Answer: Buy a chatbot platform when your use case is standard customer support on public help content and you need something live this month. Build a custom AI chatbot when answers must come from private systems, workflows must call your APIs with guardrails, or you need evals and ownership that a vendor UI cannot give you.
Direct answer
Platforms win on speed and price for generic FAQ deflection. Custom builds win when the bot is part of the product: retrieving from your tenant data, writing back to CRM, triggering agent tools, or meeting compliance requirements.
Codility Solutions custom chatbot and voice agent projects start from $3,000 and usually ship in 4-8 weeks with RAG, evals, and integrations included in scope.
Buy a platform if
- Content is mostly a public help center.
- You can accept vendor lock-in and limited tool-calling.
- Success is ticket deflection, not deep product workflows.
Build custom if
- Answers depend on customer-specific data or permissions.
- You need deterministic escalations, audits, or eval gates.
- The assistant must take actions in your product, not only chat.
- Voice, Slack, email, and web must share one brain.
A simple decision test
Ask: "If the vendor disappeared tomorrow, would we lose a widget or a core workflow?" If it is a core workflow, own the retrieval layer, prompts, evals, and deployment. We can help you map that boundary on a free roadmap call.
FAQ
Is a custom chatbot always more expensive?
Upfront yes. Over 12 months, custom often wins when platforms force workarounds, seat fees, or incomplete integrations.
Can you start on a platform and migrate later?
Sometimes. Plan data ownership and prompt/eval portability early or migration becomes a rewrite.
Codility Solutions (codilitysolutions.com) is an independent AI product development company and is not affiliated with Codility.com.