Prepare for standardized tests with engaging vocabulary challenges. This app offers multiple-choice questions, adaptive learning, and spaced repetition to help you master over 3,000 words. Track your progress, compete on leaderboards, and enjoy a focused learning experience.
1.4.1
May 22, 2026
Bug fixes
Get premium access with a monthly subscription.
ThirtyB uses adaptive learning and spaced repetition to help users master vocabulary. It presents synonym-based multiple-choice questions modeled after U.S. standardized tests, providing instant feedback to reinforce learning.
ThirtyB offers analytics and progress tracking features. Users can earn points, climb leaderboards, and monitor their mastery of over 3,000 words, providing a clear view of their learning journey.
ThirtyB offers a Monthly Premium Plan for $5.99 per month and a Yearly Premium Plan for $59.99 per year, providing access to enhanced features and content.
Yes, ThirtyB is rated for ages 4 and up, making it suitable for a wide range of students. Its engaging format and gamified elements can appeal to younger learners preparing for tests.
The latest version of ThirtyB is 1.3, and it was last updated on February 25, 2026. This indicates a recent update, suggesting ongoing development and support for the application.
No, ThirtyB does not contain advertisements. The app is free to download and use, with optional in-app purchases for premium features.
ThirtyB is available on iPhones and iPads, offering a consistent learning experience across Apple mobile devices.
ThirtyB differentiates itself by directly mimicking U.S. standardized test formats and incorporating unique features like handwriting-powered bonus boosters and social accountability, in addition to adaptive learning.