Get a fully functional AI-powered application, SaaS platform or custom chatbot built with ChatGPT, LLMs and seamless API integration — complete with authentication, source code and unlimited revisions.
I Will Build a Custom AI App, SaaS or Chatbot with ChatGPT Integration
A working AI app with authentication and ChatGPT integration — sign in, sign up, user profile and one core screen.
- Sign-in, sign-up and user profile (one screen)
- ChatGPT / LLM model integration
- Pre-set conversational journey
- User authentication
- Full source code included
- Unlimited revisions
Everything in Starter plus CRM/database integration, multi-language support and Retrieval-Augmented Generation (RAG).
- All Starter features included
- Integration with CRM or database
- Multi-language support
- Retrieval-Augmented Generation (RAG) — AI trained on your own data
- Full source code included
- Unlimited revisions
The complete, enterprise-scope engagement — full-featured AI SaaS or app platform built end to end with maximum depth and complexity.
- All Standard features included at expanded scope and complexity
- End-to-end AI SaaS or application platform development
- CRM / database integration at enterprise scale
- Multi-language support and RAG with broader data coverage
- Project strategy, technical consulting and roadmap advisory
- Full source code and unlimited revisions
Request a Custom Offer
Log In to Request a Custom Offer
Create a free account or log in to request a personalised offer from this Zinner.
Log In / RegisterAsk a Pre-Sale Question
Log In to Ask a Question
To reduce platform spam, pre-sale messages can only be sent by logged-in users.
Create a free account or log in to message this Zinner directly.
Log In / RegisterAt a Glance
Key details about this service to help you decide. Generated by Zinn Hub, not the seller.
Value Position
AI Stack
Platform Coverage
Starter Scope
Upgrade Unlocks
What You'll Receive
Full Description
You need a real, working AI product — not a template, not a proof of concept. Whether it's a customer-facing chatbot, a SaaS platform powered by large language models, or a smart AI integration layered into your existing system, this service delivers a fully functional, production-ready application built from the ground up.
Zinn Digital®, based in London, England, specialises exclusively in AI-driven development. Every engagement starts with understanding your business goals, then translating them into clean, efficient code using ChatGPT, GPT-3/4, and LLM APIs — with professional communication at every stage.
**What the Starter tier delivers:**
A complete, working application with user sign-in, sign-up and profile functionality, one core screen, ChatGPT integration, a pre-set conversational journey, user authentication and full source code handover. This is the ideal starting point for founders, product teams and businesses testing an AI-powered concept.
**Stepping up to Standard** adds CRM or database integration, multi-language support and Retrieval-Augmented Generation (RAG) — meaning the AI can draw on your own data and documents to give contextually accurate responses. Delivery extends to 14 days to accommodate the additional scope.
**The Full Build** is the comprehensive end-to-end engagement: everything in Standard, expanded in scope and depth, with a 21-day timeline for more complex platforms and enterprise-grade requirements.
All tiers include unlimited revisions and full source code, so you own everything that is built.
**Services covered across all tiers:**
- AI app and SaaS platform development
- ChatGPT and LLM API integration
- Custom AI chatbot solutions
- User authentication and profile management
- Technical consulting, project strategy and roadmap advice
- Integration with websites, mobile apps and enterprise systems
**Who is this for?**
Startups launching an AI product, businesses wanting to add an intelligent chatbot to their website or app, SaaS founders integrating LLM capabilities, and product teams needing a trusted technical partner who communicates clearly and delivers on time.
Security and data privacy are built in from day one, with GDPR-compliant practices applied throughout. A free consultation is available before you order — reach out via the platform and let's map out the best solution for your project.
Zinner Quality Guarantee
Every Zinner is reviewed and approved before joining the platform.
All services are backed by our quality assurance commitment.
Your payment is protected until you approve the delivered work.
Compare Packages
| Feature | Starter | Standard | Full Build |
|---|---|---|---|
| Delivery Time | 7 days | 14 days | 21 days |
| Revisions | unlimited | unlimited | unlimited |
| Sign-in, sign-up and user profile (one screen) | ✓ | ✕ | ✕ |
| ChatGPT / LLM model integration | ✓ | ✕ | ✕ |
| Pre-set conversational journey | ✓ | ✕ | ✕ |
| User authentication | ✓ | ✕ | ✕ |
| Full source code included | ✓ | ✓ | ✕ |
| Unlimited revisions | ✓ | ✓ | ✕ |
| All Starter features included | ✕ | ✓ | ✕ |
| Integration with CRM or database | ✕ | ✓ | ✕ |
| Multi-language support | ✕ | ✓ | ✕ |
| Retrieval-Augmented Generation (RAG) — AI trained on your own data | ✕ | ✓ | ✕ |
| All Standard features included at expanded scope and complexity | ✕ | ✕ | ✓ |
| End-to-end AI SaaS or application platform development | ✕ | ✕ | ✓ |
| CRM / database integration at enterprise scale | ✕ | ✕ | ✓ |
| Multi-language support and RAG with broader data coverage | ✕ | ✕ | ✓ |
| Project strategy, technical consulting and roadmap advisory | ✕ | ✕ | ✓ |
| Full source code and unlimited revisions | ✕ | ✕ | ✓ |
Portfolio
Examples of the seller's work related to this Zinn.
Build a Custom AI App, SaaS or Chatbot with ChatGPT Integration
Build a Custom AI App, SaaS or Chatbot with ChatGPT Integration
Extra Information
Why Choose Me
Tools I Use
Perfect For
Frequently Asked Questions
Please share as much detail as possible about your project — your goals, any existing systems you need to integrate with, your target users, and any design preferences or brand guidelines. The more context you provide, the smoother the build will go. If anything is unclear, we will follow up via the order chat.
The Starter tier is ideal if you want a working AI-powered app or chatbot with core authentication and ChatGPT integration. Choose Standard if you need the AI to connect with your database or CRM, support multiple languages, or use RAG to draw on your own content. The Full Build suits complex SaaS platforms and larger-scope requirements. If you are unsure, send a message before ordering and we can advise.
RAG allows the AI to reference your own documents, knowledge bases or database content when generating responses — rather than relying solely on its general training. This means the chatbot can answer accurately about your specific products, policies or data, making it far more useful for real business applications. RAG is included in the Standard and Full Build tiers.
All tiers include unlimited revisions. Once an initial version is delivered, you can request changes and we will iterate until you are satisfied. Revisions must remain within the agreed project scope — if you wish to add new features, that would be discussed as a separate scope adjustment.
Yes. Full source code is included in every tier. You own your application completely upon delivery.
Yes. API integration into existing websites, mobile apps and enterprise software is part of the service. Please describe your current stack when submitting your requirements so we can plan the integration accordingly.
Security and data privacy are built in from the start. Best practices for user data handling, authentication and GDPR compliance are applied throughout development.
Yes — a free pre-order consultation is available. Send a message via the platform and we can discuss your requirements, recommend the right tier, and outline a clear plan before any commitment is made.
Customer Reviews
See what our customers say about this Zinn
Really satisfied by their expertise.
Only logged in customers who have purchased this product may leave a review.
