Social travel guide tripwolf has released an updated iPhone app that ramps up the company’s freemium offering with the introduction of in-app purchases for destinations where tripwolf has more in-depth information.

The premium content is garnered from the startup’s existing partnerships with travel guide publishers, which is supplemented with user-generated content from the tripwolf community. Additionally, the iPhone app offers a bunch interactive features, including photo-uploads, the ability to vote for locations, write reviews, search for points of interest, and add new locations or places to the tripwolf travel guides.