Apps. Compare reach, UI, review rules and costs as of October 2026.
Read the guide →MCP Server Launch Checklist: Auth, Tools, Registry, Directories and Your Website
A pre-launch checklist for a public MCP server: auth, tool annotations, docs per AI app, registry server.json, Claude and ChatGPT submissions, and analytics.
Read the guide →
Project Managers who will work with you on your project!
Irina S.hello@eseospace.com
Benjamin G.ben@eseospace.com
David G.david@eseospace.comWork with us
Talk to the team behind your project
Tell us what you need and we’ll match you with the right people.
Book a Discovery Call
Jeanette M.jeanette@eseospace.com
Mark S.mark@eseospace.com
Maryna P.maryna@eseospace.com
FAQ
Common questions
What is the difference between a ChatGPT app and a custom MCP connector?
Are ChatGPT apps and ChatGPT plugins the same thing?
Can the same server work in Claude?
Can you guarantee OpenAI approves our app?
Can you sell subscriptions through a ChatGPT app?
Want your product in ChatGPT?
Book a free strategy call. Tell us what users should be able to do in ChatGPT, and we'll outline the tools, the review checklist and a fixed quote.
Book a Strategy Call →
