I have previously reviewed two law dictionaries for the iPhone, the definitive Black's Law Dictionary which contains over 43,000 definitions and costs $49.99 and Nolo's Plain English Law Dictionary, which contains over 3,000 definitions written in plain English and is free.
The Barron's Law Dictionary app fits neatly between these two offerings. Like the Nolo dictionary, the Barron's dictionary contains over 3,000 terms. Like Black's, the Barron's dictionary has more sophisticated definitions, although in my random check they seem to use less legalese than Black's. And the price of $14.99 fits between the other two dictionaries.
When I reviewed the Black's Law app I looked up some civil law terms like redhibition and prescription. Redhibition doesn't even appear in the Barron's app, and the definition of prescription is more limited, omitting for example the concept of liberative prescription which the Black's app includes.
But for the definitions that Barron's does include, the definitions seem quite good. For example, Barron's includes an excellent definition of damages (the beginning of which is shown above) and, like Black's, also offers definitions of related concepts such as actual damages, consequential damages, exemplary damages, etc. Like Black's, many terms within the definition contain hyperlinks to definitions of those terms.
The Barron's app doesn't include many of the extra features of Black's. For example, there are no quotes showing the use of a term by notable speakers and no audio pronunciation, both of which are included with thousands of the terms in Black's. But the app includes a search feature which shows you results as you type and, like Black's, the app is quick and responsive.
Black's Law Dictionary is the standard by which all other legal dictionaries are judged. If the Black's app were cheaper, then lawyers would have no need for other dictionaries like Barron's. But I know many lawyers who can't justify spending $50 on a legal dictionary for the iPhone, and for them, the Barron's app at only $15 is a nice alternative. For non-lawyers, Barron's also has the advantage of using slightly less legalese in its definitions—not to the extreme of the Nolo's Plain English Law Dictionary, but enough to be appreciated by non-lawyers.