hCaptcha Frequently Asked Questions

How long is a typical visitor's hCaptcha session?

Client-side interactions are about the same as a traditional captcha: 1-10 seconds.

When are multiple captchas required?

This depends on our confidence in their humanity, the site difficulty setting, and other security factors. The very first time we see a user, we may ask more than one question. When a user fails a captcha, a new one will also be presented to the user.

What browsers are supported?

The following browsers are fully supported by hCaptcha checkbox:

  • Mozilla Firefox
  • Google Chrome
  • Microsoft Edge
  • Apple Safari
  • iOS (>10)
  • Android (>Marshmallow)

Currently, Internet Explorer 8, 9, and 10 have reduced support.

The following browsers are fully supported for the hCaptcha dashboard:

  • Mozilla Firefox
  • Google Chrome

Currently, Microsoft Edge and Apple Safari have partial support.

How long is a typical visitor's hCaptcha session?

Client-side interactions are about the same as a traditional captcha: 1-10 seconds.

What controls the type of questions shown? OCR, images, etc?

Behind the scenes of hCaptcha.com, a real-time bidding system operates to match requesters of tasks and those doing the work. The type of task shown will generally be the one that is currently the highest bid for a given labor pool.

What are the difficulty levels for the challenges, and how are they selected?

Different task types have different intrinsic difficulties associated with them. For example, picking the images that match a single simple criteria generally takes most people about the same amount of time. We use this in combination with the site difficulty level you select to decide what to show a user.

Currently, we have 3 difficulty levels available: Easy, Medium, and Hard.

Setting a different difficulty level influences how often your users see a captcha, as well as how much your site will earn.

How much should I expect to earn from hCaptchas?

Site earnings vary based on three key factors: the number of answers users supply, the correctness of those answers, and real-time demand for the work.

It is difficult to predict exactly what your earnings will be, as prices for a given job type vary based on the demand in the system as represented by bid prices.

Many people are also not aware of how much bot traffic is already on their site. It is typically not safe to assume that pageviews to a login page are equivalent to real human beings, for example.

However, a good rule of thumb is that market prices tend to vary between $1 per hundred answers and $1 per thousand answers.

Is "NUMBER OF CAPTCHAS PASSED" the same as number of answers earning compensation?

No: for example, this number counts automatically approved users who have not been prompted to answer a question at all, based on their likelihood of being a bot and your site difficulty setting.

When do I get paid, and in what form am I getting paid?

Reconciliation and validation happens periodically, so it may take some days or even a week to see your "HMTs earned" count move up for a new account.

Sophisticated anti-fraud measures are employed to detect and mitigate unearned allocation of HMTs, and some of them can only be run once some percentage of a job is completed.

The native medium of exchange on hCaptcha is the HUMAN Token (HMT), which can be used to request tasks within systems running on the HUMAN Protocol.

You should not assume that a HMT has intrinsic value beyond its utility within the system, and utility of a single HMT also varies over time based on a variety of factors.

Please note: hCaptcha website owners located within the United States and Canada do not earn HMT, and no direct HMT withdrawals are available to them.

For US and Canadian users, HMT points accrued may be used via hCaptcha for labeling jobs on the hCaptcha site. HMT accruals that reach a minimum threshold may also be converted quarterly to USD, at a rate set periodically by hCaptcha, with payment received via PayPal or bank wire.

What Personally Identifiable Information is hCaptcha collecting?

hCaptcha collects user keypress events, touch events, device motion events, and acceleromator (if applicable) events.

Other user data, such as browser user-agent, browser features/add-ins, user IP address, and host address (the URL where the captcha is being served).

All events are logged with a timestamp from the start of the captcha interaction to the end of the interaction. This means, if the captcha changes state, or is reset, this data is sent to the server.

This data is used to determine human confidence, as well as aggregate overall captcha completion.

How long is this data stored for?

In compliance with EFF's DNT policy, this data is stored for one week (7 days).

Help! I have another question not answered here, or need to update my geographic location.

No problem! Just send us an email at [email protected] and we'll be glad to help.