Case Studies 5 min Dec 22, 2025

How StreamLine boosted revenue with smart upsells

StreamLine, a SaaS company offering project management software, had a loyal base of small-business clients. Many of them were happy with the basic plan — but that also meant revenue growth was flattening. The sales team knew that features like advanced analytics and integrations were valuable, yet few customers upgraded on their own.

Emails weren’t moving the needle

Upgrade offers sent by email went mostly unnoticed. Manually calling satisfied clients to pitch upgrades would have taken weeks of sales reps’ time, pulling them away from new business.

How things changed with Callo

Callo didn’t try to “hard sell”. Instead, the voice agent reached out to customers who were already satisfied with StreamLine’s software and offered a simple upgrade in a natural, friendly way:
— Hi Alex, I see you’ve been using StreamLine for a year. Did you know you can unlock advanced reporting for your whole team with just a small upgrade?
If clients were interested, they could confirm right away, if not, Callo simply tagged them for a later follow-up. This way customers felt they were being offered more value, not being “sold to”.

Callo helped us turn simple check-in calls into $180K of extra revenue

Daniel Thompson, customer success director at StreamLine

The payoff

  • 2036 customers contacted in just three days
  • 654 upgrade conversations started (30% response rate)
  • $180 000 in additional ARR generated from upsells

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