Edmunds.com
Edmunds.com is perhaps the Web's most-comprehensive auto-information site, and the firm makes virtually all of its content available to on-the-go consumers who download its mobile app.

User-friendly navigation puts pretty much everything you'll ever want to know about hundreds of different car models at your fingertips. There are tons of photos, videos, staff-written reviews, consumer-generated reviews and more.

Stand-out features include Edmunds' True Market Value estimate, a rundown of what buyers in your area pay on average for given models. You can also build and price a car on the fly by clicking buttons to add or subtract options to a model you're interested in.

The biggest drawback: The app doesn't share the Edmunds.com website's ability to compare models side by side.

Kelley Blue Book
Best known as the bible for used-car pricing, Kelley Blue Book offers plenty of information about new vehicles, too.

KBB's mobile app features eight easy-to-scroll-through screens of reviews, photos, fair-value estimates and more for basically any new model you're considering.

The best section is the "Compare" screen, which comes populated with information on a half-dozen or so vehicles that compete directly with whatever car you're researching.

That said, the KBB app does have a few shortcomings, such as the lack of a tool to custom build and price a model with just the options you want.

The app also only lists local dealers who carry the brand you're interested in -- not a rundown of nearby inventories and pricing. That's bad if you're haggling with a dealer and want to show the salesperson what the competitor down the road is offering.

TrueCar.com
TrueCar.com offers a radically different app than other sites, focusing less on researching vehicles and more on connecting buyers who know what they want to local dealers.

"There are a lot of great places where you can research a car, but we feel that when you're ready to buy, TrueCar is the right place to go," company spokesman Mike Cooperman says.

That means the TrueCar app skips things such as car reviews, but includes detailed information about what you should offer to pay for any given vehicle.

For instance, the app not only gives you a TrueCar Price Estimate for a car based on recent sales in your area, but also serves up three actual offers from local dealers. Click the "Lock Savings" button and one or all three will contact you to try to close a deal.

That said, users must register with a valid email to use TrueCar's app. Although the site won't share information with dealers without your OK, many consumers prefer to shop anonymously until later in the car-buying process.

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