
reCAPTCHA
hCaptcha
Cloudflare Turnstile
Akismet
Private Captcha
mosparo
Cap Captcha
ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.

CloudFlare
Amazon CloudFront
Pulse Secure
Sucuri
Flexera Software Vulnerability Manager
Tor Browser
Imperva Cloud Application Security
Secure Content Delivery Network, DDoS, WAF Service
Which is more popular?
Based on our record, ALTCHA should be more popular than StackPath. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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In their own words, as submitted to SaaSHub.


ALTCHA uses a proof-of-work mechanism to protect your website, APIs, and online services from spam and unwanted content. Unlike other solutions, ALTCHA is free, open-source and self-hosted, without external services, does not use cookies nor fingerprinting, does not track users, and is fully...
No description of StackPath yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of ALTCHA yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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How to Fully Connect WordPress Site with StackPath CDN
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and StackPath.
ALTCHA's answer
What makes ALTCHA unique is that it is free, open-source and self-hosted, without external services, does not use cookies nor fingerprinting, does not track users, and is fully compliant with GDPR. Unlike other captcha solutions, ALTCHA does not require users to solve puzzles or captchas and uses a proof-of-work mechanism instead.
ALTCHA's answer
Here are some key reasons why a person should choose ALTCHA over its competitors:
So in summary, ALTCHA's privacy compliance, open design, accessibility, machine compatibility and modern approach give it clear advantages over competing captcha solutions.
ALTCHA's answer
JavaScript and Svelte.
ALTCHA's answer
Our primary audience for ALTCHA Forms includes enterprises, medium and small businesses, non-profits, and individuals who need a reliable, secure, and compliant solution for data collection and management. Whether you're a large corporation dealing with extensive regulatory requirements, a small business looking to protect customer and employee data, a non-profit organization managing sensitive information, or an individual seeking robust data security, ALTCHA Forms provides the tools and features necessary to meet your needs. With a focus on compliance, user-friendly design, and advanced security measures, our platform is tailored to support diverse users in navigating complex regulatory landscapes and ensuring data protection.
Share your experience with using ALTCHA and StackPath. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


We have no reviews of ALTCHA yet. Be the first one to post
StackPath was founded in 2015 by Lance Crosby but now operates under the same people who ran SoftLayer, a cloud solutions and services provider, bought over by IBM. Having acquired several strategic companies,...
Stackpath also provides security features, such as SSL, DDoS protection, WAF, and firewall, to protect your web content and applications. Stackpath has a simple and transparent pricing model and a user-friendly...
StackPath offers content shipment services with WAF and totally recorded API. It provides services with instant setup, purging and real-time circumstances. Stack path offers plans for mid to high range users which are...
Recommendations tracked on public social media and blogs since March 2021.


ALTCHA won on the boring things. It is open source, self-hosted and collects nothing, and it ships official libraries in both Go and PHP, the two languages our two layers already speak. So the same protocol runs twice on every store, by... - Source: dev.to / 11 days ago
The captcha on orkestr is Altcha. Self-hosted, no third-party JS, no Google, no behavioral tracking. Users don't see a puzzle. There's a single checkbox and a quiet "verifying..." while the browser does some math. About a second, total. - Source: dev.to / 5 months ago
Here's how PoW works for form protection (using the ALTCHA wire format):. - Source: dev.to / 7 months ago
StackPath (Dallas, Texas) | Remote | Full-Time | https://stackpath.com I am looking for Senior Systems Engineer for our Kubernetes infrastructure: https://stackpath.applytojob.com/apply/kLd89ZuXsV/Senior-Systems-Engineer The Systems... - Source: Hacker News / over 4 years ago
When comparing ALTCHA and StackPath, you can also consider the following products.

reCAPTCHA is a free security service that protects your websites from spam and abuse.
Compare reCAPTCHA to ALTCHA or StackPath:

Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
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Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
Compare hCaptcha to ALTCHA or StackPath:

Amazon CloudFront is a content delivery web service.
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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
Compare Cloudflare Turnstile to ALTCHA or StackPath:

Pulse Secure provides a consolidated offering for access control, SSL VPN, and mobile device security. Contact Pulse Secure at 408-372-9600 to get a free demo.
Compare Pulse Secure to ALTCHA or StackPath: