WhatsApp Business app vs WhatsApp Business Platform (API): a plain guide for salons, clinics and guesthouses
Short answer. The WhatsApp Business app is the free app on your phone, usable on the phone plus up to four linked devices. The Platform (API) has no screen: you reach it through software, and AI answers, a shared inbox and automation beyond away messages need it. Meta charges on the Platform per delivered message; from 1 October 2026 each business number gets 1,000 free service messages a month. If you answer a few dozen messages by hand, the app is enough. If guests write at night or several people answer, you need the Platform.
Updated 11 November 2026 from Meta's documentation. Check the sources for current prices and rules. This is a practical guide, not legal advice.
The two products side by side
| WhatsApp Business app | WhatsApp Business Platform (API) | |
|---|---|---|
| How you use it | An app on your phone, plus up to four linked devices | No screen of its own: you reach it through software from a provider |
| Who answers | People using the phone and the linked devices | The users of the software's panel |
| Automatic replies | Greeting and away messages, quick replies you trigger by hand | Whatever the software does: rules, menus or AI |
| Catalogue, labels, quick replies | Yes | Not through the API; the software may have its own versions |
| Meta's charges | None for messages sent from the app | Per delivered message, by category and country, with some free allowances |
| Best for | Low volume, answered by hand | After-hours replies, several people answering, automation, several channels |
Meta lists the app's catalogue, labels, quick replies, greeting and away messages as unsupported on a number connected through coexistence. If your team relies on quick replies, ask the provider what replaces them.
What Meta charges on the Platform
Meta charges per delivered message, not per conversation. Template messages come in three categories: marketing, utility and authentication. Replies that are not templates are service messages, and Meta also has its own AI product, Meta Business Agent, whose messages are billed separately and never fall into a free allowance. Messages a customer sends to you are free.
From 1 October 2026 each business phone number gets 1,000 delivered service messages a month free. Unused messages do not roll over, and messages beyond the allowance are charged. Without a payment method on file, service messages stop delivering once the allowance is used, so add one first.
Service messages are the non-template replies you send within 24 hours of the customer's last message. Meta calls this the customer service window: it opens when the customer writes or calls, and it resets each time they write again. Once it closes you can send only approved templates, and only to people who have opted in.
If a customer messages you from a Click-to-WhatsApp ad on the Android or iOS app and you reply within the service window, Meta opens a free window that can stay open for up to seven days. Other message categories sent inside it are not charged, except Meta Business Agent messages.
Reading the rate card from the UK or Ireland
The amounts sit in rate card files linked from Meta's pricing page, in pounds and euros, and they change, so we do not quote them. The price depends on the category and on the customer's country calling code, not yours. Meta treats the United Kingdom as a market of its own and lists a higher UK marketing rate from 1 July 2026. Ireland sits in the group Meta calls "Rest of Western Europe". A guesthouse in Galway that writes to guests in Germany, the UK and the US can meet different rates for template messages, depending on where each guest's number is registered. Service replies inside the allowance cost nothing.
Can the same number work in both?
Meta's coexistence feature lets a business connect the number it already uses in the app to the Platform. One-to-one chats are mirrored between the two, and about 180 days of history can be synchronised when you connect. The costs, per Meta's documentation: group chats are not synchronised, broadcast lists become read-only, disappearing and view-once messages are switched off in one-to-one chats, and linked devices are unlinked until you link them again. The app must be version 2.24.17 or later.
Meta's document does not say which countries can use coexistence, so ask your provider in writing whether it is available for your number and whether they set it up that way.
Which one should a salon, clinic or guesthouse use?
Answer four questions:
- How many new conversations a day? A few dozen that you can answer by hand: the app is enough.
- How many arrive when nobody is there? An away message only says "we'll reply in the morning". If guests or clients write at night and book elsewhere, you need a reply that can run without you.
- How many people answer? Once the four linked devices are used up, or nobody knows who has answered, you need a shared inbox.
- Do Instagram and Messenger matter too? The app covers WhatsApp only. Two yes answers is a reasonable moment to move.
A short note on GDPR
Customer messages are personal data, so the provider you connect acts as your processor. Ask for a data processing agreement, the list of sub-processors, and the country where messages are stored. This is a pointer, not legal advice.
Where Agenta fits
Agenta Front Desk runs on the WhatsApp Business Platform. It answers WhatsApp, Instagram and website messages from the information you upload and hands over what it cannot answer. We go through the WhatsApp connection with you at setup. The pricing page explains how Meta's fees are handled on each plan.
Let WhatsApp messages get an answer at night too.
Try it free for 14 days →See Front Desk · Salon example · Guesthouse example · Pricing
Frequently asked questions
Is the WhatsApp Business app free?
Yes. Meta does not charge for messages sent from the app. Charges apply on the Business Platform, per delivered message, depending on category and country.
What changed on 1 October 2026?
Each business number on the Platform gets 1,000 delivered service messages a month free. Unused messages do not roll over; messages beyond the allowance are charged. Messages from the app are not affected.
Can I keep my quick replies and catalogue on the Platform?
Not through the API. Meta lists them as unsupported on a number connected with coexistence. Your software may offer its own versions.
How many people can answer from the WhatsApp Business app?
The phone plus up to four linked devices. A shared inbox for more people needs software on the Platform.
What happens to my old chats if I move to the Platform?
With coexistence, about 180 days of history can be synchronised; group chats are not. Ask your provider in writing which route they use.