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Modal vs toast 0:40
A 40-second explainer of Modal vs toast, narrated over the same demo you can try yourself.
Try the interactive Modal vs toast demo
What this video covers
A modal blocks interaction with the underlying interface and demands attention; a toast is non-modal, temporary feedback and should not contain essential information.
Confirming a routine save with a modal made you stop and click "OK" for no reason - an interruption tax. The toast did the same job and got out of the way. Flip it for a destructive action, though, and the toast that vanishes is exactly wrong. Match the weight of the interruption to the weight of the moment.