AWS Transform MGN (formerly AWS Application Migration Service) vs Device42

AWS Transform MGN automates rehosting physical, virtual, and cloud servers as native Amazon EC2 instances. It continuously replicates source-server data at the block level, converts servers for AWS, and coordinates cutover with minimal downtime. Teams can use an agentic AWS Transform workflow or manage migration steps in the MGN console, switching paths without losing progress. Sources include physical servers, VMware vSphere, Microsoft Hyper-V, other on-premises infrastructure, public clouds, and migrations across AWS Regions, Availability Zones, or accounts. After launch, built-in or custom actions can configure disaster recovery, upgrade operating systems, convert licenses, or install CloudWatch Agent. Servers can be organized into applications and waves for launch, cutover, archival, and configuration operations. MGN supports x86 sources and replication volumes up to 16 TB; larger volumes are not supported. A 90-day free period covers 2,160 hours per source server when used continuously. AWS infrastructure for replication, testing, or cutover is charged separately, and continued replication is charged per hour after the free period.

Device42 provides agentless discovery, asset management, and dependency mapping for data center, cloud, and hybrid IT environments. Its scope includes CMDB, DCIM, ITAM, IPAM, password management, and application dependency mapping, in a self-hosted deployment. It can discover network devices through SNMP and cloud resources across AWS, Azure, Google Cloud, Oracle Cloud, and OpenStack.

For data centers, its visual models cover buildings, rooms, racks, cabling, and patch panels, with power and temperature heat maps. Core includes discovery, inventory and asset management, integrations, REST APIs and webhooks, warranty and SSL certificate management, cable and password management, and IPAM. Device42 also tracks software licenses, contracts, and barcodes, and lists more than 30 integrations. Licenses count devices with IP addresses; non-IP assets do not count, and user seats are unlimited. If the device limit is exceeded, the software keeps running but stops collecting additional information until the license is increased. Pricing is available on request, and a free trial is offered.