Making apps is easy but difficult to monetize according to Vietnamese app developers and analysts. While tens of thousands of apps have been created, only about 2% generate revenue. The cost to develop an app can range from $5,600 for more complex games, to as little as $50,000 for simpler apps. However, apps typically need tens of thousands of downloads before companies will pay for ads, where some ads can earn $200 per day. The most successful revenue generating apps tend to be games, with one game company earning up to $3 million per month from a popular game.