1. Supported Platforms: OpenSSL is a widely-supported open-source cryptographic toolkit that can be used on various platforms such as Windows, Linux, macOS, and more. In contrast, Sonicwall is a security appliance that is typically used as a hardware firewall solution for network security in enterprises, making it more restricted in terms of platform support.

2. Functionality: OpenSSL primarily focuses on providing cryptographic functions, SSL/TLS protocols, and certificate management for secure communications. On the other hand, Sonicwall offers a comprehensive set of security features such as intrusion prevention, malware protection, content filtering, and VPN services, making it a versatile security solution beyond just encryption.

3. Licensing: OpenSSL is distributed under an open-source license, allowing users to freely use, modify, and distribute the software. Sonicwall, on the other hand, is a proprietary technology with licensing fees, which may require additional costs for deployment and maintenance.

4. Scalability: OpenSSL is scalable and can be integrated into various applications and systems, providing flexibility in customization and deployment. Sonicwall, as a hardware appliance, has limitations in scalability and may require additional devices for expanding security coverage in a network environment.

5. Community Support: OpenSSL benefits from a large community of developers and contributors who continuously update and improve the software, ensuring timely security patches and enhancements. In contrast, Sonicwall relies on vendor support for updates and maintenance, which may not always be as robust as open-source community support.

In Summary, the key differences between OpenSSL and Sonicwall lie in their platform support, functionality, licensing, scalability, and community support, highlighting the distinct features and limitations of these technologies.