| Olena Dorohan | 🍎 | 1 | 4.7★ | Photo & Video |
| Oliver Apps | 🍎 | 1 | 4.5★ | Health & Fitness |
| Oliver Landeka | 🍎 | 1 | 4.3★ | Utilities |
| Olleyo Games | 🍎 | 1 | 4.9★ | Games |
| Olosera Limited | 🍎 | 1 | 4.2★ | UTILITIES |
| Olosho LLC | 🍎 | 1 | 4.3★ | Lifestyle |
| Olson Meditation and Mindfulness Apps Ltd | 🍎 | 1 | 4.8★ | Health & Fitness |
| Olympusat, Inc. | 🍎 | 1 | 4.7★ | Entertainment |
| Omega Labs, LLC | 🍎 | 1 | 4.8★ | Health & Fitness |
| OmniDream Limited | 🍎 | 1 | 4.9★ | Games |
| Omnia Fishing, Inc. | 🍎 | 1 | 4.7★ | Sports |
| Omoroki | 🍎 | 1 | 4.6★ | Entertainment |
| Omron Healthcare, Inc. | 🍎 | 1 | 4.7★ | Health & Fitness |
| On Hand Apps | 🍎 | 1 | 4.1★ | Utilities |
| On The Flight Line Productions LLC | 🍎 | 1 | 4.9★ | Education |
| On trac | 🍎 | 1 | 4.8★ | Business |
| OnSong LLC | 🍎 | 1 | 4.5★ | Music |
| OnStarboard LLC | 🍎 | 1 | 4.7★ | Navigation |
| Onca Studios OU | 🍎 | 1 | 4.5★ | Utilities |
| One Green Planet LLC | 🍎 | 1 | 4.4★ | Food & Drink |
| One Hundred Feet, Inc. | 🍎 | 1 | 4.0★ | Navigation |
| One Pixel Studio | 🍎 | 1 | 4.6★ | Entertainment |
| One Thumb Learning LLC | 🍎 | 1 | 4.9★ | Education |
| OneClickCommerce LLC | 🍎 | 1 | 4.6★ | Photo & Video |
| OneLabel Inc. | 🍎 | 1 | 4.7★ | Health & Fitness |
| OneUnity Digital Development Limited | 🍎 | 1 | 4.2★ | Photo & Video |
| OneWorld LLC | 🍎 | 1 | 4.7★ | Games |
| Onecent Technology Co., Limited | 🍎 | 1 | 4.7★ | Games |
| Onefootball GmbH | 🍎 | 1 | 4.8★ | Sports |
| Onekitty International Limited | 🍎 | 1 | 4.5★ | Photo & Video |
| Oni Gaming | 🍎 | 1 | 4.8★ | Games |
| Oniri Inc | 🍎 | 1 | 4.6★ | Health & Fitness |
| Onkyo Corporation | 🍎 | 1 | 3.5★ | Music |
| Online Classifieds AG | 🍎 | 1 | 4.3★ | Lifestyle |
| Online Commerce Group BV | 🍎 | 1 | 4.0★ | Entertainment |
| Online Pianist | 🍎 | 1 | 4.4★ | Music |
| Opal OS | 🍎 | 1 | 4.8★ | Productivity |
| Opala Studios Solucoes Tecnologicas Ltda | 🍎 | 1 | 4.7★ | Music |
| Open Dating Media LTD. | 🍎 | 1 | 4.5★ | Social Networking |
| Open Education, LLC | 🍎 | 1 | 4.7★ | Education |
| Open Inc. | 🍎 | 1 | 4.9★ | Health & Fitness |
| OpenAI OpCo, LLC | 🍎 | 1 | 4.8★ | GAMES |
| OpenEM Foundation | 🍎 | 1 | 4.8★ | Medical |
| OpenPhone Technologies Inc | 🍎 | 1 | 4.5★ | Business |
| OpenSooq | 🍎 | 1 | 4.6★ | Shopping |
| Opicury Software | 🍎 | 1 | 4.9★ | Reference |
| Opitas Inc. | 🍎 | 1 | 4.7★ | Utilities |
| Opper Sports, Inc. | 🍎 | 1 | 4.9★ | Health & Fitness |
| OptionStrat LLC | 🍎 | 1 | 4.8★ | Finance |
| Opus Labs CVBA | 🍎 | 1 | 4.7★ | FINANCE |