
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.

Bandwidth
Plivo
Twilio
MessageBird
Telnyx
APIs for the next generation of business text messaging.

Which is more popular?
Based on our record, ALTCHA seems to be more popular. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | altcha.org | telgorithm.com |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from the United States |
| 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...
Telgorithm is a cutting edge messaging API provider specializing in 10DLC text messaging. Telgorithm enables software providers to send high-volume business text messages at the highest delivery rates in the industry, 99%+ on average. Telgorithm combines timely customer support, expert-level...
What each product offers, as listed by its team.


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.
Avoiding A2P 10DLC Disruptions with The Campaign Registry | Business SMS Webinar
More videos
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and Telgorithm.
Telgorithm's answer:
Telgorithm was established in 2021 by telecom veterans who, with 20+ years of experience, saw a massive need to set a new standard for quality, support, and transparency in the cloud communication space - particularly for A2P 10DLC messaging.
Telgorithm was founded on the principles of transparency, customer experience, responsibility, education, and empathy. We’ve developed innovative technology solutions for 10DLC messaging, but our services go far beyond our API product. Telgorithm is committed to providing the guidance and support needed to be successful in the evolving A2P landscape.
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.
Telgorithm's answer:
Telgorithm enables software providers (platforms or applications) to send high-volume business text messages at the highest delivery rates in the industry, 99%+ on average.
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.
Telgorithm's answer:
Telgorithm is the only messaging API provider to offer deliverability and message management technology in the industry. Never let your customers exceed 10DLC Carrier limits again. Our Smart Queueing technology saves an average of 20% of 10DLC messages from failing, improving your customer’s deliverability and per-message savings. Learn more about our patent-pending tech here: https://www.telgorithm.com/smart-queueing/
Telgorithm's answer:
Constant Contact, Boulevard, OnlySales and more. Hear from Telgorithm customers about their experience with our product and service here: https://www.telgorithm.com/customer-stories/
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.
Share your experience with using ALTCHA and Telgorithm. For example, how are they different and which one is better?
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 / 12 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
Tracking Telgorithm since Feb 2023.
When comparing ALTCHA and Telgorithm, you can also consider the following products.

reCAPTCHA is a free security service that protects your websites from spam and abuse.
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Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.
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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.
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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
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Brings voice and messaging to your web and mobile applications.
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