Streaming Overlays, Alerts & Chat Bots

The follower / subscriber alerts, on-screen chat, lower thirds, and Twitch chat moderation that sit on top of the stream. For OBS itself see Live Streaming Software. For multi-destination streaming see Multi-streaming. For VTube avatars see VTubing & Avatars. For the protocols underneath see Streaming Protocols. For OG / thumbnail images for stream metadata see OG Images.

Hosted overlay / alert platforms

• ★ StreamElements — closed source, paid free tier (essentially free for almost all use); cloud-hosted overlays, alerts, chat-bot, tipping page, store, leaderboards, song requests. Hosts your overlays so they don't tank your local CPU. Default for most streamers in 2026.
• ★ Streamlabs Cloudbot / Streamlabs Alertbox — closed source, paid free tier; the StreamElements rival; bundled with Streamlabs Desktop. Honest flag: same telemetry concerns as Streamlabs Desktop.
• Crowd Control — paid; chat-influences-the-game integrations (chat spawns enemies in the game you're playing).
• OWN3D Pro — paid; alert / overlay marketplace.
• Nerd or Die / Visuals by Impulse — paid template marketplaces.

Chat bots (moderation + commands)

• ★ Nightbot — closed source, free; the OG hosted chat bot for Twitch / YouTube / Trovo. Commands, timers, song requests, AutoMod-lite. Set it and forget it.
• ★ Streamer.bot — closed source, free Win-only (Wine works on Linux); local automation hub; the breakout 2024–26 tool: triggers from Twitch, YouTube, Discord, OBS, Spotify, MIDI, hotkeys; actions hit OBS-Websocket, audio playback, HTTP, Steam Deck — runs locally with no cloud dependency. Default for serious streamer automation in 2026.
• Mix It Up — free closed Win; alternative to Streamer.bot.
• Botisimo — paid free tier; cloud chat bot.
• Moobot — closed source freemium; older Twitch chat bot.
• Wizebot — closed source freemium.
• PhantomBot — GPL OSS; self-host Java chat bot; for the "I want a server I control" crowd.
• DeepBot — closed source paid; Windows desktop bot.
• SammiBot — closed source freemium; Streamer.bot competitor.

Local control / hotkey panels

• ★ Streamer.bot — see above; deep OBS-Websocket integration is the headline feature.
• Touch Portal — paid free tier; Stream Deck-style soft control panel on a phone / tablet; great if you don't own a Stream Deck.
• Loupedeck Live / Stream Deck — paid hardware; Elgato Stream Deck firmware now includes Streamer.bot integration.
• MIDI Controllers + OBS-Websocket — obs-midi-mg plugin maps MIDI knobs/pads to OBS sources.
• Companion (Bitfocus) — MIT OSS; broadcast-grade Stream Deck companion that controls everything (vMix, ATEM, OBS, X32, NDI). Free.

Browser-source overlays (custom HTML/CSS/JS in OBS)

• OBS Browser Source — free; render any URL on top of your scene. Local file or hosted.
• ★ HTML / CSS / JS templates — many streamers self-roll lower-thirds, recent-follower lists, chat overlays as small static sites and load them as browser sources.
• tmi.js — MIT OSS; Twitch chat client for browser source overlays.
• comfy.js — MIT OSS; simpler Twitch chat wrapper for overlays.
• sse-chat / kappagen — community OSS chat-overlay templates.
• OBS Web Socket + your own scripts — drive scene changes from any code.

Lower thirds / titles / graphics

• OBS Browser Source HTML — free; the universal pattern.
• ★ CasparCG Server — GPL OSS; broadcast-grade graphics + playback server; HTML5 / Flash legacy / image / video templates over OSC; what TV stations run for tickers and lower-thirds. See Live Production Switchers.
• vMix Title Designer — free with vMix; GT Designer-style titler.
• Singular.Live — paid free tier; cloud-hosted broadcast graphics; pairs with vMix / NDI.
• ProPresenter — paid; church / event presentation; many use it for lower thirds.
• Skylight by ProPresenter — paid; event graphics.
• NewBlue Titler — paid; AE-style titler that lives in vMix / Wirecast.

Tipping / monetization overlays

• StreamElements Tip Page — bundled free; PayPal / Stripe / crypto.
• Streamlabs Tipping — bundled free.
• Ko-fi — paid free tier; one-off tips + memberships.
• Throne — paid free tier; viewer-purchased gifts.
• BuyMeACoffee — paid free tier.
• Twitch Bits / YouTube Super Chat — platform-native; revenue split applies.

On-stream chat / engagement widgets

• StreamElements / Streamlabs chat overlay — bundled.
• Restream Chat — see Multi-streaming; merges chat across destinations.
• Twitch Streamer Dashboard — first-party.
• KapChat (Streamlabs) — chat overlay widget.
• Polls / Predictions — Twitch-native; or Crowd Control for game effects.
• Sound Alerts — paid; viewers spend channel points to play sounds.

Music for streams

• See Streaming Music & Licensing. Common picks: YouTube Audio Library (free), Pretzel Rocks (paid), Epidemic Sound (paid), Stream Beats by Harris Heller (free).

Patterns

• Cloud overlays = StreamElements; local automation = Streamer.bot. Most pro streamers use both.
• Mod via Nightbot for set-and-forget; mod via Streamer.bot for advanced workflows. Not exclusive.
• Avoid running too many local overlays as browser sources — each is a Chromium tab with a CPU/GPU cost.
• Use Companion (Bitfocus) if you have multiple control surfaces to unify them.

Pick this if…

• Default cloud overlays + alerts: StreamElements.
• Default chat bot, hosted, simple: Nightbot.
• Default local automation hub, 2026: Streamer.bot.
• Self-host chat bot: PhantomBot.
• Stream Deck on a phone: Touch Portal.
• Pro broadcast graphics, free OSS: CasparCG.
• Drive any control surface: Companion (Bitfocus).
• Custom HTML overlays: OBS Browser Source + your own static site.