Classic alerts in a mobile IRL setup
Classic stream alerts tell you about events like new followers, subscriptions, gift subs, bits, raids, memberships, or donations. In an IRL stream, though, you're not sitting at the OBS PC. The mobile video reaches OBS at home or on the production server over SRT, SRTLA, or RTMP.
The AlertBox is added there as a browser source. So you can react while you're out, the alert also has to get back to your smartphone and be audible through a Bluetooth speaker or headphones.
In this guide
1. How the IRL setup works
- Moblin, IRL Pro, or a mobile encoder sends picture and sound from wherever you are to the relay or production system.
- OBS receives the mobile stream and adds scenes, overlays, and the alert service's browser source.
- A platform event such as a follow, sub, raid, or donation triggers the AlertBox in OBS.
- OBS sends the finished program stream, alert included, to Twitch, YouTube, Kick, or another target platform.
- In parallel, StreamBuddy opens the alert page on the mobile smartphone. You hear the signal through a Bluetooth speaker or headphones.
2. Which alert service fits?
| Service | Best for | Assessment |
|---|---|---|
| StreamElements | Follows, subs, gift subs, bits, raids, donations, and overlays | Recommended all-round main option |
| Streamlabs | Classic AlertBox, donations, and ready-made designs | Well-known alternative with a browser source |
| Twitch Alerts | Twitch events straight from the Creator Dashboard | Simple, but limited to Twitch |
| Streamer.bot | Local triggers, actions, OBS control, chat commands, and custom alerts | Very flexible for your own automations on the production PC |
| BotRix | Alerts, widgets, and chatbot for several platforms | Interesting for Twitch, Kick, and other services |
| Ko-fi | Tips, memberships, sales, and support | An add-on, not a full platform AlertBox |
| Fourthwall | Shop purchases and memberships | Add-on through StreamElements or Streamlabs |
Moobot and Fossabot are mainly chatbots. They can announce events in chat or the dashboard, but they normally don't replace a full visual AlertBox in OBS.
3. Setting up AlertBox in OBS
- Sign in to the service you want and connect your streaming platform account.
- In the dashboard, create an AlertBox or overlay and configure follows, subs, raids, bits, or donations.
- Copy your personal browser source URL and keep it confidential.
- In OBS, go to Sources → Browser and create a new source named Stream Alerts.
- Paste the URL, set the size to match the OBS canvas, and enable Control audio via OBS.
- Place the alert source above the mobile video and test every event type you use.
- For other scenes, paste the same source as a reference or use one central nested alert scene.
4. Streamer.bot as the powerful main option
Streamer.bot is far more than a ready-made AlertBox. This local automation software can connect platform events, chat commands, and OBS actions into custom workflows. In an IRL stream especially, it lets you control alerts, scenes, sources, moderation, and other reactions centrally on the remote production PC.
Setup takes much more work than a simple browser source, so Streamer.bot has its own main guide. It also explains the web-based Streamer.bot Deck, which lets you trigger prepared OBS actions from a smartphone or tablet on the go, normally without opening a router port.
5. Hearing alerts on the go with StreamBuddy
You need some kind of feedback while you're out, even though OBS runs somewhere else. For that, you can also open the alert or overlay URL as a website tab in StreamBuddy for Android.
- Pair the Bluetooth speaker or headphones with the streaming smartphone, or with a second companion device.
- In StreamBuddy, go to Tabs → Add tab and create a new tab of type Website.
- Paste your personal alert URL and name the tab something like Stream Alerts.
- Trigger a test in the alert dashboard and check that the alert is audible both in OBS and on the go.
- Test screen timeout, battery saver mode, the mobile data connection, and automatic reloading after connection drops.
6. Bluetooth speaker or headphones?
| Output | Upside | What matters on an IRL outing |
|---|---|---|
| Bluetooth speaker | People with you and your surroundings hear the alert too | Keep distance from the mic, or you get a time-shifted echo |
| Single headphone | Clear feedback without sound in your surroundings | Keep hearing traffic and your surroundings safely |
| Second smartphone | Takes load off the streaming device | Needs extra battery, data connection, and a mount |
On motorcycle, bike, or street streams, safety comes first. An alert must not startle you, blast your ears, or cover ambient noise. Keep the volume low and don't adjust anything while you're moving. Audio in an IRL stream explains the whole audio path from the mic to the viewer.
Setting OBS audio to match the mobile output
- Bluetooth speaker is picked up by the IRL mic: Mute the alert browser source in the OBS audio mixer. Viewers hear only the speaker sound from the mobile signal.
- Headphones, or a speaker outside mic range: Leave the alert browser source on in OBS. Viewers hear the direct OBS audio, and you hear your mobile feedback.
- Before you start: Listen to a private test recording. The alert should appear in it exactly once.
7. Notes on the alert providers
StreamElements and Streamlabs
Both services give you a browser source URL for OBS. StreamElements is especially good for combined overlays; Streamlabs also offers a classic AlertBox with separate event types.
Twitch Alerts
The solution built into Twitch is simple and needs no extra alert provider. It only handles Twitch events, though, so it fits less well if you bring several platforms together.
BotRix
BotRix combines chatbot, widgets, and customizable alerts. In a cross-platform setup, test every event type you actually use before going live.
Ko-fi and Fourthwall
These services add external support, memberships, or shop purchases to your main AlertBox. For normal platform events, StreamElements, Streamlabs, Twitch Alerts, or BotRix stay in charge.
Official help: StreamElements, Streamlabs, Twitch Alerts, BotRix, and Ko-fi.
8. Testing and troubleshooting
- Trigger a test in the provider dashboard for each event type.
- Check that picture and sound show up in OBS and sit on the right output track.
- Make a local OBS test recording and listen to it afterward.
- At the same time, check StreamBuddy and the mobile speaker or headphones.
- Run a private test stream and have a second person check picture, volume, and delay.
| Problem | Cause | Fix |
|---|---|---|
| Viewers hear nothing | Browser source muted in OBS or wrong track | Check the OBS audio mixer and Advanced Audio Properties |
| You hear nothing | Website tab is asleep or wrong Bluetooth device | Reload StreamBuddy and check the media output |
| Alert plays twice | Multiple sources, or speaker sound is picked up by the mic | Use only one OBS source and move the speaker away from the mic |
| Only some events are missing | Event type disabled or platform account disconnected | Check the provider dashboard and the account connection |
Quick check before you start
- You have tested every event type you use.
- In the test recording, the alert plays exactly once.
- The alert URL doesn't appear anywhere on screen.
- StreamBuddy and the speaker or headphones keep working after a screen lock and a reload.
- Volume and duration are set so you can still hear speech and your surroundings.
9. Security, moderation, and privacy
- Treat personal browser source URLs like login credentials.
- Only use images, animations, and music you have sufficient permission to use.
- Limit alert volume and duration so speech and important ambient sounds stay audible.
- Moderate donation and text messages before problematic content is read aloud automatically or shown large on screen.
- Remove account links and permissions you don't need.
10. Common questions about stream alerts
Which alert service should I start with?
We recommend StreamElements as the main option. Streamlabs is a well-known alternative with a browser source. Set up one service completely before you add Ko-fi, Sound Alerts, or more browser sources. Alerts in an IRL stream gives an overview of everything.
Why do viewers hear the alert twice?
Usually the alert arrives by two paths: as an OBS browser source and as speaker sound that your phone mic picks up. Use only one. If the speaker is within mic range, mute the source in OBS. With headphones, leave it on.
Do I need StreamBuddy to hear alerts on the go?
On this page, StreamBuddy for Android is the way: you open the alert page as a website tab on your smartphone. What matters is that you have some return path that lets you hear the alert yourself. Test it before the stream. Lock the screen and reload after a connection drop.
Can I show or share my alert URL?
No. Treat your personal browser source URL like a password. Don't show it on stream, in screenshots, or in chat. If you think it got out, regenerate the URL in the service.
Are Twitch Alerts enough?
For Twitch alone, often yes. They are simple, and you don't need an extra provider. But they only know Twitch events. If you stream to several platforms, another service usually fits better. Either way, test every event type.
Alert guides for your next step
Sounds, memes, and videos triggered by viewers have a separate guide. Text-to-speech also has its own page, so classic alerts, sounds, and read-aloud messages don't get mixed up.
Stream alerts setup service & consulting
We help with choosing and setting up the AlertBox, OBS audio output, and mobile feedback through StreamBuddy, Bluetooth speaker, or headphones.