Apollo Client

Apollo Client is a comprehensive GraphQL client for JavaScript applications, providing caching, state management, and integrations with React, Angular, Vue, and other frameworks. The current stable version is 4.1.9 (2025-01-14), with a legacy v2.6.10 still in use. Major versions have breaking changes: v3 introduced a new package structure (@apollo/client), removed the separate apollo-boost preset, and switched to a single combined package. v4 (alpha) introduces modern method signatures. Key differentiators: normalized in-memory cache, optimistic UI, pagination helpers, and developer tools. It requires a GraphQL schema and is compatible with any GraphQL server. Release cadence is rapid with frequent patches.