See the position of the sun or moon, interact with a virtual 3-D toy, and make your own photo filters 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.

iPhone:

Lumos: Sun and Moon Tracker ($2.99 → Free, 9.0 MB): See the position of the sun or moon at any time with Lumos. Photographers, stargazers, rock climbers, and anyone else interested in what the sun or moon are up to.

Lumos uses augmented reality to show you the positions of the sun or moon. Simply launch the app and turn in the direction the arrow is pointing to get yourself aligned with the path of the sun or moon. You’ll then see hourly time stamps for each position. Lumos allows you to quickly switch between sun and moon positions, and you can jump ahead in time to plan your days. The app also includes sunrise and sunset times.

Lumos: Sun and Moon Tracker is available for free for a limited time. It has a 3.5-star rating with a total of 14 ratings.

Parker Planner ($1.99 → Free, 4.2 MB): Record and plan every facet of your life with this handy productivity app. Students, business professionals, and anyone else in need of a single app to manage their lives.

The app’s main view allows you to see upcoming events for the day, any notes and ideas you may have, and any tasks you need to complete all at once. You’re also able to view each of the three separately. Tap once on an open spot on your calendar to add an event or tap twice to add more details. The app syncs with your iPhone’s built-in calendar or any of the other popular online options. It also includes multiple themes to choose from, icon badging, and sound effects.

Parker Planner is available for free for a limited time. It has a 4-star rating with a total of 168 ratings.

Universal:

Cosmic Top ($1.99 → Free, 10.8 MB): Interact with a virtual 3-D toy with Cosmic Top. Those who want to relax or just have some fun.

Cosmic Top is best described as a pure visual and audio experience. Its realistic physics are based on Euler’s equations for rotating bodies, allowing you to spin, wobble, and morph insanely colorful objects via tilt and touch. There’s no limit to the shapes and sounds that are generated, so put your fingers to the screen and enjoy. The app also includes the ability to record and share what’s happening on the screen.

Cosmic Top is available for free for a limited time. It has a 4-star rating with a total of 647 ratings.

Preset – Design Custom Photo Filters ($1.99 → Free, 25.9 MB): Make your own photo filters with Preset. Those who want to stand out.

Preset allows your photos to stand out from the crowd. It provides you with a set of 27 filters, which can be mixed and matched however you wish. Common gestures allow you to quickly swap, delete, and temporarily disable filters within their layer chain. Your favorite combination of filters can be saved and reused over and over again.

Preset – Design Custom Photo Filters is available for free for a limited time. It has a 4-star rating with a total of 18 ratings.

CALC Swift ($1.99 → Free, 12.9 MB): Crunch numbers faster than ever before with CALC Swift. Students, teachers, and anyone else in need of a powerful calculator.

CALC Swift is a multi-functional scientific calculator that’ll make your daily calculations a breeze. It features both standard basic and scientific calculation functions, which can be accessed with a horizontal swipe. It includes more than 50 advanced functions in all. A history log allows you to pull up numbers at any time and copy them for use in other apps. CALC Swift also includes a widget, Spotlight search, Apple Watch support, and colorful themes to choose from.

CALC Swift is available for free for a limited time. It has a 4.5-star rating with a total of 33 ratings.

Ikaro Racing HD : Air Master ($3.99 → Free, 165.1 MB): Speed through the air to earn a victory in Ikaro Racing. Fans of flight simulation.

Hop into the cockpit of one of five high performance planes and take to the skies in the race of your life. You’re able to pilot the planes using tilt controls, and the speed can be controlled with on screen taps. Fly through the gates faster than your opponents to claim first place. The game also includes five environments, 22 tracks, six camera views, and varying daylight and weather conditions.

Ikaro Racing HD : Air Master is available for free for a limited time. It has a 4.5-star rating with a total of 45 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.

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 [email protected] 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.