
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.

Which is more popular?
Based on our record, Linktree seems to be a lot more popular than ALTCHA. While we know about 141 links to Linktree, we've tracked only 3 mentions of ALTCHA.
Website, pricing, platforms and company facts side by side.
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| Website | altcha.org | linktr.ee |
| Pricing | ||
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| Company | — | Startup from Australia · 10 - 19 employees · 2016 |
| Listed in |
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...
Linktree is the launchpad to your latest video, article, recipe, tour, store, website, social post - everywhere you are online. Join over 10 million of the world's biggest influencers, creators, publishers and brands using Linktree in their marketing strategy.
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.
No ALTCHA videos yet. You could help us improve this page by suggesting one.
REVIEW | Use LINKTREE To Add More Links To Your INSTAGRAM BIO | EP 19
More videos
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and Linktree.
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 Linktree. 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
The alternative most similar to ContactInBio is Linktree. Like ContactInBio, Linktree lets you create a landing page with multiple links. You can customize that page to match your brand, track the performance of links...
Linktree is the most popular Link In Bio tool out there. It has more than 50 million users around the world. Everybody knows the name. But, as it usually goes, the most popular tool is not the best one. In 2024, there...
Linktree boasts a wide range of integrations, making it incredibly functional for businesses and influencers who want to connect their audience to different platforms. From social media channels to payment gateways,...
Recommendations tracked on public social media and blogs since March 2021.


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 / 6 months ago
Go based, similar to JS based ALTCHA https://altcha.org/ discussed at https://news.ycombinator.com/item?id=43971068. - Source: Hacker News / 10 months ago
Linktree: The classic choice for housing all your links (GitHub, LinkedIn, Blog) in one spot. - Source: dev.to / 9 months ago
As with any CMS I come across, I try to use it with an application. This time I decided to use Astrolink, a minimal alternative to Linktree. You can check it out on a demo page, or see it's details in Astro theme catalog. - Source: dev.to / over 1 year ago
When I first wrote about my pointless personal side projects a few months ago, I used the software I had written to generate my own link site (like a LinkTree clone) as an example. - Source: dev.to / almost 2 years ago
When comparing ALTCHA and Linktree, 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 Linktree:


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 Linktree:

Monetize your TikTok, Twitter, and Instagram bio links
Compare Beacons to ALTCHA or Linktree:

Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
Compare Cloudflare Turnstile to ALTCHA or Linktree:

Turn your link in bio into a navigation hotspot with Taplink's professional templates and drag-and-drop functionality.
Compare Taplink.at to ALTCHA or Linktree: