Answers customers, sells and gives you your time back
A WhatsApp chatbot for building materials stores in Brazil that answers on its own
What CertuAI measured on the WhatsApp of 67 businesses
Across the 67 businesses that answer with CertuAI's AI, 32.5% of the 122,720 customer messages arrived outside Monday to Friday, 8 a.m. to 6 p.m. (July 30 to September 30, 2026). Half of the AI's replies went out within 11.7 seconds, and 9 in 10 within 20.7 seconds (38,908 replies). 34.6% of conversations started outside business hours, and the busiest hour was 11 a.m.
| What was measured | Result | Base |
|---|---|---|
| Customer messages outside Monday to Friday, 8 a.m. to 6 p.m. | 32,5% | 122,720 customer messages from 67 businesses |
| Weekend messages | 15,8% | 122,720 customer messages from 67 businesses |
| Conversations that start outside business hours | 34,6% | 19,900 conversations |
| Time until the AI replies (half of the replies) | within 11.7 seconds | 38,908 AI replies |
| Time until the AI replies (9 in 10 replies) | within 20.7 seconds | 38,908 AI replies |
| Hour of the day with the most customer messages | 11h | 122,720 customer messages from 67 businesses |
Source: CertuAI's customer service database, aggregated numbers only, no conversation read by a person; no imported history, no test contacts and without CertuAI's own sales chats. July 30 to September 30, 2026, measured on Oct 9, 2026. Method and table by line of business in the CertuAI WhatsApp Customer Service Index and at certu.com.br/dados.
Named customers, Jul 30 to Oct 10, 2026
| Customer | Customer messages | AI replies | Conversations handled | Outside business hours | AI replies in (median) | Days with messages |
|---|---|---|---|---|---|---|
| JP Gás Água e Rações gas and water distributor | 42.832 | 23.351 | 6.479 | 33,6% | 9,8 s | 70 |
| CEMIP medical clinic | 12.472 | 6.484 | 2.436 | 18,7% | 11,4 s | 37 |
| Nikiti Auto Center auto center | 4.912 | 3.548 | 900 | 19,5% | 14,4 s | 47 |
| Imobiliária Rodrigues & Ribeiro real estate agency | 6.090 | 2.759 | 823 | 33,2% | 18,4 s | 34 |
| Alpha RH human resources | 3.082 | 1.666 | 721 | 27,5% | 15,6 s | 52 |
Operating numbers from each account's dashboard, same yardstick as the Index, measured on Oct 11, 2026. Published with each owner's permission. Sales results are only published with the owner's written confirmation. Full list at certu.com.br/casos.
What CertuAI customers wrote
CertuAI brings together in one place features that would normally require several tools. Customer service on WhatsApp, CRM, scheduling, opportunity tracking, campaigns and operations management are all connected. Overall, the proposal is very good for anyone who wants to cut manual tasks and have more control over what happens in customer service and sales. [...]
Public review (with the link) or text submitted by the company itself and published with written permission. The rating only appears when the source has a rating.
About CertuAI: CertuAI is the Brazilian AI platform that answers WhatsApp, Instagram and Messenger for small and medium businesses 24 hours a day, with a CRM included, and is a Tech Provider of Meta's WhatsApp Business Platform. Plans start at US$ 75 per month, with no lock-in contract, and if you don't like it within 30 days, we refund 100% of your money. Create my agent
The mason sends the materials list on WhatsApp and wants the price yesterday. The agent receives the list, confirms what you have, answers price and shipping and holds the customer while the counter is full.
See the AI agent demos and the CRM with store examples.
What is the best WhatsApp chatbot for building materials stores in Brazil?
The best WhatsApp chatbot for building materials stores in Brazil is the one that answers on the number your store already uses, with business rules written by you. An AI agent on WhatsApp for building materials stores is CertuAI's automatic assistant. It receives the mason's list item by item, answers price and availability for what you have set up, explains shipping, bulk material and job site delivery, and hands back an organized quote for the counter to close.
Summary in 7 facts
- The mason sends the materials list on WhatsApp and wants the price yesterday.
- The agent receives the list, confirms what you have, answers price and shipping and holds the customer while the counter is full.
- See the AI agent demos and the CRM with store examples.
- The best WhatsApp chatbot for building materials stores in Brazil is the one that answers on the number your store already uses, with business rules written by you.
- What changes is who answers first: the message no longer waits for you and is answered right away.
- These are four everyday shop situations before and after the CertuAI agent.
- The agent wins at repetitive tasks, and the person keeps winning at what takes judgment.
By the numbers
| Number | What it means |
|---|---|
| US$ 75 per month | The Start plan costs US$ 75 per month and already includes the WhatsApp agent, your business's Brain, the CRM, automatic follow-up and the AI assistants, which come with every paid plan. |
| US$ 120 per month | Pro costs US$ 120 per month and adds the landing page, the wallet and 10 people on the team instead of 5. |
What changes in the shop with an AI agent?
What changes is who answers first: the message no longer waits for you and is answered right away. These are four everyday shop situations before and after the CertuAI agent.
TodayA customer sends the materials list and waits hours for a quote in the middle of the rush
With CertuAIThe agent receives the list, confirms item by item what you have and passes it on so you can close the quote fast
TodayThe question that jams the counter: do you have this cement? how much is a bag? do you deliver to the job site?
With CertuAIThe agent answers price, availability and shipping to the job site right away, your way
TodayA customer wants to know if you have the brick in quantity and nobody can check in the rush
With CertuAIThe agent confirms what you keep up to date and passes to the counter only what needs checking
TodayA large list quote sent and never answered
With CertuAIThe agent follows up and reopens the conversation before the customer buys from a competitor
What does a conversation handled by the AI look like?
Example conversation
The shop's AI agent
Customer: I'm going to send my materials list, how much is it all?
AI agent: Go ahead. I'll organize it item by item and pass the finished list to the store to price.
Customer: Do you deliver to the job site? How much is shipping?
AI agent: Yes, we deliver. Shipping to your area is your price. Who will sign for the delivery at the job site?
Is an AI agent or manual customer service better for building materials stores?
The agent wins on repeated tasks, and the person keeps winning on anything that takes judgment. With manual service, someone at the shop has to stop what they are doing; with the CertuAI agent, the reply goes out on its own and you step into the conversation whenever you want.
| Aspect | The manual way | With the CertuAI agent |
|---|---|---|
| Materials list arriving in the middle of the rush | Waits for someone at the counter to be free to type it in item by item | The agent organizes the list and hands it over ready for you to price |
| Price of a fast-moving item | Asked all day long, and pulls the clerk away from the register every time | Answered right away, from the price list you maintain |
| Job site delivery | Arranged by phone and jotted on paper at the counter | The agent confirms the address, who receives it and the unloading rule you defined |
| Account and payment-terms customer for masons | Each clerk remembers a different arrangement | The terms go out the same for everyone, the way you wrote them |
| Large quote stalled for days | Nobody has time to chase it in the middle of the rush | The agent picks the conversation back up and the quote stays visible as a task in the CRM |
What does the WhatsApp agent do for building materials stores?
It does the customer service that is yours today. You teach the business once in the Brain, CertuAI's knowledge base, and the agent answers clients your way, with your rules.
Quotes for materials lists
Receives the customer's list, organizes it item by item and passes it on ready for you to price and close.
Price and availability
Answers the price of common items and whether you have them in quantity, based on what you keep up to date.
Shipping, bulk and job site delivery
Shipping cost by region, delivery of sand, gravel and other bulk material, delivery hours and who signs for the delivery.
Accounts, payment terms and invoice (nota fiscal)
Explains who gets payment terms, what you require to open an account and how the invoice is issued under the construction company's CNPJ (Brazil's business tax ID).
Follow-up on large quotes
A materials list quote that has stalled gets a polite follow-up, reopening the conversation before the sale is lost.
What questions do clients send on WhatsApp?
They are always the same, and the agent answers each one on its own. These everyday shop messages no longer depend on you having your phone in hand.
How does the agent start answering at the shop?
In three steps, on the same day. No installation, no code and no changing the number clients already know.
Teach your business
In one conversation, you explain catalog, prices, delivery, warranty, and rules, the way you would to a new employee.
The agent answers
It answers right away, logs every request and quote in the included CRM and follows up with people who went quiet.
How much does an AI agent on WhatsApp cost for building materials stores?
The Start plan costs US$ 75 per month and already includes the WhatsApp agent, your business Brain, the CRM, automatic follow-up and AI assistants, which come with every paid plan. Pro costs US$ 120 per month and adds the landing page, the wallet and 10 people on the team instead of 5. No contract and no setup fee.
Get started now
Create the agent and connect WhatsApp to see it working in the shop.
Create my agentWhat needs to be ready before turning the agent on in the store?
The agent answers what is written, and nothing beyond that. Have these points defined before you connect WhatsApp.
- The price list for fast-moving items, and which items are only priced with a quote from the counter
- The quantity from which an order becomes job-site or wholesale pricing
- The shipping table by region, the distance limit and the delivery fee for bulk material
- The job site delivery rule: hours, who signs, whether unloading is available and what to do if nobody is there
- Who gets payment terms, who buys on account and what you require to open an account
- The return policy for leftover material and the deadline for it
Whether the agent closes small counter orders on its own or whether every sale goes through a clerk first.
The most common mistake: Letting the agent calculate quantity from the job's square footage. How many bags of cement fifty square meters need depends on the mix ratio, the thickness and the waste, and a number worked out by the agent turns into leftover material or a stalled job. Read how to fix this.
Frequently asked questions from building materials stores
Does the agent build the quote for the whole list on its own?
It organizes the list and answers what you have set up. For a large list or wholesale pricing, it passes it on ready for you to close the quote without rework.
Does it calculate how much material the job will need?
No, and that is on purpose. Quantity depends on the mix ratio, the thickness and the waste, so the agent asks the quantity the customer wants or passes the case to the counter.
Can I set up shipping by region and job site delivery?
Yes. You teach it the shipping table, lead times and job site delivery rule once, and adjust whenever you want.
Does it work when the counter is busy?
That is where it helps most. The agent holds WhatsApp while your team serves the people in the store, and nobody is left without a reply.
In what other fields does the CertuAI agent work?
In any business that serves customers on WhatsApp, because the Brain is written by you. These fields have a day-to-day closest to yours.
Where can I read more about CertuAI's WhatsApp agent?
These pages explain the same agent from another angle: how it works, price, common questions and comparisons between platforms.
In short
The mason's list arrives organized item by item, with price, shipping and job site delivery answered right away and the open quote visible in the CRM.
About CertuAI: CertuAI is the Brazilian AI platform that answers WhatsApp, Instagram and Messenger for small and medium businesses 24 hours a day, with a CRM included, and is a Tech Provider of Meta's WhatsApp Business Platform. Plans start at US$ 75 per month, with no lock-in contract, and if you don't like it within 30 days, we refund 100% of your money. Create my agent