WhatsApp Business app vs API vs Linked Number: which do you need?

The WhatsApp Business app is the free app you install from the store. It gives you a business profile, a catalog, a greeting message, an away message, quick replies and chat labels. It runs on your phone and you can open it on linked devices like WhatsApp Web, but it is still one account answered by one or two people.

The WhatsApp API, officially the WhatsApp Business Platform, has no app at all. The number is connected to software and messages reach a program that answers them: a shared team inbox, an AI agent, or your own system. Most businesses reach it through a Business Solution Provider (BSP) such as Twilio, Interakt or 360dialog. We cover it in depth on WhatsApp API in Saudi Arabia.

A Linked Number is a third route that Gental offers. You scan a QR code from Linked devices in the WhatsApp app on your phone, the same way you link WhatsApp Web, and the agent answers from your own number. There is no provider and no Meta account to set up, and it can follow WhatsApp groups. It is also an unofficial connection, and we are upfront about the risks below. Details are on the WhatsApp Linked Number page.

If you run a shop or offer a service and can answer your messages yourself, the app is more than enough. Put your hours and location in the business profile, turn on a greeting and an away message, and save quick replies for the questions you get every day, like prices and directions. We wrote out every step, with ready-to-copy messages, in the WhatsApp Business auto reply guide.

The trouble starts as you grow. Quick replies are fixed text that can’t understand what a customer means, and an away message says “we’ll reply tomorrow” without answering anything. Once you have staff, they all work from the same account on linked devices, with no chat assignment and no reporting. And everything hangs on one phone: if it is lost, broken or leaves with an employee, your customer service goes with it.

A lot of business in Saudi Arabia runs on one number everybody knows: the shop owner’s, the real estate office’s, the gym coach’s. That number sits in neighbourhood, market and customer groups, and moving it to the WhatsApp API means losing those groups, because the official platform can’t join groups your number is already in. (Meta’s Groups API only lets an Official Business Account create its own invite-only groups, and Gental doesn’t use it.)

A Linked Number solves that. The agent answers private chats from your knowledge, reads the groups you pick, spots the requests you can serve and saves each one as a lead. When you write from your phone in a chat, the agent stays quiet there for as long as you set, so it never talks over you.

There are no Meta fees, because messages go out through the WhatsApp app itself; you pay only for your Gental plan. But the connection is unofficial, which brings us to the most important section of this guide.

You used to have to choose: a number lived either on the WhatsApp Business app or on the platform. Meta now offers Coexistence. According to Meta’s developer documentation, a WhatsApp Business app account can be connected to the platform through a provider, and the number stays registered on both at once.

Per the same document, the app must be version 2.24.17 or later, contacts and up to six months of chat history can be synced if you approve it, and messages you send from the app stay free while platform messages are charged at platform rates. There are limits: group chats are not synced, broadcast lists, disappearing messages and view-once messages are turned off, and throughput is fixed at 20 messages per second.

Coexistence depends on your provider, so ask them first whether they support it. Note that it does not replace a Linked Number if your goal is groups, because group chats don’t move to the platform. Meta’s Groups API only lets an Official Business Account create its own invite-only groups; it can’t join groups your number is already in, and Gental doesn’t use it.

The WhatsApp Business Messaging Policy applies to the Business app and the platform alike. The key points: only message people who have agreed to hear from you, honour every request to stop or block, and outside the 24-hour window send only approved template messages. If you automate replies, give customers a clear, quick way to reach a person or another support channel.

Meta says it may limit or remove your access to WhatsApp for Business if you break the policy. So even an official number has rules; the difference is that a Linked Number carries extra risk because the connection itself is unofficial. Gental’s handover to a teammate helps you meet the human-escalation rule, and the WhatsApp AI agent page shows how it fits together.