Nombre en lettres is an Android application developed by Pampered Bytes that converts any given number into its word form. This app provides an efficient way to convert numbers into words, including a "monetary" mode that is useful for spell-checking amounts in checks. It is a great tool for anyone who needs to write out numbers in their full form, such as in legal documents, invoices or receipts.

With Nombre en lettres, users can convert numbers up to 999,999,999 into words in both English and French languages. The app also allows users to choose between masculine and feminine forms of the words in the French language. The app is completely free and does not require any in-app purchases or subscriptions.

Overall, Nombre en lettres is a useful and efficient tool that can help individuals and businesses to save time and effort when it comes to writing out numbers in their full form.