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We are working on something similar at StartHQ. In addition to listing which services any given company uses, we've also been thinking of listing the technologies the services themselves use, e.g. https://starthq.com/apps/?technology=mongodb

Is this something you'd find useful?

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Interesting yes. Useful.....not so much.

The ability to view a company's stack changes over time might prove more useful. For example, what stack did Company X use to get to 10k users, 100k users etc.

Given enough accurate data then it may be possible for a visitor to predict any performance bottlenecks that a technology may enforce over time and what technologies to use to mitigate said problems.

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