The rest of this paper is organized as follows. The 
second section introduces similar works in emerging 
systems, followed by a review and an analysis of the 
platforms'  pedagogical  and  organizational  benefits 
and drawbacks. 
2  RELATED WORK 
In the last few years, an immense need for adaptive 
learning  has  been  created,  which  has  attracted  the 
attention of many researchers. Therefore, an amount 
of effort has been made to review adaptive e-learning 
systems outlined as follows. In (Akrivi, Christos, & 
Maria,  2018),  authors  reviewed  some  learning 
management  systems  (LMS),  as  well  as  content 
management  systems(CMS),  namely  Moodle, 
ATutor,  Drupal,  Joomla  and  WordPress  and 
compared  them  based  on  many  technical  and 
educational aspects such as ease to use, accessibility, 
customization,  interactions,  usability,  etc.  the  main 
objective  of  their  study  is  to  provide  useful 
information  to  higher  education  to  choose  LMS  or 
CMS  regarding  their  proper  needs.  In  a  similar 
context, the study in  (Abdalla & Dhupia, 
Implementing  Adaptive  e-Learning  Conceptual 
Model : A Survey and Comparison with Open Source 
LMS,  2019),  provides  a  comparison  among  similar 
LMS,  for  instance,  EduBrite,  TalentLMS,  Edmods, 
Sakai based on their features, practical feedback from 
the  students and  instructor, and  the  target customer 
size. The study aims to help university students and 
instructors to choose a suitable learning management 
system.  
In (Kasim & Khalid, 2016), the authors discuss 
multiple  learning  management  systems,  which  are 
Sakai, Blackboard, SuccessFactor, and SumTotal and 
compare them  based on several characteristics  such 
as integration with other systems, accessibility, users’ 
interactions,  flexibility,  synchronous  and 
asynchronous interactions, etc. This study provides a 
conclusion on the selection of platforms to be adopted 
by  the  higher  education  institution.  The  authors  in 
(Yilmaz & Erol, 2019) present a comparative study of 
learning management systems and e-learning author 
tools, which are preferred in Turkey, based on their 
technical  and  educational  features  as  well  as 
disadvantages to contribute positively. In (Florence, 
Yan, Robert, & Carl, 2020),   the authors present a 
systematic  review  of  research  on  adaptive  learning 
based  on  publication  trends,  instructional  context, 
research  methodology  components,  research  focus, 
adaptive  strategies,  and  technologies.  The  study  in 
(Abhinaw  &  Eswaran,  2018),  reviews  several 
learning  management  systems,  namely  Adobe 
Captive  Prime,  TalentLMS,  Docebo,  Litmos, 
Coursemill,  Moodle,  Blackboard,  Electronic 
Educational  Environment  (EEE)  LMS,  based  on  a 
comparison of the identified and essential features. In 
this study (Tsolis, et al., 2010), the authors reviewed 
some  traditional  learning  management  systems  and 
existing  adaptive  e-learning  systems  and  propose 
implementing a combined solution to benefit from the 
advantages of both technologies. 
3  FEE-BASED E-LEARNING 
PLATFORMS  
KNEWTON:  Knewton  is  a  personalized  adaptive 
platform headquartered in  New  York  City, used  by 
more  than  15  million  students  around  the  world.  It 
identifies  and  supports  the  process  of  continuous 
personalized  learning  through  knowledge  maps  and 
real-time  monitoring  and  response  to  student 
interactions  (communication,  collaboration  and 
game),  as  well  as  identifying  and  bridging  the 
knowledge  gaps  while  the  students  are  doing 
homework to get them where they need to go (Peng, 
Ma, & Spector, 2019). In addition, Knewton is one of 
the  first  platforms  to  actively  put  data  analysis 
technologies  at  the  service  of  education  (Osadcha, 
Osadchyi, Semerikov, Chemerys, & Chorna, 2020).  
SMARTSPARROW:  Smartsparrow  is  a 
platform  that  allows  mentors  to  easily  build 
graphically rich online tutorials. They decide on the 
structure of their courses, and the platform does the 
rest. It is an intuitive authoring tool that offers  real-
time interactive learning components; it provides the 
student with a space  adapted to their specific needs 
using questions and feedback. Smartsparrow is based 
in Sydney Australia, and over 700 leading institutions 
trust it; this technology allows improving the e-book 
offer to create new generation e-books that are more 
attractive. 
SCOOTPAD:  Used  by over  400  schools  in  the 
USA,  it  provides  a  tool  for  teachers  and 
administrators to create adaptive learning playlists for 
students.  Students  begin  a  unit  by  taking  an 
assessment; this assessment determines the student's 
needs  and  weaknesses  and  what  instruction  the 
student  should  receive  in  real-time.  As  the  student 
progresses,  ScootPad  adapts  to  his  or  her  progress, 
presenting  different  lessons,  exercises  and 
assessments  for  each  student.  While  students work, 
data is sent in real-time to a teacher's dashboard.