
ALTCHA
reCAPTCHA
hCaptcha
Cloudflare Turnstile
Private Captcha
Akismet
mosparo
Cap Captcha
SHIELD
SEON
FingerprintJS
Rupt
Castle
ThumbmarkJS
Infracost
Sift
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 compliant with GDPR.
SHIELD is a device-first fraud intelligence platform built on the world’s most persistent device identification technology across applications and platforms.
Powered by SHIELD AI and patented technology (SHIELD Sentinel), SHIELD sets the global standard for device identification (SHIELD Device ID) and exposes the full range of fraud tools and techniques through more than 20 risk indicators, delivering real-time, actionable fraud intelligence across all use cases and industries worldwide.
Trusted by global unicorns including inDrive, Alibaba, Deliveroo, Meesho, TrueMoney, Unico ID and OLX, SHIELD operates with teams across Los Angeles, São Paulo, London, Berlin, Jakarta, Bangkok, Bengaluru, Beijing and Singapore, advancing our mission: to eliminate unfairness and enable trust for the world.
For more information, visit shield.com.
ALTCHA
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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.
SHIELD's answer:
Most fraud solutions are web-first and rely heavily on personal data and static identifiers that are easily bypassed. They are also often focused on addressing fraud at specific checkpoints. SHIELD is device-first. Fraudsters can spoof data, accounts, and even identities, but they always need a device to act. This is why we stop fraud at the root.
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.
SHIELD's answer:
Our plug-and-play SDKs and lightweight JavaScript snippets can be integrated in a matter of hours — not weeks or months. There’s no training period required, enabling your team to start detecting fraud immediately. Most customers see tangible results on day one, with zero disruption to existing workflows.
ALTCHA's answer
JavaScript and Svelte.
SHIELD's answer:
SHIELD deliver real-time device intelligence globally, with offices in San Francisco, Singapore, Jakarta, Dubai, London, São Paulo, and more. We are a global team, which helps us stay close to the latest fraud trends, and our clients.
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.
SHIELD's answer:
SHIELD works with digital businesses across every region and industry where trust and safety are mission-critical. Our customers include global unicorns and fast-scaling platforms in mobility, fintech, e-commerce, igaming, digital identity, and more. If your platform faces fraud, or trust & safety challenges, SHIELD can help you eliminate malicious users and scale growth with confidence.
SHIELD's answer:
inDrive, Truemoney, Maya, Swiggy, Buymed, Atlas, MPL,
Based on our record, ALTCHA seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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 / 4 months ago
Here's how PoW works for form protection (using the ALTCHA wire format):. - Source: dev.to / 5 months ago
Go based, similar to JS based ALTCHA https://altcha.org/ discussed at https://news.ycombinator.com/item?id=43971068. - Source: Hacker News / 9 months ago
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
SEON - SEON Sense Platform is a modular and AI-powered fraud detection software that deliver clear results with an automated, machine-driven workflow.
hCaptcha - 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.
FingerprintJS - Fraud detection and prevention using browser fingerprinting with 99.5% accuracy. Stops account sharing, payment processing fraud and gaming.
Cloudflare Turnstile - Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
Rupt - Prevent fraud and grow your revenue.