Sites using CAL.pl Email 
Mail hosting from CAL.pl, a Polish hosting and domain provider.
Get told when a new site ships with CAL.pl Email.
27 new sites with CAL.pl Email first seen in the last 30 days.
Stackdar watches every launch we detect and sends you the ones using CAL.pl Email, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts workFound via: StackScope Discovery (Indie) 8 · StackScope Wider Web 42
CAL.pl Email has been detected on 50 launches we've crawled, with 17 of those in October 2026 (0.0% of the month's launches so far). The 7-day rolling share is 0.0%, roughly steady week on week. Most recent detection: System rozwoju i pomiaru kompetencji dla firm | Youniversity, 2 days ago.
It's most commonly paired with CAL.pl, LiteSpeed Web Server, and HTTP/3. By product type, the launches using it are most often Social (27%), Content (18%), and Finance (18%).
What kind of products ship with CAL.pl Email
11 launches
Domain endings using CAL.pl Email
50 sites
- .pl 40.00%
- .com 36.00%
- .app 4.00%
- .eu 4.00%
- .art 2.00%
- .be 2.00%
Country
26 of 50 sites, where we are semi-confident of the country.
-
Poland
100.00%
Share of new sites using CAL.pl Email
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.
Amber: on 10 September 2026 we improved our infrastructure so we can index new sites much sooner, often on the day they go live. Sites found that early often haven't finished setting up, so anything usually added after launch reads lower from that date. We record each site as it was when we found it.
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.
Email Hosting leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
Google Workspace
|
5.83% | 20.26% |
| #2 | – |
Hostinger Email
|
4.87% | 16.95% |
| #3 | – |
GoDaddy Email
|
2.18% | 7.58% |
| #4 | ▼1 |
Microsoft 365
|
1.92% | 6.68% |
| #5 | ▲2 |
IONOS Email
|
1.84% | 6.41% |
| … | ||||
| #478 | ▲238 |
CAL.pl Email
Current page
|
<0.01% | <0.01% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Email Hosting tool.Among September launches it ranked #414 in Email Hosting, up from #652 in August. All 4623 in Email Hosting →
Often used with
| Tool | Sites |
|---|---|
CAL.pl
|
49 |
LiteSpeed Web Server
|
43 |
| HTTP/3 | 42 |
Bootstrap
|
18 |
jsDelivr
|
17 |
Tools most often detected on the same sites as CAL.pl Email.
Recent launches we can show
8 of the 50 sites using CAL.pl Email are product launches we list individually. The other 42 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
confidential chat without an account
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The StackScope API serves all 50 sites using CAL.pl Email, filterable and exportable, from £15 a month.