The decision puts Navalny and nine of his allies on a par with right-wing nationalist groups and foreign terrorist organisations, including the Taliban and Daesh.
The company's refusal to delete the opposition app created by Kremlin critic could be considered interference to the country's parliamentary elections later this month, Moscow says.
Moscow court outlaws organisations headed by jailed Kremlin critic Alexey Navalny as "extremist", rendering their staff liable to criminal prosecution.
President Vladimir Putin signs legislation that bars members of "extremist" organisations from running for office, a decision allies of jailed Kremlin critic Alexey Navalny say aims to sideline them from parliamentary election this year.
Kremlin critic Alexey Navalny recovered from a near-fatal poisoning attack last year only to again be on the brink of death while on hunger strike in a Russian prison in a bid to access medical care for his other ailments.
Meanwhile, Russian police detain several allies of Alexey Navalny and raided two of his regional offices, a day before his supporters plan to stage mass protests over his failing health amid a hunger strike.
Sentenced to two and a half years in prison for embezzlement, Navalny has been on a hunger strike to demand medical treatment for back pain and numbness in his hands and legs.
The 44-year-old politician Alexey Navalny has a bad cough and a temperature at 38.1 degrees Celsius, but will carry on his hunger strike, demanding proper treatment for his acute back and leg pain.
Alexey Navalny says he wants the prison holding him outside Moscow to provide him with proper medical care.
Navalny, who is considered a flight risk by authorities, said he is woken eight times per night by guards announcing to a recording camera that he is still in his cell.
The measures are part of a package of human rights sanctions targeting a dozen individuals from Myanmar, China, Russia, North Korea, Eritrea, South Sudan and Libya.
Alexey Navalny will serve his two years and six months in a penal colony outside Moscow for breaching parole terms while recovering in Germany from a nerve agent poisoning.
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