dmrabbit and InstantDM are the two cheapest serious options for Instagram comment-to-DM automation, and they are close enough that the choice comes down to two things: whether you want AI-written replies, and how much you want to pay for unlimited volume.

Both run on official Meta API access. Neither asks for your password. Both charge a flat monthly rate rather than billing by contact count, which is the thing that makes ManyChat unpredictable once a post performs. Figures below were checked in September 2026.

The short comparison

Price. dmrabbit Starter is $5.90 a month or $59 a year. InstantDM Legend Pro is $9.99 a month, with a Trendsetter tier at $24.99.

Free plans. Both have one that does not expire. dmrabbit gives 500 comment replies plus 500 messages a month. InstantDM gives 500 automations a month. Different units, roughly the same size.

Channels. dmrabbit is Instagram only. InstantDM also covers Facebook Messenger.

AI. InstantDM includes AI-written replies on its paid tier. dmrabbit does not. Rules match a keyword and send the message you wrote.

Triggers. Both handle post comments, DMs and story replies. dmrabbit also triggers on story mentions.

Follow gate. Both have one built in.

Bio page. dmrabbit includes one at dmrabbit.com/yourhandle on every plan, free tier included. InstantDM does not bundle one.

Accounts. One Instagram account on either dmrabbit plan. That is a fixed product decision, not a tier.

Where InstantDM is the better buy

You want AI replies. This is the real dividing line. InstantDM can hold a multi-turn conversation and answer things you did not anticipate. dmrabbit sends what you wrote, every time. If your DMs need to handle open-ended questions, InstantDM does something dmrabbit does not do at all.

You need Facebook Messenger. dmrabbit will never cover it.

You want one tool across both Meta surfaces rather than two subscriptions.

Where dmrabbit is the better buy

Unlimited costs less. $5.90 against $9.99, and dmrabbit's paid plan removes the caps rather than raising them. No monthly automation count to watch.

The follow gate is honest about how Instagram works. Instagram only lets an app read whether someone follows you after that person has messaged your account. dmrabbit's comment gate therefore sends a private reply with an "I'm following" button, checks the status when they tap it, and asks again if they have not followed. It is a real handshake rather than a check that cannot legally happen.

A bio page is included. Links and short articles at dmrabbit.com/yourhandle, on the free plan too.

Less to configure. One channel, four trigger types, a keyword and a message. If Instagram is the whole job, there is nothing else to learn.

What neither of them does

Worth saying plainly, because comparison pages usually skip it.

Neither automates Instagram Live comments. That needs a permission Instagram grants sparingly, and neither app holds it.

dmrabbit's automated DMs are text and links only. If you need to deliver a PDF or a video inside the message itself rather than as a link, dmrabbit cannot do it.

Which to pick

Choose InstantDM if you want AI-written replies, or you need Facebook Messenger alongside Instagram.

Choose dmrabbit if Instagram is your only channel, your replies are predictable enough to write once, and you want unlimited sending at the lowest price. The bundled bio page is a genuine extra rather than a listed feature nobody uses.

Both have free plans that do not expire, so the honest advice is to run the same automation on both for a week and keep the one you prefer using.

FAQ

Is dmrabbit cheaper than InstantDM? Yes. $5.90 a month against $9.99. dmrabbit's paid plan is unlimited; InstantDM's includes AI replies that dmrabbit does not offer.

Does InstantDM have a free plan? Yes, 500 automations a month, and it does not expire. dmrabbit's free plan is 500 comment replies plus 500 messages a month.

Do either of them need a Facebook Page? dmrabbit connects straight to a Business or Creator Instagram account without one.

Can I use both? Only one automation tool should act on an account at a time, or two tools will answer the same comment. Both free plans are open-ended, so test them on separate weeks rather than in parallel.

What about ManyChat? Different shape entirely: multi-channel and priced by contact count. See dmrabbit vs ManyChat, or the wider comparison of Instagram automation tools.

Try the free plan on your own account: start free with dmrabbit, no card required.