The short version
The three devices solve different jobs. Pulsetto is the daily-use cervical tVNS collar with guided programmes; Nurosym is the clinical-grade auricular tVNS with the deepest evidence; Apollo Neuro is the all-day passive vibrotactile wearable. They are not really substitutes — they layer.
When Pulsetto is the right pick
If you want a polished daily-use device with structured sleep, stress, anxiety and pain programmes, and cervical electrical tVNS is the mechanism you want, Pulsetto is the right shape. Most consumer first-time users land here because the form factor and the price are accessible.
When Nurosym is the right pick
If peer-reviewed evidence and disclosed stimulation parameters are the deciding criteria — you are running self-experiments, want to cite the literature, value clinical provenance — Nurosym is the right shape. The Parasym hardware has the deepest published auricular tVNS research base in the consumer space.
When Apollo Neuro is the right pick
If you want vagal modulation that runs in your day without ceremony — at work, during sleep, in training — Apollo is the right shape. The vibrotactile mechanism is indirect but real, the University of Pittsburgh evidence is solid, and the device is genuinely wearable 24/7.
The layered case
Apollo as the daily passive baseline plus Pulsetto or Nurosym for targeted acute sessions is the most common multi-device configuration among serious users. The mechanisms hit different pathways, so the effects stack rather than redundant.