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Instant insights for authors: book ideas, titles, and keywords. → Real competitor sales data for authors → See what books are really selling → Find the most profitable niches and keywords ReaderRadar is a market intelligence tool for authors. It analyses real marketplace activity to show how strong reader demand is for any book topic, compared to the competition. Instead of guessing what might work, you can now see what is working. ReaderRadar reveals: - How many orders your competitors are getting - How crowded a niche really is - Where genuine reader demand exists - Whether a book idea is commercially strong or weak Every search generates a ReaderRadar Score out of 5, giving you an instant, easy-to-read signal of market strength. You can use ReaderRadar at every stage of publishing: - Validating book ideas - Choosing profitable niches and topics - Crafting stronger titles and subtitles - Selecting better keywords and categories - Optimizing your book listing - Improving A+ content - Building higher-performing ads This is the same type of data-driven analysis used by top publishers and professional marketers, now available to independent authors. ReaderRadar uses publicly available marketplace data to generate relative demand scores. All figures are estimates based on real-world activity and are designed to show comparative market strength, not exact sales numbers. If you want to publish with confidence instead of hope, this is your edge.
Jan 28, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.