Software Alternatives, Accelerators & Startups

ALTCHA VS SHIELD

Compare ALTCHA VS SHIELD and see what are their differences

ALTCHA logo ALTCHA

ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.

SHIELD logo SHIELD

Stop fraud and reduce friction across web and mobile apps with real-time device intelligence.
  • ALTCHA Simple, user-friendly verification.
    Simple, user-friendly verification. //
    2024-04-30

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
    Image date //
    2026-08-05
  • SHIELD
    Image date //
    2025-06-05
  • SHIELD
    Image date //
    2026-08-05
  • SHIELD
    Image date //
    2026-08-05

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

Website
altcha.org
Pricing URL
-
$ Details
free
Platforms
Web REST API
Release Date
-

SHIELD

Website
shield.com
$ Details
paid Free Trial
Platforms
Windows Linux iOS Android
Release Date
2008 December
Startup details
Country
Singapore
State
Singapore
Founder(s)
Justin Lie
Employees
100 - 249

ALTCHA features and specs

  • Privacy-friendly, GDPR compliant
    No cookies, no tracking, no external servers.
  • Frustration-free
    No visual puzzles. PoW Captcha is better for people.
  • Spam Filtering
    Employs machine learning to categorize submitted data and identify unwanted messages.
  • Open-source
    Free to use, free to modify. MIT licensed.
  • End-to-End Encryption
    The Encryption Shield mitigates data breaches by encrypting data with asymmetric end-to-end encryption.
  • Digital e-Signatures
    e-Signatures made easy with eIDAS-compliant simple and advanced signatures - qualified digital certificates and DigiDoc.
  • Visual Form Builder
    Create custom forms effortlessly with the visual form builder, empowering users to design tailored solutions without any coding expertise.
  • File Attachments
    Safely request and securely store file attachments with end-to-end encryption, ensuring the utmost protection for your data.
  • Send to Email or Webhook
    Configure forms to seamlessly send data to email, APIs, or webhooks using processors, facilitating efficient data handling and integration with your workflows.

SHIELD features and specs

  • Device-First Fraud Intelligence Platform
    Stop fraud and reduce friction across web and app with real-time device intelligence.
  • Device Fingerprinting
    Stop Fraud at the Root with Device Identification & Intelligence
  • AI Fraud Detection Platform
    Stay ahead of complex fraud threats with our no-code feature engineering suite

Analysis of SHIELD

Overall verdict

  • SHIELD is a well-regarded device intelligence and fraud prevention platform that helps businesses combat fake accounts, fraud, and abuse through advanced device fingerprinting and risk intelligence, making it a strong choice for companies with high fraud exposure.

Why this product is good

  • Offers robust device fingerprinting technology (SHIELD Device ID) that accurately identifies devices even when fraudsters attempt to mask their identity
  • Provides real-time fraud detection and risk intelligence to prevent fake accounts, promo abuse, and payment fraud
  • Trusted by large marketplaces, fintech, and gig economy platforms across the globe
  • Helps reduce financial losses and improve trust and safety for digital platforms
  • Delivers actionable risk signals that can be integrated into existing fraud workflows

Recommended for

  • E-commerce and online marketplaces facing account fraud and promo abuse
  • Fintech and payment companies needing strong fraud prevention
  • Gig economy and ride-hailing platforms combating fake accounts
  • Gaming and social platforms dealing with bots and multi-accounting
  • Enterprises requiring scalable device intelligence and trust & safety solutions

ALTCHA videos

No ALTCHA videos yet. You could help us improve this page by suggesting one.

Add video

SHIELD videos

SHIELD x HappyFresh(Online grocery marketplace)

More videos:

  • Review - SHIELD x OVO (Indonesia’s leading payments platform)
  • Review - SHIELD x Atlas Reality
  • Review - SHIELD x Dunzo - Hyperlocal Delivery Platform
  • Review - SHIELD x TrueMoney
  • Review - M&P Shield X
  • Review - Smith & Wesson M&P Shield 9mm - Guide and Review
  • Review - S&W M&P Shield Plus 1000 Round Review: The Best Micro Pistol

Category Popularity

0-100% (relative to ALTCHA and SHIELD)
SPAM Protection
100 100%
0% 0
Fraud Detection And Prevention
Captcha
100 100%
0% 0
Security & Privacy
59 59%
41% 41

Questions & Answers

As answered by people managing ALTCHA and SHIELD.

What makes your product unique?

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.

Why should a person choose your product over its competitors?

ALTCHA's answer

Here are some key reasons why a person should choose ALTCHA over its competitors:

  • Privacy compliance - ALTCHA is fully compliant with privacy regulations like GDPR since it does not use cookies, fingerprinting or track users. This is a major advantage over other captcha solutions.
  • Open source and self-hosted - ALTCHA is free, open source software that can be self-hosted without relying on external services. This gives more control and independence to the user.
  • Accessible design - ALTCHA uses a proof-of-work mechanism instead of puzzles or captchas, making it more friendly and accessible for humans. Captchas can be difficult for some users.
  • Machine compatibility - ALTCHA is designed to also work for machines and APIs, making services accessible for bots and automated systems. Other solutions may not be as compatible.
  • Modern approach - ALTCHA represents a privacy-first, inclusive approach to spam protection as opposed to traditional captcha methods. This future-proofs the solution.
  • Effective spam filtering - In addition to proof-of-work, ALTCHA also offers an effective spam filter module to block sophisticated spam attacks. This provides comprehensive protection.

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.

Which are the primary technologies used for building your product?

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.

How would you describe the primary audience of your product?

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.

Who are some of the biggest customers of your product?

SHIELD's answer:

inDrive, Truemoney, Maya, Swiggy, Buymed, Atlas, MPL,

User comments

Share your experience with using ALTCHA and SHIELD. For example, how are they different and which one is better?
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Social recommendations and mentions

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.

ALTCHA mentions (3)

  • A self-hosted Google reCAPTCHA alternative (we ship 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
  • Why Proof-of-Work Beats CAPTCHA for Form Protection
    Here's how PoW works for form protection (using the ALTCHA wire format):. - Source: dev.to / 5 months ago
  • Wicketkeeper – privacy-friendly, self-hostable PoW CAPTCHA
    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

SHIELD mentions (0)

We have not tracked any mentions of SHIELD yet. Tracking of SHIELD recommendations started around Jun 2025.

What are some alternatives?

When comparing ALTCHA and SHIELD, you can also consider the following products

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.