The popularity of tech gadgets can vary depending on different factors such as region and personal preferences. However, based on general trends and market analysis, here are ten tech gadgets that have been popular worldwide in 2021:

1. Apple iPhone 13: The latest iteration of the iPhone remains a highly sought-after device with its improved camera capabilities, faster processor, and overall performance enhancements.

2. Samsung Galaxy S21: Known for its vibrant display, powerful performance, and advanced camera system, the Galaxy S21 has been a popular choice among Android users.

3. Apple AirPods Pro: These wireless earbuds offer excellent sound quality, active noise cancellation, and seamless integration with Apple devices, making them a popular choice for audio enthusiasts.

4. Sony PlayStation 5: The next-generation gaming console from Sony has been in high demand since its release, offering immersive gaming experiences and advanced graphics capabilities.

5. Nintendo Switch: A hybrid gaming console that allows users to play games on a TV or as a handheld device, the Nintendo Switch continues to be a global hit, especially with its portability and a wide range of game titles.

6. Amazon Echo (4th generation): This smart speaker with a built-in voice assistant, Alexa, has gained popularity worldwide due to its ability to control smart home devices, play music, and answer questions.

7. Apple Watch Series 7: Apple’s latest smartwatch boasts a larger display, advanced health-tracking features, and the ability to measure blood oxygen levels, making it a popular wearable device.

8. Google Pixel 6: Known for its stellar camera performance, clean Android experience, and regular software updates, the Pixel 6 has garnered attention from tech enthusiasts.

9. DJI Mini 2: This compact drone with a high-quality camera has become popular for its ability to capture stunning aerial shots at an affordable price, making it accessible to hobbyists and content creators.

10. Sony WH-1000XM4: These wireless noise-canceling headphones offer exceptional sound quality, long battery life, and customizable noise-canceling settings, making them a popular choice among music lovers and frequent travelers.

Please note that popularity can vary depending on personal preferences, and newer releases or products specific to certain regions may not be included in this list.