Software Alternatives, Accelerators & Startups

ALTCHA VS CapMonster Cloud

Compare ALTCHA VS CapMonster Cloud 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.

CapMonster Cloud logo CapMonster Cloud

AI-powered, low-latency CAPTCHA solver with a reliable API, ready SDKs and browser extensions, transparent pay-per-solve pricing (proxy included) — built to scale for developers, QA teams, scrapers and SaaS integrations
  • 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.

  • CapMonster Cloud Pricing
    Pricing //
    2025-08-28
  • CapMonster Cloud Captcha Solver CapMonster Cloud
    Captcha Solver CapMonster Cloud //
    2025-08-28

CapMonster Cloud is a cloud CAPTCHA-solving platform designed for teams that need dependable, high-throughput automation. It provides a developer-friendly REST/WebSocket API, ready-to-use libraries (C#, Python, JS, Go, PHP) and browser extensions so you can integrate solving into apps, bots or testing flows in minutes.

The service supports a broad set of CAPTCHA types — and advertises solution success rates up to ~99% for common types, making it suitable for production-scale scraping, automated testing and workflow automation.

Pricing is transparent and usage-based: you pay per successfully solved CAPTCHA (proxy included in price for many flows), with volume bonuses and affiliate options for partners. This model helps control costs for high-volume use cases while keeping billing predictable.

CapMonster Cloud emphasizes stability, scalability and quick onboarding (code examples, SDKs and demos), plus customer reviews and industry trust signals that highlight speed, accuracy and responsive support — a strong fit for SaaS vendors, data teams, QA/automation engineers and developer-led projects that require reliable CAPTCHA handling.

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.

CapMonster Cloud features and specs

  • Cost-effective
    CapMonster Cloud offers competitive pricing compared to other captcha-solving services, making it a budget-friendly option for automated tasks.
  • Speed
    The service is known for its fast captcha-solving capabilities, reducing downtime and improving efficiency in automated workflows.
  • API support
    CapMonster Cloud provides a robust API, allowing easy integration with various applications and platforms that require captcha solving.
  • High success rate
    The service boasts a high success rate in solving captchas, ensuring that tasks are completed with minimal errors.
  • Flexible usage
    Users can scale their usage up or down based on their needs, making it a versatile option for businesses with varying demands.

Possible disadvantages of CapMonster Cloud

  • Learning curve
    New users might experience a learning curve when setting up and integrating the service with their systems due to its comprehensive features.
  • Dependency on internet
    As a cloud-based service, CapMonster Cloud requires a stable internet connection, which might be a limitation in areas with poor connectivity.
  • Ethical considerations
    The use of captcha-solving services may raise ethical concerns, especially if used to bypass security systems without proper authorization.
  • Occasional downtime
    Like any cloud service, CapMonster Cloud may experience occasional downtime, potentially disrupting automated processes.
  • Limited to captcha types
    While CapMonster Cloud supports various captcha types, it might not be compatible with all, especially new or customized captcha formats.

Category Popularity

0-100% (relative to ALTCHA and CapMonster Cloud)
SPAM Protection
100 100%
0% 0
Captcha
29 29%
71% 71
Web Application Security
0 0%
100% 100
Security & Privacy
62 62%
38% 38

Questions & Answers

As answered by people managing ALTCHA and CapMonster Cloud.

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.

CapMonster Cloud's answer:

CapMonster Cloud is a cloud-based CAPTCHA solving service that combines high recognition accuracy, low latency, and a developer-friendly API. It supports a wide range of CAPTCHA types, offers flexible pricing, and scales easily for high-volume usage with ready-made SDKs and integrations.

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.

CapMonster Cloud's answer:

Because it delivers an excellent speed/accuracy balance for bulk CAPTCHA solving, is simple to integrate (REST API, WebSocket, official SDKs), provides transparent pricing and reliable infrastructure, and includes a user-friendly dashboard with request monitoring

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.

CapMonster Cloud's answer:

Our primary audience consists of SEO specialists, data parsing developers, automation (RPA) experts, marketers, and researchers who need to reliably bypass captchas in large volumes to automate their workflows.

What's the story behind your product?

CapMonster Cloud's answer:

The product was born out of necessity: a development team facing limits in existing CAPTCHA solutions built an internal, faster, and more accurate solver. That in-house tool evolved into a cloud product with a scalable architecture and easy integration paths so other teams can move from prototype to production quickly.

Who are some of the biggest customers of your product?

CapMonster Cloud's answer:

  • Large e-commerce platforms and marketplaces.
  • Price-comparison services and data aggregators.
  • Agencies and teams running large-scale ad/marketing automation.
  • SaaS providers that automate client workflows.
  • QA and testing teams running automated scenarios involving forms and authentication.

Which are the primary technologies used for building your product?

ALTCHA's answer

JavaScript and Svelte.

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare ALTCHA and CapMonster Cloud

ALTCHA Reviews

We have no reviews of ALTCHA yet.
Be the first one to post

CapMonster Cloud Reviews

  1. Good product

    The service works well, the support is very fast to respond which is a big plus. Only default is that they don't have european payment methods

    Competitors: 2captcha
  2. Simple API and solid documentation Works reliably in the background

    I've been using CapMonster Cloud for a little over a year now, mainly for number-based captchas. The flow on my side is straightforward: I send the image to the API, the universal module processes it, and the answer comes back within a couple of seconds. What I appreciate most is the API itself. The setup is very simple, one call to create a task and one to retrieve the result, and the documentation is clear with working examples for the main languages, so getting started took almost no time. The dashboard is also convenient, you can easily track balance usage and see how many requests were sent and how many solves came back successful, which makes it easy to monitor everything at a glance. Overall the service runs quietly in the background and handles its part of the work reliably, which is exactly what I needed.

  3. Hassan Alti
    · Freelancer at Solo ·
    Excellent CAPTCHA solving service - highly recommended

    Tested several CAPTCHA solving services and CapMonster Cloud offers the best combination of low cost and reliability. Haven't had any failed solves yet, and the pricing beats most competitors significantly. Easy API integration and fast response times. If you need bulk CAPTCHA solving, this is the most cost-effective option I've found.

    Pros:    Super fast|100% accurate result|100% error-free|Easy integration

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

CapMonster Cloud mentions (0)

We have not tracked any mentions of CapMonster Cloud yet. Tracking of CapMonster Cloud recommendations started around May 2023.

What are some alternatives?

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

reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.

2captcha - 2Captcha is a CAPTCHA-solving API for automating reCAPTCHA, Cloudflare, and other anti-bot challenges.

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.

CapSolver - The cheapest and fastest automatic captcha solution service supporting reCAPTCHA, Cloudflare, and many other popular captcha types

Cloudflare Turnstile - Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.

Anticaptcha - Anticaptcha is one of the most utilize captcha solving services that bypass any encryption and provide you and automation protected there for your web-app and website bypassing service.