In the past, Crowdflower monthly fees may have peaked in the neighborhood of $11,000 each month plus a 15 percent fee on the amount paid to workers. A screenshot of Crowdflower's past pricing screen is seen in a requester's write-up on an experience with Crowdflower. If you draw some inferences from information available on the web, you have an assumed estimate of some of the fees charged by Crowdflower and Clickworker.
Start finding out exactly what it's like to use Mturk alternatives while providing little or no information about your organization. Several sites like Mturk allow you to begin typing in a job to try out the process, and some even begin providing you with customized price information. Be sure you know where to go on each website because sometimes these pages are difficult to find.
Clickworker charges a fee for posting paid tasks, but they won't tell you how much. According to the Clickworker FAQ page, fees are discussed once you make contact with the website. Other sites like Mturk charge a requester as little as 7% on top of the amount paid to the worker, or as much as 45% on top of the amount paid to the worker.
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