Onshape vs Seamless3d

Onshape is a browser-accessible 3D CAD platform for parametric modeling of solids, surfaces and sheet metal, with iOS and Android apps also available. It supports assembly design, rendering, simulation, CAM and 3D-print export. Simulation covers linear static and modal analysis for stress, deformation and natural frequencies; CAM supports machining from 2.5-axis through 5-axis machines. Collaboration includes multi-user editing, instant sharing, real-time communication and access controls. Built-in product data management includes edit history, version control, release management, search and design-data sharing. The Free Plan is for non-commercial use, with publicly accessible documents and unlimited public storage. Standard costs $1,500/user/yr; Professional costs $2,500 per year. Qualified professionals may be eligible for a Professional trial of up to six months without a credit card. Enterprise uses custom pricing. Onshape says updates arrive every three weeks without installations or downtime. Listed integrations include Slack, Arena PLM, Altium Designer, FeatureScript, REST API and the App Store.

Seamless3d has no write-up on Specifiction yet; its figures are above.