CityMapper "has topped download charts despite spending nothing on marketing" - all about the UX, like @aral says. Now what's the biz model?
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Replying to @JanetGunter
@JanetGunter Unfortunately, I believe it’s a free app (see my talk from this month at The RSA at http://indietech.org )1 reply 0 retweets 0 likes
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