The Lebesgue: Smarter Marketing app is currently available in English only. Further localisations will be done in the future, but are currently not a part of our immediate plans.

The software being in English does not limit its functionalities to non-english stores, though! You can still use all of the features and get insights regardless of the language your store is in.
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The one limitation, though, will the be Copy creation feature which is currently only available to create copy suggesstions in English.