Table 3.

Qualitative themes uncovered and example quotes regarding HealthySMS’s feasibility

Theme	Example quote supporting feasibility	Example quote about limited feasibility
Text modality	“I am not really great with the emails. I think just going through texts is almost always better.”	“For a while, I just didn’t even open the texts.”
Consistency of delivery	“I always got the text and sometimes if I didn’t reply, like with my mood, I would get like a reminder, maybe 10 minutes later, respond your mood. So I would say technically or technologically, it was all good. I didn’t run into any issues.”	“Sometimes my mood ratings just wouldn’t come in. Like some days, like towards the ending of it, they just came in periodically like not every day.”
Amount of effort to use	“[It was fine to] like, give a number, how was your day? But if it was like kind of describe your day, I don’t think anyone would want to do that because it would take too long.”	“If you didn’t like type in your mood right away, it would like send you a reminder a lot. So I got those a lot if I wasn’t doing it.”
Timing of texts	“I definitely didn’t get anything like super early or late. I would say they did a pretty good job of, like, changing up time, so it wasn’t like the same time every like 8AM and 10PM, like it was pretty good at switching up times so you could get like different times of the day.”	“I guess sometimes they came at weird times, like really early in the morning or really late at late night...It kind of felt less helpful if they came later in the day because either I had already figured it out or like got past it or it just didn’t help anymore.”
Amount of texts	“I don’t remember getting, like, bombarded with them. So I would say the amount is probably pretty good and reasonable.”	“It felt sometimes like it was getting too many. But that was mainly because that was like at a time when I didn’t need them and so it just felt like a waste of message if that makes sense.”
Text length	“They’re all quick...It’s short and simple and sweet...”	“I liked it, but it was also like kind of a lot sometimes.”