Sites using Altcha
Open-source proof-of-work CAPTCHA alternative; uses a TXT DNS record for domain verification
Get told when a new site ships with Altcha.
Stackdar watches every launch we detect and sends you the ones using Altcha, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts work1,081 sites
1,072 found by StackScope, 9 via launch platforms
- StackScope Wider Web 1,012
- StackScope Discovery (Indie) 60
- Product Hunt 5
- Hacker News 2
- PeerPush 2
Altcha has been detected on 1,081 launches we've crawled. The 7-day rolling share is 0.1%, roughly steady week on week. Most recent detection: Yayu · 把 OpenClaw 变成你的团队, today.
It's most commonly paired with Svelte, Tailwind CSS, and HTTP/3. By product type, the launches using it are most often Health (33%), E-commerce (12%), and Finance (11%). By domain ending, launches using it are 2.9 times as likely as the average launch to live on a .online domain.
What kind of products ship with Altcha
281 launches
Domain endings using Altcha
1,081 sites
- .au 37.84%
- .com 25.07%
- .online 9.34%
- .ch 4.72%
- .de 2.41%
- .uk 2.31%
- .cz 2.22%
- .xyz 2.04%
- .site 1.76%
- .store 1.57%
- .org 1.39%
- .app 0.93%
- .tech 0.93%
- .net 0.74%
- .sk 0.74%
Share of new sites using Altcha
Each dot is one launch day. Line is the 7-day rolling average; weekly averages before June 2026. 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.
How StackScope detects technologies
⋮ Jul 1, 2026: Adoption figures now count launches from launch platforms. Use the source view to include StackScope Discovery.
Security leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – | HSTS | 47.24% | 91.15% |
| #2 | – |
Cloudflare Bot Management
|
11.17% | 21.55% |
| #3 | – |
Google reCAPTCHA
|
1.83% | 3.52% |
| #4 | – |
DDoS-Guard
|
0.09% | 0.18% |
| #5 | ▲1 |
Anubis
|
0.07% | 0.13% |
| … | ||||
| #9 | – |
Altcha
Current page
|
0.04% | 0.08% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Security tool.Altcha is typically used alongside HSTS rather than instead of it. All 247 in Security →
Often used with
| Tool | Launches |
|---|---|
Svelte
|
8 |
Tailwind CSS
|
7 |
| HTTP/3 | 5 |
Google Search Console
|
4 |
nginx
|
4 |
Tools most often detected on the same launches as Altcha.
Recent launches we can show
69 of the 1,081 sites using Altcha are product launches we list individually. The other 1,012 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
Protectoras Online · Una web gratuita para tu protectora
SKOLARADAR — Logiciel de gestion scolaire pour l'Afrique de l'Ouest
Games
Hourglass Literacy - Writing Assessment tool
Education
RandoOS
Social
Markdown documentation portals for clients | Knowledge
Productivity
PactaPay
Finance
Pyment — studio de jeu rétro
Games
jrnyapp.com.au
Health
CBDC Dataset — Purpose, Privacy and Institutional Design
Turn your catalog into a searchable, filterable product database without replacing your website
Hitta rätt tullkod (varukod) för din vara · tullkoder.se
Showing the most recent 12 of 69.
The StackScope API serves all 1,081 sites using Altcha, filterable and exportable, from £15 a month.