Instagram comment auto reply, written by AI in your brand's voice

It’s 11:40 p.m. and someone asks under your latest reel whether the chocolate cake comes gluten free. If nobody answers until tomorrow, that sale goes cold. There are two ways to set up an Instagram comment auto reply: a rule that always sends the same text when a keyword shows up, or an AI that reads the comment and replies in your brand’s voice. HeyMark does both. This page covers when to use each one, and when it’s better not to auto reply at all.

Two kinds of Instagram comment auto reply

Fixed keyword replies. You set the word (“price”, “menu”, “link”) and the text. They’re predictable, spend no credits and come with every plan. They work when you know what people will ask and what you’ll answer, as with Instagram DM automation.

Generative AI replies. This is what people mean by an AI reply to comments: the AI reads each comment and writes a new answer in your brand’s voice, learned from what you’ve already published. It covers what you can’t predict: the gluten question, the “do you ship to other cities?”, the compliment that deserves more than “thanks”. Each reply uses 1 credit.

What we recommend is using both: rules for your campaign promises, AI for the everyday conversation.

What a good reply looks like

A bakery gets this comment on its reel: “Can I order the chocolate cake gluten free? My daughter has celiac disease.”

The first one answers the question, gives a concrete detail, doesn’t promise what the bakery can’t guarantee, and offers a next step. The second could sit under any comment on any brand’s post.

To answer like the first one, the AI has to know what your brand knows. It learns the voice from your posts. Details that aren’t in them, like lead times, prices or shipping policies, are worth adding to the brand profile so it doesn’t have to guess.

Approval and handoff to a person

Auto replying doesn’t mean replying without control. In HeyMark:

• You pause the AI in a conversation when you want to answer yourself, and resume it when you’re done.
• What needs a person gets escalated. The conversation goes on the escalation list for human attention, and whoever resolves it decides how it continues.
• From your assistant, nothing goes out without a preview. If you ask Claude or ChatGPT to reply to a comment, it shows you the text and waits for your approval before posting it.
• Moderation is separate. Comments you chose to moderate are hidden or held for review, and deleting one from the platform requires your approval. More in comment moderation.

To see how this fits with the rest of the work, see what an AI agent for social media does.

When not to auto reply

However good an automatic reply is, it makes these worse:

• Complaints. An order that arrived wrong needs someone who can fix it, not a well-written apology.
• Legal or health questions. A wrong answer about an allergen, a treatment or a contract has consequences.
• A crisis. If a post went viral for the wrong reason, every automatic reply adds fuel to the fire.
• Details that change daily. Stock, today’s prices, holiday hours.

In those cases, let the conversation escalate to your team, pause the AI where needed and, if the crisis is big, pause your automations too. Escalations and pauses are handled from the unified social inbox or from your assistant.

How many credits it uses

Each AI reply or DM uses 1 credit. Keyword rules use none.

Plan	AI credits a month	What that covers
Creator, $12 USD a month	500	500 AI replies, or 400 if you also use 10 Mark turns
Company, $30 USD a month	3,000	3,000 AI replies
Platform, quoted	25,000	Unlimited comment replies

Each Mark turn uses 10 credits. If you run short, you can turn on extra credits at $0.01 USD each; they’re off by default.

What Metricool, Buffer and Hootsuite do

Fact	HeyMark	Metricool	Buffer	Hootsuite
AI on comments and DMs	Replies to comments and DMs with AI in your brand's voice, with approval and handoff to a person. On every plan	No documented AI replies in the inbox. Its assistant drafts copy with 5 to 35 credits per brand a month	Suggests AI replies that learn your voice (Community). 5 a week on the free plan	AI-assisted replies in its inbox (Nest); automates replies from Professional
Comment-to-DM automation	Included on every plan, no credits spent: keyword public reply and DM on Instagram, Facebook and TikTok; public reply also on LinkedIn and YouTube	Flows (since September 2026): keyword replies with up to 3 fixed texts, on Instagram and TikTok. Free for a limited time, then a paid add-on	No verified public data	No verified public data
Comment moderation	Automatic moderation: hides, holds for review or deletes comments, with your approval to delete	The inbox can't hide or delete comments. On TikTok, Flows hides comments with banned words	No verified public data	No verified public data

Buffer suggests AI replies that learn your voice, 5 a week on its free plan. Hootsuite offers AI-assisted replies in its inbox and automates replies from its Professional plan ($199 USD a month). Metricool doesn’t document AI replies in its inbox, and Flows, its automation, uses up to 3 fixed texts. HeyMark replies with AI in your brand’s voice, with approval and handoff to a person (all as of September 2026).

Where the others win: Hootsuite if you need social listening or a suite for a large team; Buffer if you want the simplest option and to pay per channel; Metricool if your priority is analytics, a free plan or publishing to more networks.

How to get started

1. Connect your Instagram account and any others you use. HeyMark pulls in what you’ve published, and Mark learns your voice from it.
2. Add what the AI can’t guess to the brand profile: lead times, prices, policies.
3. Turn on AI replies and review the first ones in the inbox.
4. Set keyword rules for the fixed promises in your campaigns.