Electronic Field Notebooks

EFN is the official provider of Fieldmark™. We are committed to bringing the best offline-capable mobile field data collection app to researchers working in all disciplines, in all locations, across the globe.

Electronic Field Notebooks


Custom enterprise packages suitable for large businesses and institutions A custom applicati...


Entry-level hosting package suitable for individual researchers and sole contractors Use up ...


Team hosting package suitable for research teams and small businesses Connect up to 10 devic...

Built by researchers, for researchers logo

Built by researchers, for researchers

We've been building mobile apps for data collection since 2012. We use them too!
FAIR Data logo


We love Findable, Accessible, Interoperable and Reusable (FAIR) data. We built Fieldmark™ to make it easier to collect FAIR data, your way.
Proudly open source logo

Proudly open source

Fieldmark™ is shared under an Apache 2 license so you can see all the code that makes the magic happen.