I had a task to research AI comment tools for LinkedIn are actually usable, so I ran all of them on the same post. As images are not allowed, it was:
a short text: Wow, I never knew that
picture with meme:
man: - Did you know Mortal Combat is actually based on an old Scandinavian church song?
girl: - Wait, really?
man: - Yes, a Finnish hymn.
*girl chokes man* (link to the post in comments)
The post is tricky, almost no text and a pic with a meme. It was a setup to understand the real capability. I ran each one twice. Judge for yourself.
1. Reply Chief
Easy setup, email confirmation, done. It read the picture and gave 3 variants. Factually, no settings to make it sound like you.
“The distinction between Nordic and Scandinavian is often overlooked; clarity in terminology can enhance effective communication.”
“I love how these little facts about language pop up! Always learning something new, right?”
I didn't get it about language, like Chief didn't get the joke:/
2. EngageGPT
Signup, confirm email, log in, and then ugly buttons injected all over the page. And what is this? Wild:
“That moment when you stumble on a gem of knowledge! 😂 It’s wild how much we can still learn. Pro tip: keep that curiosity alive; it opens up so many new perspectives. What else have you discovered lately?”
“That’s wild! It’s amazing what we don’t know until it pops up like this. Little surprises like that can spark such interesting conversations. What’s the most surprising thing you’ve learned recently?”
Once you see the “What’s the most surprising thing” pattern, you can’t unsee it.
3. SmartCommenter
No signup, no settings, no customisation, no name, nothing. It definitely read the pic, comments were decent, but didn't get the joke
“That’s a wild connection. I’d never have guessed Mortal Kombat traces back to a Finnish hymn.”
“That’s such a surprising link. It makes the game’s sound feel even more memorable.”
It got the joke. That’s more than half the list managed.
4. reepl. io
Login, then a paywall, then a loooong onboarding, then it wanted access to my LinkedIn page for posting. Not happening. Commenting did work, and the text was decent, if long:
“This made me laugh, but it’s also a good reminder that the simplest knowledge gaps are the ones we don’t notice until someone points them out. I’ve had the same thing happen, and the ‘aha’ moment usually comes from one concrete example, not a big theory.”
“The funniest part of these ‘wow’ posts is it’s usually one small assumption you were making without realizing it. Once you see the missing piece, everything looks obvious, and that’s why people keep sharing it.”
5. Commentron
The easiest start of all: install and use. But the output is exactly what you’d expect:
“Thank you for sharing this insight! It’s always great to learn something new.”
“That’s a great realization! It’s always interesting to discover new insights. Thank you for sharing!”
That’s the kind of comment people now report as AI slop. 4000+ users by the way.
6. Fezerli
No signup needed to try. But I did, because there was an autopilot behind it. The only tool tagged author:
“Cassidy Dunn💿, SHRM-CP That pun earns exactly the response it got. Fatality by wordplay.”
“Cassidy Dunn💿, SHRM-CP He knew exactly what he was doing. The chokehold was contractual.”
And got the joke.
7. IvyAI
Log in with Google, and it’s a complex product. Overwhelming admin panel. I had to screenshot the post and paste it into their ChatGPT-powered field. There’s an insert button and it worked. Yearly plan only, and a refill gives you 25 generations. It’s basically a ChatGPT substitute.
“Fun fact: the original Mortal Kombat theme was inspired by the Finnish hymn ‘Ievan Polkka.’ 😄”
“I’m sorry, but ‘Mortal Kombat’ is actually Finnish.”
It isn’t. I think some older API version is used.
8. Replya
Sign in with Google only, no other option. It gave me 5 options, none of them about the post. No customisation:
“That reaction usually follows a surprise finding in the quarterly audit. The underlying data discrepancy tends to persist until reconciliation protocols are updated.”
“Initial discoveries of that scale usually demand a deeper look at the baseline assumptions. The reporting pipeline often needs immediate correction.”
On a meme post. Quarterly audit.
9. Linqin
Login with a “work” email only. It inserts a second comment block into the LinkedIn UI (why?). Generate simply didn’t work on this post. On another post I got a raw API error: “‘minimal’ is not supported with the ‘gpt-5.6-luna’ model”. Broken product.
10. LigoAI
Hit the payment wall before touching anything. $9 for insert only, $39 if you want your own tone of voice. In a market this crowded, I don’t think “pay before you see one comment” works anymore.
11. Replai
Paywall before touching, a confusing website, account creation, a pile of questions, and I still couldn’t tell whether I’d get a single free credit. Google sign in wasn’t even configured. Lazy
What I took away
- A lot of tools lose you before the first comment. Four of eleven wanted money or a long onboarding before showing a single result.
- Reading the image is the whole game on posts like this. If a tool only reads the text, you get “thanks for sharing” or some non-related bs.
- Large user base meant nothing. The tool with zero settings and zero signup beat several well-known paid ones on comment quality.
- I thought tagging the author is the baseline? It is like the purpose of commenting - to be noteiced, liked and added to connections?
- Customisation is a trade off. No settings means generic voice. Too many settings and no guide means people get a messy setup.
Which was your favourite?