Sites built with MessagePack
Binary serialization format and JavaScript implementation used as a compact alternative to JSON.
9 sites
8 found by StackScope, 1 via launch platforms
- StackScope Wider Web 7
- StackScope Discovery (Indie) 1
- Hacker News 1
MessagePack has been detected on 9 launches since first appearing in July 2026. Most recent detection: Snapdrop, yesterday.
It's most commonly paired with Cloudflare DNS, Cloudflare, and HTTP/3.
Share of new sites using MessagePack
Each dot is one launch day. Line is the 7-day rolling average. Chart starts at first detection.
The shaded part of the chart is measured against a different set of sites. Until 8 July 2026 we only tracked launches from launch platforms; from that date we crawl the wider web as well. The share is a proportion of whatever we were tracking at the time, so it can step at that line without the technology itself changing. For a single continuous measure, switch to launch platforms.
Javascript Library leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
jQuery
|
14.67% | 35.43% |
| #2 | – |
React Router
|
6.45% | 15.57% |
| #3 | – |
Motion
|
6.12% | 14.77% |
| #4 | – |
TanStack Router
|
4.13% | 9.97% |
| #5 | – |
Swiper
|
3.77% | 9.10% |
| … | ||||
| #790 | ▼281 |
MessagePack
Current page
|
<0.01% | <0.01% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Javascript Library tool.Among August launches it ranked #872 in Javascript Library, down from #591 in July. All 1274 in Javascript Library →
Often used with
| Tool | Sites |
|---|---|
Cloudflare DNS
|
6 |
Cloudflare
|
6 |
| HTTP/3 | 6 |
unpkg
|
4 |
Google Fonts
|
3 |
Tools most often detected on the same sites as MessagePack.
Recent launches we can show
2 of the 9 sites using MessagePack are product launches we list individually. The other 7 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. How StackScope Discovery works
The StackScope API serves all 9 sites using MessagePack, filterable and exportable, from £15 a month.