Based on your search query, I would recommend Gradescope for your needs. This tool is particularly useful for grading assignments and exams, and it offers a dynamic point adjustment rubric that allows you to change grading criteria even while grading. This feature can be very beneficial if you need to adjust your grading system based on the performance or understanding of your students.

Moreover, Gradescope provides detailed analytics on student performance, which can help you identify areas where your students might be struggling and need additional support or resources. This tool also integrates well with learning systems like Canvas and Brightspace, making it easy to add class rosters and push grades to these systems.

One of the standout features of Gradescope is its AI-Assisted Grading. This feature uses artificial intelligence to help grade written exams and homework, which can save you a significant amount of time and ensure consistency in grading.

In summary, Gradescope could be a great fit for your needs due to its:

• Dynamic Point Adjustment Rubric: Allows for on-the-fly changes to rubric items and values during grading.
• Integration with Learning Systems: Easy sync with Canvas and Brightspace.
• AI-Assisted Grading: Uses artificial intelligence to help grade written exams and homework.
• Detailed Analytics: Provides insights into student performance.

Remember, Gradescope offers a free basic plan that includes dynamic rubrics, basic assignment types, statistics, and a student mobile app.