Atomic Spectra is not free (it costs 9.99), however it doesn't contain in-app purchases or subscriptions.
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The price of Atomic Spectra is 9.99.
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This app does a brilliant job of representing elemental emission spectra. The figures look just like what I see in references and in museum displays. The app is fun to play with and explore various properties, too. Each element also is displayed with other useful info like atomic number, mass, and phase at room temperature.
