Does Genymotion allow access to unlimited devices or only one device?

It depends on the plan. Some plans are limited, while Unlimited, Premium, and Enterprise options provide access to multiple virtual devices, with the exact number based on what you purchase or your contract. Pricing says Pay-As-You-Go is limited to 2 concurrent instances, and the Unlimited plan lets your organization start the number of simultaneous devices included in the subscription.

• Pay-As-You-Go: up to 2 concurrent instances.
• Unlimited: 24/7 access to the number of virtual devices included in the plan.
• Premium: customizable, including unlimited usage.
• Master Agreement for Enterprise: unlimited access to all Genymotion products and supported instances.