text-readability-score
Copyright 2026 Flemming.AI

This product includes software developed by Dr. Stefan Flemming
and contributors (https://flemming.ai/).

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Third-party acknowledgments

JSON (de)serialization uses `serde` + `serde_json`
(https://github.com/serde-rs), Apache-2.0 / MIT licensed.

Module SDK glue is provided by `chain-module-sdk`
(https://git.flemming.ai/fai/chain-module-sdk-rust), Apache-2.0.

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Methodological lineage

Flesch-DE follows the Amstad adaptation of Flesch Reading Ease
for German:  FRE_de = 180 − ASL − (58.5 × ASW),
where ASL is the average sentence length in words and ASW is
the average number of syllables per word.

Reference:
  Toni Amstad, "Wie verständlich sind unsere Zeitungen?"
  University of Zürich, 1978.

The depth-index weighting (i.V.m.-edges count double because
the reader must chase a second norm) is an original
operationalisation of the Studie §6 "Verweistiefe"-Achse.