postmatic for X: pricing, setup and how it works

What postmatic is

postmatic is a Chrome extension for X.com. Its home page frames it for founders building in public, executives building thought leadership and creators growing an audience. You tell it how you write and what you care about, and it comments on relevant posts in that voice.

It is an engagement tool that reads your X feed and writes replies in your voice. Its home page lists the benefits as visibility and audience growth from consistent commenting on relevant posts. Results depend on your niche, your prompt and the posts it picks, so judge it on the comments it writes rather than on follower counts. The settings cover the voice, the topics and the pace.

Pricing and plans as of October 2026

The home page lists three options. The free trial lasts 3 days with 5 auto-comments a day and all tone options. Pro Monthly is $9.99 a month with unlimited auto-comments, custom prompt rules and priority support. Pro Annual is $99 a year, which the page describes as saving about $20 against monthly.

The home page states that all plans include a 30-day money-back guarantee and that billing runs through Stripe. The Terms of Service say cancellation takes effect at the end of the billing period. Keep your purchase date.

Pro Monthly includes unlimited auto-comments, custom prompt rules and priority support, and the annual plan carries the same features. Twelve months at $9.99 add up to $119.88, so the $99 annual price saves $20.88, which matches the home page's "about $20" description.

How it runs on X

Setup is three moves on its home page: install the extension, set your voice and frequency, then let it run. The settings panel is the main place you work. The home page says the extension runs in your browser with your existing logged-in X session, with randomized delays between comments and natural scrolling. You set the frequency, the approved and blocked topics and blocked profiles. Approved topics get 3 times the priority in ranking.

The home page calls it auto-commenting that posts on your behalf, with the pace set by your cycle frequency. Rate each comment with thumbs up or down, and add blocked topics and blocked profiles to steer what it skips.

The privacy policy lists what it collects: your email address through Google OAuth, public tweet text sent to the Google Gemini API to generate replies, preferences and comment history stored in your browser, and subscription status. It names Google OAuth, Supabase, Google Gemini API, Stripe and Vercel as third-party services.

The Terms of Service put responsibility for content and account actions on the user, so read the first replies it writes before you raise the frequency.

AI features

The AI part is comment generation, which is separate from writing a post for your own timeline. You write a custom prompt that defines tone, expertise and positioning, and postmatic generates a reply for each post it picks. Thumbs up or down feeds back into later comments. Its example targets a startup founder, with a confident, direct voice and a goal of earning follows by being insightful.

Replies are short by nature, and the settings reflect that: a custom prompt, a topic list and a posting pace. postmatic's job is replies to other people's posts. Original posts and threads for your own timeline are the job Threadgehog does.

How to judge the free trial

The trial gives 5 auto-comments a day for 3 days, so up to 15 comments in total. That is a small sample, which makes it easy to read every one. Check three things: does each reply add something to the post it answers, does the tone match the custom prompt you wrote, and are the blocked topics and profiles respected.

Start with a short, specific prompt like the one on its home page: who you are, the voice you want, and the goal. Add two or three approved topics, a few blocked topics, and keep the cycle frequency slow while you test. Use thumbs up or down on every comment during the trial, because that feedback is how the replies are meant to move toward your style.

Pro Monthly is $9.99 a month, and the home page lists a 30-day money-back guarantee on all plans, so keep the date you start.

A worked example of the prompt: "I am a solo developer building an invoicing app. Direct, a little dry, no hashtags. The goal is to earn follows from other developers by adding one useful detail." Approved topics might be indie development and SaaS pricing, and blocked topics might be politics. Short and specific beats long, because every comment you rate afterward teaches it from that starting point.

Using it together with Threadgehog

Threadgehog handles the original posts and threads: it writes them in a voice learned from about ten example posts, you approve the ones you like, and it sends them to Buffer, Typefully, Publer, Metricool or Postiz. For your own posts, Threadgehog's Export only mode gives you the finished text to paste anywhere. The two tools do separate work: Threadgehog fills your own timeline, and postmatic engages with other people's posts. Threadgehog's "Posts that include your link" setting runs from 0% to 100% in steps of 5, so you decide how many of your own posts point to your product while postmatic builds visibility through replies.

Both ask you to describe a voice, so keep them aligned. A reply that sounds like a different person from your last post stands out on a profile page. Reuse the same tone notes in the postmatic custom prompt that your Threadgehog example posts show. See how to keep one voice on Threads and X and how to write in your brand voice. Threadgehog is on a waitlist now; join on the download page.

Questions

Sources

1. postmatic home page (checked 2026-10-17)
2. postmatic Terms of Service (checked 2026-10-17)
3. postmatic Privacy Policy (checked 2026-10-17)
4. Threadgehog overview (checked 2026-10-17)

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