Is there a free way to auto reply to Instagram comments?

Yes, a free workspace can run comment automations on Instagram, and it is a plan rather than a trial, so it does not stop after a week.

What you get and what the limit is:

• One channel. For most people starting out that is Instagram, which is the one that matters for comments.
• Comment triggers, keyword matching, private replies and public replies. The core comment to DM loop is not a paid feature.
• A capped number of flow runs. When a post does unusually well you will feel this before you feel anything else.

The one visible difference on a free workspace: automated direct messages carry a short attribution line. Three details that are worth knowing precisely, because people assume worse:

• It goes on the first DM in a run, not on every message.
• It applies to Instagram and Messenger DMs only. Your public comment replies do not carry it, because that is your own post.
• If adding the line would push the message past the character limit, the message goes out without it rather than truncating what you wrote.

The honest advice for one person with a small shop: start free, build the one automation that answers your most repeated question, and only look at a plan when the run cap rather than the attribution line is what is stopping you. The pricing page has the current limits.