  High Voltage Monolithic Active Pixel Sensors (HV-MAPS) are based on a
commercial High Voltage CMOS process and collect charge by drift inside a
reversely biased diode. HV-MAPS represent a promising technology for future
pixel tracking detectors. Two recent developments are presented. The MuPix has
a continuous readout and is being developed for the Mu3e experiment whereas the
ATLASPix is being developed for LHC applications with a triggered readout. Both
variants have a fully monolithic design including state machines, clock
circuitries and serial drivers. Several prototypes and design variants were
characterised in the lab and in testbeam campaigns to measure efficiencies,
noise, time resolution and radiation tolerance. Results from recent MuPix and
ATLASPix prototypes are presented and prospects for future improvements are
discussed.
