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Suomi · 5.5 million speakers · Lemmatizer: Voikko

Full morphological lemmatization

Finnish has a reputation for being hard because its words shape-shift across fifteen cases, consonant gradation, and vowel harmony. Laesi solves the reader's half of that problem with Voikko, the reference-quality open-source Finnish analyzer. This is one of the languages we're most proud of.

Get Laesi for Finnish → See a reading sample
Why Laesi for Finnish?

What the big apps miss

01

Voikko, the best open-source Finnish analyzer

Voikko is built and maintained by the Finnish computational-linguistics community. It's what every serious NLP project uses, and Laesi knows how to drive it and walks you through installing it.

02

Handles consonant gradation and vowel harmony

Kirja / kirjan / kirjaa / kirjassa / kirjoista are all forms of one word. Voikko identifies the lemma behind each one, and Laesi still tracks the forms separately underneath it, so a shape you have never seen doesn't count as already known.

03

Designed for morphology-heavy languages

Laesi was built with Finnish in mind from day one. If it works here, it works for Icelandic, Faroese, Hungarian, and everything else with dense morphology.

Reading sample

Seitsemän veljestä, opening

Aleksis Kivi, 1870

Jukolan talo, eteläisessä Hämeessä, seisoo erään mäen pohjoisella rinteellä, liki Toukolan kylää.

Unseen Seen Recognized Remembered Known (no highlight)
Suggested library

What to read in Finnish

Mostly public domain. Drop the EPUB into Laesi and start.

Kalevala
Elias Lönnrot, 1835 & 1849

The Finnish national epic, compiled from oral tradition. Challenging but foundational.

Seitsemän veljestä
Aleksis Kivi, 1870

The first Finnish-language novel. Canonical.

Tuntematon sotilas
Väinö Linna, 1954

The Unknown Soldier. War novel, modern Finnish.

Selkouutiset (Yle)
ongoing

Easy-Finnish news from Yle, the best intermediate reading material in any Nordic language.

Features, for Finnish specifically

Finnish was the first language Laesi took seriously. These features are native to how the app is designed.

See everything Laesi does →
  • 01
    Voikko morphological analysis
    Real linguistic analysis, not string matching. Handles all 15 cases, both numbers, and consonant gradation across verb and noun classes.
  • 02
    Compounds read as words
    A compound like maailmanloppu is lemmatized like any other word, so you look it up once and carry on reading.
  • 03
    Kotus-style output
    Finnish word-form output mirrors Kotus (Institute for the Languages of Finland) conventions, familiar to anyone who's used a Finnish dictionary.
  • 04
    Selkouutiset support
    Yle's easy-Finnish news is excellent intermediate material. Drop the articles straight into Laesi.
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