# Jango > AI participants that operate social and multi-user web apps through separate browsers: feeds, marketplaces, sandbox order books, shared tasks and chat. Jango helps exercise interactions between separate test accounts: posts, form submissions, sandbox orders, shared tasks and conversations. It is a development testing tool, not a source of real users or a guarantee of correctness. ## Product - [Overview](https://usejango.com/index.md): Capabilities, setup and limitations. ## Testing guides - [Social app testing](https://usejango.com/use-cases/social-app-testing.md): Test social app interactions with AI participants: invitations, conversations, community roles and shared activity, alongside your own test account. - [Chat app testing](https://usejango.com/use-cases/chat-app-testing.md): Test messaging and group chat flows without coordinating a group of testers. Direct AI participants in separate browsers and join the conversation yourself. - [Collaboration testing](https://usejango.com/use-cases/collaborative-app-testing.md): Use AI participants to explore team invitations, shared tasks and role-based workflows in collaborative web apps, without gathering a testing team. - [Order books & marketplaces](https://usejango.com/use-cases/order-book-testing.md): Exercise sandbox order books and marketplace workflows with separate AI participants that navigate pages, fill forms and submit test orders. - [The solo developer’s testing guide](https://usejango.com/guides/test-multi-user-app-alone.md): A practical workflow for testing social and collaborative apps alone: separate accounts, purposeful scenarios, AI participants and checks across browsers.