The WhatsApp Business app is free and you reply yourself from your phone. The WhatsApp Business Platform (API) connects your number to a system or AI agent that replies automatically, and Meta charges per message. You can now use the same number on both: the app on your phone, the API running the agent.
Comparison
| — | Business app | Business Platform (API) |
|---|---|---|
| For | Small businesses replying themselves | Businesses wanting automated replies or integrations |
| Access | Phone app | Through a system or provider |
| Meta cost | Free to use | Per delivered message |
| Replying to a customer | Free, manual | First 1,000/month per number free, then SAR 0.0401 (Saudi) |
| Auto-reply | Fixed greeting/away text | Replies written for each question |
| Starting a chat | Write directly | Approved template after 24 h |
| Integrations | Limited | Store, booking system, team inbox |
Sources: WhatsApp's and Meta's official pages listed below, and Meta's SAR rates effective Oct 1, 2026. Work out your own cost in the calculator.
The 24-hour window
On the Platform, a customer's message opens a 24-hour service window for free-form replies; after it closes you can only send paid, approved templates. The app has no such limit, because you are the one writing.
Same number on both (coexistence)
Meta lets you connect your WhatsApp Business app number to the Platform and keep using the app. Messages are mirrored and the last 6 months of 1:1 chats sync. But some things change:
- Group chats don't sync.
- Disappearing messages are turned off in 1:1 chats.
- You can't create new broadcast lists.
This is how AQIL connects: scan a code from the app, keep the app, and the agent replies through the Platform while you can still reply yourself.
When the app is enough
- Few messages you can answer in time.
- A fixed greeting and away message are fine (how).
- No store or system to connect.
When you need the API
- Many messages, or most of them after hours.
- An agent that really answers and collects requests, not fixed text.
- A store integration such as Salla for stock and order status.
- A team that follows chats from one inbox.
Practical examples: online stores.
Try the API without leaving your app
FAQ
In one line?
Do I have to leave the app?
Is the API free?
How do I get it in Saudi Arabia?
Who pays Meta's fees with AQIL?
Unlimited broadcasts?
Sources: WhatsApp Business FAQ, Meta's WhatsApp Platform pricing page, Meta's page on onboarding WhatsApp Business app users, and WhatsApp Help Center.