SG GO

SG GO is a Singapore public transport journey planner in OFFLINE mode. No matter you at which bus stop or train station, SG GO will lead you to your destination. Public transport supported: SMRT/SBS Bus, MRT, LRT and Monorail to Sentosa.

SG GO app is the only OFFLINE journey planner in the market now, i don't think you can get another one. :D
Try compare to other apps, you will notice SG GO app provide more transit results. 

Features:
» Offline Journey Planner, able to filter by MRT, LRT, Bus and Irregular Hours Bus Services.
» Each journey can has up to 4 changes of public transport.
» Location Search with Google Map or Offline Data.
» bus stops nearby & routes show on map
» Google Map Street View implemented
» History of previous search and used locations.
» Bookmark Location
» Journey Plans display in list view or map view.
» Landscape view with fullscreen map

Notes: Long distance BUS journey may take more than 10 seconds to process data, please be patient.
Tips: Filter transport type may speed up the process time.
If no result found, try move your starting point/destination marker to nearby bus stop/stations.