Let’s face it, hair loss sucks! It can be overwhelming dealing with hair loss while trying to find the right products to help your hair growth. Lucky for you, there are amazing hair loss products and technology available on the market today to help treat hair loss. These technologies can be utilized in the comfort of your own home and they’re safe and effective! One of these treatment methods is known as low-level light therapy.

What is Low-Level Light Therapy (LLLT)?

Low-level light therapy (LLLT) is a scientifically proven technology that helps rejuvenate your hair follicles, giving them increased energy and blood flow. LLLT improves cellular respiration and stimulates your hair follicles, producing thicker and healthier hair.

Low-level light therapy is used for a number of health, wellness, and cosmetic treatments including treatments for hair loss, the healing of burns, the healing of scars, wrinkle reduction, and more. A number of hair loss prevention and/or restoration companies offer low-level light therapy treatments in the form of devices worn on the head to stimulate hair growth. 

How Does Low-Level Light Therapy Work? 

Despite the fact that the skin is the organ that is most exposed to natural light, it still responds very effectively to red and near-infrared wavelengths. The way that this response works is that the photons in the low-level light are absorbed by mitochondrial chromophores in the skin cells. This stimulates the Electron Transport Chain reaction of the mitochondria inside cells to produce adenosine triphosphate(ATP), release byproducts such as nitric oxide which dilates blood vessels and promote blood flow, and release reactive oxygen species(ROS) which has a role in the immune system, thereby reducing inflammation. Also, diverse signaling pathways and stem cell-based tissue repair and healing are activated. 

The end result is that hair follicles are stimulated to produce more hair. The effectiveness of LLLT treatments for hair growth has been tested in many scientific studies. Studies such as this one, published by the National Institute of Health, prove that this technology works to generate hair growth and is safe to use. 

Due to its effectiveness, and ease of use, LLLT is growing steadily in popularity in the hair loss prevention community. Many people are turning to it either to complement other hair restoration products, or to replace them entirely.

Evaluating the LLLT Product Options on the Market

There are several products on the market right now claiming to be the best at producing thicker, stronger, and healthier hair. But the truth is, some of these caps can’t keep up with others. Two popular LLLT companies are Kiierr and Revian. Below we’ll compare Kiierr vs. Revian Red Hair Growth System to give you some more information about these two popular LLLT products for hair growth. This article will reveal in-depth the pros and cons of each brand.


What is the Revian Red Hair Growth System?

All about Revian Red

Revian Red only has one laser hair growth cap. The Revian Red cap contains strictly LEDs and is priced at $1,495. These LED lights aim to enhance the restoration and revival of your hair follicles on your scalp. However, they are not the preferred light emittance method used in laser caps. Studies have shown that medical-grade laser diodes are more effective when looking to achieve new hair growth.

Revian Red’s laser cap is for both men and women suffering from androgenetic alopecia, and is a one-size-fits-all. The Revian cap is FDA-cleared and clinically proven to help you fight your hair loss problems. This answers the question, “Does Revian Red work?” 

Revian Red enhances hair growth by targeting biochemical processes in your scalp with two colors of light. 620 and 660 nm wavelengths of light work together to unlock the body’s natural ability to accelerate healing and renew the cells that grow hair. The Revian hair cap can increase both the thickness and density of your hair follicles, resulting in thicker, fuller, and healthier hair.

The Revian Red hair cap is lightweight, flexible, and wireless. This allows you to complete your hair growth treatment conveniently, at a time and location that works best for you. The Revian Red laser cap should be worn every day for a 10-minute time period. You should be able to start seeing new hair growth results after several months of religious, continuous, daily use of the Revian Red system according to their website. They offer a 100% money-back guarantee if you don’t see results after using the product for at least 6-months.

  • Revian Red Hair Growth System: App Feature


Revian Red features a REQUIRED app for their customers. There’s a Bluetooth connectivity that is designed to track your results throughout your treatment period.

One of the main downsides to this feature, is not everyone is technologically savvy. If you don’t know how to download and work the app, this product may not be for you. In addition, if you don’t have a tablet, cell phone, iPad, etc., you’ll be unable to use this app.

Pros and Cons of Revian Red Hair Growth System 


  • The Revian Red system is FDA-cleared 
  • It has a one-size-fits-all cap 
  • It has LED lights which emit specific wavelengths of light that can stimulate hair growth with proper use 
  • It has an app that can make using it easier, and also make it easier to track your results over time 
  • The Revian cap comes with a 6-month guarantee 


  • There is only one Revian Red cap option 
  • The Revian hair cap does not contain medical-grade laser diodes which are more effective than LEDs for stimulating hair growth 
  • Non-tech savvy users may have trouble using the app to use product
  • The $1,495 price point is expensive, especially considering that the cap does not use medical-grade laser diodes.  

What is the Kiierr Laser Cap?

Kiierr laser cap before & after photos

The Kiierr laser cap for hair loss is a hands-free, portable hair growth device that is FDA-cleared for effectiveness and safety. These caps are designed to use low-level light therapy to stimulate the blood flow in your scalp and decrease inflammation. By increasing blood flow in your scalp, the proper nutrients and oxygen levels can be transported to the scalp to help regrow strong, thick, and healthy hair follicles.

Kiierr’s hair growth system is placed inside a Kiierr ball cap or you can use a standard ball cap of your choice. This makes the laser cap fashionable, discreet, and convenient. It should be worn every other day for a time frame of 30-minutes. All Kiierr caps are made with a built-in timer, so the laser cap will automatically shut itself off after the 30-minute period is over.

Unlike Revian Red, Kiierr offers three different laser caps to choose from. The differences between the three are the amount of laser diodes they contain, along with the size of the cap. One cap (148Pro) contains 148 laser diodes. The other two (272Premier and 272PremierMD) contain 272 laser diodes. The 148Pro and 272Premier are the same size. The Kiierr272PremierMD cap has a larger size option and offers a few other enhancements and features.

The prices of these laser caps range anywhere from $645-$1,545 depending on what cap you choose. The price also reflects whether you purchase the laser cap alone, or if you purchase the complete hair growth system.

Some of Kiierr’s customers see amazing results in as little as 3-months, but typically customers report noticeable hair growth results around the 4–6-month mark. Kiierr offers a 7-month Growth Guarantee if you don’t see results after using the product continuously for at least 7-months. Kiierr also offers safe, healthy, and effective additional hair growth supplements to help maximize and speed up your hair growth.

Pros and Cons of the Kiierr Laser Cap 

  • FDA-cleared 
  • Portable 
  • Discreet baseball cap design 
  • Three different laser cap options to choose from at different price points 
  • Built-in timer 
  • All caps contain medical-grade laser diodes for optimal hair growth 
  • 7-month Growth Guarantee
  • Option to include hair growth supplements with the laser cap as a package 


  • Kiierr doesn’t offer an app to help you track your progress while you use the product

Laser Cap Reviews

What is a laser cap for hair loss?

It’s important to look at laser cap reviews before purchasing one. Reading Revian reviews and reviews for other laser caps will give you a pretty good idea about the success other customers have seen, as well as their thoughts on the products and technology. Kiierr has hundreds of 5-star laser cap reviews, allowing you to feel comfortable and excited when purchasing their products.

Comparing Kiierr vs. Revian Red Hair Growth System

Chart of Revian vs. Kiierr

These two products are similar in the fact that they both strive to regrow hair for both men and women effortlessly and they both provide free shipping on all purchases.

Kiierr contains strictly medical-grade laser diodes, while the Revian Red hair growth system contains only LEDs in their laser caps. Many hair growth companies will use LED lights in their products to make cheaper laser caps. While LED lights promote skin health and wound healing, the light being produced from these LEDs typically isn’t preferred for hair growth and doesn’t have the same capabilities as real medical-grade laser diodes.

A big difference between Kiierr and the Revian Red hair system can be found in their guarantees and warranty. Kiierr offers a 7-month guarantee or your money back. Their warranty guarantees you a new unit, absolutely free, in case of any issues related to the laser cap. Revian Red offers a 6-month guarantee and we were unable to find any warranty information on Revian Red’s website or in other Revian reviews. 

Conclusion: Revian Red Hair Growth System vs. Kiierr Laser Caps

Revian Red v. Kiierr laser cap

Kiierr and Revian Red are overall quite different in terms of products and technology. Kiierr uses medical-grade laser diodes in their caps to help promote healthy hair growth more effectively and efficiently, compared to Revian Red, which uses LED lights. You can feel confident in your Kiierr purchase, knowing that you have a 7-month growth guarantee or money back. Kiierr also offers a free 2-year warranty to protect your product during that time period.

Based on this Kiierr vs. Revian Red review and real information that we’ve researched and uncovered; we can confidently presume that the Kiierr laser cap and Kiierr hair growth supplements are the best options. Kiierr’s safe, convenient, and portable laser caps can help you combat your hair loss in as little as 4-months. Start your hair growth journey with Kiierr today!

Kiierr vs. Revian FAQs

Does Revian really work?

Revian Red is an FDA-cleared medical device used by men and women to combat hair loss on the scalp.

Does LED light stimulate hair growth?

Medical grade laser diodes are preferred by medical professionals and scientists over LEDs due to clinically proven trials and results.

Does red light therapy really work for hair growth?

Yes, red light therapy or low level light therapy is a clinically proven technology to be safe and effective to regrow the hair follicles on the scalps of men and women.

What works better for hair loss, Revian Red or Kiierr laser caps?


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Are you looking for other laser cap company comparisons? Up next: Kiierr vs. Illumiflow.