One of the 39 Melachos of Shabbos is lighting a fire or adding fuel to an already existing flame. A closely related issue is [[Electricity on Shabbat]]. Regarding the Shabbos App, see [[The Shabbos App]] section.
# The Melacha of [[Mavir]] includes kindling a fire, adding fuel to a fire, or spreading a fire.<ref>39 Melachos (Rabbi Ribiat, vol 4, p. 1197). See Gemara Krisos 20a, Beitzah 22a, Shabbos 120b about opening a door for the wind to enhance a torch or flame.</ref>