sparknotes.com 的前十大競爭對手

litcharts.com

from the creators of sparknotes, something better. understand more, faster. free!

gradesaver.com

gradesaver offers study guides, application and school paper editing services, literature essays, college application essays and writing help.

shmoop.com

the cozy home of your favorite free study guides and the most helpful study tools around! check out our new digs and get the help you need!

enotes.com

enotes.com has study guides, lesson plans, quizzes with a vibrant community of knowledgeable teachers and students to help you with almost any subject.

bookrags.com

This detailed study guide includes chapter summaries and analysis, important themes, significant quotes, and more - everything you need to ace your essay or test on The Black Flower: A Novel of the Civil War!

study.com

Take online courses on Study.com that are fun and engaging. Pass exams to earn real college credit. Research schools and degrees to further your education.

khanacademy.org

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

quizlet.com

quizlet makes simple learning tools that let you study anything. start learning today with flashcards, games and learning tools — all for free.