ATAC is an open-source, offline API client for desktop platforms, offering a Postman-like user interface. It supports all essential API testing features, including scripting and multi-platform compatibility, making it a robust tool for developers and testers who need a free, privacy-focused alternative.
ATAC sits in PulseGate's API design, testing & docs category. It focuses on testing and managing API requests locally without relying on cloud-based tools. It is built as an open-source project for developers and API testers. ATAC is open source under the MIT license. It runs on the web, Windows, macOS, and Linux, and it can be self-hosted.
Julien Caposiena builds and maintains ATAC, and the product first shipped in 2024. Development happens publicly on GitHub with 3.6k stars. PulseGate's similarity index finds few close equivalents — ATAC occupies a relatively distinct niche. Key capabilities include Postman-like UI, offline mode, and open source.
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