Lenz Invisible Captcha | Form bot safety
In-App Purchases
Subscriptions
Description
Highlights
Features
About the Extension
This extension reliably protects your forms from spam registrations and unwanted contact requests – without any annoying captcha queries for your customers.
Instead of visible puzzles or image selection, the extension works with an invisible captcha that checks in the background whether it is a genuine user action. This maintains the user-friendliness of your shop while effectively blocking automated spam bots.
The extension is quick and easy to set up and is ready to use immediately. No complex settings or external services are required.
Optionally, you can customise the behaviour of the captcha to suit your requirements by setting the minimum time for submitting forms or disabling mouse and touch tracking if necessary.
Under the ‘Captcha IP Lists’ menu item, you can selectively allow or block individual IP addresses. Whitelisted IPs bypass the Captcha check entirely – ideal for internal testing. Blacklisted IPs, on the other hand, are consistently blocked.
In the Captcha statistics, you’ll find clear daily statistics. These show you at a glance how many Captchas were triggered per day and how many of these were successfully solved or rejected. This allows you to quickly spot unusual activity.
You can optionally enable debug logging in the extension’s settings to log rejected CAPTCHA attempts. If a CAPTCHA attempt is rejected, the customer will now be shown an incident ID and an error code, which can be forwarded to customer support for investigation.
In-app purchases: Features
The extension includes in-app purchases. The following features are included in the basic version and in the in-app subscription:
- Basic version (free): The Basic version includes a daily quota of 10 Captcha validations.
- "50 Captcha Checks per Day" subscription: With this subscription, 50 Captcha validations are performed per day.
- "Unlimited Captcha Checks per Day" subscription: There is no daily limit on Captcha checks with this subscription.
Options
Basic Configuration
- Minimum time to submit (milliseconds): Minimum time in milliseconds between form load and submit. The default setting ist 3000 milliseconds (3 seconds).
- Proof-of-Work difficulty (leading zero bits): Higher values increase the CPU load for bots.
- Enable mouse and touch tracking: Tracks mouse movements, touch events and keyboard inputs to detect human interaction.
- Enable debug logging: When enabled, every rejected captcha attempt is written to the application log together with the full request data and a unique error ID that is shown to the customer. Use this to investigate why a specific customer cannot submit a form.
Rate limiting (bot protection)
- Enable rate limiting: This option temporarily blocks an IP address that has submitted too many forms or requested too many CAPTCHA challenges within a short period of time.
- Time window (seconds): This option defines the length of the rolling time window during which successful submissions and challenge requests are counted. Default: 600 seconds
- Max. successful submissions per window: Specify how many successful Captcha checks a single IP address is allowed to perform within the time window before it is blocked. The value should not be set too low, so as not to affect shared IP addresses. Default: 20
- Max. challenge requests per window: Define how many Captcha challenges a single IP address is permitted to request within the time window before it is blocked. Default: 120
- Minimum seconds between challenges: This option specifies the minimum number of seconds that a single IP address must wait between two challenge requests. Default: 2 seconds
- Block duration (seconds): This option defines how long an IP address remains blocked after exceeding a threshold. The threshold should be kept deliberately low so that false positives resolve themselves quickly: Default: 600 seconds
- Enable adaptive Proof-of-Work difficulty: This option increases the PoW difficulty for IP addresses with a high number of recent successful submissions, making rapid automated submissions increasingly costly without affecting normal visitors.
Details
- Available: English, German
- Latest update: 25 August 2026
- Publication date: 11 May 2026
- Version: 7.0.4
- Category: Special features
Resources
Reviews (1)
Effektiver Spamschutz – ohne Frust für die Kunden
Von uns eine klare Kaufempfehlung!
About the Extension Partner
LENZ eBusiness GmbH
Partner Status
-
Shopware
Bronze Partner -
Shopware
Premium Extension Partner
Details
- Ø-Rating: 4.9
- Partner since: 2014
- Extensions: 93
- Certifications: 5
Support
- Based in: Germany
- Speaks: German, English
- Response time: Very quickly