Unfortunately, Akindi doesn't have a feature that will allow you to curve the test results. That being said, you can simulate a curve using our 'bonus' question feature, which will reduce the denominator by a point, but still reward the students that answered the question correctly.
You can make a questions a Bonus Question, by double clicking on the question in the "Responses" tab, selecting the "Bonus" checkbox and clicking "Okay" then "Save Changes". The sheets will automatically regrade the test sheets agains the updated answer key.
GIF: Double Click Answer Key > Select Bonus Question > Ok > Save Changes