I built it to market my products. It became the product.
I'm Mithun Kumar, a product/GTM engineer turned founder. Commentify started as the tool I built to get my own products in front of the right people on LinkedIn, without spending my whole day in the comments.
Founder-led · Building Commentify since July 2024
Product/GTM engineer turned founder, based in Bengaluru. Designs, builds and supports Commentify.
I could always build. Distribution was the hard part.
I started early. At 19 I was selling pre-built sales funnels to digital agencies. Since then I've worked as a product/GTM engineer at early-stage startups, and I've kept building products of my own on the side.
In 2023 I built Cold Pitch, a tool that writes a personalized cold email for every prospect. Shipping it was the easy part. Getting it in front of the people who needed it was not. Every product I'd built taught me the same lesson: a profitable business needs distribution or capital. I needed distribution.
The comment section became my distribution.
The people I wanted to reach, founders, sales teams and agency owners, were on LinkedIn every day. What worked for me was the comment section. A useful reply under the right post puts your name and headline in front of everyone reading it, and some of them click through to see who you are.
So I did it by hand, about two hours a day: finding posts worth replying to and writing comments that added something. It worked, but it was a second job, and on the days I skipped it, the visibility stopped.
So I automated it. Then the tool became the product.
I wrote a tool to do the part I kept repeating. It watched the topics and people I cared about, picked the posts where a reply would be seen, and drafted comments that sounded like me, for me to approve.
It turned out to be more useful than the product it was marketing. In July 2024 I made it the product. That's Commentify, and Jeni is the agent inside it. Today she comments on LinkedIn and X, and writes LinkedIn posts, for founders, consultants and sales teams.
It still grows the way it started: on LinkedIn.
I built Commentify to get my products noticed on LinkedIn, and LinkedIn is still where Commentify itself gets noticed. It sends us more visitors than every other source combined. Here's the report, straight from our Google Analytics.
From June 30 to September 27, 2026, linkedin.com sent 24,183 of our 41,982 sessions, more than every other source combined. Google, our biggest search source, sent 12.8%.
Two years in, by the numbers.
Commentify production data, July 2024 to September 28, 2026. Profile-view figures cover the 55 accounts that ran for at least 90 days with 300+ comments in that window, comparing LinkedIn's 90-day profile viewers on day 90 with day 0. Results vary: the middle half landed between 1.4x and 10.4x.
What it looks like on a founder's dashboard
Aggregates are one thing. Here is 90 days of follower growth from four founders' own LinkedIn analytics.
Screenshots from LinkedIn's follower analytics, shared by founders who use Commentify. We keep them anonymous. The percentage is LinkedIn's own: total followers compared with 90 days earlier. Their own posts played a part too, so read these as examples, not a promise. Click any screenshot to see it full size.
What I won't compromise on.
Comments have to add something
Jeni writes a contextual reply in your voice every time. No templates, no "Great post!". If a comment isn't worth reading, it shouldn't be posted.
Your account comes first
Comments go out at human intervals within LinkedIn's and X's limits, and Jeni skips political, tragic and controversial posts.
You stay in control
Review every comment until you trust the quality, then switch to auto-approve. You can switch back any time.
Show the receipts
We publish real numbers from our own data, and we tell you where results vary.
A founder-led company.
Commentify is founder-led. I design and build the product, and I read the feedback that comes in. Support calls land on my calendar, so when you book one, you're talking to the person who built the thing you're using.
Have an idea, a bug, or a question before you buy? Write to support@commentify.co or book a call.
What's live today.
- ✓LinkedIn commenting: live, in Personal Branding and Sales modes.
- ✓X (Twitter) commenting: live.
- ✓LinkedIn posting: live. A weekly content calendar in your voice, with AI-generated images.
- ✓X posting and Reddit commenting: coming soon.
If you're building something good and the right people haven't noticed yet, that's the exact problem Commentify was built for. Try it free for 5 days, or book a call and I'll help you set it up.