Today’s apps gone free: Note Rocket, Knots 3D, Tadaa SLR and more

Our collection of apps today will help you put the focus on objects and subjects. Note Rocket allows you to annotate photos. Tadaa SLR has the ability to make sections of photos stand out. Knots 3D shows you how to tie 101 different knots.

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:

Tadaa SLR ($5.99 → Free, 21.4 MB): Take fantastic SLR-quality photos with Tadaa SLR. It’s designed for those who want to put their subject in focus.

Tadaa SLR does most of the heavy lifting for you, but it includes a handful of powerful editing features that will please even the most seasoned iPhoneographers. After taking your photo you’re able to apply a mask to your subject manually or have Tadaa SLR detect the edges automatically. The aperture, highlight and gloss levels, and range of your blur effect can be adjusted via sliders. Circular, linear, and complete blur options are available as well. With your subject fully in focus and background blurred out, go ahead and add some filters before sharing it.

Tadaa SLR is available for free for a limited time. It has a 4-star rating with a total of 354 ratings.

Note Rocket: sketchpad for photos, write, type, draw on photos, add voice memos and inform coworkers,clients and friends. ($1.99 → Free, 21.1 MB): This lightweight and user friendly productivity app allows you to take photo notes with ease. It’s the perfect app for anyone who needs to take visual notes or explain something with annotations.

Note Rocket is a true time saver. Snap a photo from within the app or import one from your library. Then draw and sketch directly on top of the photo to get your point across. Text and audio can be attached to your photo to provide additional details. Your final creation can be stored within the app, pushed to your favorite cloud service, or shared via your preferred social networks.

Note Rocket: sketchpad for photos, write, type, draw on photos, add voice memos and inform coworkers,clients and friends. is available for free for a limited time. It has a 5-star rating with a total of 11 ratings.

Universal:

Noir Run ($0.99 → Free, 95.9 MB): Try to make it through the day with a smile and defeat despair in this gloomy platform game. Fans of noir films will enjoy everything about Noir Run.

Even though it’s dark and gloomy, Noir Run has a positive message: Keep that smile on your face! You must defeat your inner demons by making your way over nasty obstacles and through horrible bosses. Each day offers a new challenge, and you can utilize gifts to help you achieve your goal. Whatever you do, don’t let despair win!

Noir Run is available for free for a limited time. It has a 4-star rating with a total of 45 ratings.

Particle Box ($1.99 → Free, 777.4 KB): Find out what it’s like to command 20,000 different particles with only the tips of your fingers with this interactive entertainment app. It’s ideal for those who need a moment to relax.

Particle Box allows you to manipulate huge amounts of particles in a wide variety of ways. Just tap and swipe with multiple fingers all over your iDevice’s screen and watch what happens. You’re also able to stream the action through your TV via AirPlay.

Particle Box is available for free for a limited time. It has a 4.5-star rating with a total of 77 ratings.

Knots 3D ($0.99 → Free, 43.6 MB): Learn how to tie 101 different types of knots with this detailed reference app. Almost everyone will find Knots 3D to be handy at some point.

With Knots 3D, anyone can learn to tie a knot. You’re able to watch each knot tie itself, and you can pause or adjust the speed of the animation at any time. You can also rotate each knot 360 degrees, and zoom in using multitouch gestures. Knots can be broken down by category or class, and they can be added to favorites for quick reference.

Knots 3D is available for free today only (02/12). It has a 4.5-star rating with a total of 2663 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.