GW190425 was a gravitational wave detected on 25 April 2019 at LIGO-Livingston. Some low signal-to-noise data from the Virgo interferometer could not be used for detection but was used for parameter estimation. In contrast to GW170817, LIGO-Hanford was offline and did not observe GW190425, and because the Virgo detection was low-confidence, the event is not well-localized in the sky — the 90% confidence zone spans 8284 deg2, while GW170817 was localized to 28 deg2 before its optical counterpart was identified.