- SignVideo®
- Sihor Seva Sadan
- Siizzle
- Sijpekerk
- Sikh Gurdwara Sahib -San Jose
- Sikh Wisdom: Sikh Q&A Platform
- SikhOne
- SIKU
- Silicon Valley Triathlon Club
- Silk Road Camel Stickers
- SILK(シルク) 年上女性マッチングアプリ
- Silly Seal Animated Stickers
- Silo - League Community App
- Silver Social
- SILVERBACK WAY
- SilverDialer
- Silversquare
- Sim2Dial Plus
- Sima Space
- SimConnect
- Sima Space
- SimConnect
- Simi - Dating & Meet People
- Simkl Lists: TV, Anime, Movies
- Simlar - secure calls
- SIMless - 2nd Phone Number
- Simmer Recipes
- SimmerNote
- Simon: cute funny cat stickers
- Simon-Kucher Alumni Network
- ITZA Messenger - Privacy First
- Simp Tools
- Simple Car Delivery
- Simple client for mixi
- Simple Groups
- Simple Log - Journal Diary Log
- Simple Love - The Couple App
- Simple Muslim Dating
- Simple SMS Scheduler - Auto Text Message Sending Timer