Free WhatsApp AI agent.
No cap on AI replies.

A WhatsApp AI agent is software that answers your WhatsApp for you. A menu bot asks customers to “press 1 for prices”. An AI agent reads what the customer actually wrote, in their own words and language, and replies in plain language from what you’ve told it about your business. Good ones also act: they save an order, look something up in your system, or send a follow-up.

The difference shows on the questions nobody planned for. “Do you deliver to Gurgaon on Sunday, and is the 50 ml in stock?” breaks a menu bot. An AI agent answers it from your delivery rules and product list, or says plainly that it doesn’t know.

Meta also sells an AI agent inside the WhatsApp Business app and on the API, billed by usage. Our Meta Business Agent explainer covers what it does and costs.

The AI part is what WhatsApp platforms meter. Plans advertise a free tier or a trial, then sell AI replies as an add-on with a monthly allowance. Here is what each one includes, from their pricing pages:

Allowances sound generous until you count. A shop that gets 100 chats a day, with four AI replies each, sends about 12,000 AI replies a month:

• Interakt: 100 included, then 11,900 × $0.011 = $130.90, on top of the $74.99 add-on and the $55 Growth plan.
• AiSensy: the $50 add-on covers 1,000, a twelfth of the month, and the rest is charged separately.
• Meta’s fees on the API: 11,000 replies past the free 1,000 cost about ₹1,265 in India or $37.40 in the US, before any provider fee.
• Wapzen: $0. There is no reply cap and no Meta message fee, because it doesn’t use the API.

Prices are from each vendor’s pricing page on the date at the top of this post, in the currency they show outside India. You may see local prices. See is the WhatsApp Business API free? for Meta’s side of the bill.

Wapzen is a free AI agent for WhatsApp. It links to the number you already use and answers your customers day and night. Here’s what it does:

• Answers every one-to-one message, including photo and video captions, in the customer’s language, usually within a few seconds.
• Answers from your knowledge base. Paste your FAQ or price list, or upload PDF and Word files. For each message, the agent pulls the passages that match.
• Remembers the conversation. It keeps the last 20 exchanges word for word and a summary of anything older, so customers don’t repeat themselves.
• Doesn’t make things up. If a price, delivery time or policy isn’t in its instructions or knowledge, it says so instead of guessing.
• Takes orders. With the built-in Take Order tool, it collects the items, name and address, reads the order back, and saves it once the customer confirms. See the order-taking guide.
• Calls your systems. API request tools let it check an order status or a free slot in your own software.
• Sends bulk messages. Upload a contact sheet and send one personalised message to each person, with a gap between sends. See the bulk message guide.
• Answers calls. The AI voice agent picks up WhatsApp calls in a natural voice and can call leads back. See the free AI calling agent.
• Saves every chat in your dashboard, where you can read along and reply yourself.

1. Sign up for free. A starter agent is already waiting in your account.
2. Write its instructions. Say who it speaks for, what you sell, your prices and hours, how long replies should be, and what to do when someone wants a person.
3. Add your knowledge. Upload your FAQ, price list or policies, then attach the knowledge base to the agent.
4. Link your number. On a computer, scan the QR code from WhatsApp → Linked devices → Link a device. On a phone, enter your number and type the 8-character pairing code into WhatsApp.
5. Test it, then switch it on. Message your number from another phone and ask the questions your customers ask. Fix the instructions wherever an answer is off.

Instructions don’t need to be long. Here is a complete example for a small online store:

You are the WhatsApp assistant for Sunleaf Skincare, an online store in Pune.
Answer questions about products, prices, delivery and returns from the knowledge base.
Delivery takes 2 to 4 days across India and is free above ₹999. Cash on delivery is available.
Keep replies short: two or three sentences.
When someone wants to order, collect the product, quantity, name, address and phone,
read the order back and ask them to confirm.
If someone is upset or asks for a person, say a team member will reply between
10am and 7pm, Monday to Saturday.

For more starting points, see our 12 AI auto-reply examples.

Knowing the limits up front saves surprises:

• It isn’t Meta’s official API. Wapzen links your number as a device, like WhatsApp Web. You don’t get a green tick or template broadcasts at API scale.
• One-to-one chats only. It doesn’t reply in groups, and it skips voice notes and photos sent without a caption.
• No flow builder. You guide the agent with plain-language instructions, not buttons and menus.
• No live transfer on calls. The voice agent handles the call itself; it can’t put the caller through to a person.
• WhatsApp calls only. The voice agent answers and makes WhatsApp calls, not regular phone calls.
• Your phone keeps the link alive. WhatsApp logs linked devices out when the phone isn’t used for about two weeks, so open WhatsApp on it now and then.

Answering people who message you is ordinary WhatsApp use, and that’s most of what an AI agent does. The risk comes from the other direction: messaging people who didn’t ask to hear from you. WhatsApp’s terms forbid bulk and automated messaging outside its Business Platform, and numbers that get blocked or reported are restricted.

So keep any bulk messages to customers who know you and expect them, leave a gap between sends, and give people a way to opt out. The bulk sending checklist covers it in detail.

A free AI agent isn’t the answer to everything:

• Large broadcast campaigns to opted-in lists, a verified green tick, or a team inbox for many agents: use a Business API platform. Compare the main ones in AiSensy vs Interakt and WATI pricing.
• Strict step-by-step flows with buttons, such as a loan application form: a flow builder is more predictable.
• A custom build with your own model and hosting: see the n8n WhatsApp AI agent guide.

If what you need is an assistant that answers customers well, around the clock, without counting messages, start with Wapzen.