It’s finally Friday, dear readers, which means the weekend is officially in sight. Start the celebration early with today’s list of eight paid iPhone and iPad apps on sale for free for a very limited time. And for more premium apps on sale for free, be sure to check out yesterday’s list as well.

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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 were free at the time this post was written. If you click on a link and see a price listed next to an app instead of the word “get,” it is no longer free. The sale has ended. If you download the app, you will be charged.

Extreme Week Calendar

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Normally $0.99.

Light version of the popular Extreme Agenda organizer app. It gives you a 7 day week view and inline day view to add great features not found in the default calendar.

Use it as a great week calendar, or as a trial to see the quality of our advanced Extreme Calendar and Extreme Agenda solutions. Once you are ready you can easily upgrade to the more advanced products from within the app.

Features Include:

Great Calendaring
• Powerful Week and Timeline Day with inline editing.
• Uses and expands on your native calendar data.
• Sync like you would with the default calendar(Google, iCloud, Exchange).
• Advanced repeating event options.
• Move/Copy Events
• Event Templates
• Email Events
• Show events on Facebook
• Military time, ISO week, and week start options.
• Uses time bars and icons to keep you informed at a glance
• Filter events based on iCal calendars.
• Almost 200 professional icons to mark your events

Power and Flexibility
• Universal Support
• TextExpander Support
• Portrait and Landscape Support.
• Retina Display Support.
• Background and color theme choices.
• Help System

• Easily upgraded to Extreme Calendar or Extreme Agenda Planner

Download Extreme Week Calendar

Runtastic Sit Ups PRO

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Normally $1.99.

Want to strengthen your abs and reach 100 sit-ups? Wow, that’s an ambitious goal. You’re in luck, though – the Runtastic Sit-Ups app is the ideal companion to put your plan into action. We know you can do this! Your PERSONAL TRAINER, aka your iPhone/iPad, helps you stay on track – draw motivation from our app to ensure you reach your goal. Sit-ups are among the most popular strength exercises when it comes to a flat belly and ripped abs for a reason. They’re highly effective and a big step towards your sixpack. Seize the moment, make the most of your motivation and kick-off your journey to perfect abs!

APP FEATURES & BENEFITS:
– Accurate count of completed sit-up repetitions using accelerometer
– Three levels based on scientifically developed training plan to reach 100 sit-ups
– Automatic countdown timer for your rest between exercise sets
– Voice Coach for constant feedback
– Personal records & exercise statistics (i.e. monthly or yearly stats)
– Leaderboard for personal records and overall repetitions: compare to others and see how you rank with your Runtastic friends
– Upload workout activities to Runtastic.com
– Integration with Apple Health
– Integrate Runtastic activities to your MyFitnessPal account
– Share your success on Google+, Facebook, Twitter or via email
– Collect motivating badges for your performance

TOP MOTIVATION
Knowing the exact number of sit-ups you just knocked out can totally boost your motivation. Even better: You get a great overview on your fitness activities, allowing you to monitor your progress step by step. You got a thing for records? Increase your ambition with the Runtastic Sit-Ups app and try to beat your personal bests time and again. Then, check out your records and draw motivation for your next session.

UNIQUE
Your sit-ups are automatically recognized using the accelerometer of your iPhone/iPad.

Convenient: You can upload your fitness data to Runtastic.com, if you want. There you can access all your stats anytime, as well as monitor your success thanks to your personal training log. Remember, you can also share your achievements with your friends!

Strong, defined abs won’t just push your self-esteem, they also stabilize your entire body. Rely on Runtastic Sit-Ups for quick and efficient strength training for your midsection. What are you waiting for? Go get those abs! You’ll be surprised how many sit-ups you can do on your first try!

Runtastic Sit-Ups: All you need for a flat belly!

Download Runtastic Sit Ups PRO

Stalag 17 Game

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Normally $6.99.

It’s WWII, and everything is chaos – your countrymen have been captured by the enemy, and it’s up to you to help them escape … But you aren’t the only ones trying to fly the coop! Other countries are trying to break their men out, and the more prisoners that make it, the tighter security becomes. Sacrificing stealth for speed isn’t always the answer though; if you leave items behind, you’ll run into trouble down the line. It’s a fast paced game of strategy as you follow the escape plans, break your allies out, dodge the guards, and get everyone to safety in Stalag 17.

Download Stalag 17 Game

Calendarium

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Normally $0.99.

Calendarium is new, easy to use calendar which gives you a new way to discover many interesting things about this day.

Calendarium combines calendar of historical events with times of sunrise/sunset, number of week, day, day length, moon phase and more.

Features:
• On this day in history – Discover historical events and holidays and share it with your friends via mail, Twitter, Facebook or text message
• Sunrise and sunset time
• Planets View – Shows how all planets of solar system are aligned right now
• Week number, day number, weekday and year
• Number of days passed from 1 Jan and days left until 31 Dec
• Moon phase
• Day length
• Geographic coordinates
• No Internet connection required

Download Calendarium

Sky Gamblers Air Supremacy

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Normally $0.99.

FORGET EVERYTHING ELSE! THIS IS THE ULTIMATE AIR COMBAT GAME! With an extensive single player campaign and revolutionary multiplayer modes, the non-stop action will keep you at the edge of your seat!

Become the supreme lord of the skies!

CONSOLE QUALITY GAMING AND IT’S ONLY ON iOS!
Unparalleled visuals, special effects and audio including: bump mapping, atmospheric scattering, volumetric clouds with realistic lighting, sun glare, day & night transitions, God rays and more!

OPTIMIZED ON THE NEW iPAD AND iPHONE 4S
High definition textures, 4x anisotropic filtering, High Dynamic Range (HDR) rendering, radial blur, jet engine heat haze, refractive raindrops and more!

EXPANDING RANGE OF SINGLE-PLAYER MODES
After the campaign, expand your skills with Dogfight Missions, Survival, Free for All, Team Deathmatch, Capture the Flag, Defend the Base and more to come in the future!
Together, the arenas cover an area four times the size of New York City!

UNRIVALLED COLLECTION OF ONLINE MODES
Invite your friends to play online with cooperative and competitive modes available: Survival, Free For All, Team Deathmatch, Capture the Flag and Defend the Base. There will be more modes to come, so send us your suggestions!

CUSTOMIZE YOUR GAME AND ELEVATE YOUR SKILLS
Air Supremacy is designed for players of all generations and skill levels, whether veteran or novice. You can even leave the flying to the auto-pilot while you fire missiles and issue squadron commands!

MORE TO COME!
Become a fan on Facebook and follow us on Twitter to receive exclusive information about special events, future updates and special downloadable content packs!

Like us on Facebook: http://www.facebook.com/airsupremacy
Follow us on Twitter @sg_airsupremacy

UNIVERSAL APP
Play Sky Gamblers: Air Supremacy on all iOS devices for one low price.

Sky Gamblers: Air Supremacy is compatible with AirPlay and Apple TV.

Download Sky Gamblers Air Supremacy

A-Sketch

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Normally $0.99.

use this app can let your photos into five effect sketches

Function:
-save them to your iPhone.
-Features an easy to use interface.

Download A-Sketch

Pocket Dojo

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Normally $2.99.

Learn Self Defense from a 4th Degree Black Belt!

Pocket Dojo is your instant karate and self defense education app! Learn basic to advanced martial art and self defense techniques and build your confidence in learning how to defend yourself.

Rated the #1 Self Defense App worldwide, Pocket Dojo can help you learn what to do if you are ever confronted by an attacker.

Eric Mendoza, Master Instructor, 4th Degree Black Belt:

Eric Mendoza is a Master Instructor and creator of Pocket Dojo. He is also the founder of the top ranked Arizona karate school, M3 Martial Arts Academy. Eric has enjoyed over twenty- eight years as a martial artist, teacher, and industry consultant. During his martial arts career he was the undisputed T.A.K.A. (kickboxing) Champion in the state of Texas, holding the North, South, and State titles. He has had the privilege of training six world champions and is also a former top rank competitor in forms, fighting, and weapons himself. Eric was honored by Black Belt Magazine as one of the top instructors in the state of Arizona.

Download Pocket Dojo

air radio tune

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Normally $0.99.

air radio tune provides a quick and easy way to listen to thousands of streaming Internet radio stations and other audio streams on your iPhone, iPad, iPod Touch. Download the application to your phone today and browse the enormous directory of stations, searching by location and over 300 different genre such as music, talk, sports and entertainment.

– Access to more than 30,000 radio stations on your iPhone, iPad or iPod Touch.
– Multitasking supports background audio playback so you can listen while doing other things.
– Search for an artist and name of the station.
– Update stations from internet.
– Organize a list of your favorite stations.
– Supports broadband streams.
– Scanning stations with the established interval.
– Set buffering timer.
– Add, edit and delete your own stations.
– Album and artist information displayed when available.
– Time-shifting with live streams:rewind and fast forward back to “live”.
– MP3 “on demand” file streaming with time-shifting features.
– Support for MP3, AAC, and AAC+ v1 (also called HE AAC), and HE AACv2 audio streams.
– Add custom URLs – pls, m3u, mp3 and AAC direct link.
– Automatic handling of interruptions due to incoming phone calls or audio from other apps.
– Music visualizer: see the animations react to the music.
– Information about the free RAM and free storage.
– AirPlay support – stream the music wirelessly to other AirPlay compatible devices.
– Setting of memory for audio packets.
– Defines the amount of audio playback time.
– Local radio stations from China, USA, UK, Russia, Italy, France, Germany, Spain, Ukraine, Portugal, Netherlands, Sweden, Austria, Armenia, Belgium, Switzerland, Poland, Belarus, Czech Republic and Denmark.

Download air radio tune

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