The honest answer depends on one number: your list size. Here's the actual math.

Cost at typical solopreneur list sizes

SubscribersSysteme.ioGetResponse
0–1,000Free plan~$19/mo
~5,000~$47/mo~$54/mo
~10,000~$67/mo~$79/mo

Where they differ

Systeme.io bundles funnels, courses, and memberships. You could realistically run your entire business on it alone.

GetResponse has deeper email automation — better deliverability tooling, conversion funnels tied to email behavior, webinar hosting.

The decision rule

Either way, don't run both. Pick the one matching your bottleneck and revisit in six months.