Compare · Crowd amplification
Blowhorn vs Thunderclap
Thunderclap (thunderclap.it, 2012 to 2018) proved that a crowd lifting one message works. It closed on 15 Sep 2018. Blowhorn carries the idea forward with real people acting as themselves, at a human pace.
Which one fits you
If Thunderclap is the better fit, go use it. We mean that.
Choose Thunderclap if
- Thunderclap is closed, so it can't be the fit today
- If you loved it for causes and campaigns, enterprise advocacy suites are the nearest living option at scale
Choose Blowhorn if
- You want the Thunderclap feeling: many voices, one message
- You want it from real people's own profiles, not identical posts fired at the same minute
- You want replies and discussion, not just a reach number
Side by side
Thunderclap pricing as of Oct 2026: Closed 15 Sep 2018. In 2017 it had a free tier and paid tiers per campaign (source). Blowhorn: free during early access.
| Feature | Thunderclap |  Blowhorn |
|---|---|---|
| Status | Closed in 2018 | Live, free during early access |
| How it worked | Supporters pledged an account; one identical message posted from all of them at once | Every profile in your account amplifies your post: reposts, quotes, comments and replies, at a human pace |
| Where it acted | Thunderclap's cloud | Your Macs: your own signed-in Chrome for LinkedIn, X, Reddit and Hacker News; the platform's API for GitHub, Bluesky and Slack |
| Networks | Twitter, Facebook, Tumblr | LinkedIn, X, Reddit, Hacker News, GitHub, Bluesky, Slack. Instagram, TikTok, Facebook and YouTube coming soon |
| Bought engagement | None | None. Blowhorn sells no followers, likes or reposts |
Strong signal, not bought numbers
Blowhorn doesn't sell followers, likes or repost packages, and it never will. A like from someone paid to click is weak signal: it moves a number and nothing else. Strong signal is a reply, a question, a repost with a real take from someone who knows your work, a thread that turns into a discussion. Blowhorn exists to get your message in front of the people who would answer it, through the profiles of real people who chose to back you.
Thunderclap's lesson is that identical posts fired at the same minute look like a stampede, and platforms shut that down. Blowhorn's sound wave is different by design: people who chose to back you, acting as themselves, so the result is replies and discussion, not a wall of copies.
Questions
What happened to Thunderclap?
It closed on 15 Sep 2018. The domain thunderclap.com is now an unrelated business that sells followers and likes; see our separate comparison.
Is Blowhorn a Thunderclap alternative?
In spirit, yes: one message, many voices. In method, no: real people acting as themselves, at a human pace, not identical simultaneous posts.
One message out, many ears in
If that sounds like what you've been missing, give Blowhorn a try. It's free during early access.