AWS AppSync is described as 'Enterprise-level, fully managed GraphQL service with real-time data synchronization and offline programming features' and is an app. There are three alternatives to AWS AppSync for a variety of platforms, including Linux, SaaS, Web-based, Self-Hosted and Mac apps. The best AWS AppSync alternative is Apache APISIX, which is both free and Open Source. Other great apps like AWS AppSync are Kong and Apigee.
Apache APISIX is an open-source cloud-native API gateway with dynamic, real-time and high-performance features, based on the NGINX library and etcd.
Kong is a scalable, open source API layer (also known as a API gateway, or API middleware). Kong runs in front of any RESTful API and is extended through plugins, which provide extra functionalities and services beyond the core platform.
Apigee is a free tools platform for developers and API providers to debug, test, protect and get analytics on APIs.
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