Where they overlap
Both run Whisper-based dictation entirely on your Mac. Both work offline. Both support multiple languages. If you only want transcription, both work great.
Where they differ
Superwhisper is dictation-only. Jarvis is dictation + voice control + memory + routines. Saying "open Slack and reply to the design channel" works in Jarvis, not Superwhisper.
Pricing
Superwhisper: $8.49/month or $84 lifetime. Jarvis: free, open source, no tier upgrades.
Multi-language
Superwhisper supports 100+ languages today. Jarvis supports 30+ and is expanding. For long-tail languages, Superwhisper edges ahead.
Which to pick
If you only need transcription in an uncommon language, Superwhisper. If you want a voice-first AI that controls your Mac and remembers what you tell it, Jarvis.