How the Berliner Festspiele Increased Their Newsletter Sign-Ups by Almost 90%

Almost 90% more sign-ups per month and a double opt-in rate of 85%.

• Monthly new sign-ups: +90%
• Double opt-in rate: 85% (previously approx. 75%)
• Multiple sign-ups: over 80%
• Weekly growth: approx. 450 subscribers

Interested people should be able to sign up easily for up to four newsletters at once. Depending on the selection, it had to be documented in a legally compliant way for which channel consent exists. Classic forms often set attributes right before the double opt-in click, which is risky under data protection law.

• Confusing newsletter offering across several channels and venues
• Rigid double opt-in campaigns with no connection to the topics chosen
• High hurdles for GDPR-compliant documentation of individual consents
• No self-service options for managing interests

With the E-Marketing Suite, starmate implemented a privacy-compliant solution:

• Address and profile management: A central form allows free combination of all four newsletter channels.
• Campaign automation: The form triggers a double opt-in event and passes the selected newsletter attributes in encrypted form to a dynamic placeholder in the confirmation link.
• Email marketing: Only when the confirmation link is clicked are the attributes set in the profile. This ensures seamless documentation.
• Preference center: Recipients adjust their interests themselves at any time.

By removing technical barriers, sign-up numbers rose significantly, while administrative effort fell thanks to automated documentation.

• Almost 90% more monthly newsletter sign-ups
• Double opt-in rate of 85% (previously approx. 75%)
• Over 80% multiple subscriptions

“starmate understood that data protection and usability don't have to be opposites. The new, dynamic sign-up makes it effortless for our guests to subscribe to exactly the cultural news that interests them, and for us everything is documented in a legally compliant way.”

Johannes Becker, Head of Digital Marketing & CRM, Berliner Festspiele

The challenge lay at the intersection of good user experience and strict data protection. With the dynamic double opt-in logic, a single form is enough for four channels.

Consent is only recorded in a legally compliant way, for exactly the chosen topics, at the moment of the click. The fact that sign-ups rose by almost 90% shows that people subscribe to relevant content when you make it simple and transparent.

Chris, Consulting

1. Concept & tracking architecture: Definition of the GDPR requirements and the dynamic event logic.
2. Development of the EMS placeholders: Programming the link generation to store the interest IDs.
3. Form design & testing: Responsive form with a clear UX focus and tests of the double opt-in scenarios.
4. Rollout & integration: Go-live on the websites of the Berliner Festspiele and the Gropius Bau.
5. Monitoring & performance tuning: Analysis of click rates and ongoing optimization of the preference center.