![Guide.in.ua Guide.in.ua](https://guide.in.ua/assets/images/guide300.webp)
- United States
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
- Ukraine
- United Kingdom
- Italy
- Poland
- Australia
- Spain
- New Zealand
- France
- Germany
TOP 30 Unique pedicure in California
715 results found
Search for local businesses, places and services near you
All About Hair Design's & Boutique
All About Hair Design's & Boutique is a premier beauty salon located in the heart of Santa Maria, California. Our talented team of stylists and beauty experts are dedicated to helping you achieve the perfect look for any occasion. From trendy haircuts and vibrant hair color to luxurious spa treatments and professional makeup application, we offer a wide range of services to enhance your natural beauty. Visit us at 801 South Broadway and let us pamper you from head to toe at All About Hair Design's & Boutique.
Jolene's Elegant Hair Fashion
Jolene's Elegant Hair Fashion is a premier beauty salon located at 122 North A Street in Lompoc, California. Our skilled team of stylists are dedicated to providing you with the latest trends in hair fashion, from cutting-edge cuts to stunning color treatments. Whether you're looking for a fresh new look or just need a touch-up, our salon offers a personalized experience that will leave you feeling fabulous. Come visit us at Jolene's Elegant Hair Fashion and let us help you achieve the perfect hairstyle that suits your unique style and personality.
Majestic Nail
Majestic Nail is a premier beauty salon located in Lompoc, California, United States. Our salon is dedicated to providing top-notch nail care services in a relaxing and luxurious environment. With a team of skilled nail technicians, we offer a wide range of services including manicures, pedicures, nail extensions, and nail art. Come visit us at 730 North H Street and treat yourself to a pampering experience at Majestic Nail.
K H Nails
K H Nails is a premier beauty salon located in the heart of Lompoc, California, United States. Our skilled technicians offer a wide range of nail services, including manicures, pedicures, and nail art. With a focus on quality and customer satisfaction, we strive to provide a relaxing and luxurious experience for all of our clients. Visit us at 419 East Ocean Avenue to pamper yourself and enhance your natural beauty at K H Nails.
Heart & Soles Self Care Spa
Heart & Soles Self Care Spa is a tranquil oasis located at 3669 Sagunto Street in Santa Ynez, California. Our spa offers a unique and holistic approach to self-care, focusing on the well-being of both the heart and the soles of our clients. From luxurious massages and soothing facials to rejuvenating foot treatments, our experienced therapists provide personalized services to help you relax, unwind, and rejuvenate. Step into our serene environment and let us pamper you from head to toe. Experience the ultimate in relaxation and self-care at Heart & Soles Self Care Spa.
Estetica Mia-A Jurlique Lifestyle Spa
Estetica Mia-A Jurlique Lifestyle Spa is a beauty salon and spa located at 3311 State Street in Santa Barbara, California. We offer a unique experience of deep beauty, curated just for you. Our spacious and meditative environment, along with our planet-conscious products and knowledgeable team, create a nurturing and transformative experience. During your first visit, you will experience simple and sustainable beauty rituals that leave you feeling rejuvenated. Our goal is to cultivate your natural beauty and provide you with authentic self-care rituals that you can continue at home.
Phenix Salon Suites Santa Barbara
Phenix Salon Suites Santa Barbara is a premier beauty salon located at 130 South Hope Avenue in Santa Barbara, California. Our salon offers a unique and luxurious experience for both clients and beauty professionals. With a focus on personalized service and top-quality products, our talented team of stylists, estheticians, and nail technicians provide a wide range of services to help you look and feel your best. Whether you're looking for a fresh new haircut, a relaxing facial, or a stunning manicure, Phenix Salon Suites Santa Barbara has you covered. Visit us today and experience the ultimate in beauty and relaxation.
Nu Image Nails & Day Spa
Nu Image Nails & Day Spa is a luxurious beauty salon located on State Street in Santa Barbara, California. Our skilled professionals offer a wide range of services including manicures, pedicures, facials, massages, and more. Relax and rejuvenate in our tranquil spa atmosphere while our team pampers you with top-notch treatments and exceptional customer service. Whether you're looking for a quick touch-up or a full day of spa indulgence, Nu Image Nails & Day Spa is the perfect destination for all your beauty needs. Visit us today and experience the ultimate in pampering and relaxation.
Rainbow Nails
Rainbow Nails is a vibrant and trendy beauty salon located in the heart of Santa Barbara, California. Our expert nail technicians specialize in creating stunning and unique nail designs that will make you stand out from the crowd. Whether you're looking for a classic manicure or a bold and colorful nail art, we've got you covered. Our salon is known for its friendly and welcoming atmosphere, where you can relax and pamper yourself while getting your nails done. Come visit us at 10b West Calle Laureles and let us help you achieve the perfect look for any occasion.
About Faces Skin Care
About Faces Skin Care is a premier beauty salon and spa located in the heart of Santa Barbara, California. Our expert estheticians are dedicated to providing top-notch skin care services tailored to each individual's unique needs. From facials and peels to waxing and massages, we offer a wide range of treatments to help you look and feel your best. Visit us at 130 South Hope Avenue for a relaxing and rejuvenating experience that will leave your skin glowing and refreshed.
Anna's Nails
Anna's Nails is a premier beauty salon located on State Street in the heart of Santa Barbara, California. Our talented team of nail technicians are dedicated to providing top-notch nail services in a clean and relaxing environment. From manicures to pedicures, acrylics to gels, we offer a wide range of services to help you achieve the perfect look for any occasion. Come visit us at Anna's Nails and treat yourself to a pampering experience that will leave you feeling refreshed and rejuvenated.
Carpinteria Nails
Carpinteria Nails is a premier beauty salon located in the picturesque town of Carpinteria, California. Our expert nail technicians provide top-notch services in a clean and relaxing environment. From manicures and pedicures to nail art and gel extensions, we offer a wide range of options to suit your individual style and preferences. Visit us at 5035 Wullbrandt Way to pamper yourself and leave feeling fabulous from head to toe.
Perfect Cut-El Corte Perfecto
Perfect Cut- El Corte Perfecto is a premier beauty salon located at 4962 Carpinteria Avenue in Carpinteria, California. Our skilled stylists specialize in providing the perfect haircut to suit your unique style and personality. From trendy cuts to classic styles, we offer a range of hair care services to help you look and feel your best. In addition to hair services, we also offer health treatments to promote overall well-being. Visit us today for a truly perfect experience at Perfect Cut- El Corte Perfecto.
Le's Nails Spa
Le's Nails Spa, located at 4693 Telephone Road in Ventura, California, is the go-to nail salon in the area. With years of experience, our talented staff offers a wide range of nail and spa services, including manicures, pedicures, facials, nail art, gel manicures, and lash extensions. Our customers rave about our professional and reliable services, with many mentioning specific staff members who provided exceptional service. Our salon is known for being clean, affordable, and accommodating, ensuring a relaxing and enjoyable experience for all. Whether you're looking for a simple manicure or a more elaborate nail design, Le's Nails Spa has you covered. Visit us today for a unique and pampering experience.
Sola Salon Studios
Sola Salon Studios in Ventura, California offers a unique opportunity for independent beauty professionals. Conveniently located in the Montalvo Square shopping center, our salon features 28 individual studios perfect for hair stylists, estheticians, and other cosmetology professionals. Each studio is move-in ready with shampoo bowls and shelving fixtures, allowing you to open your salon in no time. We understand that going independent can be overwhelming, which is why we provide support every step of the way. From choosing the brands and products you share with your clients to offering a secure locking door for your personal space, we are here to help you achieve your dream of owning your own salon.
Golden Scissors
Golden Scissors is a premier beauty salon located at 143 North Ventura Road in Port Hueneme, California. Our expert stylists are dedicated to providing top-notch haircuts, styling, coloring, and treatments to help you achieve your desired look. With a warm and inviting atmosphere, you'll feel pampered and relaxed as you receive personalized services tailored to your unique preferences. Whether you're looking for a simple trim or a complete makeover, Golden Scissors is the perfect place to indulge in a day of self-care and beauty. Visit us today and let us help you look and feel your best.
Luxer Nails And Spa
Luxer Nails And Spa is a beauty salon located at 3720 Saviers Road in Oxnard, California. Our dedicated team of experts are here to make you happy and provide you with the best nail care services. We take pride in our work and pay attention to every detail to ensure your nails look fabulous. Whether you're looking for a classic manicure or something more unique, we have a wide range of colors, shapes, and sizes to choose from. Our team stays up to date with the latest trends and techniques in the industry, so you can trust that you're in good hands.
Catalina Hair & Nail Salon
Catalina Hair & Nail Salon is a beauty salon located at 205 Crescent Street in Avalon, California, United States. Your trip to Catalina Island will not be complete without a visit to the charming Metropole Market Place where the salon is situated. Enjoy a stroll through the lively French Quarter atmosphere of cobblestone walkways and cooling fountains. In the collection of boutiques at Metropole Market Place, you'll find unique gifts, fine art, sportswear, children's wear, exquisite jewelry, a classic arcade, fresh baked goods, and an espresso bar. The salon specializes in perms, haircuts, styles for weddings and special occasions, waxing, and facials. Make sure to include a visit to Catalina Hair & Nail Salon to complete your island experience.
Catalina Sea Spa
Located at 117 Clarissa Avenue in Avalon, California, Catalina Sea Spa is a top-rated beauty salon and spa that offers a luxurious and rejuvenating experience. Voted as the #1 Spa on TripAdvisor and Yelp, our award-winning spa focuses on providing innovative and personalized treatments to help you relax and re-energize your body, mind, and soul. Our highly qualified therapists are known for their attention to detail and attentive care, ensuring that each customer receives a premium and unique spa experience. From impeccable customer service to tailored massage services, we strive to meet your individual needs and preferences.
Via Venice
Via Venice is a cozy beauty salon located in the heart of Venice Beach, Los Angeles, California. Our highly skilled professionals have years of experience and offer a wide range of services to enhance your unique beauty. Whether you're looking for a relaxing facial, a trendy haircut, or a glamorous makeover, Via Venice is the place to be. Come visit us at 1501 Main Street and experience the ultimate pampering experience.
Outrageous Nail Designs
Outrageous Nail Designs is a trendy beauty salon located at 522 North A Street in Oxnard, California. Specializing in creative and eye-catching nail designs, our talented nail technicians are dedicated to providing top-notch services to our clients. Whether you're looking for a classic manicure or a bold, statement-making nail art, we have you covered. Step into our salon and treat yourself to a pampering experience that will leave you feeling fabulous and confident. Book an appointment with us today and let us help you express your unique style through your nails.
Sola Salon Studios
Sola Salon Studios in Culver City, California offers a unique opportunity for beauty professionals to own their own salon space. Conveniently located near major shopping centers and with easy access to the I-405, our beautifully constructed studios provide a private and upscale environment for hair stylists, estheticians, and other cosmetology professionals. With 47 individual salon studios, you can create your own schedule, choose your own products, and enjoy the benefits of salon ownership. Join our community of independent salon owners and experience the freedom and control that comes with owning your own space. We provide support and tools to help you succeed in your journey to living the life you love. Ample free parking is available for both studio owners and their clients.
UNIQ Nails & Hair
UNIQ Nails & Hair is a premier beauty salon located in the heart of Redondo Beach, California. Our skilled team of professionals specializes in nail care and hair services, providing top-quality treatments to help you look and feel your best. Whether you're in need of a fresh manicure, a stylish haircut, or a luxurious spa treatment, our friendly staff is here to cater to your every need. Visit us at 1708 Aviation Boulevard for a relaxing and rejuvenating experience that will leave you feeling UNIQuely beautiful.
Queen Nails
Queen Nails is a premier beauty salon located at 222 West Grand Avenue in El Segundo, California. Our skilled technicians provide top-notch nail services, including manicures, pedicures, and nail enhancements. We pride ourselves on using high-quality products and offering a clean and relaxing environment for our clients. Whether you're looking for a classic manicure or a trendy nail design, Queen Nails is the go-to destination for all your nail care needs. Visit us today and treat yourself to a pampering experience fit for a queen!
Four seasons Nails-Bar
Four Seasons Nails Bar is a beauty salon located at 130 East Grand Avenue in El Segundo, California. Our salon offers a wide range of nail services including manicures, pedicures, gel, dipping powder, and waxing, all performed by experienced technicians at a reasonable price. Our salon provides a lovely, comfortable, clean, and friendly space for you to relax and unwind after a long day. We use top-of-the-line sanitation products and stay updated on the latest trends and innovations in the industry. Our talented technicians will pamper you with beautiful and stylish nail designs in a world-class environment. Visit our Gallery to see more designs and experience a unique and relaxing nail care experience at Four Seasons Nails Bar.
12Twelve Nail Bar
12Twelve Nail Bar is a luxury boutique nail salon located at 4635 Admiralty Way in Marina del Rey, California. With stunning waterfront views, our salon offers a unique and exclusive experience for our clients. With 15 years of experience in the nail industry, we pride ourselves on providing customized, high-quality nail services that exceed expectations. Our team of experienced nail technicians are dedicated to giving each client personalized attention and ensuring complete satisfaction. At 12Twelve Nail Bar, we believe in the power of the number 1212 as a symbol of happiness, joy, and balance in life. Our salon is designed to provide a couture chic luxury environment for you to relax and indulge in a top-notch nail experience.
18K Nail Boutique
Welcome to 18K Nail Boutique, a luxurious nail salon located in Santa Monica, California. Our expert team of beauty professionals is dedicated to providing you with the highest quality service and making you look and feel beautiful. We offer exclusive, high-performance products and personalized recommendations to meet your specific needs. Stay connected with us for exclusive deals and the latest beauty trends. Our salon offers a range of services including manicures, pedicures, CBD treatments, dipping powder, and waxing in a clean and relaxing environment. Our instruments are sterilized after each use to ensure your safety. Come pamper yourself and experience the royal treatment at 18K Nail Boutique.
Ting’s Nail Art Studio
Ting's Nail Art Studio is a premier beauty salon located in Los Angeles, California. Our studio specializes in providing top-notch nail art services, including manicures, pedicures, and nail enhancements. Our talented team of nail technicians are dedicated to creating beautiful and unique designs that are tailored to each client's individual style and preferences. At Ting's Nail Art Studio, we strive to provide a relaxing and luxurious experience for our customers, ensuring they leave feeling pampered and looking fabulous. Visit us at 11712 Darlington Avenue to treat yourself to a day of beauty and relaxation.
Yadira's Unisex Beauty Salon
Yadira's Unisex Beauty Salon is a top-rated beauty salon located in the heart of Los Angeles, California. Offering a wide range of services for both men and women, our skilled team of beauty professionals are dedicated to helping you look and feel your best. From haircuts and styling to manicures, pedicures, and waxing, we provide personalized services to meet your unique beauty needs. Visit us today and experience the ultimate pampering and relaxation in a warm and welcoming atmosphere.
Polished NailBar
Polished NailBar is a premier beauty salon located in Bakersfield, California. We specialize in nail care services, offering a wide range of manicures and pedicures to pamper and beautify your hands and feet. In addition to nail services, we also provide hair care treatments to help you achieve the perfect look. Our professional and experienced staff are dedicated to providing top-notch services in a relaxing and welcoming environment. Visit us at 2701 Calloway Drive to experience the ultimate in beauty and self-care.
- Unique pedicure in Alamo
- Unique pedicure in Albany
- Unique pedicure in Alhambra
- Unique pedicure in Anaheim
- Unique pedicure in Antioch
- Unique pedicure in Arroyo Grande
- Unique pedicure in Artesia
- Unique pedicure in Auburn
- Unique pedicure in Avalon
- Unique pedicure in Bakersfield
- Unique pedicure in Baldwin Park
- Unique pedicure in Banning
- Unique pedicure in Baywood-Los Osos
- Unique pedicure in Bell
- Unique pedicure in Bell Gardens
- Unique pedicure in Bellflower
- Unique pedicure in Benicia
- Unique pedicure in Berkeley
- Unique pedicure in Beverly Hills
- Unique pedicure in Blythe
- Unique pedicure in Brea
- Unique pedicure in Brentwood
- Unique pedicure in Buena Park
- Unique pedicure in Camarillo
- Unique pedicure in Cambria
- Unique pedicure in Campbell
- Unique pedicure in Capitola
- Unique pedicure in Carlsbad
- Unique pedicure in Carmel-by-the-Sea
- Unique pedicure in Carmichael
- Unique pedicure in Carpinteria
- Unique pedicure in Carson
- Unique pedicure in Castro Valley
- Unique pedicure in Cerritos
- Unique pedicure in Chino
- Unique pedicure in Chino Hills
- Unique pedicure in Chula Vista
- Unique pedicure in Citrus Heights
- Unique pedicure in City of Industry
- Unique pedicure in Commerce
- Unique pedicure in Compton
- Unique pedicure in Concord
- Unique pedicure in Corning
- Unique pedicure in Corona
- Unique pedicure in Coronado
- Unique pedicure in Corte Madera
- Unique pedicure in Costa Mesa
- Unique pedicure in Covina
- Unique pedicure in Culver City
- Unique pedicure in Cupertino
- Unique pedicure in Cypress
- Unique pedicure in Dana Point
- Unique pedicure in Danville
- Unique pedicure in Davis
- Unique pedicure in Del Mar
- Unique pedicure in Downey
- Unique pedicure in Dublin
- Unique pedicure in East Los Angeles
- Unique pedicure in Eastvale
- Unique pedicure in El Cajon
- Unique pedicure in El Monte
- Unique pedicure in El Segundo
- Unique pedicure in Elk Grove
- Unique pedicure in Escondido
- Unique pedicure in Eureka
- Unique pedicure in Fair Oaks
- Unique pedicure in Fairfield
- Unique pedicure in Folsom
- Unique pedicure in Fontana
- Unique pedicure in Fort Bragg
- Unique pedicure in Fortuna
- Unique pedicure in Fountain Valley
- Unique pedicure in Fremont
- Unique pedicure in Fullerton
- Unique pedicure in Garden Grove
- Unique pedicure in Gardena
- Unique pedicure in Gilroy
- Unique pedicure in Granite Bay
- Unique pedicure in Grover Beach
- Unique pedicure in Hacienda Heights
- Unique pedicure in Half Moon Bay
- Unique pedicure in Hawthorne
- Unique pedicure in Hayward
- Unique pedicure in Hemet
- Unique pedicure in Hermosa Beach
- Unique pedicure in Huntington Beach
- Unique pedicure in Huntington Park
- Unique pedicure in Inglewood
- Unique pedicure in Irvine
- Unique pedicure in La Habra
- Unique pedicure in La Mesa
- Unique pedicure in La Mirada
- Unique pedicure in La Palma
- Unique pedicure in La Puente
- Unique pedicure in Lafayette
- Unique pedicure in Laguna Beach
- Unique pedicure in Laguna Niguel
- Unique pedicure in Lake Elsinore
- Unique pedicure in Lake Forest
- Unique pedicure in Lakeport
- Unique pedicure in Lakewood
- Unique pedicure in Larkspur
- Unique pedicure in Lemon Grove
- Unique pedicure in Lincoln
- Unique pedicure in Livermore
- Unique pedicure in Lodi
- Unique pedicure in Loma Linda
- Unique pedicure in Lomita
- Unique pedicure in Lompoc
- Unique pedicure in Long Beach
- Unique pedicure in Los Alamitos
- Unique pedicure in Los Angeles
- Unique pedicure in Lynwood
- Unique pedicure in Malibu
- Unique pedicure in Mammoth Lakes
- Unique pedicure in Manhattan Beach
- Unique pedicure in Marina del Rey
- Unique pedicure in Martinez
- Unique pedicure in Maywood
- Unique pedicure in McKinleyville
- Unique pedicure in Mendocino
- Unique pedicure in Menifee
- Unique pedicure in Menlo Park
- Unique pedicure in Mill Valley
- Unique pedicure in Montclair
- Unique pedicure in Montebello
- Unique pedicure in Monterey
- Unique pedicure in Monterey Park
- Unique pedicure in Moorpark
- Unique pedicure in Moreno Valley
- Unique pedicure in Morgan Hill
- Unique pedicure in Morro Bay
- Unique pedicure in Mountain View
- Unique pedicure in Napa
- Unique pedicure in National City
- Unique pedicure in Newark
- Unique pedicure in Newport Beach
- Unique pedicure in Norco
- Unique pedicure in North Highlands
- Unique pedicure in Norwalk
- Unique pedicure in Novato
- Unique pedicure in Oakland
- Unique pedicure in Oakley
- Unique pedicure in Oceanside
- Unique pedicure in Orange
- Unique pedicure in Oxnard
- Unique pedicure in Pacifica
- Unique pedicure in Paramount
- Unique pedicure in Paso Robles
- Unique pedicure in Perris
- Unique pedicure in Petaluma
- Unique pedicure in Pico Rivera
- Unique pedicure in Pinole
- Unique pedicure in Pittsburg
- Unique pedicure in Placentia
- Unique pedicure in Pleasanton
- Unique pedicure in Pomona
- Unique pedicure in Port Hueneme
- Unique pedicure in Poway
- Unique pedicure in Ramona
- Unique pedicure in Rancho Cordova
- Unique pedicure in Rancho Cucamonga
- Unique pedicure in Rancho Santa Margarita
- Unique pedicure in Red Bluff
- Unique pedicure in Redlands
- Unique pedicure in Redondo Beach
- Unique pedicure in Richmond
- Unique pedicure in Riverside
- Unique pedicure in Rocklin
- Unique pedicure in Rohnert Park
- Unique pedicure in Rolling Hills Estates
- Unique pedicure in Roseville
- Unique pedicure in Sacramento
- Unique pedicure in Salinas
- Unique pedicure in San Anselmo
- Unique pedicure in San Bernardino
- Unique pedicure in San Carlos
- Unique pedicure in San Clemente
- Unique pedicure in San Diego
- Unique pedicure in San Francisco
- Unique pedicure in San Gabriel
- Unique pedicure in San Jose
- Unique pedicure in San Juan Capistrano
- Unique pedicure in San Leandro
- Unique pedicure in San Lorenzo
- Unique pedicure in San Luis Obispo
- Unique pedicure in San Marcos
- Unique pedicure in San Pablo
- Unique pedicure in San Rafael
- Unique pedicure in San Ramon
- Unique pedicure in Santa Ana
- Unique pedicure in Santa Barbara
- Unique pedicure in Santa Clara
- Unique pedicure in Santa Clarita
- Unique pedicure in Santa Cruz
- Unique pedicure in Santa Maria
- Unique pedicure in Santa Monica
- Unique pedicure in Santa Rosa
- Unique pedicure in Santa Ynez
- Unique pedicure in Scotts Valley
- Unique pedicure in Seaside
- Unique pedicure in Sebastopol
- Unique pedicure in Signal Hill
- Unique pedicure in Solvang
- Unique pedicure in Sonoma
- Unique pedicure in South El Monte
- Unique pedicure in South Gate
- Unique pedicure in South Lake Tahoe
- Unique pedicure in South San Francisco
- Unique pedicure in Spring Valley
- Unique pedicure in St. Helena
- Unique pedicure in Stanton
- Unique pedicure in Stockton
- Unique pedicure in Tahoe City
- Unique pedicure in Temecula
- Unique pedicure in Templeton
- Unique pedicure in Thousand Oaks
- Unique pedicure in Torrance
- Unique pedicure in Tracy
- Unique pedicure in Truckee
- Unique pedicure in Turlock
- Unique pedicure in Tustin
- Unique pedicure in Ukiah
- Unique pedicure in Vacaville
- Unique pedicure in Vallejo
- Unique pedicure in Ventura
- Unique pedicure in Vista
- Unique pedicure in Walnut Creek
- Unique pedicure in Watsonville
- Unique pedicure in West Sacramento
- Unique pedicure in Westlake Village
- Unique pedicure in Westminster
- Unique pedicure in Whittier
- Unique pedicure in Windsor
- Unique pedicure in Woodland
- Unique pedicure in Yorba Linda
- Unique pedicure in Yucaipa
List of local businesses, places and services in California
⭐ business help 🔍 services ☎ phones 🕒 opening times ✍️reviews 🌍 addresses, locations 📷 photos