The JustGrab Green pilot initiative and Green Programme will offer consumers convenient ways to reduce their emissions.
All ComfortDelGro cabbies will be removed from ride-hailing app Grab's JustGrab platform, which offers flat fares to commuters.
Grab has announced that the GrabShare option - which allows commuters to share a private-hire car - will now include taxis, with effect from 16th May.
ComfortDelGro's flat fare option, which was launched yesterday, has already received 2,000 bookings; and the firm expects the volume to grow further.
The newly launched dynamic pricing fare option called JustGrab tended to be cheaper than Grab's own private-hire car service GrabCar.
'Dynamic pricing', as used by GrabCar and Uber, means private-hire cars are generally cheaper than taxis during off-peak hours and after midnight.
Surge pricing adopted by private-hire apps has drawn flak from some commuters, after fares rocketed during periods of exceptionally high demand.
The fares, which will range from a few dollars to $100, are quoted upfront and could be lower or higher than standard metered rates; depending on demand.
Grab will be rolling out a new taxi service - JustGrab - which will provide fixed upfront fares when booking a taxi but will also be subject to surge pricing.