AltLang MT plug-in

What is AltLang?

In different regions, speakers of the same language use alternative spellings or make different vocabulary choices leading to clearly recognisable language varieties (i.e. British and American English).
AltLang is an automatic language variety converter that will help you deliver content into different varieties of the same language. It has been developed by Prompsit and it is based on Apertium technologies. Its conversions are completely reliable and will make your content be not just in the right language but also in the right variant of your clients.

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How can I test AltLang in MateCat?

Prompsit is offering AltLang for free and you will find it as one of the machine translation systems available in MateCat. You just have to choose it among the available machine translation systems and enter the credentials below.

Prompsit is now offering the AltLang service for free.

Your free credentials are:

  • Engine name: AltLang
  • Key: 4Acu5Wr8

Language variants covered by AltLang

The language variants available through AltLang are:

  • European Spanish – Spanish Latin America (es_ES–es_LA)
  • British English – American English (en_GB–en_US)
  • European French – Canadian French (fr_FR–fr_CA)
  • European Portuguese – Brazilian Portuguese (pt_PT-pt_BR)

How does AltLang work?

AltLang automatically replaces the existing differences between two varieties of the same language. By performing only the necessary changes, AltLang reliably adapts content from one variety to another in seconds.
The main phenomena covered by AltLang include vocabulary, syntax, spelling, style (i.e. punctuation, dates and hour formats, etc.) as well as other socio-linguistic differences.

Can I modify or enhance AltLang?

AltLang is fully customisable. We are really happy to hear from you if you find a new conversion to add to it in any of the varieties. Please report them to
We are also able to develop new varieties for existing languages or for new ones. If you have something like this in mind, contact Prompsit at

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