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b399 Download the App — The Best Gaming Experience on Android & iOS
The b399 app puts the entire gaming world at your fingertips. Play Live Casino, slots, fish games, and Sports Betting anytime, anywhere.
The b399 app puts the entire gaming world at your fingertips. Play Live Casino, slots, fish games, and Sports Betting anytime, anywhere.
The b399 app works seamlessly on both Android and iOS
Works on all Android phones including Samsung, Xiaomi, Realme, and Oppo. Install the APK file directly.
Download APKWorks on both iPhone and iPad. Install directly from the App Store — no hassle.
View on App StoreNo problem if you prefer not to download the app. b399 works fully in a web browser too. Open Chrome, Firefox, or Safari, go to b399.fun, and enjoy all the games.
B399 Mobile App — Uninterrupted Gaming on Any Device
Get the b399 app running on your Android phone in just a few simple steps.
Click the "Download APK" button above. The file will be saved to your phone's Download folder.
Go to Settings → Security → Unknown Sources and enable it. This allows APK files from outside the Google Play Store to be installed.
Open your File Manager or your browser's Download section, find the b399 APK file, and tap it.
The Install button will appear on screen. Tap it and wait a few seconds — the app will be installed shortly.
Open the app, then log in with your b399 account or create a new one.
Get the b399 app up and running on your iPhone or iPad in just a few minutes
Open the App Store app on your iPhone or iPad.
Type "b399" in the search bar and find the correct app.
Tap Get or the download icon next to the app. Enter your Apple ID password if prompted.
Once installation is complete, tap Open to launch the app right away.
Log in with your username and password and start playing.
Installing the b399 app — quick and easy
Why thousands of Bangladeshi players prefer the b399 app
The b399 app is lightweight and optimized, so it loads fast even on slow internet. No high-speed connection needed to play.
Your account and transactions are always protected with SSL encryption and two-factor authentication (2FA).
Get notified about new bonuses, promotions, or upcoming matches before they kick off — never miss an offer.
Mobile Banking, Nagad, Rocket, or USDT — all payment methods are available directly within the app. Deposits and withdrawals process within minutes.
The app interface is fully in Bengali and user-friendly. Even new users can find every section with ease.
When a new version is available, the app automatically alerts you to update. Always stay on the latest features and security patches.
Watch live sports and bet at the same time. The b399 app runs in-play betting alongside a live stream simultaneously.
B399 app includes a dark mode for comfortable night-time viewing. Play for longer sessions without straining your eyes.
Contact customer support directly from within the app. Bengali live chat is available around the clock.
Online gaming is growing fast in Bangladesh, and b399 is right at the center of that shift. Beyond the website, b399 is now available as a full-featured mobile app that delivers outstanding performance on both Android and iOS. Many people assume mobile apps fall short of the desktop experience — with b399, it's the complete opposite.
The b399 app is built with Bangladeshi users in mind. Since most people in the country access the internet on mobile, the app runs smoothly on both 3G and 4G connections. Special optimizations keep load times low, so you can play games or place bets effortlessly even on budget data plans.
When you open the b399 app, you are greeted by a clean home screen where all sections are visible at a glance. In Sports Betting, odds for cricket, football, kabaddi, and other popular sports update in real time. Building a bet slip and placing bets on multiple matches simultaneously is even easier on the app.
Stepping into the Live Casino section feels like sitting at a real casino floor. Video streaming stays crisp and clear while you play baccarat, roulette, or blackjack with live dealers. b399's video optimization is so efficient that it runs buffer-free even on a weak connection.
Slots players will find over 500 games on the b399 app. Spinning the reels on a touchscreen is a completely different feel — it's like running a slot machine right at your fingertips. Popular titles include Gates of Olympus, Sweet Bonanza, and many more fan favorites among Bangladesh players.
Fish shooter games are even more enjoyable on mobile since aiming with a touchscreen feels natural and precise. The fish games section on b399 offers a variety of rooms — from low-stakes tables all the way up to high-stakes VIP rooms. Graphics appear sharper in the app because it renders directly through the device's GPU.
Making payments on the b399 app is effortless. Save your Mobile Banking number once and all you need after that is your PIN. Nagad and Rocket work the same way. Withdrawal requests are typically processed within 15 minutes — a speed very few platforms in the market can match.
B399 takes security seriously and never compromises. The app supports biometric login (fingerprint or Face ID), and every session runs on an SSL-encrypted connection. If anyone attempts to log in from an unrecognized device, you'll get an instant notification on your phone.
B399 VIP members enjoy exclusive in-app benefits not available on the website. Access the exclusive VIP lounge, chat with your personal account manager in-app, and enjoy priority withdrawals — all from within the app. VIP tournament notifications are delivered directly as push notifications.
B399 App — Bangladesh's best gaming experience in your hands
Check if your device is ready to run the b399 app
| Topic | Android | iOS |
|---|---|---|
| Minimum OS Version | Android 5.0 (Lollipop) | IOS 13.0 |
| Processor | 1.4 GHz or higher | A12 Bionic or equivalent |
| RAM | Minimum 2 GB | Minimum 2 GB |
| Storage Space | 50 MB Free Space | 60 MB Free Space |
| Internet | 3G / 4G / WiFi | 3G / 4G / WiFi |
| App Size | 38 MB | 42 MB |
| Latest Update | January 2026 | January 2026 |
The most frequently asked questions about the download
Download the b399 app and enjoy your favorite games from anywhere.