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Agreed, especially since your slider uses a percentage value (what's 100% of speed?). If instead you used a label of 'Precision' like anateus suggested, or a similar word like Accuracy and your end values were 'High' and 'Low' that should make more sense.

2 CSS booboos:

- .main-description has 2 font-sizes, the second should be font-weight.

- in styles.css the images/line.png image returns a 404 on line 26.

nice app, I don't have a mac, but still impressive. btw, small idea: I got the idea of precision vs speed, just format it so that precision is on one end and speed is on the otherone

Or your target audience (artists, designers, CAD?, gamers?) may be familiar enough with DPI that you can just use that.

Good point.