
How Spacebar Studios took Apidays from a 12% to a 30% open rate
Apidays runs 10+ global API conferences a year, with a large list of past attendees that had gone quiet at a 12% open rate. That is where we stepped in, taking their newsletter off their plate end to end. We migrated their list to beehiiv, cleaned it for deliverability, and rebuilt the content, more than doubling open rates.
A huge attendee list, stuck at a 12% open rate.
Apidays is a global API conference series, 12+ years running, with 10+ events a year from London to New York to Australia. They had a large list built from past attendees, but engagement had fallen to 12% on their old ESP, Mailjet.
The list was going stale and deliverability was slipping. Apidays needed a partner to own the newsletter end to end, clean up the list, and turn it back into a channel that keeps attendees engaged all year, not just at event time.

Four moves that turned a stale list into a channel
One newsletter. Four outcomes.
In a few months we more than doubled open rates on a list of nearly 200,000, turning a quiet list into a year-round engagement channel.

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