The best replacement for drum machine is metronome.

The best alternatives to drum machine are rated as following:
★★★★★  metronome
★★★★  sampler
★★★  midi keyboard
★★★  mpc
★★  real drums
★★  sequencer
★  drummer

Your alternative for drum machine is not listed? Suggest!
Speaking about drum machine, one probably shouldn't forget about sampler.

Other search terms related to drum machine and their ratings are:
★★★★★ sampler
★★★ synth
★★ looper
★ built in guitar effects
You have in mind a companion for drum machine and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of drum machine in all years. Click on graph for more.
drum machine
metronome
sampler