| SOAP vs REST Web Service | SOAP | REST |
| Meaning | Simple Object Access Protocol | Representational State Transfer |
| Design | Standard protocol with predefined rules to follow | Architectural style with loose recommendation and guidelines |
| Approach | Function-driven | Data-driven |
| Statefulness | Stateless by default but a SOAP API can be made stateful | Stateless in nature, no server-side sessions |
| Caching | API calls are not cached | API calls are cached |
| Security | WS-Security with SSL support. Provides an inbuilt ACID compliance | Supports SSL and HTTPS |
| Performance | Requires more power, resources, and bandwidth. | Requires fewer resources |
| Messaging format | Only XML | XML, JSON, plain text, YAML, HTML and others |
| Transfer protocols | SMTP, HTTP, UDP, and others | Only HTTP |
| Nature | Heavyweight | Lightweight |
| Recommended for | Financial services, enterprise level apps, payment gateways, high-security apps, telecommunication services. | Public APIs for web services, social networks, and mobile services. |
| Advantages | Standardization, security, extensibility | High Performance, Scalability, Flexibility and browser friendliness |
| Disadvantages | More complex, poor performance, less flexibility | Unsuitable for distributed environments, less security |
| Coupling | TIghtly Coupled | Loosely coupled |