There are 4 ways you can use Enketo:
Simply pick a tool that has Enketo Smart Paper built-in. This is usually the best option.
Enketo is 100% free and open source. Look into installing it yourself and ask for support from other users in the user forum. Consider funding Enketo's further development of new features and fixing of bugs.
If the in-house expertise to reliably run Enketo is not available, consider hiring an organization to do this for you. (Enketo LLC is not available for this kind of work, only for software development.)
If you are able to run your own form/data server (e.g. ODK Aggregate, Formhub, Ona, KoBoToolbox) but do not have the expertise to run an Enketo server, consider using the paid enketo.org service and link it with your server.
The Enketo project is brought to you by Enketo LLC with the generous support of its partners and sponsors:
Enketo LLC is based in Denver, CO (USA). Its mission is to develop advanced offline-capable web tools for people working in conditions where Internet access is intermittent.