MyWay users will only pay a $2 fare to go anywhere in Hastings under the trial, and people will not have to wait more than 25 minutes from booking to being picked up.
Buses will pick up and drop off customers within 200m of the travel source and destination.
The MyWay service will replace routes 16A, 16B and 17 in urban Hastings and operate Monday to Friday, 6am to 6pm. Customers can request a vehicle through the MyWay app or call the regional council.
Councillor Williams said getting more people out of cars in Hawke's Bay through "mode shift" is something the regional council takes seriously.
The HRC wants more people to use buses, ride bikes, or walk, mainly to make shorter everyday trips around town - helping environmentally and improving health and wellbeing.
"MyWay is our first step on the journey to change the way we think about and use public transport in Hawke's Bay," Williams said.
Regional council group manager policy and regulation Katrina Brunton said, "We've worked hard to meet the needs of our local community and provide flexibility and connection across Hastings."
Brunton explained MyWay uses technology to match customers travelling in the same direction and works out a flexible route to pick them up and drop them off close to their destination.
When using the app, they can track the vehicle and get updates on when they will arrive.
"Ahead of the service launching on June 7, the HRC is asking for people from across the community to trial the service for two weeks to iron out any issues and give us time to make changes before it opens to the wider public," Brunton said.
The HRC hopes to implement the same service in Napier next year.
To sign up to trial the service for free and get a $25 Bee Card top-up, or for more information on the service, head to mywayhb.nz.