With Amazon Mobile Analytics, you pay only for what you use, with no contracts or monthly active user charges. Amazon Mobile Analytics is free up to 100 million events per month, and costs just $1.00 per million events above the free tier.
Process up to 100 million basic session and custom events per month for free. $1 per million thereafter.
If you have enabled the Auto Export options in Amazon S3 or Amazon Redshift, there may be additional charges. To learn more about pricing, check out an example scenario