These are two devices in the same class doing the same job. Both are radiofrequency microneedling: a grid of fine needles enters the skin and delivers RF heat beneath the surface. Secret RF is made by Ilooda in Korea and sold in the US by Cutera. Morpheus8 is InMode's.
The honest answer to "which is better" is that the operator, the settings and the depth used matter more than the badge on the machine. Energy per needle, depth, density and number of passes are chosen by the person treating you, and those choices drive both the result and the complication risk.
There are still real differences on paper. Secret RF runs at 2 MHz with a maximum of 25 W and a needle depth of 0.5 to 3.5 mm in 0.1 mm steps. Morpheus8 runs at 1 MHz with up to 65 W and, depending on the tip, reaches considerably deeper.
Neither is cleared for a single cosmetic use. Both clearances say electrocoagulation and hemostasis. So do most devices in this category.
Cleared June 2017 (K170325). Its predicate was another Ilooda device, Fraxis Duo.
Cleared December 2019 as "the InMode System with the Morpheus8 (Fractora) Applicators" (K192695) — it is the Fractora platform with deeper, insulated needles and a new name.
Whether the needles are insulated is not stated in the FDA summary. Cutera markets both semi-insulated and non-insulated tip options — that is a manufacturer claim, not a regulatory fact.
The pins are insulated. InMode's own operator manuals state they are coated except for the distal 0.5 mm, so heat is deposited at the tip and the top layer of skin is largely spared.
The number of needles per tip is not stated in the FDA summary.
Manufacturer labelling lists a 24-pin resurfacing tip fixed at 0.5 mm, a 12-pin Prime tip at 1 to 4 mm, a 24-pin standard tip at 1 to 7 mm and a 40-pin Body tip at 2 to 7 mm. The highest figure in any FDA summary is 7.0 mm.
The exact wording: "SECRET RF is intended for use in dermatologic and general surgical procedures for electro-coagulation and hemostasis." No wrinkles, no acne scars, no laxity, and no skin type statement of any kind.
Electrocoagulation and hemostasis in 2019; from July 2023 (K231790), procedures "where coagulation/contraction of soft tissue or hemostasis is needed." And a labelled limit: above 62 mJ per pin, the applicator is restricted to Fitzpatrick skin types I to IV.
Strip away the marketing and the list is short: frequency (2 MHz versus 1 MHz), maximum power (25 W versus 65 W), maximum depth (3.5 mm versus 7 mm at the top tip), tip range, and the fact that Morpheus8's insulation is documented in manufacturer labelling while Secret RF's is only claimed in marketing.
Everything else that determines your result is set on the day. Energy per pin, depth, density, number of passes and how the array is overlapped are operator choices. One published dose-response study found a very strong relationship between energy per needle and the volume of tissue coagulated, which is the clearest evidence available that settings, not brands, drive what happens in the skin. Two of that paper's four authors were affiliated with a device manufacturer, which is worth knowing.
Both devices are cleared under the same general electrosurgical category, with wording that says nothing about wrinkles, acne scars, laxity, stretch marks, cellulite or a double chin. That is true of most of the class: Potenza, Genius, Sylfirm X, Scarlet SRF, Agnes, PiXel8-RF and Exion's microneedling applicator all carry the same kind of generic wording.
A handful of competitors do carry a real cosmetic indication in their cleared text — Vivace and Virtue RF for facial wrinkles at 1 MHz only, and Profound for facial wrinkles and cellulite. If a clinic tells you a device is "FDA cleared for wrinkles," it is fair to ask which device and which handpiece, because for most of this category the answer is that it is not.
Treating off-label is legal, routine and not in itself a warning sign. The point is only that "FDA cleared" is not a claim about results.
A PubMed search for Secret RF returns no device-specific studies. A search for Morpheus8 returns 16 records with no randomised controlled trial. The RF microneedling literature that both are sold on was generated on other devices — Lutronic Genius and Infini, Jeisys, Pollogen, Lumenis and unnamed machines.
What that class evidence supports, honestly:
Ask what depth, what energy per pin, how many passes, and whether the tip is insulated. Ask what happens if you are unhappy at the four-week mark.
For deeper skin tones, ask about settings specifically. A systematic review of RF microneedling across Fitzpatrick III to VI found a low reported risk of scarring or pigmentation, but noted that much of the underlying evidence is weak — and lower energy, lower density and fewer passes are the standard adjustments.
One risk worth naming for either device: in FDA postmarket data covering 2013 to 2025, 114 reports contained 224 RF microneedling complication events, of which fat loss accounted for 26, or 11.6% of reported events. That is a proportion of voluntary reports with no denominator — it cannot be read as a per-patient risk — but it is the strongest published sign that unwanted fat loss after deep RF microneedling is a real phenomenon rather than internet rumour.
If you get cold sores, disclose it at booking, not on the day. Antiviral cover is started in advance. There is no cold-sore data specific to RF microneedling; the precaution is imported from laser resurfacing.