Find suitable word replacements, convert units, and learn addition and subtraction 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:

WordMap – Handy Thesaurus ($0.99 → Free, 103.4 MB): Find suitable word replacements and extend your vocabulary with WordMap. Everyone from students to professionals.

WordMap is best described as an interactive thesaurus. Input any word and WordMap will not only provide a definition but also map out associated words. Tap on any of the associated words to dig deeper. The intuitive interface displays semantic relations between words and color codes them for different parts of speech. WordMap also includes editable bookmarks, undo and redo, and the ability to save the result map.

WordMap – Handy Thesaurus is available for free for a limited time. It has a 4-star rating with a total of 5 ratings.

MathEdge Add and Subtract ($2.99 → Free, 30.5 MB): Learn addition and subtraction with MathEdge. Parents and teachers.

MathEdge provides a step-by-step guide to learning addition and subtraction. You’re able to create custom questions for your child or simply select one of the built in difficulty levels. The step-by-step guide will walk your child through the problem with audio hints and even carrying the one for them. The app also caters to left and right handed children. A flash card option is available as well to help your child hone their skills.

MathEdge Add and Subtract is available for free for a limited time. It has a 4.5-star rating with a total of 114 ratings.

Convertible: Unit Converter ($0.99 → Free, 12.4 MB): Convert normal and not-so-normal units with Convertible. Everyone.

Convertible is able to convert units of measurement, currency, and a whole bunch of non-standard and real-world units. Non-standard and real-world units consist of things like tigers, red blood cells, AAA batteries, and baseball bats. The app’s intuitive interface allows you to just slide the unit categories and measurements left and right to choose them. Conversions can be swapped and shared via Twitter or email. The app also includes 19 themes to choose from.

Convertible: Unit Converter is available for free for a limited time. It has a 4.5-star rating with a total of 337 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.