Is there a particular reason you need a boost? Are you having problems with your output level? Is the level too low that you need a boost?
That said, there are some bass pedals that come with EQ controls/Overdrive functions. SansAmp BDDDI, MXR, Sadowsky HBE etc...
Do note that each time you boost a signal, you have lesser headroom.
If you need a clean boost, can try the rc bass booster. Tho, to be honest, i have no idea if there's any difference between the 2 other than the gain knob... never tried one b4