Get a fully custom AI-powered chatbot or application built by an expert London-based AI development team — clean UI, robust integrations, and source code included as standard.
I Will Build a Custom AI Chatbot or App with ChatGPT Integration
Basic AI chatbot with ChatGPT integration, clean UI, and source code.
- AI LLM model integration (ChatGPT / OpenAI)
- User authentication included
- Multi-language support
- Clean, user-friendly UI/UX
- Full source code handover
- Professional communication & fast support
Enhanced AI chatbot with RAG, conversational journeys, and CRM/database integration.
- Everything in Starter, plus:
- Retrieval-Augmented Generation (RAG) for knowledge-base querying
- Pre-set conversational journey flows
- Integration with your CRM or database
- Smooth API & AI integrations across your existing stack
- Full source code handover
Full-scope AI web or mobile application with all features, extended build time, and premium delivery.
- Everything in Standard, plus:
- Full AI-powered web or mobile app development (iOS, Android, or web)
- Custom AI agents for automation and workflow
- Figma UI/UX design & prototyping included
- AI model fine-tuning & optimisation
- Full source code handover with maintainable, high-quality codebase
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Value Position
Tech Stack
AI Integration
Base Delivery
Source Code Included
What You'll Receive
Full Description
If you're ready to put artificial intelligence to work inside your business — automating conversations, streamlining workflows, and delivering smarter user experiences — this is the service for you.
Zinn Digital™ is a London-based AI development team specialising in intelligent web and mobile applications, custom GPT-powered chatbots, and AI agents built to your exact requirements. We don't ship generic templates; every solution is architected around your business goals, your users, and your stack.
**What you get from this service:**
At its core, this listing delivers a fully functional, production-ready AI chatbot or application integrated with an LLM (such as ChatGPT / OpenAI). Every tier includes user authentication, multi-language support, a clean and intuitive UI/UX, smooth API and AI integrations, and full source code handover. You own what we build.
For projects requiring greater sophistication, the Standard and Advanced tiers layer in Retrieval-Augmented Generation (RAG) — meaning the AI can query your own documents, knowledge bases, or data in real time — pre-set conversational journeys that guide users through structured flows, and direct integration with your CRM or database so the chatbot works within your existing ecosystem rather than alongside it.
**Technologies we use:**
We build across Flutter & Dart for cross-platform mobile (iOS and Android), React.js and Next.js for performant web applications, and Node.js with Express.js on the backend. UI/UX design and prototyping are handled in Figma, ensuring every interface is both visually polished and technically sound before a single line of production code is written.
**How the process works:**
After you place your order, share your project brief via the order chat — your business context, the chatbot's purpose, any integrations required, and relevant brand assets. We'll review everything and confirm scope before development begins. Our team communicates professionally and responds quickly throughout the build. Revisions are unlimited across all tiers, so the final product is exactly what you envisioned.
**Who is this for?**
This service suits founders, product teams, and businesses across e-commerce, education, healthcare, real estate, and beyond who want a bespoke AI product — not a drag-and-drop tool — built by engineers who understand both the AI layer and the full-stack beneath it.
Ready to turn your idea into a powerful AI-driven product? Place your order or send a message to discuss your project.
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Compare Packages
| Feature | Starter | Standard | Advanced |
|---|---|---|---|
| Delivery Time | 4 days | 10 days | 21 days |
| Revisions | unlimited | unlimited | unlimited |
| AI LLM model integration (ChatGPT / OpenAI) | ✓ | ✕ | ✕ |
| User authentication included | ✓ | ✕ | ✕ |
| Multi-language support | ✓ | ✕ | ✕ |
| Clean, user-friendly UI/UX | ✓ | ✕ | ✕ |
| Full source code handover | ✓ | ✓ | ✕ |
| Professional communication & fast support | ✓ | ✕ | ✕ |
| Everything in Starter, plus: | ✕ | ✓ | ✕ |
| Retrieval-Augmented Generation (RAG) for knowledge-base querying | ✕ | ✓ | ✕ |
| Pre-set conversational journey flows | ✕ | ✓ | ✕ |
| Integration with your CRM or database | ✕ | ✓ | ✕ |
| Smooth API & AI integrations across your existing stack | ✕ | ✓ | ✕ |
| Everything in Standard, plus: | ✕ | ✕ | ✓ |
| Full AI-powered web or mobile app development (iOS, Android, or web) | ✕ | ✕ | ✓ |
| Custom AI agents for automation and workflow | ✕ | ✕ | ✓ |
| Figma UI/UX design & prototyping included | ✕ | ✕ | ✓ |
| AI model fine-tuning & optimisation | ✕ | ✕ | ✓ |
| Full source code handover with maintainable, high-quality codebase | ✕ | ✕ | ✓ |
Portfolio
Examples of the seller's work related to this Zinn.
Build a Custom AI Chatbot or App with ChatGPT Integration
Build a Custom AI Chatbot or App with ChatGPT Integration
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Frequently Asked Questions
Please share details about your business, the chatbot or application's purpose, any specific features you require, and any existing platforms or systems it needs to connect with. The more context you provide, the faster we can begin. If we need anything further, we'll reach out via order chat.
Yes. We can integrate the chatbot into your current website, mobile application, or other platforms. If you have an existing codebase or API, please share relevant details in your brief so we can plan accordingly.
Yes, we can develop independent AI solutions tailored to your requirements without relying on external APIs where that is preferred or necessary. Please mention this when submitting your project brief.
Delivery times are 4 days (Starter), 10 days (Standard), and 21 days (Advanced). These reflect the scope and complexity of each tier. If your project has unique requirements, message us before ordering and we can confirm a realistic timeline.
We will iterate on the delivered build until it matches the agreed scope and your satisfaction. Revisions cover refinements to the agreed features — significant changes to scope mid-project may require a discussion, but we are always communicative and flexible.
Yes — every tier includes a full source code handover. The code is written to be clean, maintainable, and well-structured so your own team can work with it after delivery.
We serve a wide range of industries including e-commerce, education, healthcare, real estate, and more. The underlying technology and approach adapt to your sector's specific requirements.
Yes. If your requirements grow during the project, message us via order chat and we can discuss upgrading your order to the Standard or Advanced tier. Any additional cost will be agreed transparently before work continues.
Customer Reviews
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Great service with a professional approach. The seller showed good understanding of the task. Changes were accepted without hesitation. The final result matched the original idea. Worth the investment.
Solid work achieved through the custom website service. Layouts support easy navigation and readability. Animations are subtle but effective. Pages maintain fast performance. Mobile responsiveness is well executed. Impressed with the custom website service.
Very pleased with the website delivered. The structure is stable and visually appealing. All requested features were included without any issues. The quality is good and consistent. Delivery happened earlier than expected. A trustworthy developer for future work.
Simanto did it again. This is my second time working with him on another website, and needless to say, He was excellent and exceeded my expectations. Do yourself a favor, hire him, and you won't be disappointed.
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