learning  a foreign  language  in  order  to  see  whether 
this  method  could  be  introduced    and  used  as  the 
sustainable method in future education. 
However,  it  is  necessary  to  highlight  that  we 
should be careful while choosing the applications we 
would like to use on the online sessions as a powerful 
source and tool for studying. To avoid inappropriate 
ones we are to try them ourselves first. It would be 
wise  to  add  that  while  choosing  the  mobile 
application  for  the  better  learning process  you  as  a 
teacher or tutor should take into account that free or 
no  fee  applications  are  more  preferable  to  suggest 
your  students  on  lessons.  Hence,  in  order  to  enrich 
your  lessons  with  engaging  activities  to  keep  your 
students  motivated  and  simultaneously  relaxed 
during  both  synchronous  and  asynchronous  online 
sessions  you  need  to  choose  better  one  established 
application than several typical ones which have not 
been tested yet. 
In the given article we are focused on examining 
the educational value of the popular among students 
(and adults too) mobile application Duolingo. Giving 
the  brief  history  of  this  free  educational  platform 
suggesting different  languages to  learn,  underlining 
its strong sides, evaluating the progress of the learners 
in a graph, as a next step we are to draw conclusions. 
The relevance of the topic is provided by the fact 
that  the  recent  lockdown  has  changed  our  lives 
dramatically  and  in  order  to  adapt  to  the  new 
unfamiliar  and  sometimes  depressing  conditions  is 
our main goal. To achieve it we need to think about 
the modern equally useful for teachers and students 
ways of future learning in the given life 
circumstances we were not ready for.  
2  METHODS  
The methodological framework of the study is based 
on the comparative method, i. e. the survey containing 
learners` answers covering numerous  aspects of  the 
mobile learning that allow to investigate whether so 
popular and  beloved  application Duolingo could be 
useful and  effective  way of teaching  and  learning a 
foreign  language  or  languages.  It  would  be  wise  to 
mention that 60 students of the Naberezhnye Chelny 
Institute/the  brunch  of  KFU,  Kazan  Federal 
University  (from  the  freshmen  to  graduates)  were 
surveyed. 
Also  the  analytical  technique  is  used  while 
assessing  the  contents  of  the  mobile  application 
Duolingo,  its  educational  value,  also  taking  into 
account the data of the surveys which led to further 
statistics.  
The  experimental  data  provided  in  the  paper 
belong to the authors of the article. Being teachers of 
English  we  have  tested  this  application  ourselves 
choosing English,  Turkish  and  Arabic  languages  to 
learn. The choice was made deliberately in order to 
scrutinize the application from the point of view of a 
new learner and advanced one, respectively. 
The  following  works  laid  fundaments  of  our 
study: 
  Keegan,  D.  (2005).  The  incorporation  of 
mobile learning into mainstream education and 
training.  Retrieved  from 
https://ru.scribd.com/document/245786939/Ke
egan-the-Incorporation-of-M-Learning-in-the-
Mainstream-Education-Training.  
  Keegan,  D.  (1996).  Foundations  of  Distance 
Education. Routledge. 
3  RESULTS 
The application under consideration is Duolingo that 
is an American language-learning website and mobile 
application, as well as a digital language-proficiency 
assessment  exam.  The  company  uses  the  so-called 
freemium  model.  Freemium   is  a  blending  of  the 
following words free and premium, in more common 
sense is a pricing strategy by which a basic product or 
service  is  provided free  of  charge,  but  money  (a 
premium) is charged for additional features, services, 
or  virtual  (online)  or  physical  (offline)  goods  that 
expand  the  functionality  of  the  free  version  of  the 
software  (Guliani,  2017). This  business  model  has 
been used in the software industry since the 1980s. A 
subset of this model used by the video game industry 
is  called free-to-play.  The  analyzed  application  and 
the  website  are  accessible  without  charge,  although 
Duolingo also offers a premium service for a fee. As 
of 10 February 2021, the language-learning website 
and  application  offered  106  different  language 
courses in 38 languages. The application has over 300 
million  registered  users  across  the  world  (Settles, 
2013).  Hence,  this  mobile  application  is  definitely 
worth  analyzing  and  underlining  advantages  and 
disadvantages,  respectively.  While  scrutinizing  its 
relevance  and  educational  value  the  screenshots 
would  be  added  to  support  statements  that  were 
formulated during our experimental use of the given 
application.  Three  languages,  English,  Turkish  and 
Arabic, were chosen to learn by means of Duolingo. 
Having used this application for nearly six months we 
could  outline  some  of  its  main  working  principles. 
They are the following.  
ISSDRI 2021 - International Scientific and Practical Conference on Sustainable Development of Regional Infrastructure