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I’ve found that Charts works quite well.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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ResearchKit
ResearchKit is an open source software framework that makes it easy to create apps for medical research or for other research projects.
Might want to check out ResearchKit. I haven't used it, but it does support bars and graphs
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Have you tried with https://github.com/misyobun/MSBBarChart? It may help you
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.