Presently 50languages provides:
43
languages with sound files and
4
languages without sound files.

We plan to have 155 languages in total,
which is the number of languages with
more than 3 million speakers

(according to Wikipedia and Ethnologue):

Acehnese Danish Jamaican Creole Marwari Slovak
Afrikaans Deccan Japanese Min Bei Somali
Akan Dholuo Javanese Min Dong Sotho–Tswana
Albanian Dogri Kamba Min Nan Southern Quechua
Amharic Dutch Kanauji Minangkabau Southern Thai
Arabic Efik Kannada Mongolian Spanish
Armenian English Kanuri Neapolitan Sundanese
Assamese Ewe Kashmiri Nepali Swedish
Awadhi Finnish Kazakh Northern Berber Sylheti
Azerbaijani French Khmer Norwegian Tagalog
Bagheli Fula Kimbundu Oriya Tamil
Balinese Galician Kituba Oromo Telugu
Balochi Gan Kongo Pashto Thai
Bambara Ganda Konkani Persian Tigrinya
Batak Georgian Konkani Piemonteis Tshiluba
Bavarian German Korean Polish Tsonga
Belarusian Gikuyu Kurdish Portuguese Turkish
Bemba Greek Kyrgyz Punjabi Turkmen
Bengali Guarani Lithuanian Rajasthani Ukrainian
Bhili Gujarati Lombard Rangpuri Umbundu
Bhojpuri Haitian Luyia Romanian Uyghur
Bikol Hakka Madurese Russian Uzbek
Buginese Haryanvi Magahi Rwanda-Rundi Venetian
Bulgarian Hausa Maithili Santali Vietnamese
Burmese Hebrew Makuwa Serbo-Croatian Wolof
Catalan Hiligaynon Malagasy Shan Wu
Cebuano Hindi-Urdu Malay Shan Xhosa
Chewa Hungarian Malayalam Shona Xiang
Chhattisgarhi Igbo Mandarin Sicilian Yoruba
Chittagonian Ilokano Mandingo Sindhi Yue
Czech Italian Marathi Sinhalese Zulu