The Apptentive team. Photos via Apptentive.

Apptentive has a new investor and more cash to help fuel its growth.

Apptentive CEO Robi Ganguly.

The Seattle startup, which helps mobile app makers retain customers and boost reviews, has reeled in an additional $1.7 million, which extends a “Series A-2” round up to $5.3 million.

The first $3.6 million of the “Series A-2” round came in this past November and included investors like Origin Ventures; SurveyMonkey; Vulcan Capital; and Blossom Street Ventures.

Phoenix-based venture capital firm Grayhawk Capital is the new investor that participated in the “Series A-2” round.

Total funding for the 5-year-old company is now $12 million. The new cash will be use to hire more employees; Apptentive CEO Ganguly told GeekWire in November that the startup planned to go from 30 employees to 55 more more in 2017.

Apptentive’s SDK helps clients like Nordstrom, eBay, Zillow, Microsoft, Sonic, Major League Soccer, IHG, Viacom, power in-app surveys and rating/review prompts. The company, which graduated from Techstars Seattle in 2012, says it powers more than 25 million in-app customers interactions each month.

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