The best alternatives to HackerOne are WhiteHub, Bounty Jungle, and BountyPage. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
WhiteHub connects white-hat hackers and businesses to find out security vulnerabilities within the products. When businesses use WhiteHub, they just need to pay for valid vulnerabilities that are based on the bounty policy in a bug bounty program.
BountyPage is an all-in-one platform that makes it easy to start and manage crowd-sourced vulnerability disclosure programs. It is an easy-to-use and accessible solution that enables you to launch a bug bounty program quickly and scale up over time.
Founded in 2015, YesWeHack is a global Bug Bounty and VDP Platform. YesWeHack offers companies an innovative approach to cybersecurity with Bug Bounty (pay-per-vulnerability discovered), connecting more than 45,000 cybersecurity experts (ethical hackers) across 170 countries with organisations to secure their exposed scopes and reporting vulnerabilities in their websites, mobile apps, infrastructure and connected devices.