| ORBITECH PTE. LTD. | 🍎 | 1 | 4.6★ | Social Networking |
| ORCA STUDIOS PTY. LTD. | 🍎 | 1 | 4.6★ | Games |
| ORCAT PTE. LTD. | 🍎 | 1 | 4.5★ | Games |
| ORFETECH OU | 🍎 | 1 | 4.8★ | Lifestyle |
| ORGANIZEAT LTD | 🍎 | 1 | 4.8★ | FOOD_AND_DRINK |
| ORION FUTURE TECHNOLOGY LIMITED | 🍎 | 1 | 4.8★ | Games |
| ORKESTRA YAZILIM BILISIM TEKNOLOJILERI PRODUKSIYON DANISMANLIK INT HIZM LTD STI | 🍎 | 1 | 4.3★ | Games |
| OSENGO | 🍎 | 1 | 4.8★ | Health & Fitness |
| OTHINK Technology Co., Ltd. | 🍎 | 1 | 4.1★ | Photo & Video |
| OUTILS OBD FACILE SARL | 🍎 | 1 | 4.6★ | Utilities |
| OVERLAP PLUS, Inc. | 🍎 | 1 | 4.6★ | Book |
| OWL GAMES LTD | 🍎 | 1 | 4.6★ | Games |
| OZCAN ERTUN | 🍎 | 1 | 4.5★ | Photo & Video |
| OakTree Software, Inc. | 🍎 | 1 | 4.8★ | Reference |
| Oanh Hoang | 🍎 | 1 | 4.4★ | Travel |
| Oasis Games LTD | 🍎 | 1 | 4.9★ | GAMES_WORD |
| Obedience B.V. | 🍎 | 1 | 4.6★ | Lifestyle |
| Obimy inc. | 🍎 | 1 | 4.5★ | Lifestyle |
| Occipital, Inc. | 🍎 | 1 | 4.8★ | Utilities |
| Octodev Ltd | 🍎 | 1 | 4.6★ | Music |
| Oddrobo Software AB | 🍎 | 1 | 4.7★ | Education |
| Oddrok Oy | 🍎 | 1 | 4.6★ | Games |
| OddsJam | 🍎 | 1 | 4.7★ | Sports |
| Odin Brousseau | 🍎 | 1 | 4.6★ | Lifestyle |
| Offbeat Apps LLC | 🍎 | 1 | 4.7★ | Health & Fitness |
| OfferUp Inc. | 🍎 | 1 | 4.8★ | Shopping |
| Office Create Corp. | 🍎 | 1 | 4.1★ | Games |
| Offline Music Limited | 🍎 | 1 | 4.4★ | Utilities |
| Offsuit Games, Inc. | 🍎 | 1 | 4.6★ | Games |
| Ofir Yagil | 🍎 | 1 | 4.4★ | Photo & Video |
| Oguz Guner | 🍎 | 1 | 4.3★ | Utilities |
| Oguz Tecimer | 🍎 | 1 | 4.3★ | Games |
| Ohio Newspapers, Inc | 🍎 | 1 | 4.4★ | News |
| Oishi kenko Inc. | 🍎 | 1 | 4.2★ | Health & Fitness |
| OkCupid | 🍎 | 1 | 4.3★ | Lifestyle |
| OkMeet Limited | 🍎 | 1 | 4.6★ | Lifestyle |
| Okapi Yazilim | 🍎 | 1 | 4.6★ | Photo & Video |
| OkiPlay Ltd | 🍎 | 1 | 4.6★ | Education |
| Okko OOO | 🍎 | 1 | 4.7★ | Entertainment |
| Oksana Safronenko | 🍎 | 1 | 4.6★ | Health & Fitness |
| Old Skull Games | 🍎 | 1 | 4.7★ | Games |
| Oleg Alekseenko | 🍎 | 1 | 4.9★ | Utilities |
| Oleh Rodionov | 🍎 | 1 | 4.7★ | Lifestyle |
| Oleksandr Godoba | 🍎 | 1 | 4.0★ | Games |
| Oleksandr Pylaiev | 🍎 | 1 | 4.6★ | Music |
| Oleksandr Serhiienko | 🍎 | 1 | 5.0★ | Health & Fitness |
| Oleksii Diachenko | 🍎 | 1 | 4.4★ | Games |
| Oleksii Hohol | 🍎 | 1 | 4.7★ | Games |
| Oleksiy Koldunov | 🍎 | 1 | 4.7★ | Reference |
| Olena Bachurina | 🍎 | 1 | 4.9★ | Education |