Tools

Metrics

Accuracy

Requirements

Reference

The Biber Tagger

Grammatical complexity metrics

89%

Not public available

Biber et al.

1999

Coh-Metrix

108 metrics of Cohesion, syntactic complexity, lexical diversity, word information

90%

Online interface (Chrome or Firefox browser)

McNamara et al.

2014

L2 Syntactic Complexity Analyzer (L2SCA)

14 metrics of syntactic complexity

F-score of 0.83 for complex nominal

Online interface; MAC, LINUX or UNIX systems with Java

Lu

2010

Tools for Automatic Analysis of Syntactic Sophisation and Complexity (TAASSC)

178 indies of syntactic complexity

91%

Windows, MAC or Python

Kyle

2016