The best alternatives to Flex are EC 2, Inspect, and Surge for Mac. If these 3 options don't work for you, we've listed a few more alternatives below.
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Best alternatives to Flex
  • Amazon Elastic Compute Cloud is a part of Amazon.com's cloud-computing platform, Amazon Web Services, that allows users to rent virtual computers on which to run their own computer applications.
  • Inspect is a new developer tool for macOS and Windows to inspect and debug your web apps and websites on iOS & Android devices.
  • Surge is a network toolbox for power users and a high-performance HTTP/SOCKS5 proxy server. It is capable of intercepting and logging the summary of network traffics, and meanwhile transmitting the traffic to other proxy servers according to the flexible rule system. Multiple proxy protocols are supported including HTTP, HTTPS, SOCKS5, SOCK5 over TLS.
  • HTTP Toolkit is a beautiful & open-source tool for debugging, testing and building with HTTP(S) on Windows, Linux & Mac.