Cap
Cap is an open-source, self-hosted 
reCAPTCHA alternative that verifies visitors without visual puzzles, tracking, or third-party services.
It uses a two-layer verification model that combines proof-of-work challenges accelerated with 
WebAssembly and Web Workers, including SHA-256 hashing and optional GPU-resistant time-locks.
It uses Redis/Valkey for storage and can be deployed with 
Docker.
According to our data, Cap ranks 12th among the captcha services we track.
It has 0.01% of the captcha market share and is detected on 0.002% of all websites.
- 🏠 Website
- </> Source code
💸 Pricing
Cap is available for free.
📊 Rankings and Market Share
- Captchas
- Rank: 12
- Market share: 0.01%
- Spam Protection
- Rank: 15
- Market share: 0.009%
⚡ Sites Using Cap
We have data on 68 websites that use the Cap captcha service. Here is a list of some of the top ranked ones.
The highest rated site using Cap is spectable.com.
| # | Website | Rank | Country | Language |
|---|---|---|---|---|
| 1 | #87,217 | American English | ||
| 2 | #139,289 | Germany | German | |
| 3 | #329,357 | Chile | Spanish | |
| 4 | #374,382 | Chile | Spanish | |
| 5 | #429,606 | China | Chinese | |
| 6 | #450,606 | Canada | American English | |
| 7 | #464,456 | Germany | American English | |
| 8 | #485,491 | Chile | Spanish | |
| 9 | #507,692 | Austria | German | |
| 10 | #511,124 | China | Chinese | |
| 11 | #545,615 | Switzerland | English | |
| 12 | #570,575 | Chile | Spanish | |
| 13 | #583,472 | Chile | Spanish | |
| 14 | #605,612 | Chile | Spanish | |
| 15 | #677,090 | Chile | Spanish | |
| 16 | #679,796 | Chile | Spanish | |
| 17 | #749,848 | Chile | Spanish | |
| 18 | #764,762 | Chile | Spanish | |
| 19 | #785,093 | Chile | Spanish | |
| 20 | #788,531 | Chile | Spanish |
📈 Usage Statistics
Most of the sites that use Cap:
- are located in Chile
- have content in English
- use the .com domain extension
- fall into the Marketing/Merchandising category.
Most of the sites using Cap are from Chile, Switzerland, and Germany.
- Chile 21.3%
- Switzerland 13.1%
- Germany 9.8%
- Canada 8.2%
- France 6.6%
- United Kingdom 6.6%
- United States 6.6%
- Spain 4.9%
- China 3.3%
- Other 19.6%
Most Cap users speak English, Spanish, or German.
- English 45.6%
- Spanish 22.1%
- German 14.7%
- French 5.9%
- Chinese 2.9%
- Dutch 1.5%
- Portuguese 1.5%
- Arabic 1.5%
- Basque 1.5%
- Other 2.8%
The Cap captcha service is especially popular on .com, .cl, and .ch top-level domains.
- .com 33.8%
- .cl 17.6%
- .ch 11.8%
- .org 4.4%
- .ca 4.4%
- .de 4.4%
- .fr 2.9%
- .ru 1.5%
- .studio 1.5%
- Other 17.7%
The primary market segments for websites utilizing Cap include marketing and merchandising, online shopping, and education and reference.
- Marketing/Merchandising 23.1%
- Online Shopping 15.4%
- Education/Reference 15.4%
- Internet Services 7.7%
- Business 7.7%
- Health 7.7%
- Blogs/Wiki 7.7%
- Personal Pages 7.7%
- Fashion/Beauty 7.7%
🕵️ Similar Technologies
These are some of the best Cap alternatives.
🆚 Compare Alternatives
Compare Cap to…
- 🕵️ Similar services
- ⭐ Market leaders
- 💡 More alternatives
- 🔎 All options
💬 Frequently Asked Questions
Where is Cap from?
Cap is from Lisbon, Portugal.
Can I use Cap for free?
Yes, it is a free captcha service.
Moreover, it is an open-source solution and its code can be found on 
GitHub.
Which country uses Cap the most?
The majority of Cap users are from Chile.
Who uses Cap?
According to our data, Cap is used on at least 68 sites, including such established ones as spectable.com,
memorialmuseums.org, and
joyasbaron.cl.
👉 See Also
- ✨ Related technologies
JavaScript🗃️ About This Data
- We evaluate the popularity of technologies based on the number of websites where we detect their usage.
- Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
- This report is based on the analysis of 3,814,833 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.