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A comment on Charging cars at home at night is not the way to go: study. Parent comment
Found these examples by quickly googling:
https://www.trueenergy.io/app/
https://play.google.com/store/apps/details?id=com.sense.andr...
https://play.google.com/store/apps/details?id=com.tibber.and...
EDIT: to answer the question: yes, these apps use something called "Nord Pool" which publishes hourly electricity prices (in Swedish): https://elavtal24.com/blogg/tibber-greenely/
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Found these examples by quickly googling:
https://www.trueenergy.io/app/
https://play.google.com/store/apps/details?id=com.sense.andr...
https://play.google.com/store/apps/details?id=com.tibber.and...
EDIT: to answer the question: yes, these apps use something called "Nord Pool" which publishes hourly electricity prices (in Swedish): https://elavtal24.com/blogg/tibber-greenely/