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Sapelli is a mobile data collection and sharing platform designed with a specific focus on non-literate and illiterate users with little or no prior ICT experience.

It supports the creation of surveys (called "projects"), composed of 1 or more forms. Forms can be entirely text-free, using the concept of pictorial decision trees, or have a more conventional appearance consisting of standard UI widgets. Sapelli supports data exchange using a highly efficient protocol that can work across SMS and HTTP.


Sapelli is being developed by the Extreme Citizen Science (ExCiteS) research group at University College London (UCL), with help from outside partners & contributors.

Currently the core Sapelli team consists of:

Former contributors:

Legal disclaimer

Copyright 2012-2016 University College LondonExCiteS group

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.