With a fresh $12 million in the bank, San Francisco startup URX is hoping to solve a problem bedeviling smartphone users and app developers: links that work inside apps, where smartphone users spend most of their time.

The company specializing in “deep linking” technology has now raised a total of $15 million. The latest round was led by Accel Partners and values URX around $40 million according to CEO John Milinovich. Accel was joined by Google Ventures, SV Angel, and First Round Capital in the financing. Rich Wong of Accel is joining URX’s board.