The best alternatives to ThreatSlayer are Secret Photo Vault, SOLAR dVPN, and WebOProxy. If these 3 options don't work for you, we've listed a few more alternatives below.
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Keepsafe is a family of privacy apps which gives you control to protect your online privacy and personal space. Lock private photos & videos with Photo Vault. Use a burner phone app with Unlisted. Browse privately with a private browser app and VPN.
Meet the new era of web privacy with SOLAR dVPN. It is fully transparent, provides end-to-end encryption, but its main advantage is decentralizaion. Neither internet provider, nor government can block it. Never. More info in the first comment:
When you connect to a website through our web proxy, you aren't actually connecting to the website you're viewing. WebOProxy will connect to the website and pass it back along to you.