Any LinkedIn account works with Extrovert. Sales Navigator is useful for finding prospects but not required.
☝️ Pro tip: Sales Navigator or Premium gives you higher daily activity limits, so you can do more commenting without hitting restrictions, so it's recommended to have it.
When Sales Navigator helps
Sales Navigator is great for prospecting before you use Extrovert:
Advanced search filters to find ideal prospects
"Posted on LinkedIn" filter to find active posters
Higher daily limits if you use other LinkedIn tools
Without Sales Navigator
You can still find prospects using:
Regular LinkedIn search
Your existing connections
CRM contact lists
Event attendee lists
Other prospecting tools