How we ranked them
Every device was scored against ONDA's published review methodology: six weighted criteria, with evidence and clinical backing carrying the most weight because the field is full of marketing claims weakly tied to what the hardware actually does. The overall score is the weighted mean — not a number picked by feel.
All ten devices were assessed from manufacturer documentation, published trial records, regulatory clearances and independent 2026 reviews rather than hands-on testing, so treat the scores as an evidence-based starting point.
The short version
The field splits cleanly into four mechanism classes, and the right pick depends mostly on what you want the stimulation to do.
Electrical auricular tVNS (ear clip): Nurosym, Vagustim, Xen by Neuvana. The deepest research base on the consumer side belongs to Nurosym; Vagustim is the protocol-rich EU alternative; Xen is the familiar form factor.
Electrical cervical tVNS (neck or handheld): gammaCore Sapphire CV (prescription, FDA-cleared, headache-indicated), Truvaga 350 (consumer, same hardware platform), Pulsetto (consumer collar, broad protocol library), Hoolest VeRelief Prime (handheld, athletic recovery).
Vibrotactile / mechanical: Apollo Neuro (wrist/ankle band, daily wear), Sensate (chest pebble, infrasonic, paired with soundscapes). Not electrical tVNS in the strict sense; both have peer-reviewed HRV evidence.
Implanted: LivaNova VNS Therapy. The medical gold standard, included as reference rather than recommendation.
If the deciding criterion is evidence, choose Nurosym. If it is daily wearability, Apollo Neuro. If you need prescribed clinical use, gammaCore. If price is the constraint, Pulsetto. The category is small, the differentiation is real, and the scoring above maps directly onto which trade-off matters to you.