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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.

30%
Open rate, up from 12%
200k
Subscribers migrated and cleaned
3.7%
Click-through rate
2x
Weekly sends, incl. a weekend edition

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.

A tired list at 12% opens, rebuilt into a channel at nearly 30%.

Four moves that turned a stale list into a channel

Migrate the list
Moved Apidays from Mailjet to beehiiv, our agency partner, without harming deliverability.
01
Clean for deliverability
Pruned a list of nearly 200,000, removing inactive contacts so every send lands in the inbox.
02
Elevate the content
Added thought-leadership interviews with key API voices and a weekend edition, two sends a week.
03
Protect the list
Automated re-engagement for anyone inactive 6 to 8 weeks, then removed them to keep the list healthy.
04

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.

01
Open rate 12% to 30%
More than doubled
Rebuilt content and cadence lifted opens from 12% to just under 30% on a list of nearly 200,000.
02
Deliverability restored
Mailjet → beehiiv
Migrated and cleaned the list, then automated re-engagement so sends reliably reach the inbox.
03
Thought leadership
Interviews with API voices
Positioned Apidays as a thought leader with interviews of key voices across the API space.
04
Year-round engagement
Beyond event season
Attendees who show up for one event a year now engage with Apidays all year through the newsletter.

Your audience is waiting. Let's go build it.

Every newsletter we've built started with one conversation. If you're serious about owned media, that's where we start too.