Auto-reply to Facebook comments and Messenger DMs (2026)
Auto-reply to Facebook comments and Messenger DMs with Meta Business Suite, ManyChat or BetterSocials, and the 7-day private reply rule every tool follows.
By Demand Memo staff7 min readUpdated Nov 8, 2026
You can reply to Facebook Page comments and Messenger DMs automatically in three ways. Meta Business Suite is free and sends fixed keyword templates. ManyChat is best for multi-step Messenger flows. BetterSocials is best for keyword DMs plus AI replies in your voice, from one inbox, at $29 a month for four accounts. Whichever you pick, Meta's rules decide what can be sent and when.
Two routes to automatic replies on a Facebook Page
Meta Business Suite and the third-party tools all send through the same Meta rules, so we wrote this memo as a rules explainer. The tool you pick changes the wording and the price. It doesn't change the windows, the counts or who may send.
The first route is Meta's own. It costs nothing and sends a template you wrote yourself. The second route is a tool such as ManyChat or BetterSocials, which adds flows, AI drafting or one inbox for several platforms.
Our assumptions are simple. You post from a Facebook Page, not a personal profile. You hold the Page permissions Meta asks for. And a comment or DM that waits too long is a buyer you lose.
Setting up free auto-replies in Meta Business Suite
Meta Business Suite includes a comment-to-message automation at no charge, as of July 2026. It sends a Messenger reply when a comment on your post contains keywords or phrases you set.
The setup runs on a desktop:
- Open Meta Business Suite on a computer, because the automation is set up on desktop only.
- Turn on instant replies for Page messages. Facebook's help page, Turn instant replies to Page messages on or off, covers the switch.
- Create a keyword automation for comments and write the message it sends.
- Add your keywords. Each automation takes up to 5, and matching is case-sensitive.
Two limits shape the result. The message is a fixed template you write, or Meta Business Agent, with no AI drafting of your own replies. And a keyword automation can wait 15 minutes before sending, unless you reply first.
For one Page with a handful of keywords, Meta Business Suite is enough. It covers Messenger, Instagram, WhatsApp and comments on your Facebook and Instagram posts.
Sending a Messenger DM to someone who commented
Meta Business Suite lets you message a commenter by hand from its Inbox. On a Facebook comment you can react, reply, "Send message", delete, "Hide comment" or report, per Facebook's guide to comment actions in Inbox.
The same page sets the clock. "You can't send a message in response to comments posted more than 7 days ago." It also sets who may act: "You need community activity permissions for a Facebook Page or Instagram account to be able to review and respond to comments on its posts."
To send that DM automatically, you need a keyword. Someone comments a word such as GUIDE, and the tool sends a Messenger DM with your link. Meta's free automation does this with a template. ManyChat and BetterSocials do it too, with different trade-offs on price and setup.
What ManyChat's Facebook Comments Trigger adds
ManyChat's Facebook Comments Trigger starts a Messenger conversation from a comment on your post. You can trigger it by keyword or build a multi-step flow in ManyChat's flow builder. ManyChat works on Instagram, Messenger, WhatsApp and TikTok.
Pick ManyChat if you want multi-step sequences or WhatsApp in the same tool. Its entry price is lower than BetterSocials. ManyChat starts at $14 a month on annual billing, or $17 billed monthly, as of July 2026.
The bill is metered by active contacts, meaning each person who interacts with your automations. ManyChat Pro is $39 a month with 2,500 active contacts, as of October 2026. Each extra contact costs $0.05 on Pro, billed monthly. So a Pro account that reaches 4,000 people in a month pays the $39 plus 1,500 extra contacts at $0.05 each, a bill a little over a hundred dollars.
For a Page where one post can pull thousands of comments, that meter is the cost to model. A flat plan costs the same in a quiet month and a busy one.
The limits every tool inherits from Meta
Meta's rules for Facebook Pages apply to Meta Business Suite, ManyChat, InstantDM and BetterSocials alike, because every tool on the official API sends through Meta. The rules below come from Facebook's help pages and the vendors' own pages, read between July and October 2026.
| Rule | Limit | Applies to |
|---|---|---|
| Private reply to a comment | One per comment | Every tool |
| Private reply window | 7 days after the comment | Every tool |
| Public comment reply | No time limit | Every tool |
| Meta keyword automation | 5 keywords, case-sensitive | Meta Business Suite |
| Meta automation delay | Up to 15 minutes | Meta Business Suite |
A private reply is the DM a Page sends to someone because of their comment. Meta allows one, within 7 days of the comment. After that, a public reply under the comment still works.
None of this is a reason to wait. The 7-day window means a comment from last week may already be past the point where a DM can go out.
Which option fits your Page in 2026
BetterSocials, Meta Business Suite, ManyChat and InstantDM all send a Messenger DM from a Facebook comment keyword. The table compares them on prices seen between July and October 2026. InstantDM's figures are from September 2026, when its free plan had 500 credits a month.
| Tool | Starting price | Billing basis | AI replies | Best for |
|---|---|---|---|---|
| BetterSocials | $29 a month, 4 accounts | Flat, unlimited contacts | Trained on your past replies | Comments and DMs on several platforms |
| Meta Business Suite | Free | Free | None, fixed templates | One Page, a few keywords |
| ManyChat | $14 a month, annual | Per active contact | Instagram comments, in beta | Multi-step flows and WhatsApp |
| InstantDM | Free, 500 credits | Free tier, then paid plans | ChatGPT, Claude or Gemini agents | Instagram and Facebook keyword DMs |
Meta Business Suite costs nothing, as does InstantDM's free plan, and for one Page Meta may be all you need. What a paid tool buys is AI drafting, one inbox and keyword DMs across more platforms. InstantDM's Facebook Page post and Reel comment-to-DM isn't on its free plan, and its AI agents aren't trained on your own past replies.
What we would do: start with Meta Business Suite for a single Page and a few keywords. Move to a paid tool when your comments and DMs bring in customers on more than Facebook, or when the template reads like a template.
How BetterSocials handles Facebook comments and Messenger DMs
BetterSocials puts Facebook Page comments and Messenger DMs in one inbox, next to Instagram, TikTok, YouTube, Threads and LinkedIn Company Page comments. Setup takes about ten minutes, by its own help page.
The steps:
- Connect the Facebook Page under Connected Accounts. You sign in on Facebook's own screen.
- Write a keyword under Comment to DM. One screen with five fields sets the accounts, the word, the public reply, the DM and its link, and an AI switch.
- Choose a setting for Comments and for DMs under Settings, then AI voice: Off, Draft for me, or Reply in my voice.
On Reply in my voice, everyday comments get an answer under the comment 1 to 5 minutes later. A Messenger DM gets an answer about a minute after it arrives. Questions wait in Needs reply unless you turn on Answer questions too, which needs at least one AI rule first, such as your prices, hours or booking link.
When your AI rules don't cover what someone asked, the AI doesn't guess. The comment or DM waits for you in Needs reply. After five AI replies in one conversation in a day, the rest wait for you as well.
Creator is $29 a month for four accounts, one login and 1,000 AI credits a month. Pro is $49 a month for six accounts and 2,000 AI credits. Team is $99 a month for twelve accounts and unlimited teammates. Every plan has unlimited contacts and keywords, and a 7-day free trial with a card.
FAQ
Can Meta Business Suite send a Messenger DM to people who comment on my Facebook post?
Yes. Meta Business Suite has a free comment-to-message automation that sends a Messenger reply when a comment contains a keyword you set. Setup is on desktop, the message is a fixed template, and each automation takes up to 5 case-sensitive keywords. It can wait 15 minutes before sending unless you reply first.
How long do I have to send a private message to someone who commented?
Meta gives a Page seven days. It allows one private reply per comment, within 7 days of the comment being posted, and Facebook's help page says you can't message someone about a comment older than that. Public replies under the comment have no time limit.
Does ManyChat work with Facebook comments and Messenger?
Yes. ManyChat's Facebook Comments Trigger starts a Messenger conversation from a comment, by keyword or through a flow you build. ManyChat Pro is $39 a month with 2,500 active contacts, and each extra contact costs $0.05, so the bill grows with every new person who comments.
Can AI answer Messenger DMs for my Facebook Page?
Yes. In BetterSocials, set the DMs section of AI replies to Reply in my voice and a Messenger DM gets an answer about a minute after it arrives. When your AI rules don't cover the question, the DM waits for you in Needs reply.
How do I turn on instant replies for my Facebook Page messages?
Instant replies are a free Meta setting for Page messages. Facebook's help page, Turn instant replies to Page messages on or off, walks through the switch. For answers that change with each question, a tool such as BetterSocials drafts each reply in your voice.
How much does it cost to auto-reply to Facebook comments and DMs?
Meta Business Suite is free. ManyChat Pro is $39 a month for 2,500 active contacts plus $0.05 per extra contact. BetterSocials Creator is $29 a month for four accounts with unlimited contacts and a 7-day free trial.