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MVP concept works well both for web and for mobile apps. However, creating web and mobile versions simultaneously doesn’t fit well into MVP approach.
When building an MVP you should decide which platform — web or mobile — is more suitable for checking your app idea with some early adopters and getting their feedback. Building an MVP is like running a set of experiments and every new experiment makes the app more adjusted to the users’ feedback, more mature — and hence more viable.
If you build your MVP on web and mobile platforms at once, it will require too many efforts to adjust both web and mobile apps to the users’ feedback at every iteration.