Case Study: Tumblr

Tumblr Drives Significant Monetization Gains After Migrating to Nimbus Full-Stack Mediation

Tumblr mobile app interface
42%
Combined Revenue Lift Average across iOS & Android
87%
rCPM Lift Average across iOS & Android

Tumblr is one of the internet's most recognizable platforms for creators, fandoms, and culture-driven communities. With highly engaged audiences across its mobile apps on iOS and Android, Tumblr's monetization strategy needs to support both scale and user experience while unlocking more demand without operational complexity.

Challenge

Tumblr was previously leveraging Nimbus as a layered auction within an existing mediation stack. While this approach introduced incremental demand, it inherently limited:

  • Auction transparency and control
  • Holistic demand competition
  • Operational efficiency across partners
  • Full access to Nimbus demand ecosystem

Like many scaled publishers, Tumblr faced a structural constraint:

For a platform of Tumblr's scale, where diverse content and engaged user sessions create meaningful monetization opportunities on mobile, that limitation made it harder to fully capitalize on available demand.

Solution

Tumblr migrated to Nimbus as its full-stack mediation platform, replacing the layered architecture with a unified auction environment.

This transition enabled:

  • Full demand competition across all partners
  • Streamlined integrations (no deep custom partner work required)
  • Real-time reporting and buyer-level visibility
  • Centralized control over auction dynamics
  • True and accurate representation of the auction deliverables in the post-back to demand.

By moving to full-stack mediation, Tumblr was able to better align its monetization infrastructure with the scale and complexity of its product: a global platform where creators and communities across iOS and Android generate continuous, high-value engagement.

"Moving to full-stack mediation helped us better align our monetization infrastructure with the scale and complexity of Tumblr's mobile experience — and the results have been significant."

Julia Wilson Tumblr

The Results (Post-Migration vs Legacy)

iOS Performance

Mobile app

Metric
rCPM
87
Metric
Revenue
59
Metric
eCPM
43

Android Performance

Mobile app

Metric
rCPM
54
Metric
Revenue
25
Metric
eCPM
4

"We quickly unlocked incremental demand without needing deep partner integrations, and the reporting pipelines were easy to set up."

Carolina Wagner Tumblr

Structural improvements:

The performance uplift was driven by three factors

  1. Unified Auction Dynamics

    • Eliminated fragmentation between layers
    • Increased bid density and competition

  2. Expanded Demand access without friction

    • Incremental demand unlocked without deep integrations
    • Faster time-to-value for new partners

  3. Operational clarity

    • Centralized reporting and optimization
    • Reduced auction waste
    • Accurately communicated W/L URL in the bidstream for all partner participants.