Looking for a full, structured algebra course online? Here's a comparison of the top curriculum providers.

1. Khan Academy: The Free Champion. It's a complete, mastery-based curriculum. The price ($0) is unbeatable, but it lacks instructor support.

2. IXL Math: The Practice Powerhouse. It's fantastic for drilling skills with endless problems and great analytics, but can be light on initial instruction.

3. Teaching Textbooks: The Gentle Guide. Known for its friendly, audio-visual approach and automated grading. Great for students who need a lot of support.

4. Art of Problem Solving (AoPS): The Rigorous Challenger. This is for the highly gifted and motivated student who wants a deep, challenging experience.

5. CTCMath: The Flexible Tutor. It uses short, clear videos and allows students to move at their own pace. Great for a wide range of learners.

The best choice depends entirely on your student's needs.

Do they need a challenge (AoPS) or gentle support (Teaching Textbooks)?

Do you need a full curriculum (CTCMath) or a free supplement (Khan Academy)?

Research each one, watch their sample videos, and choose the system that best fits your philosophy and your student's learning style.