Apparatuses, machine-readable media, and methods related to hazard indicators are described. Determining whether hazards exists and the location of a hazard can be helpful when moving about. Computing devices (e.g., mobile devices and/or cloud-based computers) can be configured to run an application (e.g., a hazard indication tool) to determine that a hazard exists and indicate to a user of a computing device that the hazard exists according to examples of the present disclosure. A user can carry a mobile device with them while they are walking or running. The mobile device can include a number of sensors (e.g., image sensors, microphones, infrared (IR) sensors, ultrasonic sensors, location sensors) to generate data that can be used by a hazard indication tool to determine if a hazard exists. The hazard indication tool can output a warning that indicates to a user that a hazard exists, an alternate route to avoid the hazard, and/or generate a hazard library that other users can use to obtain information about hazards.