An easy way to fine-tune, and adjust parameters for iOS apps in development.
With no code changes and no computer, you can try out different options and decide which works best.
Some of the most useful parameters to adjust are animation timings, velocity thresholds, colors, and physics constants. Facebook also uses tweaks to temporarily disable new features during development. That way, the designers and engineers involved can enable it on just their devices, without getting in the way of others testing the app.