AI virtual secretary: is it worth it for your company?
It is worth it when the volume of repeated contact is high. An AI virtual secretary answers on WhatsApp and books appointments. It separates who is close to buying and replies outside business hours. What it does not do is decide delicate cases or negotiation outside what was agreed.
CertuAI data: 32.5% of messages arrive outside business hours (122,720 messages from 67 businesses, Jul 30 to Sep 30, 2026). See the data
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
Bernardo Villela · CEO, CertuAI
The price of each plan, and what is in each one, is on plans and pricing. There is no long-term contract.
Summary in 7 facts
- It is worth it when the volume of repeated contact is high.
- An AI virtual secretary answers on WhatsApp and books appointments.
- It separates who is close to buying and replies outside business hours.
- What it does not do is decide delicate cases or negotiation outside what was agreed.
- An AI virtual secretary is an agent that answers on WhatsApp or on the website.
- It answers the questions that come up most, books and reschedules appointments, and sorts out people who arrive asking about price.
- An AI secretary does not negotiate discounts outside policy.
By the numbers
| Number | What it means |
|---|---|
| 32,5% | CertuAI data: 32.5% of messages arrive outside business hours (122,720 messages from 67 businesses, Jul 30 to Sep 30, 2026). |
| R$ 2.500 | A CLT secretary (Brazil's formal employment regime) on a R$ 2,500 salary usually costs the company R$ 4,000 to R$ 4,500 per month. |
What is an AI virtual secretary?
An AI virtual secretary is an agent that answers on WhatsApp or on the website. It answers the questions that come up most, books and reschedules appointments, and sorts out people who arrive asking about price. And it calls the team whenever someone needs human attention. It is not a canned-reply bot that freezes at any question off the script. Well configured, it uses the business's real information, the brand's way of speaking and the live calendar to decide what to answer.
- Answer common questions (opening hours, address, payment methods, services)
- Book, reschedule and cancel appointments directly in the calendar
- Qualify leads by asking the essentials before passing them to a salesperson
- Send appointment or meeting reminders to reduce no-shows
- Answer outside business hours and at night, with no overtime cost
- Hand off to a human when the conversation goes off script or the customer asks
What can an AI secretary not do?
An AI secretary does not negotiate discounts outside policy. It does not handle an angry customer well, who needs to be heard before any solution. And it does not replace the judgment of someone who has known the customer for years. A business that decides high-value deals, sensitive legal cases or health emergencies needs a person at the end of the conversation. Even when using the AI only for triage.
The biggest risk of a poorly configured AI is not that it is dumb. It is that it is overconfident. Replying out of the company's tone. Making up information. Promising what the business does not deliver. That destroys trust faster than a slow manual reply.
How much does a CLT, remote or AI secretary cost?
| Option | Hours covered | Strength | Main limitation |
|---|---|---|---|
| In-person CLT secretary | Business hours, one shift | Physical presence, judgment, trusting relationship | High fixed cost, does not cover nights/weekends |
| Outsourced remote secretarial service | Usually extended business hours | No employment tie, scales with volume | Depends on a third party following your script, delays at peak times |
| AI agent on WhatsApp | 24 hours, every day | Instant reply, predictable cost, scales without hiring more people | Does not handle emotional exceptions or negotiation outside the script |
Values change by city, industry and provider. They serve as a market reference in 2026. A CLT secretary with a R$ 2,500 salary usually costs the company R$ 4,000 to R$ 4,500 per month. That adds up charges such as INSS (social security), FGTS (severance fund), vacation and the 13th-month salary. Outsourced remote secretarial service changes in price by plan and included volume. At CertuAI, the AI agent on WhatsApp has no setup fee and no lock-in: the Start plan costs US$ 75 per month. It goes live the same day; what can take longer is the company verification by Meta, which runs in parallel.
To compare with what you spend today, calculate how much an employee costs with payroll charges.
How to choose between AI, remote and CLT by industry?
- Clinic: AI books, confirms and reminds about appointments to reduce no-shows; a human explains the procedure or calms an anxious patient.
- Real estate agency: AI qualifies who wants to visit the property and filters out the curious from serious buyers; the agent closes the negotiation.
- Law firm: AI does the initial screening (case type, urgency); the lawyer takes over the qualified case.
- E-commerce: AI answers order questions and recovers abandoned carts; a human steps in on a complex complaint.
- Auto repair shop: AI takes quote requests and books a time; the mechanic decides the final price of the service.
- Accounting: AI answers recurring questions (deadlines, documents) and books a meeting; the accountant advises on a specific tax matter.
Few small companies need to choose just one option. What usually pays off most is AI handling the repetitive and the after-hours. And a person taking over when the conversation requires negotiation, empathy at a difficult moment or a decision off the script. Before hiring, count three things. How many messages you receive per month. How many arrive outside business hours. And how many turn into a sale or appointment today. That number already shows whether you lack people or lack speed.
Want to see this working? The virtual secretary on WhatsApp page shows the routine she takes over and where the front desk stays. If your business is a clinic or practice, the WhatsApp chatbot for medical clinics page shows what the AI replies when a patient asks about scheduling, symptoms or exams.
Read also
- how much it costs to implement AI in customer service
- how to reduce no-shows with automatic confirmation on WhatsApp
- messages outside business hours: what to do with them
- what an AI agent is and how it helps your company
See the agent ready for your type of business
Frequently asked questions
- Does AI on WhatsApp completely replace a secretary?
- No. It replaces the repetitive volume of questions and after-hours customer service well, but delicate cases, negotiation and out-of-the-ordinary decisions still need a human in the conversation.
- Is it cheaper to have AI than to hire a CLT secretary (Brazil's formal employment)?
- In most cases yes, especially when you add CLT labor charges (INSS social security, FGTS severance fund, vacation, 13th-month salary). But the real comparison depends on your customer service volume and how complex your business's conversations are.
- Can the AI book appointments straight into my calendar?
- Yes. When connected to your scheduling system or calendar, it checks available times, books the appointment and sends a reminder automatically, without anyone having to check manually every day.
- What if the AI says something wrong to the customer?
- It is a real risk when the AI is not well configured with the company's data and tone. That is why it is important to limit what it can state and to define clearly when it should hand the conversation to a human.
Keep reading
In short
It is worth it when the volume of repeated contact is high. An AI virtual secretary answers on WhatsApp and books appointments. It separates who is close to buying and replies outside business hours. What it does not do is decide delicate cases or negotiation outside what was agreed. CertuAI data: 32.5% of messages arrive outside business hours (122,720 messages from 67 businesses, Jul 30 to Sep 30, 2026). See the data
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
