The Ariane Passenger PayLoad Experiment (APPLE), was an experimental communication satellite with a C-Band transponder launched by the Indian Space Research Organisation on June 19, 1981, by Ariane, a launch vehicle of the European Space Agency (ESA) from Centre Spatial Guyanais near Kourou in French Guiana.

The 672 kg[1] satellite served as testbed of the Indian telecommunications space relay infrastructure despite the failure of one solar panel to deploy.

Solid-propellant based Apogee Boost Motor to circularize APPLE's orbit was derived from SLV-3 fourth stage.

[2] It was used in several communication experiments including relay of TV programmes and radio networking.

Its payload consisted of two 6/4 GHz transponders connected to a 0.9 m diameter parabolic antenna.