AI SMS Chatbot Guide: Platforms, Costs & Compliance (2026)
On this page8 sections
- What an AI SMS Chatbot Actually Does
- SMS vs WhatsApp: What Each Message Costs
- Quick Comparison at a Glance
- The Best AI SMS Chatbot Platforms
- 1. Intercom Fin — Best for Teams Already Running a Help Desk
- 2. Freshchat — Best Value for SMS and WhatsApp Together
- 3. Gorgias — Best for Ecommerce Support by Text
- 4. ManyChat — Best for WhatsApp-First Businesses
- 5. Botpress — Best for Building a Custom Agent on Twilio
- Compliance Checklist Before You Go Live
- How to Choose
- Frequently Asked Questions
- What is an AI SMS chatbot?
- How much does an SMS chatbot cost per message?
- Do I need 10DLC registration for an SMS chatbot?
- Is WhatsApp cheaper than SMS for customer support?
- Can ChatGPT reply to text messages for my business?
- Final Verdict
The best AI SMS chatbot for most teams is the one inside the help desk you already use. Intercom's Fin is the strongest: one agent answers on SMS and WhatsApp, and you pay per resolution. Freshchat is the best value, Gorgias wins for ecommerce, and Botpress suits custom builds on Twilio.
- A US SMS segment costs roughly $0.011-$0.013 each way, and long AI replies are billed as multiple segments
- WhatsApp replies stop being free on October 1, 2026: 1,000 free per number each month, then $0.0034 each in North America
- US texting needs 10DLC or toll-free registration before anything is delivered, and registration doesn't replace TCPA consent
- Check channel support first: Tidio has no SMS, and Intercom's US SMS only works on toll-free numbers
Your customers would rather text you than open a chat widget. But "put an AI on SMS" hides two things vendors skip: every message has a price, and US carriers won't deliver a single text until your number is registered.
The short answer: turn on the SMS and WhatsApp channels in the help desk you already use, and let its AI agent answer there. Below you'll find how an AI SMS chatbot works, what each message costs on SMS versus WhatsApp, five platforms worth shortlisting, and a compliance checklist. For the wider buying decision, see our guide to conversational AI for customer service.
What an AI SMS Chatbot Actually Does
An AI SMS chatbot reads an incoming text, works out what the customer wants, answers from your help content or order data, and replies in the same thread. That's different from SMS automation (shipping alerts, reminders, login codes), which goes out one way and doesn't expect a reply.
SMS bots handle order status, opening hours, bookings, and delivery windows well. They should hand refund disputes and complaints to a person. Our guide to which support workflows you can fully automate covers where that line sits.
SMS vs WhatsApp: What Each Message Costs
Here's what the messages themselves cost, before any platform or AI fee is added:
| Cost item | SMS (US, via Twilio) | WhatsApp (North America) |
|---|---|---|
| Customer's message to you | $0.0083 per segment + carrier fee ($0.0025-$0.0035) | Free |
| Your bot's reply | $0.0083 per segment + carrier fee ($0.0035-$0.0045) | 1,000 free per number per month, then $0.0034 (from Oct 1, 2026) |
| Message you start | Same rate, needs prior consent | Approved template: utility $0.0034, marketing $0.025 |
| Phone number | $1.15/month (10-digit), $2.15 (toll-free) | Through your provider |
| Registration | 10DLC: ~$4-$15 upfront + ~$10/month per campaign | Meta business verification + opt-in |
Watch the segment count. One segment holds 160 characters. A 480-character AI answer is three segments, and a single emoji drops the limit to 70 characters. Tell your bot to keep SMS answers short.
A worked example. Say you handle 1,000 conversations a month, each with three customer texts and three bot replies of about two segments:
- SMS: 3,000 inbound segments at ~$0.011 plus 6,000 outbound at ~$0.012 comes to roughly $108 a month
- WhatsApp: inbound is free. The first 1,000 of your 3,000 replies are free and the other 2,000 cost $0.0034 each, about $6.80 a month
On either channel, the platform's AI fee usually costs more than the messages. That's why the platform choice matters more.
Quick Comparison at a Glance
| Platform | SMS | AI pricing | Starting price (USD/mo) | |
|---|---|---|---|---|
| Intercom (Fin) | Yes (US toll-free only) | Yes | $0.99 per resolution | $29/seat (annual) |
| Freshchat | Yes, via Twilio or Gupshup | Yes | 500 sessions included, then $49 per 100 | $19/agent (annual) |
| Gorgias | Paid add-on | Yes (AI in beta) | $0.90-$1.00 per interaction | $10 |
| ManyChat | Via your Twilio account | Yes | Included from Pro | $29 (annual) |
| Botpress | Via Twilio integration | Plus and up | Credit included on paid plans | Free; Plus $150 (annual) |
If you want both channels with AI included for the lowest monthly bill, start with Freshchat.
The Best AI SMS Chatbot Platforms
1. Intercom Fin — Best for Teams Already Running a Help Desk
Intercom's Fin is one AI agent across web chat, email, SMS, and WhatsApp. You connect SMS and WhatsApp as chat channels and Fin answers there, adjusting its SMS replies: no source links or buttons, and a 1,600-character cap.
- One knowledge base across every channel
- Per-resolution billing, so failed attempts aren't charged
- Built-in SMS consent and opt-out management
Pricing: seats from $29/seat/month billed annually | Fin $0.99 per resolution | SMS billed separately by usage
Best for: support teams that want one AI agent everywhere instead of a separate SMS bot.
Not ideal for: US businesses that want a standard 10-digit number. Intercom's US SMS only supports toll-free numbers. Also note that Fin has been owned by Salesforce since September 2026.
2. Freshchat — Best Value for SMS and WhatsApp Together
Freshchat's Growth plan puts SMS (through a Twilio or Gupshup account) and WhatsApp in the same inbox as web chat, with 500 Freddy AI sessions a month included. It's the cheapest way here to get both channels with AI.
- SMS, WhatsApp, LINE, and web chat in one inbox
- 500 AI sessions included on paid plans
- Free plan for up to 10 agents (web chat only)
Pricing: Free (no SMS or AI agent) | Growth $19/agent/month | Pro $49 | Enterprise $79 (annual) | extra sessions $49 per 100
Best for: small teams that want both texting channels without an enterprise contract.
Not ideal for: teams with many abandoned chats, because you pay per session whether or not the AI solved anything.
3. Gorgias — Best for Ecommerce Support by Text
Gorgias is the help desk many Shopify stores already run. Its AI Agent uses the same knowledge across chat, email, SMS, and WhatsApp (still in beta), and pulls live order data, so "where's my order?" texts get a real answer. Our AI chatbot for ecommerce guide covers its Shopify side.
- Shopify order data inside every ticket
- WhatsApp numbers matched to customer profiles
- Voice and SMS as add-ons to any plan
Pricing: Starter $10/month | Basic $60 | Pro $360 (monthly) | AI Agent $1.00 per automated interaction ($0.90 annual) | SMS add-on priced by volume
Best for: Shopify stores whose customers text about orders.
Not ideal for: non-ecommerce businesses.
4. ManyChat — Best for WhatsApp-First Businesses
ManyChat is strongest on WhatsApp, Instagram, and Messenger, with AI replies included from Pro. SMS is weaker: you connect your own Twilio account, Twilio bills you directly, and the channel suits flows and follow-ups better than open-ended AI conversation.
- Visual flow builder for WhatsApp and social DMs
- AI replies that understand intent, not just keywords
- SMS broadcasts through your own Twilio account
Pricing: Pro from $29/month billed annually ($39 monthly) | Twilio and Meta fees extra
Best for: businesses whose customers mostly message on WhatsApp.
Not ideal for: teams that need a ticketing inbox behind the bot.
5. Botpress — Best for Building a Custom Agent on Twilio
Botpress lets you build your own AI agent, connect it to your data, and deploy it over SMS and WhatsApp through its Twilio integration. You get the most control, but the Twilio account, number registration, and testing are all on you.
- Visual builder, with code where you need it
- Connects to your own APIs and databases
- AI usage credit included on paid plans
Pricing: Free (25 conversations/month, no WhatsApp) | Plus $150/month | Team $750/month (annual)
Best for: teams with technical help that want a bot tailored to their systems.
Not ideal for: anyone who wants to be live this week.
One note on Tidio: its Lyro AI answers on WhatsApp, but Tidio has no SMS channel.
Compliance Checklist Before You Go Live
- Register your number. Standard 10-digit US numbers need 10DLC brand and campaign registration. Twilio has blocked all unregistered 10DLC traffic since September 2023, and still charges for the blocked messages. Brand approval takes 2-5 business days and campaign approval takes 1-4 weeks. Toll-free numbers need toll-free verification instead.
- Keep AI replies inside your registered use case. Carriers check traffic against the sample messages you registered, so a support-only campaign shouldn't send promotions.
- Get written consent for promotional texts. Use a separate, unticked SMS checkbox that names your brand, the message purpose and frequency, "Msg & data rates may apply," and STOP/HELP.
- Honour STOP immediately. Send marketing texts only between 8am and 9pm in the recipient's time zone.
- Collect WhatsApp opt-in too. You need opt-in before sending any template. Free-form replies are only allowed within 24 hours of the customer's last message.
- Registration isn't consent. 10DLC covers the carriers, not the TCPA. Regulated industries should get a legal review.
How to Choose
- Already on a help desk: switch on its texting channels. That means Intercom on Intercom, Freshchat on Freshworks, and Gorgias for Shopify.
- Customers mostly on WhatsApp: ManyChat or Freshchat.
- US SMS at scale with custom logic: Botpress plus your own Twilio account.
- You want a full help desk, not just a bot: browse our AI customer support tools.
- Not sure texting is worth it: compare it with web chat in our chatbot vs live chat breakdown, or see our picks for the best chatbot for small business if budget is tight.
Frequently Asked Questions
What is an AI SMS chatbot?
A bot that receives customer texts, understands them with a language model, and replies in the same SMS thread. Unlike one-way reminders or passcodes, it holds a conversation and hands off to a human when it can't help.
How much does an SMS chatbot cost per message?
In the US, roughly $0.011-$0.013 per 160-character segment in each direction, once Twilio's $0.0083 rate and carrier fees are combined. The platform's AI fee comes on top.
Do I need 10DLC registration for an SMS chatbot?
Yes, if you text from a standard 10-digit US number. Toll-free numbers need toll-free verification instead.
Is WhatsApp cheaper than SMS for customer support?
Usually. Inbound messages are free, and from October 1, 2026, replies cost $0.0034 in North America after 1,000 free per number each month. Messaging a customer outside the 24-hour window needs a paid template.
Can ChatGPT reply to text messages for my business?
Not on its own. You need an SMS provider like Twilio plus a platform such as Botpress to connect the two, or a help desk with SMS-ready AI built in, like Intercom Fin or Freshchat.
Final Verdict
If your customers use WhatsApp, start there: it's cheaper, it supports images and buttons, and inbound is free. Add SMS for customers who won't install another app. For the platform, Intercom Fin is the most capable if you're already on Intercom, and Freshchat Growth is where I'd send most small teams.
One practical tip from me: start your 10DLC registration before you build the bot. The paperwork takes longer than the bot does.