Among them, the education based on the ground: in the teaching business, Xunfei constructed for the local city and county (G end) of the teaching solution, for the school (B end) of the layered personalized homework program, for the children (C end) of the KU Xunfei AI Learning Machine, which is Xunfei's business of the core logic and solutions, and can already be used to see the real application of the results of statistical data, achieve significant improvement in the teaching quality of the consecutive college entrance exams in 2020 and 2021. Last year, Xunfei education based on the local business added 20 new urban counties, revenue growth of 48%, this year to do more than 50 urban counties. At the same time according to the local business can further bring more equipment renewal and expansion as well as incremental services. In 2022 based on the logic of the big place, the business contract gross profit is expected to grow by more than 80%.
In the English listening and speaking test business, Xunfei in 2021 added 4 provinces of the college entrance examination, 29 cities and municipalities of the secondary school examination, revenue growth of 45%. On this basis, this year's business contract gross profit is expected to grow by more than 50%. In the coming years, the coverage of the entire district, county, prefecture and city as a unit will be further increased. In the personalized learning manual business, Xunfei 2021 saw a 40% year-on-year growth in user size and a 50% growth in the number of fee-paying schools, and the effectiveness of its application has been widely recognized by teachers and students: the renewal rate increased from 75% to 90%, and the conversion rate was mentioned as 65% from 58%. This year's expected growth will exceed 70%. In the learning machine business, 20,000 new classes will be served in 2021; at the same time, Xunfei has also made simultaneous efforts in the C-end to achieve an overall sales growth of 150%, a 300% increase in double 11 sales, and the user-recommended NPS value is located in the industry's first. Learning machine revenue is expected to grow by more than 200% this year.
Intelligent city based on the ground, last year Xunfei built the Jianghuai big data center platform, Anhui Province, 16 cities have been accessed, has exchanged 1 trillion pieces of data, *** enjoy calling national ministries and commissions interface data in the country ranked the top three; Anhui affairs APP called 330 million times, with tens of millions of active user groups, will build a data base in Anhui + APP operating model of the The company is a national benchmark in Anhui.
Consumer base, Xunfei's translator, voice recorder and other increasingly new products, but also in the industry occupies an important position, the formation of KU Xunfe loyal fan base, the overall development of the product is red-hot, the C-terminal business can continue to maintain the upward trend.
Medical base, 2021 Xunfei general practitioner assistant daily average to provide diagnosis has reached 770,000, an increase of 40%, the annual valuable correction diagnosis of more than 170,000. In the country has covered 280 counties and districts, the family doctor assistant daily visits increased by 100%.
In terms of the automotive base, the immediate value of AI technology applied in the car is constantly recognized, and the multilingual technology is constantly verified in the international car companies, Xunfei has become the world's best voice technology provider, and continues to make progress towards multimodal and cognitive aspects. Last year, Xunfei added as many as 200 cooperative models.
In terms of operator base, by cooperating with operators, we reconstruct a warm family center for each family's big TV screen, and through Xunfei's voice remote control, we have activated 60 million last year, with a daily activity of more than 6 million, and the number of users will break through 10 million this year.