The reliability of punctuation checkers depends on a few factors, including the particular checker being used and what types of errors are within a piece of writing. Different checkers can be more or less reliable depending on the company that developed the software, which means that some checkers may be more reliable than others. Older versions of some checkers may also be less reliable than newer versions, as software improvements can allow a checker to find more complicated errors. Ultimately, punctuation checkers are unlikely to catch all errors in punctuation, and careful rereading of any typed work is advisable.
Punctuation checkers are programs, or utilities within pieces of software, that check a written work for errors in punctuation. These may be separate from spell checker programs that scan a work for errors in spelling, though some utilities combine both functions in a single program. In general, punctuation checkers can be quite reliable and may help a writer catch a number of errors that he or she would have not noticed otherwise.
There are some errors that can easily get past punctuation checkers, however, since no system is perfect. The difference between “it’s” and “its” might not always be caught by a punctuation checker, though most spell checking programs can catch this error. This is why the use of both types of programs is advisable and both utilities are often a part of major word processing software.
The reliability of punctuation checkers can also vary depending on the particular program and how old it is. Different developers may utilize different features in programming that allows one piece of software to more accurately detect errors than another program. Older programs also may not have all of the features that new software includes. As new methods and techniques are used in programming, including the use of artificial intelligence and neural networks, punctuation checkers can become more sophisticated and find errors that older programs could not find.
There is also the potential for “false positives” from a punctuation checker, however, such as flagging non-standard punctuation that a writer may want to use like an "interrobang," or sarcasm mark. This is why writers should always reread and revise their own work, in addition to considering any suggestions made by punctuation checkers. Even the most advanced checkers can still make mistakes or flag issues that a writer wishes to keep in a piece of work.