CityMapper "has topped download charts despite spending nothing on marketing" - all about the UX, like @aral says. Now what's the biz model?
@JanetGunter Unfortunately, I believe it’s a free app (see my talk from this month at The RSA at http://indietech.org )
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@aral I know but it is too good to resist. There's the rub. - End of conversation
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