OpenCEP on new websites 
Free Brazilian postal code lookup API used to autocomplete addresses in checkout forms.
Found via: StackScope Discovery (Indie) 1 · StackScope Wider Web 9
OpenCEP appeared on 3 new sites in the last 30 days.
These figures cover websites that went live since April 2026, not the web as a whole.
Share of new sites using OpenCEP
Each dot is one launch day. Line is the 7-day rolling average. Chart starts at first detection.
The shaded area was measured against a different set of sites, so the line can step there without OpenCEP itself changing.
Coverage details
Amber: 8 July to 10 September 2026, before we improved our infrastructure to 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 10 September. We record each site as it was when we found it.
The share is a proportion of whatever we were tracking at the time. For a single continuous measure, switch to launch platforms.
Domain endings using OpenCEP
10 sites, all time
- .br 50.0%
- .com 50.0%
Forms leaders
| Tool | % of sitesall time | % of categoryall time | ||
|---|---|---|---|---|
| #1 | ▼1 |
Web3Forms
|
0.1% | 13.2% |
| #2 | ▼1 |
Formspree
|
0.1% | 12.8% |
| #3 | – |
Tally
|
<0.1% | 10.0% |
| #4 | ▲2 | CNYandex Forms | <0.1% | 8.8% |
| #5 | – | Google Forms | <0.1% | 6.9% |
| … | ||||
| #111 | ▼41 | OpenCEP Current page | <0.1% | <0.1% |
Percentages show all-time adoption across the new sites we track: the share of all of them, and of the sites using any Forms tool.Among September launches it ranked #137 in Forms, down from #96 in August. All 532 in Forms →
Recent launches using OpenCEP
1 of the 10 sites using OpenCEP are product launches we list individually. The other 9 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. They are included in the StackScope API and in Stackdar alerts. How StackScope Discovery works
The StackScope API serves all 10 sites using OpenCEP, filterable and exportable, from £15 a month.