Table 3.

Specific responses from the vaccinator interviews, organized by theme.

Theme	Examples of vaccinator responses
Acceptability of the app: Operability	“It is very easy to use, just like my own phone that I use, typing information on the phone is easy too... and we already knew how to take a picture and upload it...”
	“I never lose any of the data now, as the data is entered then and there in the outreach, ...first we used to write it on a piece of paper and bring it home and then enter it the next day at the health facility...there was a huge chance of error... “Teeko” data is very reliable data”
	“The application can save my data until I get internet signals but still, to avoid error due to this in future, a better connectivity in remote areas is needed...”
	“It’s been two years now, mobiles phones should be replaced with new ones, ... they hang and shut down at times... Taking more time to make an entry in the field or transfer the data...”
Validity of the app data	“It is easy for me to find children who are overdue for their vaccination, I can see the due date for the next vaccination and reach the child”
Use of the app data	“The district administration has become more watchful and alert now... they can catch us not being in the field through their mobiles. now I believe that I am performing my duty with more honestly than I used to previously...”
	“During the last award ceremony, I was awarded first position by district-AKU team; my data recorded on “Teeko” application in the field also completely matched the manual data...I was overwhelmed”
	“I have been working for the last 35 years as a vaccinator and I feel that these two years were the ones where I performed my best. I feel very proud of myself”
	“Very easy application, but with manual (entry of records), it doubles my work; we have to make entries in both EPI (paper) registers and “Teeko”; this takes a lot of time”