Skip to content
🍊 Digitize your offline data collection. Create your Assessments online with Tangerine Editor, conduct them offline with the Tangerine Android App. All results you collect can be exported as a CSV file, easy for processing in a spreadsheet. Tangerine has been used in over 1 million assessments and surveys in over 60 countries and in 100 languages.
TypeScript JavaScript HTML CSS Shell CoffeeScript Dockerfile
Branch: master
Clone or download
Type Name Latest commit message Commit time
Failed to load latest commit information.
.github Add PR Template to enhance documentation and help documentation writers Sep 3, 2019
client Fix form routing for archived and active forms Oct 16, 2019
docs Expand upon i18n developer docs Sep 26, 2019
editor increment t-f to 4.3.8 and t-f-e to 6.5.9 Oct 11, 2019
scripts Moved the class module in ./scripts/modules/ to ./server/src/modules/; Dec 18, 2018
server #1713 Add backwards data compatibility in CSV output for row marked t… Oct 11, 2019
.dockerignore Docker ignore node_modules for generate-csv and generate-uploads to a… Jul 26, 2018
.gitignore Merge pull request #1618 from Tangerine-Community/add-default-assets Sep 18, 2019
.travis.yml Move xvfb start command for travis to services section Oct 9, 2019 Update Oct 16, 2019 Create Jul 24, 2017 Update Sep 13, 2019
Dockerfile Bump base image to tangerine/docker-tangerine-base-image:v3.0.1 for c… Sep 19, 2019
LICENSE.txt License clarification Oct 26, 2016 Document defining version number with the command, document … Oct 5, 2019 pointing to specific branches for tangy-form and tangy-form-editor Jul 3, 2019 Add reference to case module in Jul 17, 2019 added gridAutoStopped and autoStop to csv output Aug 19, 2019 changes relating to the p2p plugin API Aug 8, 2019 enables use of T_ORIENTATION for pwa release Jun 3, 2019 Add /client endpoint in docker for client development Apr 21, 2019 Fix paths in express app for new location in src, new command… Apr 1, 2019
logo.svg Put logo in the root folder Apr 5, 2018
package-lock.json Using forms.json instead of curriculum.json Jul 30, 2018 Merge branch 'next' into acasi-v3 Jul 9, 2019 enables use of T_ORIENTATION for pwa release Jun 3, 2019



Build Status

Join the chat at

Digitize your EGMA and EGRA data collection with Tangerine™. Create your Assessments online, conduct them offline with the Tangerine Android App or any device with Google Chrome web browser. All results you collect can be exported as a spreadsheet. When you have updates to forms you can send out an Over the Air update. Tangerine has been used by over 60 organizations to conduct over 1 million assessments and surveys in over 70 countries and in 100 languages.

User Stories

  1. Subscription Owners use the Online Tangerine Hub App to create their own Tangerine Server which contains the online Tangerine Editor App. Tangerine is licensed as GNU GPL v3 and available to be installed on your own server.
  2. Form Designers use Tangerine Editor App to create forms and send those forms as Tangerine Client Apps to their Assessors.
  3. Assessors use Tangerine Client Apps to collect form responses while offline and later when online they upload form responses to Tangerine Editor.
  4. Form Designers download form responses as CSV. Other optional reporting modules include logstash module for building dashboards with Elastic Search and Kibana as well as the Dat Output module for sharing data on the P2P Dat Network.
  5. Form Designers send out updates to forms as an Over the Air update to Tangerine Client Apps.

Technical details

A Tangerine Server can either be purchased online at Tangerine Hub or set up on your own server by following the instructions in the file found in the Open Source Tangerine repository on Github. The Tangerine Editor App is deployed using Docker and built with Node.js, Express.js, Angular, Web Components, and CouchDB. The Tangerine Client app, which the Tangerine Editor App releases, can be released either as a Progressive Web App (PWA), downloadable Android App (APK), or Dat Archive for use on the experimental Beaker/Bunsen Browsers. The Tangerine Client App is built using Angular, Web Components, and PouchDB. All options for releasing are enabled to receive Over The Air (OTA) updates for form content and application updates with the Dat option having experimental support for syncing OTA updates between devices while offline.

Forms in Tangerine are based on the tangy-form suite of Web Components ( Forms can be edited in the online Tangy Editor App on their Tangerine Server using a WYSIWYG interface or for advanced editors, via basic HTML and Javascript code.

There is a pluggable reporting module framework built in currently with options to send outputs to CSV, Elastic Search, and Dat Archives. Dashboards are typically built using the "ELK" stack which is short for a combination of technologies known as Elastic Search, Logstash, and Kibana.

Supported Devices and Web Browsers

Online Editor for Form Design and Data Download

Currently Tangerine Editor is tested using Google Chrome web browser. Other Web Browsers such as Firefox and Edge may work, but may also give you trouble.

Offline Tablet for data collection

Currently the most commonly deployed tablet with Tangerine is the Lenovo Tab 4 8. Technically any Android tablet with an updated version of Chrome should work but due to the varied nature of Android distributions out there, we cannot guarantee Tangerine will work on all Android tablets.


Online Editor for Form Design and Data Download

We recommend using AWS for hosting have documented detailed instructions for AWS. Below are general instructions for installing on any machine.

SSH into your machine from a terminal, install Docker, and then run the following commands. You'll need the version of the most recent release. Find that on the releases page here.

# Get the software.
git clone
cd tangerine
# See releases tab on github for versions.
git checkout <version tag>
# Create and edit to match your desired settings. Make sure to set `T_CONTAINER_NAME` to the same as what `<version tag>` in the prior commands.
# Start the software.

If your server restarts or the container stops, you can later run the ./ script in the Tangerine folder.

To use SSL, put an SSL enabled Reverse Proxy in front of Tangerine and set the T_PROTOCOL variable in to https before running Note that in order to publish Tangerine for data collection using the Web App method (PWA), SSL is required. At RTI we use AWS's Elastic Load Balancer in front of Tangerine because it automatically renews and cycles SSL certificates for us. How to set this up is detailed in our instructions for AWS. If your Tangerine install is on a Digital Ocean Droplet, you can use their Load Balancers and configure them for SSL. See How To Configure SSL Termination on DigitalOcean Load Balancers. Now visit your Tangerine installation at the IP address or hostname of your installation. In this configuration, the browser talks to the Load Balancer securely on Port 443 while the load balancer communicates with Tangerine Container on port 80 on a private network.

Lastly, to reset caches and free up memory every so often, we recommend restarting the server every evening using cron to automate it. As a user with docker permission on the command line run crontab -e and add the following line.

0 0 * * * docker stop tangerine && docker start tangerine

Offline Tablet for data collection

To install on Tablets, proceed to the "Releases" tab in the Online Editor. There you will find two methods for installing on Tablets, Web Browser Installation and Android Installation. Each of these release types have two different channels you can publish to, Test and Live. It is recommended that for every deployment of Tangerine you have at least one designated device subscribed to the Test channel so that you may release to that Device to test Tangerine upgrades and content updates before releasing to the remaining tablets subscribed to the Live channel.

  1. On Tablet, open the Play Store app and proceed to upgrade Google Chrome Web Browser.
  2. On Server, generate release in Online Editor.
  3. If using Web Browser Installation, ensure the Tablet is connected to the Internet, open the URL the server gives you in Google Chrome, wait for installation screen to complete, and then tap "Add to homescreen" to add the App to your device. If using Android installation download the "APK" file, transfer to the device and open the file to install.
  4. If using the Android Installation, on the Tablet proceed to the Settings App and open "Apps & notifcations", then "Tangerine", then "Permissions". Ensure that "Camera", "Location", and "Storage" permissions are enabled.


When you start Tangerine, it creates two containers that need upgrades over time. The tangerine container and the couchdb container.

Server Upgrades

Monitor for new stable releases. Note that a "Pre-release" may not be stable, might corrupt your data, and there will not be an upgrade path for you.

SSH into your server and run the following commands.

cd Tangerine
git fetch origin
git checkout <version tag>
# Set up again.
cp config.sh_backup
# Migrate settings from config backup to
vim -O config.sh_backup
rm config.sh_backup
./ <version number>
# Check for upgrade scripts that need to be run. Note that you can only run scripts that end in .sh and you need to 
# run every script between your prior version to version you have upgraded to. Also always check the release notes for
# any special instructions
docker exec -it tangerine ls /tangerine/upgrades
# Run an upgrade script indicated in release instructions.
docker exec -it tangerine /tangerine/upgrades/<version>.sh
# Remove the previous version of tangerine you had installed.
docker rmi tangerine/tangerine:<previous tag>

Note that if you have created groups already and you are now updating T_HOST_NAME or T_PROTOCOL in, you will manually need to edit the settings docs in each group. See issue #114 for the status of this.

CouchDB Upgrades

Periodically CouchDB will issue security vulnerability fixes. Subscribe to their blog to be notified of releases ( and then run the following commands.

docker pull couchdb
cd tangerine

Tablet Upgrades

For the app on the tablet, wether you are using the Android Installation method or the Web Browser installation method, the update process is the same. After server upgrades or content changes, return to the "Releases" tab in the online Editor and click "Test Release". When that completes, fetch your designated test tablet. Ensure you have an Internet connection on your designated test tablet, open the app, log in, and from the top right menu select "Check for Update". Follow the prompts to update. If the updates are satisfactory, return to your "Releases" tab online and click "Live Release". Proceed to update your Tablets with the "Live Release" app.

Local Content Development

Install nodejs and git on your local machine. Then run the following commands.

git clone
cd tangerine
git checkout <most recent release version, ie. v3.0.0-rc5>
cd client/app
npm install
npm start

Then open http://localhost:4200 in your web browser. The content is found in the tangerine/client/app/src/assets directory. You can edit the content there or replace it with your own content repository. You can find a video tutorial on this process here.

If the process has stopped, you can restart by running...

cd tangerine/client/app
npm start

To update to a new version of tangerine, run...

cd tangerine
git fetch
git checkout <new version listed in the releases tab on github>
cd client/app/
rm -r node_modules
npm install
npm start

App Development

Develop for Editor and Server

git clone
cd tangerine

Now open http://localhost/ in your web browser. To debug the node.js server, install NiM, open it through your devtools and connect to port 9229.

Develop for Client

Prereqs include node 8+ and npm install -g @angular/cli.

git clone
cd tangerine/client/
cp -r default-assets src/assets
npm install
npm start

View the app at http://localhost:4200.

If you are also developing the form library Tangy Form at the same time, you can symlink that repository into node_modules folder. For example...

rm -r node_modules/tangy-form
ln -s /Users/rjsteinert/Git/tangerine-community/tangy-form /Users/rjsteinert/Git/tangerine-community/tangerine/client/app/node_modules/tangy-form

It's nice that the Angular webpack dev server will reload your browser when making changes in the symlinked tangy-form folder.

Trademark and License

Tangerine Logo is a registered trademark of RTI International. This software is licensed under the GPLv3 License.

You can’t perform that action at this time.