How to Stream Mobile Games to YouTube and Twitch at the Same Time Without a PC

You don't need a gaming PC, OBS, or a capture card to stream a mobile game to YouTube and Twitch at the same time.

With Castream, your phone can capture your game, microphone, and device audio and send a single live stream to Castream. Castream then distributes that stream to YouTube, Twitch, and any other destinations you've selected.

The setup looks like this:

Phone → Castream → YouTube + Twitch

Your phone only needs to produce one stream.

Quick Answer

To stream a mobile game to YouTube and Twitch at the same time:

Install Castream on your Android or iPhone.
Create or sign in to your Castream account.
Connect your YouTube channel.
Connect your Twitch channel.
Select both YouTube and Twitch as destinations.
Configure your video and audio settings.
Start screen capture.
Open your game and start playing.

Castream receives the stream from your phone and sends it to both platforms simultaneously.

No PC is required.

Step 1: Connect YouTube and Twitch to Castream

Open Castream and add your streaming destinations.

Connect:

Your YouTube channel
Your Twitch channel

Once both are configured, you can select them together when starting a stream.

Instead of starting one stream for YouTube and another for Twitch, you create a single broadcast and let Castream handle distribution.

Step 2: Configure Your Mobile Game Stream

Before going live, configure how you want your gameplay to look and sound.

Depending on your device, Castream supports options such as:

Portrait or landscape video
Video quality
Screen fit or fill
Device audio
Microphone audio
Device audio and microphone together

For most mobile game streams, you'll probably want both device audio and microphone audio.

That way viewers can hear the game while also hearing your commentary.

Step 3: Select YouTube and Twitch

Before starting the broadcast, select both YouTube and Twitch as destinations.

Your stream will then follow this path:

Mobile Game → Castream → YouTube

and

Mobile Game → Castream → Twitch

at the same time.

You don't need to run two streaming apps or encode two separate streams on your phone.

Step 4: Start Screen Capture

Start your screen broadcast from Castream.

Your phone will ask for permission to capture your screen.

Approve the request, then switch to the mobile game you want to stream.

Your gameplay becomes the video source while Castream continues handling the live broadcast.

Step 5: Start Playing

Once the stream is running, open your game and play normally.

Viewers on both YouTube and Twitch can watch the same gameplay stream at the same time.

You can use this setup for games such as:

Roblox
Minecraft
Fortnite
Call of Duty Mobile
PUBG Mobile
Mobile Legends
Clash Royale
Brawl Stars
Genshin Impact
Other Android and iPhone games

If it runs on your phone and can be captured through screen sharing, it can potentially become your live video source.

Can I Stream Game Audio and My Microphone at the Same Time?

Yes.

For supported mobile screen streaming setups, Castream can include device audio and microphone audio together.

That means your viewers can hear:

Game audio + your voice

instead of forcing you to choose between the two.

This is especially useful for gameplay commentary, reactions, tutorials, walkthroughs, and live interaction with viewers.

Does Multistreaming Make My Phone Upload Two Streams?

No.

This is one of the biggest advantages of using cloud multistreaming.

Your phone sends one stream to Castream.

Castream then distributes that stream to YouTube and Twitch.

Instead of:

Phone → YouTube

Phone → Twitch

your setup becomes:

Phone → Castream → YouTube + Twitch

This reduces the amount of work your phone and internet connection need to do compared with independently uploading a separate video stream to every platform.

Does Streaming to YouTube and Twitch Use Twice the Upload Bandwidth?

Not from your phone when using Castream's cloud distribution.

Your phone sends one video stream to Castream regardless of whether you've selected one destination or several.

Castream handles the additional outbound streams from its infrastructure.

For example, if your phone is uploading a 6 Mbps stream, adding another destination doesn't mean your phone suddenly needs to upload another 6 Mbps copy of the video.

That's particularly useful on mobile connections where upload bandwidth can be limited or inconsistent.

Do I Need OBS?

No.

OBS is commonly used for PC streaming because it can combine games, cameras, microphones, overlays, capture cards, and other sources.

But if the game itself is already running on your phone, you don't necessarily need to send everything through a computer first.

With Castream, your phone screen becomes the video source directly.

Do I Need a Capture Card?

No.

A capture card is useful when you need to capture video from another device and bring it into a computer.

For mobile screen streaming, Castream captures the phone's screen directly through Android or iOS screen broadcasting.

There is no need for:

HDMI adapters
Capture cards
USB video devices
A second computer

Can I Stream From Android?

Yes.

Castream supports Android screen streaming.

You can broadcast your Android screen while playing and include device audio, microphone audio, or both depending on your configuration.

This makes Android particularly useful for mobile game streaming because your phone can act as the complete streaming source.

Can I Stream From an iPhone?

Yes.

Castream also supports iPhone screen broadcasting.

You can start an iOS screen broadcast through Castream, switch to your game, and continue streaming while you play.

You don't need to mirror your iPhone to a Mac or PC first.

Can I Stream in Landscape Mode?

Yes.

For games designed to be played horizontally, you can stream in landscape orientation.

Castream also supports portrait-oriented screen streaming for games and apps designed vertically.

Your stream doesn't have to force mobile content into the wrong orientation.

Can I Stream to More Than YouTube and Twitch?

Yes.

YouTube and Twitch can simply be two of your selected destinations.

Castream is built for multistreaming, so the same source stream can be distributed to multiple configured destinations.

The basic architecture remains the same:

Your phone uploads once. Castream distributes the stream.

This is useful if you manage audiences across several platforms or multiple channels.

What Internet Speed Do I Need?

Live streaming depends more on stable upload bandwidth than extremely fast download speeds.

For mobile game streaming, your connection should comfortably support the bitrate you've selected.

For example, if you're sending a 6 Mbps stream, you don't want your connection barely reaching 6 Mbps upload.

You need enough extra capacity to absorb normal network fluctuations.

A strong Wi-Fi connection is usually preferable for long gaming sessions, although a good 5G or LTE connection can also work.

Will Streaming Affect Game Performance?

Any screen streaming application requires some processing power because your phone has to capture and encode video while also running the game.

Modern phones can generally handle this much better than older devices, but performance depends on:

Your phone
The game you're playing
Video resolution
Stream bitrate
Frame rate
Device temperature

If your phone starts struggling, reducing stream quality can lower the amount of processing required.

Why Use Cloud Multistreaming for Mobile Games?

Phones are powerful, but asking one to run a demanding game while encoding several independent live streams isn't exactly a kindness.

Cloud multistreaming changes the problem.

Instead of making your phone do this:

Game + encode YouTube + encode Twitch + upload everything

you can do:

Game + one stream → Castream

Castream takes care of distributing that stream to the destinations you've selected.

Your phone gets to focus primarily on the game and one outgoing broadcast.

Can I Stream Mobile Games Without a PC?

Yes.

That's the entire setup.

You can capture your game, add game audio and microphone commentary, and broadcast to YouTube and Twitch directly from your phone.

No OBS.

No PC.

No capture card.

No HDMI spaghetti monster living on your desk.

Just:

Phone → Castream → YouTube + Twitch

Start Streaming Mobile Games to YouTube and Twitch

If you want to build an audience on more than one platform, you don't need to choose between YouTube and Twitch every time you go live.

With Castream, you can stream your mobile game once and distribute the broadcast to both destinations simultaneously.

Install Castream, connect YouTube and Twitch, configure your screen and audio settings, select both destinations, and start playing.

Your phone creates the stream.

Castream handles the rest.