Reference

j400f App for Android and iOS

The j400f app puts live casino tables, slots including Crash Game and Aviator, and a full sportsbook betslip in one place on your phone — available where local…

AndroidiOSAPK 30MBPush alertsFingerprint login

Explore Lobby Read FAQ

Everything the Lobby Offers, in Your Pocket

The j400f app is built so you can move between live roulette tables, slot rooms featuring Mahjong Ways and Gates of Olympus, and your sportsbook betslip without switching tabs or losing your place. Push notifications let you know when a match you have tracked goes live. Quick deposit via UPI, Paytm or PhonePe means your wallet is topped up before the next

round starts. Fingerprint login removes the password step entirely so you are inside the lobby in under three seconds.

APP FEATURE SNAPSHOT

Six Things the App Does That the Browser Cannot

Each feature below was added because India users asked for it specifically. These are concrete differences you notice the moment you install the j400f app rather than opening…

Biometric Login Set up fingerprint or face unlock once and you skip…

Push Notifications Receive an alert the moment a live table you follow…

Dark Mode Switch between light and dark display with one tap.

Offline Lobby Preview Browse the game catalogue and read table details even when…

Quick Deposit Shortcut A single tap from the home screen opens the UPI…

Native Performance The app renders live-dealer video at a lower data rate…

Install the j400f App in Three Steps

The Android APK is not on the Google Play Store, so you allow installation from unknown sources in your device settings first. iOS users install via the Safari browser prompt — no App Store needed. The whole process from download to lobby takes under two minutes on a standard connection.

Download the APK or iOS Build — Tap the download link on j400f.co from your phone browser. Android gets an APK file; iOS gets a profile install prompt via Safari.
Allow Installation from Unknown Sources — On Android, open Settings, go to Security or Apps, and enable 'Install unknown apps' for your browser. This step is required only once and can be reversed after install.
Open the App and Sign In — Launch the j400f app, enter your account credentials or set up biometric login on first run, then explore the full lobby.
Enable Push Alerts — When prompted, allow notifications so you receive live-table and match alerts. You can adjust which alerts you receive at any time inside the app settings menu.

DEVICE REQUIREMENTS

Android, iOS and RAM — What You Need

The j400f app runs on most devices released in the past four years. Check the requirements below before downloading to confirm your phone meets the minimum spec for live-dealer streaming.

Auto-refresh hourly

Android Version

92%

Android 8.0 (Oreo) or above. Devices running Android 10 or later get the smoothest live-dealer video…

iOS Version

97%

iOS 13 or above. iPhone 8 and newer handle live-table streams at full quality; older models…

RAM

96%

Minimum 2 GB RAM. 3 GB or more is recommended for uninterrupted live casino sessions running…

Storage

95%

30 MB for the APK or iOS build.

Supported Regions

94%

Available to accounts registered in regions where local law permits access to j400f.

RTP percentages are informational reference values from provider documentation. Actual session outcomes vary.

INSIDE THE APP

A Look at What You See When You Open the App

From the moment you log in, the j400f app home screen organises live tables, slot rooms and your open bets into three tabs at the bottom.

Live lobby preview

Quick bet on sportsbook

Account and wallet access

Slot favourites list

Match tracker feed

Recent transactions view

Open Account Explore Lobby

Google Play App Store

APP HELP CHANNELS

Get Help When the App Has a Problem

If the app fails to install, crashes on launch, or you cannot log in after an update, our support team can walk you through a fix.

In-App Chat Open the app, tap the help icon at the bottom right, and start a live chat session. Chat agents are available around the clock and can see your device model from your account.

Email Support Send a description of the issue and your device model to the support address listed on j400f.co. Email responses are sent within four hours during business hours.

Install Troubleshooter Find step-by-step install error solutions in the Help section of the app. The troubleshooter covers unknown-source errors, profile trust issues on iOS, and crash-on-launch fixes.

APP SECURITY SIGNALS

How We Keep Your Account Safe Inside the App

Every build of the j400f app is code-signed before release, which means your device can verify the file has not been altered after it left our servers.

Code-Signed Builds

Each Android APK and iOS profile is signed with our private certificate. If the signature does not match, the device rejects the install before it runs a single line of code.

Single Official Source

We publish the app only on j400f.co. If you find the APK on another site, it is not our build and we cannot verify its contents — only download from our domain.

Device-Level Credential Storage

Biometric tokens are stored in your phone's secure enclave. The j400f app never transmits your fingerprint data to our servers — authentication happens entirely on the device.

Account Recovery via OTP

Lost your phone? The recovery flow sends a one-time code to your registered Indian mobile number and asks a security question before resetting access — no reliance on email alone.

Automatic Session Timeout

The app logs you out after 30 minutes of inactivity to prevent unauthorised access if your phone is left unlocked. You can adjust the timeout window in security settings.

Transport Encryption

All data between the app and our servers travels over TLS 1.3. This covers your betslip, deposit requests through UPI or Paytm, and live-table video streams.

App Experience Against Mobile Browser — Concrete Differences

Both options give you the full j400f lobby. The differences show up in loading speed, how login works, and whether your phone can alert you when a live…

Login speed

The app opens to the lobby in under three seconds using biometric login. The mobile browser requires a full page load and manual password entry each visit.

Push notifications

The app can alert you to a live table opening or a tracked match kick-off even when your screen is off. Browser-based alerts require the tab to stay open.

Offline lobby preview

Cached game data in the app lets you browse titles and read table details without a connection. The browser version needs a live connection to display the lobby.

Video streaming

Native GPU access in the app delivers live-dealer streams at lower data usage than the browser player while keeping frame quality consistent on a 4G connection.

Quick deposit shortcut

The app dashboard has a one-tap shortcut that opens UPI, Paytm or PhonePe deposit directly. On a browser you navigate to the cashier section manually each time.

Dark mode

The app switches to dark mode with one tap and follows your system setting automatically. The mobile browser reflects the site's standard colour scheme only.

Common Questions About the j400f App

Below are the questions our support team receives most often about downloading, installing and using the j400f app on Android and iOS devices in India.

Download the app directly from j400f.co on your phone browser. We do not publish on third-party APK sites or app stores, so the domain is the only source we can confirm as our own build.

Android blocks APK files not distributed through Google Play by default. You enable 'Install unknown apps' for your browser in Settings once, complete the install, and you can turn the setting off again immediately after.

Yes. iOS install uses a Safari browser prompt that adds a profile to your phone rather than downloading from the App Store. iOS 13 or above is required, and iPhone 8 or newer handles live-dealer streams at full quality.

After your first sign-in, go to Account Settings inside the app and tap 'Biometric Login'. The app links to your device's fingerprint or Face ID system and stores the token locally in the secure enclave — not on our servers.

Yes. Tap the wallet icon on the app dashboard, choose UPI, Paytm or PhonePe from the chip row, enter the amount, and confirm. Deposits typically clear before the next game round begins.

Uninstall the current version, download the latest APK from j400f.co, and reinstall. Your account data is stored server-side so nothing is lost. If the issue continues, reach our in-app chat support team.

Availability depends on local law in your state. Access is provided where applicable local regulations permit. Check the eligibility notice when you open the app for the first time on your device.