K Kyrios Learning

Our Portfolio

Content brands we operate

Our portfolio includes owned digital properties across education, reference, publishing, newsletters, and utility content. Each asset is operated with a focus on durable traffic, useful content, and long-term value creation.

World Population Review logo

Education

World Population Review

worldpopulationreview.com

World Population Review makes demographic data more accessible through graphs, charts, analysis, and visualizations instead of hidden spreadsheets, complex APIs, or cumbersome tools.

5M /mo visitors

100K+ articles

2013 launched

Grade Calculator

Education

Grade Calculator

gradecalculator.com

Grade Calculator helps students quickly calculate current grades, final exam requirements, and class performance.

250K /mo visitors

2023 acquired

GladiusTest Academy

Test Prep/Education

GladiusTest Academy

Amazon Storefront

Test prep books for Florida and New York state elementary and middle school assessments.

70 titles

2026 acquired

Unicorn Books

Logic Puzzle Books

Unicorn Books

Amazon Storefront

A KDP publishing property focused on logic puzzle books for readers who enjoy structured challenges and brain-training activities.

64 titles

2026 acquired

WPR Newsletter

Newsletter

WPR Newsletter

wpr-newsletter.beehiiv.com

A daily newsletter from World Population Review delivering accessible demographic insights, data stories, and population trends.

150K subscribers

Daily sends

2024 launched

Closest Airports To

Travel Tools

Closest Airports To

closestairportsto.com

A travel utility site that helps users find the closest airports to cities, towns, and destinations.

3.5K /mo visitors

2025 launched

Interested in selling your content business?

We evaluate established websites, newsletters, and digital publishing assets with clear audiences and sustainable revenue potential.

Sell Your Site