Today’s apps gone free: Universal Zoom, Track Kit, Sentinel 4 and more

Get a sense of scale, track your routes, and fight off aliens with powerful towers with today’s collection of apps and games.

All app prices are subject to change at any time and without notice regardless of stated free duration. Price changes are solely under the control of the developers.

Universal:

Track Kit – GPS Tracker with offline maps ($2.99 → Free, 37.7 MB): Track and share your routes with Track Kit. It’s perfect for travelers and anyone who likes to wander outdoors.

No matter where you’re traveling, Track Kit will be able to record your entire journey for you. It’s great for hiking, hunting, boating, and even just road tripping. It’s able to record your routes with waypoints, and you can attach notes, audio recordings, and photos to provide context. Track Kit is also loaded with tools to help you measure the distance between points, radius, incline, direction, and speed.

Track Kit – GPS Tracker with offline maps is available for free for a limited time. It has a 4.5-star rating with a total of 28 ratings.

Yelp (Free, 48.2 MB): An always has been, always will be free app from our sponsor! Yelp helps find the best restaurants, businesses, and services in any location. It’s for anyone looking to discover the best place to go eat, get something repaired, or pretty much anything else.

We don’t normally do sponsored apps, but Yelp truly belongs on every iDevice, so we were honored when they wanted to be a part of AppsGoneFree. Just type what business or service you’re looking for into the search field and add your current location or your destination. Yelp will bring back results based on the inputted information along with an average score from those who have utilized the businesses or services, helping you make an informed decision. Yelp also provides additional information like directions, contact information, and pricing.

Yelp is available for free today only (09/26). It has a 4-star rating with a total of 194580 ratings.

Sentinel 4: Dark Star ($2.99 → Free, 315.1 MB): Explore the mystery of the Dark Star and fend off aliens with your powerful towers in the latest installment of the Sentinel series. It’s for fans of the genre who prefer fixed paths over open environments.

The Sentinel series is back and better than ever in this latest installment. Sentinel 4’s campaign is huge, spanning 26 unique maps that will have you fighting back the alien horde with all new towers and units to deploy. Sentinel 4 is also visually superior to previous installments thanks to real-time dynamic lighting and shader effects that bring a whole new level of fun to the experience. Once you’ve completed the campaign, you can go back through each level to see how long you can survive in endless mode.

Sentinel 4: Dark Star is available for free for a limited time. It has a 4-star rating with a total of 58 ratings.

PDF Smart Convert – PDF all your MS Office, iWork, Web Content, Clipboard and Images ($6.99 → Free, 27.4 MB): Turn almost anything into a PDF with this utility app. It’s a very handy app for business professionals who frequently need content in PDF form.

PDF Smart Convert supports more than 200 different file formats, allowing you to create PDFs from just about anything including clipboard content, web pages, photos, iWork documents, and MS Office documents. You’re even able to scan physical documents with your iDevice’s camera and turn them into PDFs. Your newly created PDFs can be managed and stored within folders, or sent off to your favorite cloud service. You’re also able to move files via email, Wi-Fi, or iTunes File Sharing.

PDF Smart Convert – PDF all your MS Office, iWork, Web Content, Clipboard and Images is available for free for a limited time. It has a 4-star rating with a total of 65 ratings.

Universal Zoom: All About Sizes and Distances ($4.99 → Free, 163.8 MB): Get a sense of the scale of the universe with Universal Zoom. It’s one of those apps that’s designed for people with a desire for knowledge no matter their age.

At first glance, Universal Zoom may not look like much. But once you dig in you won’t be able to stop exploring. The app includes more than 200 objects that are presented in high-resolution and completely to scale. Simply swipe in any direction to move through the objects and see how they compare in size to the rest. The scale ranges from Planck Length to 93 billion light years, so there’s a lot to see. You’re also able to choose objects and compare them directly against others.

Universal Zoom: All About Sizes and Distances is available for free for a limited time. It has a 5-star rating with a total of 63 ratings.

That concludes today’s issue of Apps Gone Free. If you like staying on top of these daily deals, don’t forget to check out our free AppsGoneFree app. It provides all the deals each day, and even an archive of past deals that are still active.

Developers:

If you are a developer who would like to get your app included in our “Apps Gone Free” daily lists, here’s our basic set of rules:

It must have at least a three-star average rating at the time it goes free.
The app must not have been free numerous times (3+) over the last six months.
The free version of your app must not include ads.

To submit an app, simply send a request to tyler@appadvice.com with the subject “Apps Gone Free.” Please include the name of the app, a link to it in the App Store, when and for how long you intend to offer the app for free, and anything else you would like to share. We will take it from there.