Ocsigen Start 
You can try the online version and download the Android application.
Introduction
Ocsigen Start is a set of higher-level libraries for building client-server web applications with Ocsigen (Js_of_ocaml and Eliom). It provides modules for
- user management (session management, registration, action — e.g., activation — keys, ...),
- managing groups of users,
- displaying tips, and
- easily sending notifications to the users.
Ocsigen Start comes with an eliom-distillery template for an app
with a database, user management, and session management. This
template is intended to serve as a basis for quickly building the
Minimum Viable Product for web applications with users. The goal is to
enable the programmer to concentrate on the core of the app, and not
on user management.
If Ocsigen Start corresponds to your needs, it will probably help you a lot. If not, start with a simpler template. You can still use the modules from Ocsigen Start.
Installation
We recommend using OPAM to install Ocsigen Start. Here is the command:
opam install ocsigen-start
Create your project
eliom-distillery -name myproject -template os.pgocaml
To get started, take a look at the generated README.md.
You have also the complete manual and API available on the Ocsigen website