Amazon AppSync

What Amazon AppSync is

Amazon AppSync connects applications to data, events, and AI models through GraphQL and pub/sub APIs. A single GraphQL request can access multiple databases, microservices, and AI models. Data sources include Lambda, DynamoDB, Aurora, OpenSearch, HTTP endpoints, EventBridge, and Amazon Bedrock Runtime. AppSync Events supports publishing and subscribing to real-time events over WebSockets, while Merged GraphQL APIs combine schemas, data sources, and resolvers from multiple source APIs behind one endpoint. Authorization options include API keys, OIDC, Amazon Cognito, IAM, and Lambda authorizers. Private APIs can be restricted to a customer's VPC, and AWS WAF can help protect against common web exploits. CloudWatch and X-Ray integrations support logging, metrics, and tracing. Optional managed server-side caching uses selected instance types billed hourly without long-term commitments. AWS lists compliance with SOC, PCI, HIPAA/HIPAA BAA, IRAP, C5, ENS High, OSPAR, and HITRUST CSF programs, while noting that customer responsibilities depend on data sensitivity, objectives, and applicable rules. Pricing starts at $4 a month for AppSync GraphQL; usage and optional services can add charges.

Who it suits

It suits developers building GraphQL or real-time applications, federated APIs, or AI gateways. Teams should consider usage-based charges and their own compliance responsibilities.

Limits

AppSync GraphQL lists 250,000 query or data modification operations, 250,000 real-time updates, and 600,000 connection-minutes in the Free Tier. Its listed paid plan is $4.00 per month per million Query and Data Modification Operations, with additional charges for real-time updates, connection minutes, data transfer, and optional caching. AppSync Events is $1.00 per month per million Event API operations and $0.08 per million connection minutes, with data transfer charged at the EC2 data transfer rate.

Getting started

1. Open the Amazon AppSync website.
2. Choose the AppSync Events or AppSync GraphQL plan.
3. Use the API explorer to work with an API.
4. Generate client code or test operations as needed.
5. Build with JavaScript or VTL server languages.

Verdict

AppSync provides GraphQL and pub/sub APIs with integrations for data sources, authorization, and observability. The free tier and paid usage pricing differ by service, so account for operations, connections, data transfer, and optional caching.