As per our plans and pricing page:
Product roadmap: Every product has a roadmap, so 'a product roadmap' refers to how many products (and roadmaps) you get per plan.
Product managers: These are the users that will have editing rights within the application, whether as an admin (account owner) or editors (non-admins, still have editing rights.)
Integrations: All integrations listed here and here count towards the number of integrations available per plan. This includes any use of our API to create a webhook, but excludes Slack and Zapier integrations, which are completely free.
Team members: Team members refer to the number of reviewers in your account. Reviewers can add and edit their own ideas, but can't edit ideas added by others, change the roadmap, or access any company settings. This is great for your sales or support teams for example, where you still want them to cooperate in be part of conversations without editing key areas of the app. You can find more details on users and permissions here.
Customer Feedback Portal: Gather ideas and feedback from your customers direct from our free customer feedback portal.
For plans Plus and above, you can purchase extra products and product managers as needed for only $10 a month. There is also the option of purchasing extra integrations for $15 per month.
Premium and Unlimited accounts come with premium features such as Product Lines and a Portfolio Roadmap. These options allow you to group and view your products all in one single view, so you can better coordinate across teams.
This also includes the GoogleApps integration, which includes GoogleSSO for your team to log in and GoogleDrive so you can import documents and mockups directly from your team's Google account.
Unlimited accounts also come with Premium Support & Training, which is discussed on a one on one basis.