Tools that auto-reply to social media comments (2026)

TL;DR: quick picks

• Replies that must sound like you (consultants, coaches, founders): PersonaXpand. Voice-trained AI for comments, DMs and mentions with one-tap approval, $12 a month flat. Disclosure: this one is ours.
• AI replies on ad comments (brands running paid campaigns): FeedGuardians or ReplyZen. AI-written answers plus spam hiding on Facebook and Instagram ads; FeedGuardians covers TikTok ads as well.
• Comment-to-DM funnels at volume: ManyChat. Keyword flows are exactly the right tool for “comment LINK and I'll send it”.
• Moderating busy pages and ad comments: NapoleonCat. Rule-based auto-moderation, including Facebook and Instagram ads, on its Expert plan.
• A support team sharing one inbox: respond.io or SleekFlow. Built for teams of agents, not individuals.
• Zero budget: Meta's native saved replies. Templates, not intelligence, and genuinely free.

How we compared them

Every price in this guide was re-checked on each vendor's official pricing page in September 2026 and is the entry paid tier unless stated otherwise; where a vendor only publishes annual-billed rates, we say so instead of guessing, and where a vendor publishes no prices at all, we quote none. Platform coverage comes from each vendor's own pages, not from third-party lists, which in this field often get it wrong. We build PersonaXpand, so it is listed first and marked as ours, and where a rival is the better fit for a job we say so in that tool's section. We did not run paid trials of every rival for this update, and we do not claim to have.

The three kinds of "auto-reply", and why it matters

• Keyword flows: if a comment contains X, send Y. Predictable, fast, and obviously robotic the third time anyone sees it.
• Moderation rules and canned templates: saved responses fired by hand, or rules that hide, flag or answer matched comments with fixed text. Half automation: useful as a net, but the words are frozen.
• AI-written replies: reads the comment and composes an answer instead of firing fixed text. Two flavours: tools built for brands answering customers under ads, which pair replies with spam hiding (FeedGuardians, ReplyZen), and voice-trained AI that writes the way one particular person would, autonomously or held for approval (PersonaXpand).

At-a-glance comparison (verified September 2026)

Entry paid tier from each vendor's official pricing page, September 2026. Annual means billed annually. FeedGuardians prices in euros. ReplyZen publishes volume-based pricing with no figures, so none is quoted. ManyChat figures are its March 2026 pricing model and may vary by region. SleekFlow's page localizes prices by region; the AED figure is what it shows in the UAE, so its dollar figure is deliberately not quoted.

1. PersonaXpand: voice-trained AI replies (ours)

Disclosure first: PersonaXpand is our product, and automatic replies are its core rather than a bolt-on. PersonaXpand is an AI social media manager for personal brands: it writes posts in your own trained voice for all seven networks and auto-replies to comments, DMs and mentions, on one flat plan. The reply engine answers comments and DMs on Instagram, Facebook, X, YouTube and Threads: approval mode sends every reply to your inbox for one-tap approve or edit, autonomous mode handles routine ones alone, and anything sensitive gets flagged to you instead of guessed at. From $12 a month on the base plan.

Honest limits: it replies as you, not as a support department, so there is no ticket routing and no team inbox. Auto-reply covers Instagram, Facebook, X, YouTube and Threads; it does not cover LinkedIn or TikTok. The free plan is small on purpose: 14 days of everything, then 7 posts and 5 automations a month for as long as you keep the account.

2. FeedGuardians: AI replies and moderation for ad-heavy brands

FeedGuardians is built for brands whose busiest comment sections sit under ads. Every plan includes AI comment moderation that hides spam and hate, plus AI-written answers to genuine comments. It covers Instagram, Facebook, TikTok and Bluesky, organic posts as well as Meta and TikTok ad campaigns, and its own pricing page says plainly that it does not cover X, YouTube or LinkedIn.

Starter is €41 a month billed annually for up to 5,000 interactions a month, with unlimited channels in one workspace; Growth is €83 for 12,000. Strength: one of very few tools writing answers on ad comments, TikTok ads included. Limit: it is metered and priced around brand ad volume, and automatic DMs are not on its plan list.

3. ReplyZen: AI replies, DMs and moderation in one pass

ReplyZen reads each comment on your ads and posts, answers publicly, can send the commenter a private message, and hides or deletes spam in the same pass. It covers Facebook and Instagram, with TikTok in beta. Pricing is volume-based on comment count and no figures are published; the 14-day trial includes 500 AI replies and 500 moderations. Strength: public reply, DM and moderation together. Limit: no published price means a sales conversation before you know the bill, and it is shaped for businesses answering customers rather than a person answering their own audience.

4. ManyChat: keyword flows for funnels at scale

ManyChat is the leader in flow-based automation: keyword-triggered sequences (“comment LINK and I'll DM it to you”), lead capture, drip sequences. It's excellent for creators running comment-to-DM funnels at volume. It is not trying to sound like you: flows are scripts, and audiences know it. Different job than voice replies; some creators run both.

Pricing changed in March 2026: the free plan now covers 25 active contacts a month, and the Essential tier is $17 a month, or $14 billed annually, for 250 contacts, with overage billed per contact ($0.10 each on monthly billing). Channels span Instagram, TikTok, Messenger and Telegram; WhatsApp arrives at Pro ($39, or $29 annual). The limit for a solo brand is the meter: one modestly viral reel can push you into overage.

5. ReplyRush: the cheapest Meta comment-to-DM automation

ReplyRush automates Instagram and Facebook comment-to-DM at creator prices: a free plan covers 1,500 DMs a month on one Instagram and one Facebook account but excludes comment auto-reply; the $10 Lite plan adds it with 7,500 DMs, and ReplyRush branding stays on messages until the $25 Boost tier. Two platforms only, and only monthly billing is published. Its strength is real automation at the lowest paid price in this field alongside ours; the trade is trigger-based sending rather than composed replies, and nothing outside Meta.

6. Chatfuel: Meta plus WhatsApp flows

Chatfuel runs flows across Instagram, Facebook and WhatsApp, and is an official Meta partner and WhatsApp Business Solution Provider. Its pricing page no longer lists a free plan: every plan starts with a free trial, Business is $20 a month or $18 billed yearly with $20 of AI credits a month included, and Agency S is $90. Strength: WhatsApp Business API access at a low entry price. Limit: AI use is metered in credits, and coverage stays inside the Meta ecosystem.

7. MyComments.io: ad comment moderation for Meta

MyComments.io keeps Facebook and Instagram comment sections clean around the clock: it hides spam, hate speech and competitors' links on posts and ads, with unlimited Pages and team members on every plan. Starter is $29.99 a month for 1,000 comments. It does not write AI answers; its Pro plan ($149.99) adds keyword-triggered DMs that deliver a link when someone comments words like “price”, with a public reply on the comment. Strength: the lowest published entry price for dedicated ad-comment moderation here. Limit: Meta only, and its replies are triggers, not composed answers.

8. NapoleonCat: the moderation net

NapoleonCat auto-moderates at rule level: auto-replies, auto-hide and sentiment rules across Facebook posts and ads, Instagram posts, ads and DMs, Messenger, TikTok posts and ads, and YouTube comments; its feature page also claims LinkedIn organic post comments, which few tools in this field offer. The catch is packaging: auto-moderation sits on the Expert plan at $119 a month billed annually ($139 monthly), sized for five profiles and two users. Ad-comment moderation is no longer unique to it, since MyComments.io and FeedGuardians also moderate ads for less; its edge is breadth, adding YouTube and LinkedIn in one suite, and you are buying a team-sized suite to get it.

9. Agorapulse: inbox rules for small teams

Agorapulse covers eleven networks with rule-based inbox automation from its Standard tier, $79 per user a month billed annually, $99 monthly. Read the fence lines: below the top tiers you get one moderation rule per profile with one trigger condition, and saved replies only unlock on the $149 Advanced tier. Widest network list in this field; the automation you would actually want is fenced into the expensive seats.

10. respond.io: a support desk, honestly

respond.io Starter is $79 a month including five user seats, with WhatsApp, TikTok, Instagram, Facebook, email, SMS and calls in one team inbox. It is excellent at what it is: conversation management for support teams. For one person answering their own audience it is the wrong shape: you pay for five seats and a routing architecture you will never use.

11. SleekFlow: omnichannel for sales teams

SleekFlow spans the widest chat list here, WhatsApp through WeChat and Viber. Its pricing page localizes by region; in the UAE the Pro tier lists at AED 399 a month, with 20% off billed yearly, ten users and 500 monthly active contacts to start, so treat any dollar figure you see on third-party lists with suspicion. Built and priced for sales teams, not solo brands.

12. Hootsuite: automation on team tiers

Hootsuite's paid plans start at $99 on Standard, but inbox reply automation starts on Professional at $199; auto-assignment and routing arrive at Advanced ($399). Monthly-billed rates are not published on its plans page. For organizations triaging volume across agents it's the mature choice; for one person it's the wrong shape and the wrong bill.

13. The free layer: platform-native tools

Meta's own tools include saved replies and simple keyword responses for Facebook Pages and Instagram professional accounts, free. They're templates, not intelligence, but for an FAQ-shaped comment section (“price?”, “location?”) they cover the basics at zero cost, and they're the right first stop before paying anyone.

Five questions to ask before you pick

• 1. Do replies need to sound like a person, or is a script acceptable where they will be read?
• 2. Comments, DMs, or both, and on which networks? Check the tool's actual coverage against where your audience is; the table above is a start.
• 3. Is there an approval mode? Tools that only offer full-auto deserve suspicion.
• 4. What happens on a sensitive comment: flagged to you, or answered by guesswork?
• 5. What loop protection exists: self-skip, per-sender caps, platform cool-offs? Runaway repliers are how accounts get restricted.

Is auto-replying to comments safe?

Working through official platform APIs is the safe path: rate limits respected, no passwords shared. Before connecting any tool, check that it sends you to the network's own login rather than asking for your password. What gets accounts restricted is the other kind of automation, credential-scraping tools and identical spam replies at volume. The full treatment, including what the platforms actually enforce: is Instagram automation safe?