Undertow on new websites
- Sites using Undertow
- 4
- since Aug 2026
- Last 30 days
- 0.0%
-
of new sites, to Oct 19
no change on the 30 days before - Last 7 days
- 0.0%
- of new sites, 7-day average
no change on the week before
| First seen | Aug 27, 2026 |
|---|---|
| Last seen | Sep 23, 2026 |
What we found
- Undertow appeared on 1 new site in the last 30 days.[1]
Share of new sites using Undertow
The line is the 7-day average share of new sites that use Undertow, since 10 September.
What Undertow runs on
Java
Server on new sites
| # | Movement | Tool | Share of category | Bar | |
|---|---|---|---|---|---|
| 1 | – |
nginx
|
37.4% | ||
| 2 | – |
LiteSpeed Web Server
|
25.9% | ||
| 3 | – |
Apache
|
18.3% | ||
| 4 | – |
Caddy
|
11.7% | ||
| 5 | – |
OpenResty
|
3.5% | ||
| … | |||||
| 76 | ▲18 | Undertow | <0.1% | ||
All-time shares across the new sites we track: of all of them, and of the sites using any Server tool. Among September launches it ranked #54 in Server, up from #72 in August. All 143 in Server
4 sites across the wider web use Undertow
None of them is a product launch we list individually, so there is nothing to show here. They still count towards the figures above. How we find new sites
Watches, exports and the API give you all 4 sites using Undertow, from £15 a month.
Notes
- These figures cover websites that went live since April 2026, not the web as a whole.
How this page is made
FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards Undertow when we detect Undertow on it at that look.
Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies ยท How we find new sites