The following examples were taken from a random online review: Grammarly doesn't do all it claims to do (Note 8-12-16: Review was removed and replaced with Grammarly advertising)
The test samples:
Obvious spellings errors
I definately love cats.
Grammarly - No
After the Deadline - Yes
Ginger - Yes
grammarcheck.net Yes
Grammarian PRO2 - Yes
Less obvious spelling errors
I got a letter form my girlfriend.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
She said she wont ever stop loving me.
Grammarly - No
After the Deadline - No
Ginger - Yes
grammarcheck.net - No
Grammarian PRO2 - Yes
Grammar and punctuation mistakes
I don't understand it's point.Grammarly - Yes
After the Deadline - No
Ginger - Yes
grammarcheck.net No
Grammarian PRO2 - Yes
The term paper had no typo's.
Grammarly - No
After the Deadline - No
Ginger - Yes
grammarcheck.net No
Grammarian PRO2 - No
So the student and me had a talk after class.
Grammarly - NoAfter the Deadline - No
Ginger - Yes
grammarcheck.net No
Grammarian PRO2 - Yes
I said it was well written, however the argument was confusing.
Grammarly - Partially
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
Commonly confused words
I made a concerted effort.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - No
The politicians make it hard for anyone to affect change.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
No one cares about the corral reefs.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
Redundancies
We have various different specialties.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
You and I are equally as good at tennis.
Grammarly - Yes, but falsely flags other errors
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
The general consensus is that you're better.
Grammarly - No, and falsely flags other errors
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
The whole entire world is wrong.
Grammarly - No, and falsely flags other errors
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
Questionable style choices
This was the 11th time it had happened.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
Troublesome compounds
I refuse to cleanup after you.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
We are already to go.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - No
Your tardiness has become an every day thing.
Grammarly - Yes
After the Deadline - Yes, parse identical to grammarcheck.net
Ginger - No, and falsely flags other errors
grammarcheck.net Yes, parse identical to After the Deadline
Grammarian PRO2 - Yes
New words, colloquialisms, and nonstandard variants
Next week is a whole nother season.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
Let's hope she can afford preventative care.
Grammarly - No
After the Deadline - No
Ginger - No
grammarcheck.net No
Grammarian PRO2 - Yes
Summary
Scores:
|
 |
 |
| Grammarian PRO2 | 17 | 3 |
| Grammarly | 4 | 16 |
| Ginger | 4 | 16 |
| After the Deadline | 1 | 19 |
| grammarcheck.net | 1 | 19 |
1. In these tests, Grammarian PRO2 is the leader.
2. The tests show that some of the online checkers are of the same code.
3. Grammarly makes claims of "the most accurate grammar checker in the world." This is a false claim. Knowledgeable unbiased online reviewers catch these claims.
4. The samples are from an unbiased online Grammarly review.