Is there a possibility of an App that our labour subbies could use to record what they are doing and submit their applications to us?

We are finding that inputting all the individual labour claims into Chalkstring every week, can be a time consuming task for someone in the office, so would like the lads to be able to input the information directly into the project themselves from their phones, and then we would just need to check and approve it in the review process. An app would mean the lads could do their own admin and save us lots of time.