Thermage FLX vs Ultherapy Prime in Seoul: Which Suits You?

Thermage vs Ultherapy is one of the most common comparisons people make before booking a lifting treatment in Korea. Both are non-surgical, both are popular in Seoul, and both are often described as “lifting.” So which one fits your face? Does it depend on whether your skin feels loose or looks like it’s sagging? And can you have both in one visit?

This guide compares Thermage FLX and Ultherapy Prime in plain language. We explain how each device works, which layer of skin it targets, how often people typically repeat it, and what the packages cost at YEPIDA Clinic, an aesthetic clinic in Sinsa-dong, Gangnam. We don’t rank one above the other. The two devices work differently, and the right choice depends on your skin, which is why the final plan is made with a physician at consultation.

Thermage FLX vs Ultherapy Prime: Quick Comparison

Item	Thermage FLX	Ultherapy Prime
Energy type	Monopolar radiofrequency (RF)	High-intensity focused ultrasound (HIFU)
Main target layer	Deep into the dermis (the layer beneath the skin’s surface)	From the dermis down to the SMAS (the deeper support layer under the skin)
Depths	Delivered through the dermis	Three depths: 1.5 mm, 3.0 mm and 4.5 mm
Typical goals	Fine lines, skin texture and firmness	Lifting sagging cheeks, deeper wrinkles, helping prevent sagging
Device features	33% larger Total Tip, about 25% shorter treatment time, AccuREP auto-tuning, vibration and cooling	35% larger screen, upgraded DEEP SEE imaging, shorter treatment time
Treatment areas	Full face; eye area (Eye Thermage FLX)	Face; eye area (Eye Ultherapy)
Typical interval	About every 6–12 months	About every 6–12 months
Comfort and downtime	Varies from person to person; your physician will explain what to expect at consultation

The Short Answer: Loose Skin or Sagging Skin?

If you only read one section, read this one. The simplest way to think about Thermage vs Ultherapy is to ask which layer your concern comes from.

• Thermage FLX works closer to the surface, in the dermis. It is commonly considered when the concern is laxity: skin that feels thinner or less firm, fine lines, or uneven texture.
• Ultherapy Prime reaches deeper, down to the SMAS layer. It is commonly considered when the concern is sagging: cheeks or the jawline that have started to drop.

A rule of thumb often cited in Taiwanese beauty guides puts it this way: loose skin points toward radiofrequency, and sagging skin points toward ultrasound. It’s a helpful starting point, not a diagnosis. Many faces show both laxity and sagging, and in different areas. That’s why a physician looks at your skin directly before recommending one device, the other, or a combination.

How Each Device Works

Both devices use heat to encourage the skin’s own collagen response, but they deliver that heat in different ways and to different depths.

Thermage FLX: radiofrequency to the dermis

Thermage FLX uses monopolar radiofrequency (RF) energy. The energy is delivered deep into the dermis, where it is intended to induce collagen contraction and renewal. The aim is to improve fine lines, skin texture and firmness.

Thermage FLX is the fourth-generation version of the device. According to the clinic’s device information, it has these features:

• Larger Total Tip: the tip covers a 33% larger area, which shortens treatment time by about 25%.
• AccuREP technology: the device automatically tunes each shot so energy is delivered accurately.
• Vibration and cooling: multi-directional vibration and cooling are designed to protect the skin and reduce discomfort.

Ultherapy Prime: focused ultrasound from dermis to SMAS

Ultherapy Prime uses high-intensity focused ultrasound (HIFU). The ultrasound energy is concentrated at a specific depth under the skin, where it creates small thermal coagulation points (tiny, targeted zones of heat). Because it can work from the dermis down to the SMAS, it is aimed at lifting sagging cheeks, softening deeper wrinkles and helping prevent sagging.

Ultherapy Prime works at three depths, each with a different purpose:

• 1.5 mm: the epidermis and upper dermis, for fine lines and pores
• 3.0 mm: the deep dermis, for collagen renewal and firmness
• 4.5 mm: the SMAS layer, for lifting and sagging

Compared with the previous version, Ultherapy Prime has a 35% larger screen and upgraded DEEP SEE imaging. This lets the practitioner see the treatment area on screen while treating. The device is also designed for shorter treatment time and less discomfort.

What Each Treatment Feels Like

Comfort is one of the first questions most people ask, and it’s also one of the hardest to answer in general terms. How a treatment feels depends on your skin, the area, the energy level and your own sensitivity.

Here is what we can say based on the device design. Thermage FLX uses vibration and cooling intended to protect the skin and reduce discomfort, and the clinic’s device information lists minimal discomfort and a quick return to daily life among its goals. Ultherapy Prime is designed to shorten treatment time and reduce discomfort compared with the earlier model.

Recovery also varies from person to person. After either treatment, follow your physician’s aftercare instructions, which may include keeping skin moisturized, using sun protection, and avoiding saunas and alcohol for a period. If you are traveling, share your flight dates at consultation so your physician can factor them into the plan.

Can You Combine Thermage FLX and Ultherapy Prime?

Yes. YEPIDA Clinic offers combination packages that include both devices. Because Thermage FLX and Ultherapy Prime work on different layers, some people plan them together: radiofrequency for the dermis, and focused ultrasound for deeper layers down to the SMAS.

This fits the clinic’s Design Lifting approach, where physicians combine devices 1:1 based on your skin condition, the area you want to address and your goals. A combination isn’t automatically the right choice for everyone. Whether you need one device or both, and how many shots of each, is decided with your physician after looking at your skin.

How Often Are Thermage and Ultherapy Repeated?

According to the clinic’s device information, both Thermage FLX and Ultherapy Prime are typically repeated about every 6–12 months. The interval that suits you can depend on your skin, your age, your goals and how your skin responds. Your physician can suggest a schedule at consultation, which is especially useful if you visit Seoul regularly.

Genuine-Certified Packages at YEPIDA Clinic

Many visitors to Korea want to know whether the device and tips used are genuine. At YEPIDA Clinic, Thermage FLX and Ultherapy Prime are offered as genuine-certified packages; they appear on the clinic’s price list under “Genuine-Certified Thermage” and “Genuine-Certified Ultherapy.”

If you have questions about how the tip and shot count are confirmed for your treatment, you can ask during consultation.

Thermage vs Ultherapy Price at YEPIDA Clinic

The packages below come from YEPIDA Clinic’s price list. Each package includes post-treatment care steps as well as the device treatment.

Package	What’s included	Price (KRW)¹
Genuine-Certified Thermage FLX 600 shots	Thermage FLX 600 shots + Therfect rubbing (3 min) + peel care + LDM (6 min) + hydro soothing mask + LED	KRW 1,799,000
Genuine-Certified Thermage FLX 900 shots	Thermage FLX 900 shots + the same care steps	KRW 2,649,000
Genuine-Certified Ultherapy Prime 300 shots	Ultherapy Prime 300 shots + Therfect rubbing (3 min) + peel care + QUS water-drop ultrasound (6 min) + hydro soothing mask + LED	KRW 1,040,000
Genuine-Certified Ultherapy Prime 600 shots	Ultherapy Prime 600 shots + the same care steps	KRW 1,985,000
Combination: Thermage FLX 600 + Ultherapy 300	Thermage FLX 600 shots + Ultherapy 300 shots + Therfect rubbing (3 min) + peel care + LDM (6 min) + hydro soothing mask + LED	KRW 2,789,000
Combination: Thermage FLX 600 + Ultherapy 600	Thermage FLX 600 shots + Ultherapy 600 shots + the same care steps	KRW 3,399,000

¹ Prices include VAT. Approximate USD, in table order: USD 1,350 / USD 1,980 / USD 780 / USD 1,490 / USD 2,090 / USD 2,550. Approximate conversions based on the KRW base exchange rate as of 2026-10-12 (USD 1 = KRW 1,335.30). Actual payment is made in KRW, and prices may change. Based on the October 2026 price list.

Other options on the price list include Eye Thermage FLX, larger Ultherapy Prime packages (900 shots) and a larger combination package (Thermage FLX 900 + Ultherapy 900). The number of shots you need depends on your face and goals, so your physician will suggest a shot count at consultation.

Thermage or Ultherapy: Questions to Bring to Your Consultation

A consultation is where the comparison becomes personal. To make the most of it, it can help to think through a few questions beforehand.

What bothers you most when you look in the mirror?

If it’s fine lines, texture or skin that feels less firm, mention that. If it’s cheeks or a jawline that seem lower than before, mention that too. Describing the concern in your own words helps the physician match it to a skin layer.

Which areas do you want to address?

Both devices can be used on the face and the eye area. Let your physician know if the eye area is a priority, since Eye Thermage FLX and Eye Ultherapy are separate options.

What does your schedule look like?

Share your arrival and departure dates, and any plans after treatment. Your physician can take your schedule into account when explaining aftercare.

How to Book a Consultation at YEPIDA Clinic

YEPIDA Clinic is an aesthetic clinic and a Korea-registered medical institution for international patients. It is on the 6th floor of ICT Tower, 624 Gangnam-daero, Sinsa-dong, Gangnam-gu, about a 1-minute walk from Exit 6 of Sinsa Station (Line 3 and Shinbundang Line).

• Hours: Mon–Fri 10:00–20:30; Sat 10:00–16:00; Sun and public holidays 10:00–16:00; no lunch-hour closure
• Booking: appointment-first, so booking in advance is recommended
• Phone: +82-2-6952-2586
• Website: yepida.kr

Consultations take place one-to-one in a private room. When you get in touch, it helps to share your main concern, the areas you’d like to treat and your dates in Seoul.

Frequently Asked Questions

Is Thermage or Ultherapy better?

Neither is simply better. They work on different layers. Thermage FLX uses radiofrequency in the dermis and is commonly considered for laxity, texture and fine lines. Ultherapy Prime uses focused ultrasound down to the SMAS and is commonly considered for sagging. Your physician will recommend an option after assessing your skin.

Can I have both Thermage FLX and Ultherapy Prime?

YEPIDA Clinic offers combination packages that include both devices, because they target different layers. Whether a combination suits you, and the shot count for each device, is decided by your physician at consultation.

How long should I wait between sessions?

Both Thermage FLX and Ultherapy Prime are typically repeated about every 6–12 months. Your physician can suggest an interval that fits your skin and goals.

Are the packages at YEPIDA Clinic genuine?

Thermage FLX and Ultherapy Prime are offered as genuine-certified packages at YEPIDA Clinic. If you’d like to know how the tip and shot count are confirmed, you can ask during consultation.

Is there a consultation fee?

If you visit on the day and receive a consultation only, without having a treatment, a consultation fee of KRW 50,000 applies.

Is sedation available?

Under the clinic’s deposit policy, a deposit of KRW 220,000 applies for sedation when the treatment cost is KRW 2,000,000 or more. Please ask at consultation whether sedation is appropriate for your plan.

How much downtime should I expect?

Downtime and comfort vary from person to person. Your physician will explain what to expect for your treatment and give you aftercare instructions to follow.

This article is for general information only and is not medical advice. Suitability, treatment plans and possible side effects are assessed individually by a physician at consultation. Individual results vary.

This article provides general information only and is not medical advice or a diagnosis. Results and risks of any treatment vary from person to person, so please consult a physician before making a treatment decision.