How does "comment LINK and I'll DM you" work on Instagram?

!Pink vending machine turns a dropped token into an envelope, illustrating Instagram comment keyword to DM automation

Someone comments a keyword like "LINK" on your post, and a tool connected through Instagram's API sends them a DM with your link, usually with a public reply on the comment too. Instagram's own app can do this for one link; for more keywords, you connect a tool. BetterSocials runs it with a keyword and the message you write, no flow builder, at a flat price with unlimited keywords and contacts.

The short answer

Pick a word, connect a tool to your Instagram account, and ask people to comment the word. The tool sends each of them the DM and can reply under their comment.

ManyChat and BetterSocials both do this. ManyChat bills by active contacts. BetterSocials charges a flat price and also answers keyword comments on TikTok, YouTube and Threads, with the link in a public reply.

How does "comment LINK and I'll DM you" work, and what tool does it?

It has three parts.

The keyword. Something short like "LINK" or "GUIDE", asked for in your caption or video.

The connection. The tool connects through Instagram's API, the official route Meta gives outside apps, and you sign in on Instagram's own screen.

The trigger. When the word shows up in a comment, the person gets a DM with your link. The tool can also reply under the comment, so the next viewer sees the ask was answered.

It spread because every "LINK" under a post is public proof that other people wanted the thing, and the DM hands it over without a trip to your bio.

What is the best tool to run a comment-for-link lead magnet on Instagram?

It comes down to how many people will comment and where else they comment.

ManyChat bills by "Active Contacts" per month. Pro is $29 a month billed annually, or $39 month-to-month, for 2,500 contacts (pricing read July 2026). Each extra contact costs $0.05 on monthly billing or $0.038 on annual, charged monthly even on an annual plan, so a post that takes off shows up on that month's bill.

BetterSocials is flat. Creator is $29 a month, or $24 a month billed yearly, and every plan has unlimited contacts, DMs and keyword automations. If 10,000 people comment "LINK", the price doesn't change.

ManyChat covers Instagram, TikTok, Facebook Messenger, Telegram, WhatsApp, SMS and email, and has no YouTube channel (channels read September 2026). BetterSocials sends the keyword DM on Instagram and Facebook. On TikTok, YouTube, Threads and LinkedIn company pages, it answers the keyword with a public reply that carries the link.

If you need WhatsApp, Telegram or SMS, pick ManyChat; BetterSocials doesn't do those. If your comments also come from YouTube or TikTok, BetterSocials answers them in the same inbox as Instagram.

How do I send a link in someone's DMs when they comment a keyword on my post?

Five steps, no flow diagram.

Connect your account

Open Connected Accounts in BetterSocials, pick Instagram and sign in on Instagram's screen. The setup guide walks through it.

Pick your keyword

Use one short word, like "LINK" or "GUIDE". People type a single word the same way every time. A phrase picks up typos.

Write the message it sends

Write the DM like a text to a friend: a line or two and the link. Then write the reply that goes under the comment.

Publish and post

Put the keyword in your caption or say it in the video, then publish. New comments with that word get the DM and the reply.

Watch the inbox

Comments and DMs land in one inbox, including what people send back. Answer those inside Instagram's 24-hour reply window.

Is comment-to-DM an official Instagram feature, or do you need a third party tool?

Both exist. Instagram has a native comment-to-DM option that sends one link, which is fine for a single offer. We compared it with ManyChat in Instagram's free comment-to-DM vs ManyChat.

For more keywords, or comments from other platforms in one place, you connect a third party tool. Check how it connects. A tool that logs in as you and clicks around the app puts your account at risk. One that uses Instagram's API goes through the route Meta built for outside apps and has to follow Instagram's limits. BetterSocials uses the API.

How does BetterSocials compare with ManyChat for comment-to-DM?

The trigger is the same: a keyword comment, a DM, and a public reply if you want one. They split on price, contacts and platforms.

For an Instagram-only funnel with a small list, ManyChat Pro is a reasonable price. Past 2,500 contacts a month, or once YouTube and TikTok comments matter, BetterSocials is the better fit. The full breakdown is on the ManyChat comparison page.

How BetterSocials does this

One inbox holds comments from Instagram, Facebook, TikTok, YouTube, Threads and LinkedIn company pages, plus DMs from Instagram, Facebook and TikTok.

A keyword is a word and the message it sends. There's no builder and no cap on how many keywords you run. On Instagram and Facebook the keyword sends the DM and posts your reply; everywhere else the link goes in the public reply. Tracked links (in beta) show which comment or DM led to a click.

The keyword reply is the message you wrote, word for word. Other comments and DMs get AI drafts in your voice, built from your past replies. Drafts wait for your approval unless you set a rule that lets that kind of reply send on its own. More on the comment-to-DM page and the inbox page.

Plans start at $29 a month, or $24 a month billed yearly. Start a 7-day free trial (card required) or compare plans at bettersocials.ai/pricing.