Online investment management service Betterment LLC will acquire ImpulseSave, a startup that designs software meant to encourage people to save.

Existing ImpulseSave customers are able to use the service until Nov. 1.

To incentivize conversion, Betterment is offering free use of the app for three months.

ImpulseSave created a mobile app, among other things, to tempt people to save versus spend.

Several months ago, ImpulseSave removed the need to open accounts with its bank partner Leader Bank in order to use its services.

Other software offerings designed to incentivize savings have been updated in recent weeks. Social Money, for example, opened an API to allow third parties to integrate goal-based savings accounts into their digital offering while SaveUp released its first native app in October.