# WhatsApp Business app vs API: which do you need? > The WhatsApp Business app is free and works from a phone; the API lets a team and an AI agent answer from software. How they differ, and how to use both. Canonical: https://heykiko.io/blog/whatsapp-business-app-vs-api Last updated: 2026-11-05 WhatsApp guides · by The HeyKiko team · published 5 November 2026 · 8 min read The WhatsApp Business app is a free app for answering customers yourself, from your phone. The WhatsApp Business Platform, usually called the API, connects your number to software instead, so a whole team and an AI agent can answer, and you can send approved messages to many people; Meta charges per message. A small business that answers its own chats can stay on the app. Once you need several people, automation or volume, you need the API, and you can keep using the app on the same number. ## The difference at a glance The WhatsApp Business app compared with the WhatsApp Business Platform (API) | | Business app | Business Platform (API) | | --- | --- | --- | | What it is | An app on your phone | A connection your software uses | | Who replies | You, from your phone and linked devices | Your whole team, from an inbox, plus AI | | Automation | Greeting and away messages, and Meta's own AI agent | Any AI agent or system you connect | | Messaging many people | Broadcast lists | Approved templates to people who opted in | | Cost | Free app | Meta charges per message; 1,000 replies a month free per number | | Set-up | Download and register | Connect through a provider, ideally with business verification | [WhatsApp: the Business app](https://whatsappbusiness.com/products/business-app/) · [Meta: Business Platform pricing](https://developers.facebook.com/docs/whatsapp/pricing) ## When the app is enough - You, or one person, answer every chat yourself. - You get a handful of messages a day and answer them within hours. - Greeting and away messages cover what needs automating. - You don't need your chats in the same place as your website chat or your bookings. ## When you need the API - More than one person answers, and you don't want to share a phone. - You want an AI agent to answer from your website and documents, book appointments or open requests. - You want to message many customers at once with approved templates, with delivery and reply tracking. - You want WhatsApp chats in one inbox with your website chat and other channels. - You want customers to call your business on WhatsApp and have AI answer. [Meta: Calling API](https://developers.facebook.com/docs/whatsapp/cloud-api/calling) Meta charges per message on the API. Since 1 October 2026 each number gets 1,000 free replies a month inside open chats, then they're charged; templates are charged by category and country. Our [WhatsApp API cost calculator](https://heykiko.io/tools/whatsapp-api-cost-calculator) works out a monthly figure. ## Keeping the app: using both on one number Meta lets a business connect the number it already uses in the WhatsApp Business app to the API and keep using the app, called coexistence. Chats stay in sync both ways. According to Meta's documentation: - Up to 180 days of one-to-one chat history can be brought across when you connect, not group chats. - Messages you send from the app stay free; messages sent through the API are charged at API rates. - On the shared number, groups, voice and video calls, broadcast lists, labels, quick replies, and greeting and away messages aren't supported, and other linked devices are disconnected. - Throughput is fixed at 20 messages a second, which only matters for very large sends. [Meta: onboarding WhatsApp Business app users](https://developers.facebook.com/docs/whatsapp/embedded-signup/custom-flows/onboarding-business-app-users) > Because calls aren't supported on a shared number, a business that wants AI to answer WhatsApp calls needs a number on the API alone. ## Moving to the API 1. **Choose a provider**: A platform that connects to Meta for you through Meta's own sign-up, so you don't build anything. 2. **Connect your number**: A new number, or your app number with coexistence if you want to keep the app. 3. **Add a payment method**: On your WhatsApp account in Meta, so charged messages keep being delivered. 4. **Verify your business**: With Meta, to raise how many people you can message a day from 250 to 2,000 and up. 5. **Write your templates**: For anything you send after the 24-hour window, reviewed by Meta, usually within a day. Our guide to [adding an AI agent to WhatsApp Business](https://heykiko.io/blog/how-to-add-an-ai-agent-to-whatsapp-business) covers each step, including Meta's 2026 rules on AI. ## In HeyKiko HeyKiko connects your number to the API through Meta's sign-up inside HeyKiko, either a number on its own or your app number with coexistence. Kiko answers from your knowledge, your team replies from the [shared inbox](https://heykiko.io/features/shared-inbox), and your WhatsApp chats sit next to your website and Telegram chats. Meta bills your WhatsApp account for messages directly. See [the WhatsApp AI chatbot](https://heykiko.io/channels/whatsapp-ai-chatbot), or try it free for 14 days. ## Sources Checked on 5 November 2026. We make HeyKiko, which this guide uses as its example; Meta’s rules apply to every tool. - [WhatsApp: the Business app](https://whatsappbusiness.com/products/business-app/) - [Meta: onboarding WhatsApp Business app users (coexistence)](https://developers.facebook.com/docs/whatsapp/embedded-signup/custom-flows/onboarding-business-app-users) - [Meta: WhatsApp Business Platform pricing](https://developers.facebook.com/docs/whatsapp/pricing) - [Meta: WhatsApp Business Calling API](https://developers.facebook.com/docs/whatsapp/cloud-api/calling) ## Questions people ask ### What is the difference between the WhatsApp Business app and the API? The app is a free app you answer from yourself, on your phone. The API connects your number to software, so a team and an AI agent can answer, and you can message many opted-in customers with approved templates; Meta charges per message. ### Is the WhatsApp Business API free? Not entirely. Meta charges per message: each number gets 1,000 free replies a month inside open chats since October 2026, then they're charged, and templates are charged by category and country. ### Can I use the WhatsApp Business app and the API on the same number? Yes, with what Meta calls coexistence. Chats stay in sync, messages from the app stay free, and up to 180 days of history can be brought across, but groups, calls, broadcast lists and some app tools aren't supported on the shared number. ### Do I need the API to use an AI chatbot on WhatsApp? For an AI agent you choose, yes: it connects through the API. The WhatsApp Business app has Meta's own AI agent built in. ### Can several people answer the same WhatsApp number? On the API, yes: everyone replies from an inbox in your software. The app is built for one person answering from their own phone and linked devices. ### Do I need a new phone number for the API? No. You can connect a new number, or connect your existing app number with coexistence and keep using the app. ### Can I send broadcasts with the API? Yes, as approved template messages to people who opted in, with limits on how many people you can message a day that rise as your account builds a good record. ## Related - [How to add an AI agent to WhatsApp Business](https://heykiko.io/blog/how-to-add-an-ai-agent-to-whatsapp-business) - [WhatsApp API cost calculator](https://heykiko.io/tools/whatsapp-api-cost-calculator) - [Can AI answer WhatsApp calls?](https://heykiko.io/blog/ai-answering-whatsapp-calls) - [WhatsApp AI chatbot](https://heykiko.io/channels/whatsapp-ai-chatbot) - [All guides](https://heykiko.io/blog)