Inclusion Criteria:  diagnosis of interstitial lung disease Forced Vital Capacity ≥50% predicted (at most recent in-clinic spirometry test) owns a smartphone or tablet device has a mobile telephone number, email address and access to internet at home willing to allow home monitoring of their health including spirometry and pulse oximetry data understands how to use mobile technology (e.g. has downloaded and used other "apps" on their mobile device; uses email) demonstrates willingness to measure spirometry and pulse oximetry daily for the duration of the study fluent in English language Written informed consent.  Exclusion Criteria:  serious concomitant conditions which place the patient at high risk of respiratory distress, making them unsuitable to be managed at home confusion which would limit the patient's understanding of the project or the measurement procedures current or recent (within last 6 weeks before baseline) participation in another clinical research project.