Be the tool ChatGPT reaches for.
SaaS Companies, Consumer Apps, Marketplaces
ChatGPT Plugin Development
Custom ChatGPT Plugins That Put Your Product Inside 1.2 Billion Weekly Conversations
Quick answer: Codersarts AI designs, builds and submits custom ChatGPT plugins for SaaS products, marketplaces and apps. Each plugin runs on a secure MCP backend with OAuth 2.1 sign-in, in-chat UI and audit logs. Prices start at $4,900, with delivery in 2–6 weeks.
ChatGPT now suggests and launches third-party plugins inside conversations, and its Dots agents use them to complete tasks. We build plugins that ChatGPT calls correctly, that look like your product, and that your customers trust.
4.9/5 client rating · Clients in 50+ countries · Fixed-price builds · NDA on request · Working-hour overlap with US & Europe
THE PROBLEM
Why Do Most ChatGPT Plugins Get Ignored?
A plugin that ChatGPT rarely calls, calls with the wrong inputs, or that returns walls of text gets ignored — by users and by ChatGPT's own suggestions.
The difference is in the details: clear tool descriptions, sensible defaults, compact responses and an interface that fits a chat window. That's what we design and test for.
WHAT WE BUILD
What's Included in a ChatGPT Plugin Build?
Tool design — the right 5–25 actions, named and described so ChatGPT picks them reliably
MCP backend — a secure server connecting ChatGPT to your API
In-chat UI — cards, tables, forms and file viewers built for ChatGPT's plugin surfaces
OAuth 2.1 sign-in — users connect their own account, with no shared keys
Submission package — listing copy, screenshots, privacy details and test accounts for OpenAI's review
Usage analytics — which tools get called, by how many users, and where conversations fail
FREE IN 48 HOURS
What You Get Before You Pay Anything
A Plugin Plan: the top prompts your users will type, the actions that answer them, a sketch of the in-chat UI, a fixed price and a working prototype of one action running in ChatGPT — within 48 hours.
COMPARISON
Plain-Text Plugin vs a Plugin Designed by Codersarts
Plain-text plugin | Codersarts plugin | |
Responses | Long text dumps | Compact cards and tables |
Tool selection | Often wrong or skipped | Descriptions tested in 50+ real conversations |
Sign-in | API key pasted by users | OAuth 2.1 |
Write actions | Run immediately | Confirm-before-write |
Analytics | None | Per-tool usage and error tracking |
WHO THIS IS FOR
Is This Right for Your Product?
A strong fit if you are:
A SaaS product whose users ask ChatGPT for help with work your product does
A marketplace or booking platform that wants to be the option ChatGPT recommends
A team with an MCP server but no polished ChatGPT experience
A team that tried building a plugin in-house and stalled at review or reliability
Not a fit if: you want a custom GPT with instructions and files only — that doesn't need a developer.
PRICING
How Much Does a ChatGPT Plugin Cost?
Starter | Interactive | Advanced | |
Price | $4,900 | $8,000–$12,000 | $12,000–$15,000+ |
Timeline | 2–3 weeks | 4–5 weeks | 5–6 weeks |
Tools | Up to 8 | Up to 20 | 20+ |
In-chat UI | Basic cards | Custom widgets | Full interactive panels |
Submission | ✓ | ✓ | ✓ |
What affects the price: the number of actions, how custom the in-chat interface is, and how complex sign-in is.
HOW WE WORK
How We Build Your ChatGPT Plugin
Use-case mapping (Days 1–3) — the prompts customers type and the actions that answer them
Build (Weeks 1–3) — MCP backend, sign-in and in-chat UI
Conversation testing (Weeks 3–4) — 50+ real prompts tested and tuned
Submit and launch — submission, review fixes and launch support
OUR GUARANTEES
Our Guarantees
NDA on day one — signed before you share any code or documents
You own the code at every milestone — full IP transfer, no retained rights
30-day bug-fix warranty — free fixes for 30 days after launch
Backup engineer — a briefed second engineer if anyone on your project is unavailable
Compliance-aligned — built to align with GDPR, HIPAA and SOC 2 controls
Time-zone overlap — working hours that overlap with US, UK, European and Middle East teams
KEY FACTS
Key Facts
Service | Custom ChatGPT plugin development |
Starting price | $4,900 |
Timeline | 2–6 weeks |
Backend | Secure MCP server, OAuth 2.1 |
Includes | In-chat UI, conversation testing, submission package |
Also works with | Claude and Gemini (small add-on) |
WHY CODERSARTS
Why Codersarts
Our engineers build MCP servers, LLM integrations and AI agents every week. We test plugins the way people actually use them — in real conversations — and the same backend powers your Claude and Gemini integrations when you're ready.
FAQ
Frequently Asked Questions
How much does a custom ChatGPT plugin cost? From $4,900 for up to 8 actions with basic in-chat cards. Custom interactive interfaces cost $8,000–$15,000+.
Plugin or custom GPT — which do we need? If ChatGPT must read or update live data for each signed-in user, you need a plugin. A custom GPT only works with instructions and uploaded files.
Can the plugin show our own interface? Yes. Plugins can show interactive panels, cards, tables and file viewers inside ChatGPT.
How long does OpenAI review take? It varies. We prepare everything reviewers ask for upfront and fix feedback quickly.
Can we reuse it for Claude? Yes. The MCP backend works with Claude, and packaging it as a Claude connector is a small add-on.
Do we get the source code? Yes. You own all code, and we hand over documentation and access at launch.
GET STARTED
Tell Us About Your Product — Get a Plan in 48 Hours
Share a few details and a Codersarts AI engineer (not a salesperson) will reply within 48 hours with a scoped plan, a fixed price and a timeline. No commitment, NDA on request.
What happens after you submit
Within 48 hours: an engineer reviews your product or API docs
Day 2–3: you receive a written plan with scope, fixed price and timeline
Day 3–5: optional 30-minute call to finalise
Kick-off: work starts within a week of your go-ahead
BACKED BY CODERSARTS
More Ways Codersarts Supports Your AI Product
AI Copilot / Chatbot Development — an AI assistant inside your own app
LLM Integration & API Orchestration — AI features inside your product
AI Agent Development — agents that act across your tools
Hire Developers — dedicated developers for your roadmap
Team Training (labs.codersarts.com) — teach your team to build plugins
Related Services in This Cluster
RECOMMENDED READING
Recommended Reading
How to Build a ChatGPT Plugin for Your SaaS (Step-by-Step)
How to Get Your App Approved in the ChatGPT Directory
ChatGPT Dots and 4,000+ Apps: Is Your SaaS Missing Out?
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