Yandex SmartCaptcha

A service for verifying queries to identify user requests and block bots. No need for users to identify images — in most cases, clicking I’m not a robot is enough.

Console Documentation

Query analysis

The service identifies requests similar to automatic ones, identifies bots and filters them out without loss of response speed. For analysis, we use ML models trained on datasets containing data on many years of experience in protecting Yandex web resources. The datasets are regularly updated.

Intermediate verification

First, the user will see a simple task: an “I’m not a robot” checkbox or a slider. The service then analyzes the request, and if it seems suspicious, it shows a more complex CAPTCHA: a picture or text that more effectively filters out robots.

Unique texts and images

The service does not use ready-made images, but generates them independently, making it possible to maintain an 85% level of human recognition while keeping it difficult for bots to recognize the CAPTCHA.

Adjustable difficulty

Choose an easy, medium or high level of complexity for the phrases SmartCaptcha generates base on your needs.

Learn more

A secure solution

SmartCaptcha is deployed in the Yandex Cloud infrastructure, which complies with international standards and Russian information security laws.

Security

Invisible captcha

Add verification to your site without the “I’m not a robot” button. An invisible captcha will only be seen by users with suspicious looking requests.

Learn more

SmartCaptcha task types

“I’m not a robot” checkbox

An straightforward task that can serve as one of the first steps of the captcha.

Try it yourself

Getting started

Create a captcha, select a format, and copy the code.

Create

FAQ

How do I use SmartCaptcha?

To use SmartCaptcha, you need to get client and server side keys. Using the client key, you can add the SmartCaptcha widget to your page. The server key lets you verify user responses. To get the keys, create a new captcha.

Console

How do I connect the SmartCaptcha widget to my website?

How do I manage access to the service?

What kinds of tasks does the service offer?

Tasks come in two types: simple and additional. Simple tasks include the “I’m not a robot” checkbox, slider, and the invisible CAPTCHA:

Checkboxes are a common task and therefore familiar to users.
Sliders are a good choice for mobile devices.
The invisible CAPTCHA allows you to check a user without showing them a checkbox or slider. Users whose requests seem suspicious will see an additional task. There are three types of additional tasks:
text recognition,
silhouettes,
kaleidoscope. These tasks are a bit harder for humans, but filter out robots more efficiently. Tasks with images do not require localization and work if your users do not know Russian and English. Moreover, these tasks don’t require a keyboard. Please note that the slider, kaleidoscope, and silhouettes features are at the Preview stage.

Get started with Yandex SmartCaptcha