Rankings
Top Book apps on the United States App Store
The 100 most successful Book apps MRRBeam tracks on the United States App Store, as of Oct 8, 2026, ranked by Success score: rating volume, chart position and average rating, all observed from public App Store data. #1 is Amazon Kindle: Reading App by AMZN Mobile LLC (4.9★ from 5,867,885 ratings), followed by Audible: Audiobooks & Podcasts and Libby, the library app.
How this ranking works
The Success score measures how established an app already is. It is different from MRRBeam's Opportunity Score, which asks whether there is room for a new app to compete.
- Traction (50%): number of App Store ratings, on a log scale.
- Chart position (30%): best current position on the overall or category top charts.
- Satisfaction (20%): average rating, shrunk toward 3.8★ when an app has few ratings.
Read the full methodology, or open any app for its ratings, pricing, complaints and opportunity analysis.
Questions about this ranking
- What is the most successful Book app on the United States App Store?
- Amazon Kindle: Reading App by AMZN Mobile LLC leads MRRBeam's ranking with a success score of 69/100 (4.9★ from 5,867,885 ratings), followed by Audible: Audiobooks & Podcasts and Libby, the library app.
- Which top Book app has the best rating?
- Among ranked Book apps with at least 1,000 ratings, Twenty-Four Hours a Day has the highest average: 4.9 stars from 28,698 ratings.
- How is this ranking calculated?
- Each app gets a Success score from 0 to 100: 50% rating volume (log scale), 30% best top-chart position (overall or category) and 20% average rating, adjusted so apps with few ratings cannot outrank well-loved ones. Every input is observed from public App Store data; no revenue or download estimates are used.
- How often is it updated?
- MRRBeam reads the App Store top charts every day and re-reads the best-charting tracked apps daily; the rest of the catalog is re-read in a rotation of 100 apps a day. Every app page shows the date its data was observed.