TEL AVIV—Beyond Verbal Communications Ltd., a voice-recognition software developer here, is rolling out an app promising something Siri can't yet deliver: a readout on how you're feeling.

Called Moodies, it lets a smartphone user speak a few words into the phone's mike to produce, about 20 seconds later, an emotional analysis. Beyond Verbal executives say the app is mostly for self-diagnosis—and a bit of fun: It pairs a cartoon face with each analysis, and users can share the face on Facebook or in a tweet or email.

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