Android Apps

• Amazon Kindle. Price: Free (books cost money)
• Coursera. Price: Free / Varies.
• Duolingo. Price: Free with optional in-app purchases.
• Khan Academy. Price: Free.
• LinkedIn Learning. Price: Free.
• Photomath. Price: Free.
• SoloLearn. Price: Free.
• Udacity. Price: Free / Varies.