I’m a bit of a nerd and love the intersection of biology, physiology, spirituality and technology. The result is a growing collection of frequency machines, vagus nerve devices, wearables, and brainwave tools. Everything here is something I personally own, bought with my own money, and kept after testing. If I’ve written about it, that means I use it, rate it, and think it’s worth your time.
Brainwave Devices
Tools that let me steer brain state on demand — focus when I’m working, downshift when I’m fried, deep stillness when I’m meditating. Different methods (light, sound, PEMF, neurofeedback), same goal: reliable state control.
- Enophones — EEG-enabled headphones that surface a real-time “focus” score while you work. Not lab-grade meditation, but very useful for deep-work blocks without adding another device to your head.
- Mendi — NIRS neurofeedback for the prefrontal cortex. Short sessions train attention and self-regulation; progress graphs keep you honest. Great starter tool, better still when paired with slow breathing.
- Mindplace Kasina — Old-school light-and-sound entrainment. Pushes you into alpha/theta quickly; brilliant pre-meditation or for creative drift. Can be intense — eyes closed, go with it.
- NeoRhythm (OmniPEMF) — PEMF headband with programs for sleep onset, focus sprints and relaxation. Easy placement, dependable “nudge” without faff. Simple tap to operate function, battery lasts ages.
- Sens.ai — High-end headset combining neurofeedback, HRV coaching and brain stimulation/photobiomodulation. Structured programs and meaningful data; pricey, but it earns its keep.
Fitness Trackers
Wearables are the feedback loop. They keep training honest, recovery sane, and let you see if protocols actually move the needle over weeks and months.
- Amazfit Helio — Wrist strap for sleep, HRV and readiness. Cheaper than the usual suspects; solid daily read on recovery if you want minimal wrist clutter.
- Garmin Watch — Rock-solid GPS and multi-sport metrics with VO₂ max, training load and navigation. My go-to for runs, rides and hikes in all weather.
- Whoop — Continuous HRV, strain vs. recovery guidance, and the best sleep diagnostics I’ve used. Subscription model, not worth it for some.
Frequency Tools
The “sci-fi” shelf. Devices that broadcast fields or signatures (PEMF, scalar, EM) to shift physiology and mood. Not magic — levers. Used well, they complement the basics.
- Amofit S — Low-frequency EM targeting vagus tone and HRV. Subtle but consistent calming effect; easy all-day wear.
- HAELO — PEMF disc with preset programs for recovery, energy, sleep and stress. Clinical feel, plug-and-play, travels well.
- Hapbee — Wearable that mimics molecular “signatures” (e.g., caffeine, melatonin) via magnetic fields. Handy state nudges without stimulants or sedatives.
HRV Tools
If trackers give you the map, these are the microscope. Coherence training and accurate RR data to read (and improve) nervous-system balance.
- HeartMath — The classic coherence trainer. Breath-paced sessions that downshift stress fast and teach your system where “calm” lives.
- Polar H10 + Elite HRV app — Gold-standard chest-strap accuracy for morning readiness and session-by-session RR intervals. When I need data I can trust, I use this.
Vagus Stimulators
Direct lines into the parasympathetic system. These help flip you out of fight-or-flight and into rest-and-repair — crucial for sleep, digestion and emotional regulation.
- Nurosym — Auricular VNS with clinical chops. Strong, consistent effect on calm and focus; my “serious session” pick.
- Pulsetto — Consumer-friendly vagus stim that’s easy to build into daily routines. Less intense than Nurosym, great compliance.
- Sensate — Infrasonic resonance on the chest, paired with soundscapes. Odd for the first minute, then deeply settling — excellent for acute stress.
How to use this page: each device name links to a full review with what it does, how I use it, what it’s good for, and who should skip it.