Based on your query, I recommend Gradescope as a suitable tool for creating rubrics.

The Dynamic Point Adjustment Rubric feature allows you to change grading criteria even while grading, providing flexibility and adaptability to your assessment process. This feature can be particularly useful if you need to adjust your rubric based on the students' performance or if you realize mid-way that a certain criterion needs to be modified.

Moreover, Gradescope integrates well with learning systems like Canvas and Brightspace, making it easy to add class rosters and push grades to these systems. This can streamline your grading process and ensure that all student data is in one place.

Lastly, Gradescope offers a free basic plan that includes dynamic rubrics, basic assignment types, statistics, and a student mobile app. This makes it a cost-effective solution for your rubric creation needs.