SaaS vs. Sentinel

ALTCHA SaaS services hosted at eu.altcha.org/app and us.altcha.org/app will remain operational. However, users are encouraged to migrate to Sentinel, our new flagship product.

Sentinel offers several key advantages:

Enhanced data privacy and security through self-hosting
No limits on domains, verifications, or requests
Support for Adaptive Captcha
An upgraded Classifier replacing the legacy SpamFilter

Self-Hosting

We understand that self-hosting can be technically demanding. That’s why ALTCHA Sentinel includes embedded components, such as a preconfigured database, to simplify deployment—while maintaining strong security standards out of the box.

Thanks to our deployment scripts, you can get Sentinel up and running securely within minutes:

Discount for SaaS Customers

If you’re an existing ALTCHA SaaS customer, you’re eligible for a one-time discount on a Sentinel license equal to the total amount you’ve previously paid for the SaaS service.

To claim your discount code, visit eu.altcha.org/license and click Get Discount.

How to apply the discount:

Select your license and support plan, then click Checkout.
In the checkout dialog, click Add discount.
Enter the discount code you received via email (after requesting it through Get Discount).
Click Apply and verify that the discount has been applied.
Enter your email address and click Continue to complete the checkout.

Terms and Conditions:

The discount can be used only once (on a single payment) and does not apply to recurring payments. For maximum value, consider choosing an annual billing cycle.
Discount codes are transferable—you’re welcome to share yours with a friend or colleague—but can only be redeemed once.
The discount amount equals the total of your past payments for SaaS services, excluding VAT or other taxes. Example: If you’ve made 6 payments of €9/month (excl. VAT), your discount will be €6 × 9 = €54.
Customers can apply for a discount until July 31, 2025. The discount coupon must be used within 90 days of issuance.