AI reply tools for X, LinkedIn and Reddit: an honest roundup

Read this first

This roundup is written by the developer of ReplyKit, one of the tools on the list, so read it with that in mind. Facts about the other tools come from their own public pages and store listings as of October 2026. Prices are left out on purpose: they change often, so check each vendor's site. If something here is out of date, email contact@replykit.eu and it gets fixed.

How to choose

Before comparing features, answer four questions. They rule out most of the list.

• Do you want a reply tool or a suite? Suites schedule posts, track analytics and keep lead lists. Reply tools do one job in the reply box.
• Who presses Post? Some tools post for you. Others only draft. On every platform, automated posting is what gets accounts restricted.
• Bring your own API key, or not? Key-based tools are cheap and transparent, but you set up and pay a model provider yourself.
• Which platforms? Most tools cover only X, or only LinkedIn. Few cover Reddit.

Reply tools for X

• ReplyKit. Chrome extension for X, LinkedIn and Reddit. Three drafts per click with different angles, Opportunity Radar marks the X posts worth answering, optional voice learning from your own posts. Claude Sonnet on every plan, no API key, free daily replies. Never posts for you.
• MagicReply. Was a paid Chrome extension with a reply button in X's composer. Its website stopped loading in October 2026, so it may be discontinued; check the publisher of any listing that uses its name.
• Replix. Chrome extension for X that drafts three replies under a post, with many tones and a choice of models. Free daily replies with paid tiers; places the draft in the reply box for you to send.
• Zuiti. Open-source extension for X where you bring your own API key (Gemini, OpenAI, Claude or DeepSeek) and pick from eight reply styles. You copy the reply and post it yourself.

X growth suites

• Tweet Hunter. Paid suite: AI writing from a library of viral posts, scheduling, analytics and a CRM.
• Hypefury. Paid scheduling suite: a post queue, evergreen reposting and auto-plugs. Replies are a side feature.

If most of your growth comes from original posts, a suite makes sense. If it comes from replies, a reply tool does that one job better, and many people use one of each.

LinkedIn comment tools

• ReplyKit. The same extension drafts comments under LinkedIn's own comment box, in a LinkedIn register tuned separately from X.
• Taplio. Paid LinkedIn growth suite: post writing, scheduling, analytics, a lead database and an Engage view for finding posts to comment on.
• CommentCraft. Chrome extension that adds a button to LinkedIn's comment box and drafts several comment styles (insightful, question, counterpoint and more). Never posts for you. Its listings differ on whether you bring your own Gemini key, so check the one you install.

Reddit reply tools

• ReplyKit. Drafts under Reddit's own reply box in a plain Reddit voice, reading the post and the comments above. Never posts for you.
• Redimates. Reddit-only Chrome extension: thread summaries, notes that decode slang in comments, and AI replies that read the subreddit's rules. A weekly free allowance, more on Pro.
• ReplyGuy. A marketing tool rather than a writing tool: it monitors Reddit and X for keywords and writes replies that mention your product, which it can post.

The test that matters

Feature tables only go so far. Install two candidates, reply to ten real posts with each, and keep the one whose drafts you edit least. Whatever you pick, read every draft before it goes out. A reply with your name on it is yours, whoever wrote the first version.

Read next

• Side-by-side comparisons
• ReplyKit vs MagicReply
• ReplyKit vs Replix
• ReplyKit vs Zuiti