Satmetrix Systems, a Foster City, Calif. company that provides a customer loyalty service software, has acquired Informative, a South San Francisco online customer loyalty company, according to PE Wire.

No financial terms were disclosed. Satmetrix has raised around $30 million in VC funding from firms like Aspen Ventures, Sutter Hill Ventures, Stanford University and Siebel Systems.

Informative had raised around $75 million from firms like New Enterprise Associates, Walden International, Apex Venture Partners, Sevin Rosen Funds, Crystal Internet Venture Fund, BlueRun Ventures, Levensohn Venture Partners and global Catalyst Partners.