As part of our never ending series of features designed to help you find terrific free iOS apps, we’ve found four more apps that were previously paid that have now gone free for a limited amount of time. This week we’re bringing you apps that will help you transfer and manage documents to and from your iOS device, plan meticulous workouts and exercises, superimpose multiple photos on one another, and record great looking movies from your phone or tablet.

These are paid iPhone and iPad apps that have been made available for free for a limited time by their developers. There is no way to tell how long they will be free. These sales could end an hour from now or a week from now — obviously, the only thing we can guarantee is that they are free at the time this post is published. If you click on a link and see a price listed next to an app instead of the word “free,” it is no longer free. The sale has ended. If you download the app, you will be charged.

With that disclosure out of the way, here are four paid iPhone apps that have just gone free.

Movie Pro

Simply put, MoviePro wants to be the only video recorder and editing app you’ll ever need and it features functions for pausing and zooming while also supporting 3K resolution and slow motion video among many, many other things.

• Recording Features‌ • ▶ Pause/Resume,

▶ Real Time Zoom(high quality zoom as compared to native recorder),

▶ Capture Stills while recording,

▶ Full 8 MP resolution Stills while recording on iPhone 5s,

▶ Select resolution (1920×1080 to as low as 320×240),& aspect Ratio(including square 1:1 for Instagram & anamorphic widescreen aspect ratios like 2.75:1, 2.55:1, 2.40:1),

▶ Record in 3072×1728 @30fps resolution on iPhone 5s at 120 Mbps bit rate,

▶ Select 2592×1458 (16:9), 2560×1440 (16:9), 2560×1920 (4:3) in settings on iPhone 5s, iPad Mini Retina, iPad Air

▶ Frame Rate – 30p, 25p, 24p, and down to 1 Fps.

▶ 720p 120 fps for iPhone 5S,

▶ 720p 60 fps mode for iPhone 5, iPad Mini and later.

▶ Adjustable Video Quality (Bit rate) including high 50 Mbps and lower ones to save disk space,

▶ Both Portrait & Landscape mode recording,

▶ Uncompressed Audio Option, real time Audio Monitoring through headphones with adjustable input volume (mic gain) along with Audio Meters,

▶ Record Silent Movies (choose “Silent” in Audio Settings),

▶ External Microphone Input and set volume,

▶ Spy Mode: Choose image from Photo Library or simply show black screen to record secretly,

▶ Choose record duration, such as 6 sec for Vine and 15 sec for Instagram

▶ Timer to trigger Recording,

▶ Share to Camera Roll Dropbox, YouTube, Facebook,

▶ Single & Separate focus/exposure mode,

▶ AE, AF, Auto White Balance Lock,

▶ Location tag, Copyright info in Video Metadata. Automatically inserts creation date in metadata,

▶ Video Stabilisation (iPhone 4S or later)

▶ Volume Shutter option in settings,

▶ Switch Cameras while recording with ZERO loss of Audio and perfect lip sync,

▶ Very high reliability • Editing Features‌ • Includes two video editors. Mini Editor is an individual clip editor while the full Editor can operate on multiple clips & manage projects, ▶ Copy clips from Camera Roll in the library,

▶ Trim, Rotate, Compress, Slow/Fast motion adjust resolution & aspect ratio is Mini Editor, ▶ Full Editor : Merge, Split, Trim, Reorder clips, insert transitions, titles, select title color & font, title position, insert logo from Photo Library, scale & position logo,

▶ Save compositions as Projects in Editor 2 and export them to Photo Library

▶ In Full Editor, Videos added from Photo Library or recorded with app are only linked and not duplicated. Please do not delete the original clips therefore.

MoviePro normally costs $4.99 but you can download it for free right now for a limited time.

SuperImpose Studio

SuperImpose Studio is an easy way to take two or more photos you have and quickly mash them together into a completely new image. As you can see in the image above, SuperImpose can let you crate a picture of a monster rubber ducky attacking a city, among other things.

Superimpose your photos using Superimpose Studio! Combine photos into professional quality photomontages using our easy to use software. You don’t need expensive software for simple and high quality tools to superimpose your images. Our technology gives you all the professional tools you need. ≈ Easy and Simple ≈

◎ Load your background image

◎ Load your foreground image

◎ Erase any parts of your foreground image

◎ Zoom in for finer editing

◎ Save your image to finish. You’re done! ≈ Photo Editor EXTRA Features ≈

◎ Intelligent one-tap Auto Enhance filter.

◎ Draw on your photos.

◎ Add fun stickers and text.

◎ Adjust Brightness, Saturation and Contrast.

◎ Sharpen and Blur.

◎ Adjust, Crop, and Rotate your photos.

◎ Red-Eye, Whiten and Blemish tools

◎ Additional ten gorgeous photo effects to apply to your photos. Superimpose your cat’s head on your friend for a goofy and fun image. Create professional quality images by combining elements from one photo onto a beautiful scenic background. Superimpose Studio makes it easy.

– NEW VERSION 2.0!

– Completely redone for iOS7 and iOS8!

– NEW user interface!

– Fixed bugs

– Optimized for performance! SuperImpose Studio normally costs $2.99 but is now free to a limited time to celebrate its version 2.0 release. Sworkit Pro Sworkit Pro gives you a way to plan your workouts depending on which muscles or area of the body you want to exercise. The app’s developers say that they’ve loaded tons of exercise options onto the app, including strength training, cardio workouts and even yoga. Sworkit takes you through 5-60 minute circuit training workouts requiring no equipment. Just choose what part of the body to workout and for how long. Options include strength training, cardio, stretching, yoga, and even an option to create custom workouts. PRO VERSION FEATURES: • Save multiple custom workouts

• Adjustable interval lengths

• 7-Minute Workout other bonus workouts

• Access to complete workout history

• Extra Rewards Points (US only)

• Enable/Disable Rewards Create your own Custom Workouts using any exercises in our library for a fully personalized experience. Great for focused workouts, injury recovery, new challenges, coach created training. high calorie burn, and quick stretches. Download free custom workouts like Low Impact (No Jumping), Pregnancy – Full Body, Booty Roaster, Beginner/Intermediate/Advanced Full Body, Runner’s Warm-up, Office Chair Workout-Stretch, ABsolutely Awesome, Plyometrics, Golfer Workout, Around the Office, Surfer Workout and more. Sworkit Pro normally costs $3.99 but is now free for a limited time. USB Disk Pro And finally, USB Disk Pro aims to give you a comprehensive solution for transferring and managing files on your iOS devices. USB Disk Pro lets you store, view and manage documents on your iPhone and iPod. It has an amazing built in document viewer and is very easy to use, with a simple and intuitive interface, yet it contains many powerful features. Drag and drop files in iTunes to transfer them to your iPhone / iPod, then view them anywhere! TOP REASONS TO BUY • Store and view files on your iPhone / iPod.

• Open multiple documents in different pages.

• Restores last viewing position.

• Navigate using swipes (like Photos / iBooks app).

• Thumbnails let you preview your files.

• Protect & encrypt files using Apple’s Data Protection. MORE FEATURES • View and download email attachments.

• Full screen file viewer.

• Copy, paste, cut, delete and create files.

• USB file transfers.

• WiFi (without iTunes) file transfers.

• TV / VGA out.

• Slideshow with adjustable delay.

• Fast scrolling, page up/down functionalities.

• Email your documents.

• Lock code.

• Download web files.

• In app web browser.

• Background audio. USB Disk Pro normally costs $0.99 but is free until the end of Monday, August 11th — in other words, if you want to get it for free, you need to act right now.