WhatsApp Business app or the API — which do you need?

We sell software built on the WhatsApp Business Platform, so you can guess which way we are meant to argue. But a fair number of businesses that ask us about the API do not need it yet, and telling them so saves everyone time.

Here is the honest version.

What the free app already does

The WhatsApp Business app is free, installs in minutes, and needs no approval from anyone. It gives you a business profile, a catalogue, away messages, greeting messages, and labels for organising chats.

For a single person answering their own customers, that is a complete tool. If that describes you, use it. Nothing below is an argument against it.

Where the app stops

The app runs out in four fairly specific places.

More than one or two people answering. The app is built around a phone. Once several agents need to see the same conversations, assign them, and know who is handling what, you are working against the design.

Sending at scale. Broadcast lists in the app are limited and manual. Sending a seasonal announcement to twenty thousand customers, segmented by what they bought, is not something the app does.

Connecting to your other systems. The app does not know your store. It cannot send a message because an order shipped, a payment failed, or a cart was abandoned, because nothing tells it those things happened.

Keeping the history. Conversations live on the device. When the person holding the phone leaves, so does the record of what was promised to whom.

If none of those four is hurting yet, you do not have a problem worth paying to solve.

What the Platform is, precisely

The WhatsApp Business Platform is an API, not an application. It has no inbox of its own. Meta documents it for developers: your systems send messages through it, and incoming messages arrive at your server as webhooks.

That is the part worth understanding before you compare prices. The API gives you capability, not a product. Somebody has to build the inbox, the campaign tool, the automation and the reporting on top of it — either your engineers or a provider like us.

It also brings rules the app does not have. You write message templates and Meta approves them before you can send. You get a quality rating and a messaging limit. You complete business verification.

What happens to your existing number

This is the question that stops most moves, and the answer changed recently, so older advice you find online is often wrong.

If the number is not on WhatsApp at all, you connect it and you are done.

If the number is already on the WhatsApp Business app, Meta gives you two routes:

Delete the app account, then register the number on the API. Your existing chat history is lost, and you cannot use that number with the app again unless you deregister it.
Onboard through a solution provider that supports running both together. Your history is preserved and the app keeps working alongside the API.

The second route only exists if your provider supports it, so ask before you delete anything. It used to be true that a number could be on the app or the API but not both. It is not true any more.

Many brands sidestep the question by starting the API on a new number and leaving the old one running. That is a reasonable choice, but it does mean customers who saved the old number will keep writing to it.

So which do you need?

Stay on the app if one or two people handle your messages, your sends are occasional and manual, and losing chat history when a phone changes hands would not hurt you.

Move to the Platform when messaging has become a job several people share, when you want messages triggered by what happens in your store rather than typed by hand, or when the conversation history has become something your business relies on.

If you are between the two, the trigger is usually the team, not the volume. One person can send a lot of messages. Two people sharing one phone cannot.

Where to go next

Start a free trial — seven days, no card, and we will confirm what happens to your number before you change anything
One inbox for your whole team — what the shared inbox adds over the app
What counts as opt-in on WhatsApp — the first rule to get right on the Platform