I've been running a mobile and web design and development company for more than 3 years now, and - as also the lead of sales - I often hear the following question: "I want to build Uber (or WhatsApp, Airbnb, etc), but a bit different. How much would it cost?".

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The UX List
The UX List
6 months ago

Nice framework you provided for making estimates. Reminds of the questionnaire from Crew: http://howmuchtomakeanapp.com/