Table 5.

Themes, subthemes, and quotes from interviews and focus group.

Themes and subthemes		Quote No.	Verbatim examples
Key theme 1: Design features
	Overall design, navigation, and ease of use	1	“I was really pleasantly surprised with it…It was great and I can definitely see people using it and wanting to use it. I was very impressed with it. Yeah, I wish I could criticise a bit more, but I can’t.” (19-year-old female)
		2	“[It’s] accessible to a whole range of people…[They] very quickly understand where they needed to go.” (Mother of a 15-year-old female)
	Interactive elements and personalization	3	“It was good to be able to see how you’ve been each day…It’s just helpful to track, that’s not something I would usually do.” (19-year-old female)
		4	“That was really helpful for myself because I've been trying to get out of the house and do more…That was one of my favourite parts…It's quite motivating.” (16-year-old female)
		5	“I like the fact that there was space for the young person to add their own contacts, so they then had ownership of it; it’s given them a bit of responsibility.” (Primary mental health worker: female)
	Illustrations and animations	6	“I think the illustrations…are very good…it’s not a chore to go and look at the website…It’s not that it’s childish, but…it’s less serious, I think it’s easier to use.” (16-year-old female)
Key theme 2: Sections, content
	Language, tone, and amount of information	7	“It's not too complicated, so teenagers can understand it and relate to it…There's no ridiculously big words and [it’s not too] scientific. It's a good style of writing to keep teenagers reading.” (17-year-old female)
		8	“We’ve got to be careful not to lower it too much because they’ve actually got onto this website because they’re needing information.” (Educational psychologist: female)
	Personal stories	9	“I do like the personal stories because then you feel like you're not the only person that’s going through a hard time. You can maybe relate as well.” (16-year-old male)
	Sections	10	“I’ve used it a lot since being diagnosed and it helps me to understand what depression is and some of the reasons.” (15-year-old female)
		11	“It's not something, especially if you're in a really low mood, you particularly want to think about…It's just talking about things that you try and avoid basically.” (16-year-old female)
		12	“What’s really good is it’s relevant…it can be due to all sorts of different things so… for a young person coming to realize actually it’s not just about me and now and just one thing.” (Psychiatrist: female)
		13	“The sections I went to is perfect, it’s exactly how I imagined it to be, like self help, I particularly like that section.” (16-year-old male)
		14	“My only concern with that is you run the risk then of the people who are a bit paranoid is self‑diagnosis…and become panicky and anxious.” (Mother of a 17-year-old female)
		15	“What I really liked about it is that the fact that it’s talking more about the family… It’s recognizing that the children’s mental health difficulties don’t come in isolation.” (Psychiatrist: female)
		16	“From a friend’s perspective, it’s quite difficult to start a conversation about depression.” (14-year-old-male)
Key theme 3: Integration and context
	Targeted versus universal	17	“Whoever looks at it it’s gonna be beneficial. There’s a lot of information on there that even if you haven’t got a mental health problem or maybe you know someone or even if you’re just curious.” (19-year-old female)
	Use with families, carers, and friends	18	“In mine and my friends’ experiences, the hardest people to talk to would be parents, so I like this because it’s a way that you can use the account separately, but learn the same things.” (15-year-old female)
	Integration with services	19	“It’s there to back it up at home...So between the sessions you’ve got this at home to use…. A safety net or when I stop CAMHS sessions then it’s just there when I need it.” (14-year-old female)
		20	“A big part of our work is psychoeducation and so it would be great to know that there’s a reliable, moderated place that you can send them, because at the moment we tend to use sites that are adult-based and we’re having to cut and paste.” (Psychiatrist: female)