⚡ Browser APIs in Bulgaria

Browser APIs (Application Programming Interfaces) are a set of functions that allow web developers to interact with the browser and system resources, providing features such as data storage, network requests, performance monitoring, graphics rendering, background tasks, and camera and microphone access.

Bulgaria is a Southeastern European country with a population of around 6.5 million people.

According to our data, browser APIs are detected on 32.3% of websites from Bulgaria.

⭐ Most Popular in 2026

The following chart shows the top browser APIs in Bulgaria in 2026, based on market share.

The most popular is Web Storage with an impressive share of 56.1%, followed by XMLHttpRequest with 42.6% and Fetch with 12.6%.

Web Storage 56.1%
XMLHttpRequest 42.6%
Fetch 12.6%
Beacon API 3.8%
Navigation Timing 3.2%
PerformanceObserver 1.7%
Interest-Based Advertising Opt-Out 1.1%
WebSocket 0.8%
WebGL 0.6%
Notifications API 0.4%
Geolocation API 0.3%
Origin Trials 0.07%
WebRTC 0.07%
Speech Recognition API 0.02%
Screen Orientation API 0.02%

🚀 Highlights

Here is a list of the top APIs that are more popular in Bulgaria than worldwide.
Differences between global and country rankings are shown in parentheses.

4. Beacon API ^(-1)
7. Interest-Based Advertising Opt-Out ^(-1)
10. Notifications API ^(-2)
12. Origin Trials ^(-3)
14. Speech Recognition API ^(-3)

✨ Best Browser APIs

Below is a more detailed list of 16 browser APIs used on sites from Bulgaria, ranked by their market share.

Rank	Name	Market share
1	Web Storage Cambridge, Massachusetts, United States A browser API and client-side key-value database that allows websites to store persistent data on users' devices.	56.1%
2	XMLHttpRequest Cambridge, Massachusetts, United States A JavaScript API to create HTTP requests.	42.6%
3	Fetch Cambridge, Massachusetts, United States A modern XMLHttpRequest alternative for fetching network resources.	12.6%
4	Beacon API Cambridge, Massachusetts, United States Used to send asynchronous and non-blocking requests to a web server.	3.8%
5	Navigation Timing Cambridge, Massachusetts, United States A part of the Performance API that provides metrics related to navigation from one page to another.	3.2%
6	PerformanceObserver Cambridge, Massachusetts, United States A part of the Performance API that is used to monitor performance measurement events.	1.7%
7	Interest-Based Advertising Opt-Out Allowed sites to exclude themselves from Federated Learning of Cohorts cohort calculations using the "interest-cohort=()" permission policy.	1.1%
8	WebSocket Fremont, California, United States API enables full-duplex communication between a web browser and a web server.	0.8%
9	WebGL A cross-platform, royalty-free open web standard for a low-level 3D graphics API based on OpenGL.	0.6%
10	Notifications API Cambridge, Massachusetts, United States Used to configure and display desktop notifications to the user.	0.4%
11	Geolocation API Cambridge, Massachusetts, United States Allows web applications to retrieve the user's location, including latitude and longitude.	0.3%
12	Origin Trials Mountain View, California, United States A way for developers to test and use experimental web platform features.	0.07%
13	WebRTC A set of protocols and APIs that enable real-time communication natively from web browsers and and mobile applications.	0.07%
14	Speech Recognition API A part of the Web Speech API that controls the speech recognition service.	0.02%
15	Screen Orientation API Cambridge, Massachusetts, United States Exposes the current type and angle of the device's screen orientation, and dispatches events when it changes.	0.02%
16	IndexedDB Cambridge, Massachusetts, United States A transactional NoSQL database system for the persistent storage of structured data inside a user's browser. Free	0.02%

👉 See Also

🌎 Browser APIs in other countries

Data is based on the analysis of 12,911 websites from Bulgaria.
Statistics were last calculated on March 21, 2026.
For details, see our methodology and disclaimer.