How Serein launched on X
13K views, ranked 1875 of the 1981 launches we track. It was saved at well above the usual rate, which is the signal that matters more than reach for anything with a considered purchase behind it.
1:00
I just killed all browsers. Introducing Serein, with built-in Claude Code, Codex, and Grok agents that can browse the web. Each agent gets its own tabs and cookies, when they reach a password or payment page, they stop and hand the tab back to you. Serein works with modern
How it compares
A launch means nothing against no one. These are the launches it is actually comparable to, and where this one sits among them.
| Compared with | Launches | Median views | This one | Rank |
|---|---|---|---|---|
| Product release the same kind of announcement | 954 | 692K | 0.0x | 903 |
| 5K to 25K followers accounts of a similar size | 479 | 582K | 0.0x | 452 |
| Every launch all of them, for scale | 1981 | 688K | 0.0x | 1875 |
What this launch shows
Serein posted this from an account with 19K followers and reached about 68.1% of them. Accounts of that size usually reach 50.8 times their following.
This one did not get far past the people who already followed it. It ranks 452 of 479 launches from accounts that size. Against every launch in the directory it is below the median of 688K views, at rank 1875 of 1981.
Replies led. 29 of them, 22.5 per 10,000 views against a median of 2.3.
The post started a conversation, and the ranking model pays for conversation with reach in the hours after. Bookmarks came in at 36, reposts at 7.
The post opens with “I just killed all browsers”. It carries a 1:00 video against a directory median of 65 seconds.
Videos between 30 and 90 seconds have a median of 603K views in the directory. The copy runs 50 words, about the usual length for a launch post here, where the median is 41.
There is a link in the body, which costs a post some reach and buys it a place to send people. It went out on a Tuesday. Launches posted on a Tuesday have a median of 651K views in the directory, and Friday is the strongest day at 880K.
Attributing signups to a launch covers this: a save rate this high is the number to follow into the product. For the next one, read giving people something to reply to: the conversation is what carried this one.
X analytics explained is the guide for it: what each of these numbers means, with benchmarks by account size.
Questions about this launch
When did Serein launch?
Serein posted the launch on X on 13 October 2026.
How many views did the Serein launch post get?
12,869 views at the last read, ranked 1875 of the 1981 AI launches Doomers tracks, 1 times the account's following.
Who posted the Serein launch?
@ziwenxu_, which has 19K followers.
Planning something like this?
We run launches on X for AI companies, with creators who already hold the audience you want reaching.