Not OP, but have a look at [0]. It’s not great, but good enough. I regularly use it for App Store screenshots with captions and text. [0] https://theapplaunchpad.com/. - Source: Hacker News / about 1 year ago

For an advanced approach that includes localizations of your text and a ton of included resources to build your designs off of, there is AppLaunchPad (which has both a screenshot version and a mockup version with free and pay-by-the-month options), there is Vernissage which has a free and a pretty cheap pro version, and then there's App-Mockup which is free web-app. Source: over 1 year ago

I used this. Paid for one month and got a good use out of it. https://theapplaunchpad.com. Source: over 2 years ago

I used AppLaunchPad. It’s a paid service but you can go monthly for single months when you need it (US$ 29). And you can easily wrap device frames for different size and colors of iPhone and iPad around the standard screenshots that you supply. Source: almost 3 years ago

Iconscout - A list of high-quality free vector Icons, Illustrations, 3D assets, and Lottie Animations. - Source: dev.to / 9 months ago

Iconscout : Over 2.2 Million+ Design Assets, Curated SVGs, Vector Icons, Illustrations, 3D graphics, and Lottie Animations. Over 3000+ assets added every day. Integrated plugins, tools, editors, and more. - Source: dev.to / over 1 year ago

Https://iconscout.com/ is what I use because you can edit the icon colors before you download them. Source: over 2 years ago

After the 2,3 days of sleepless nights here is my webpage. It's my first website, completely written in HTML, javascript, CSS. It is built in such a way that it is compatible for any type of screen. Icons are from https://iconscout.com. Fonts are from Google fonts. Https://jeeson-k.github.io/jeeson/. - Source: dev.to / over 2 years ago

For the first question, it depends on the project and targets users, the environment which belongs to, for the icons from here https://iconscout.com/ - and here https://icons8.com/. Source: over 2 years ago