At any time, you may upgrade or downgrade your current subscription to any plan.
When you upgrade your subscription, prorated charges are applied based on the remaining time in the billing period for both the original and new subscription.
For example, if you upgrade from the Pay-as-you-go plan, which costs $450 per year, to the Essential plan, which costs $948 per year, halfway through the billing cycle, the prorated charge would be $249.
This means that you would need to pay an additional $249 to upgrade from the Pay-as-you-go plan to the Essential plan halfway through the billing period.
Upgrading from the Pay-as-you-go, Essential, or Advanced plans will not give you any additional free credits since these plans already offer the same amount of free testing credits as part of their package.
A subscription can be downgraded at no extra cost, but there will be no refund provided.
