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* https://usabilityhub.com - Test designs and mockups on real people, track visitors. Free for one user, unlimited tests. |
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* https://gosquared.com - Track up to 1,000 data points for free. |
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* https://mixpanel.com - Free 25000 points or 200000 with their badge on your site. |
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* https://keen.io - Custom Analytics for data collection, analysis and visualization. 50,000 events/month free |
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## International Mobile number verification API and SDK |
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