Open-source web-based chat, honestly reviewed. Not a customer support widget — an XMPP client. That distinction matters more than anything else in this review.

TL;DR

What it is: A JavaScript XMPP client that runs in a browser. It connects to any XMPP server and gives you a chat UI — it is not a standalone chat server [README][website].
Who it’s for: Developers who already run (or want to run) an XMPP server and need a clean web-based frontend for it. Communities on XMPP infrastructure. Projects like PeerTube that need embedded chat [README].
License: MPL-2.0. You can self-host, modify, and embed it commercially. Less restrictive than GPL, requires modified files to stay open-source [README].
Cost savings: Converse.js itself costs $0. The XMPP server it connects to (Prosody, ejabberd) also costs $0. You pay for a VPS ($5–15/mo), a domain, and setup time — no per-seat or per-message fees ever.
Key strength: Protocol compliance. Converse.js implements 45+ XMPP Extension Protocols (XEPs), making it one of the most spec-complete XMPP web clients available. OMEMO end-to-end encryption, multi-user rooms, message archiving, file upload — all there [README].
Key weakness: You must have an XMPP server. Converse.js is a frontend, not a platform. If you don’t have XMPP infrastructure already, you’re setting up two systems, not one. Non-technical founders should read the deployment section before getting excited.

What is Converse.js

Converse.js is a web-based XMPP chat client written in JavaScript. XMPP (Extensible Messaging and Presence Protocol, also called Jabber) is a federated open protocol for messaging — the same way email lets anyone with any provider message anyone else, XMPP lets any XMPP client connect to any XMPP server and exchange messages with the broader network [README].

What Converse.js does specifically: it runs in a browser and provides a polished chat UI on top of any XMPP server connection. The project describes itself plainly: “a modern, feature-rich and 100% client-side XMPP chat app that runs in a web browser” [README]. You can run it as a full-page standalone app, as a chat overlay on top of your existing website, or as an embedded component inside a specific DOM element on a page [README].

This architecture matters: Converse.js without an XMPP server is a car without an engine. It renders nothing useful until you point it at an XMPP server. If you’re coming from tools like tawk.to or Tidio where you paste a script tag and have a working customer chat widget in five minutes, Converse.js is a completely different category of software [1].

The project is maintained by Opkode, a boutique software consultancy, and has 130+ contributors with a current version of 12.0.0 at the time of this review. It sits at 3,228 GitHub stars — a healthy number for a protocol-specific tool, though modest compared to full-platform alternatives like Rocket.Chat or Mattermost [README][website].

Why people choose it

The comparison to make here isn’t Converse.js versus Intercom or Tidio — those are customer support platforms with fundamentally different feature sets. The honest framing: people choose Converse.js because they already believe in XMPP, or they’re looking for an embeddable federated messaging client and don’t want to build one themselves.

The XMPP angle. XMPP is one of the oldest federated messaging protocols still in active use. Unlike Slack, Discord, or Teams, XMPP isn’t owned by any company. An account on one XMPP server can talk to accounts on any other server. This federation model means no vendor lock-in at the protocol level — a meaningful concern after years of Slack pricing increases and Teams bundling [1]. Converse.js is the polished web frontend for this ecosystem.

The embedding angle. The project has been integrated into PeerTube, Tiki Wiki CMS, Elgg, Roundcube, and WordPress, and works as a plugin for Openfire, Prosody, and ejabberd XMPP servers [README]. If you run one of these platforms, Converse.js is the fastest path to adding native XMPP chat. You’re not building a chat client from scratch.

The developer control angle. Converse.js exposes a plugin architecture based on pluggable.js and is built to be extended. Custom display modes, themes, behavior hooks — the documentation covers plugin development explicitly [website][docs]. This appeals to developers who want chat that integrates deeply into their product without paying for an API-limited SaaS widget.

What it’s not competing on. SaaSHub places Converse.js alongside tawk.to, Tidio, Crisp, Intercom, and Olark [1] — which are all “live chat for customer support on your website” tools. Converse.js can technically fulfill this use case (anonymous login + embedded mode + an XMPP room), but you’re doing significantly more infrastructure work to get there than you would with tawk.to, which is genuinely free and takes five minutes to set up.

Features

Core messaging:

Direct messages and multi-user chatrooms (XEP-0045, XEP-0402) [README]
Message corrections, retractions, and moderation [README]
Typing indicators and chat state notifications (XEP-85) [README]
URL previews (requires server-side support via mod_ogp or equivalent) [website]
Message styling with XEP-0393 formatting [README]
Message archiving (MAM, XEP-0313) — messages persist and sync across sessions [README]
Reactions, though XMPP reactions support varies by server [README]

Security:

OMEMO end-to-end encryption (XEP-0384) — the standard multi-device E2E encryption for XMPP [README][website]
Powerful moderator tools for chatrooms [website]
Anonymous login mode for guest access without registration [README]
Client certificate authentication (passwordless login) [docs]

Deployment modes:

Fullscreen — covers the entire browser viewport, acts as a standalone app [README]
Overlay — chat boxes float on top of your existing website, non-intrusive [README]
Embedded — integrates into a specific element in your page DOM [README]

Developer features:

Plugin architecture based on pluggable.js [website]
Comprehensive configuration options (documented at conversejs.org/docs) [docs]
Available as an npm package [README]
Converse Desktop and Converse Tauri releases for native-ish desktop use [README]

Protocol compliance:

45+ XMPP Extension Protocols (XEPs) implemented [docs]
WebSocket transport support (RFC-7395) [README]
Service discovery (XEP-0030), vCard support (XEP-0054), in-band registration (XEP-0077) [README]
HTTP File Upload for file sharing (XEP-0363) [README]

Internationalization:

Translated into 45+ languages [README][website]

Pricing: SaaS vs self-hosted math

There is no SaaS version of Converse.js — it is exclusively self-hosted software. Opkode offers paid professional support and custom development engagements, but no public pricing for those; you contact them via their website [website].

What you actually pay for:

Converse.js software: $0 (MPL-2.0) [README]
XMPP server (Prosody or ejabberd): $0 software license
VPS to run both on: $5–15/month on Hetzner or Contabo
Domain + SSL certificate: $10–15/year + Let’s Encrypt (free)

Comparison to the tools SaaSHub lists alongside it [1]:

tawk.to: $0/month for unlimited agents. Free. You don’t save money switching from tawk.to to Converse.js.
Tidio: Starts free, paid plans from $25/month. The AI automation features are the paid hook.
Crisp: $95/month for team tier, unlimited agents [1]
Intercom: $39+/month per seat, escalates rapidly at scale [1]

The cost argument for Converse.js is real only if you’re comparing against Intercom-tier products at scale, or if you’re running XMPP infrastructure anyway and just need a frontend for it. For a founder paying $0 on tawk.to’s free tier, the cost math doesn’t exist — you’d be adding infrastructure cost, not removing it.

Where Converse.js wins on cost: if your team uses XMPP internally (common in technical communities and privacy-focused organizations) and you want a web client for it without paying for hosted client software, the total cost is $0 beyond your existing server.

Deployment reality check

This is the section that matters most for the unsubbed.co audience.

What you need before touching Converse.js:

A running XMPP server — Prosody is the most commonly paired option, ejabberd for larger deployments
SSL/TLS configured for your XMPP domain (required for OMEMO encryption to work correctly)
SRV DNS records pointing to your XMPP server (this trips up almost everyone doing XMPP for the first time)
A web server to serve the Converse.js static files (nginx, Caddy)
If you want file sharing: an HTTP Upload component configured on your XMPP server
If you want message history: MAM (Message Archive Management) configured

Realistic time estimates:

For a developer comfortable with Linux, DNS, and XMPP: 2–4 hours to a working setup
For a technical founder who has Docker experience but has never set up XMPP: full day, probably two
For a non-technical founder: this is not a reasonable weekend project. Hire someone.

What can go sideways:

XMPP SRV record configuration is non-obvious. Getting federation working (connecting to other XMPP servers) requires correctly set _xmpp-client and _xmpp-server DNS records. Easy to misconfigure, hard to debug.
OMEMO encryption requires clients that support it. If someone tries to connect with an older XMPP client that lacks OMEMO, messages may fall back to unencrypted.
The anonymous login + embedded mode use case (for “website visitor chat room”) requires specific server-side configuration that isn’t covered in a five-minute tutorial.
Converse.js is version 12.0.0 with active development, but update cadence means you’ll occasionally need to pull updates and redeploy.

The project does offer a hosted demo at conversejs.org/fullscreen.html — useful for evaluation without touching infrastructure. You can test with an existing XMPP account before committing to self-hosting.

Pros and cons

Pros

Zero software cost, forever. MPL-2.0 means no licensing fees, no commercial-use restrictions on the client software itself [README].
Exceptional protocol compliance. 45+ XEPs implemented — you won’t hit protocol ceilings doing standard XMPP operations [docs].
OMEMO end-to-end encryption built in. Not bolted on, not a plugin — core feature [README][website].
Three display modes. Fullpage, overlay, and embedded modes make it adaptable to different integration scenarios without forking the code [README].
Genuinely pluggable. The plugin architecture is documented and used in production integrations (PeerTube, Roundcube) — not vaporware extensibility [README].
Federated by protocol. XMPP federation means your users can communicate with anyone on the XMPP network. No island effect [README].
45+ language translations. Broader l10n coverage than most comparable tools [README][website].
Active maintenance. 130+ contributors, CI testing visible on GitHub, version 12 indicates longevity [README].

Cons

Requires a separate XMPP server. This is not optional. Converse.js without an XMPP server does nothing. Every non-XMPP alternative in this category (Chatwoot, Rocket.Chat, tawk.to) ships the server [1].
XMPP learning curve is steep. SRV records, TLS configuration, MAM setup, federation configuration — these are not concepts a non-technical founder can absorb in a weekend.
Small GitHub footprint. 3,228 stars is honest for a protocol-specific tool but reflects a narrow audience. Compare to Matrix/Element at 20K+ stars or Rocket.Chat at 40K+.
No built-in user management UI. Adding users, resetting passwords, managing rooms — all handled at the XMPP server level, not through Converse.js. You’re operating two admin surfaces.
“Website live chat” use case is under-documented. The embedded anonymous chat room flow (most relevant for non-technical founders) requires significant server configuration not covered by the quickstart.
No mobile apps. Converse.js runs in a browser. The Converse Tauri app is in early releases. For mobile users, native XMPP apps exist (Conversations on Android) but aren’t part of the Converse.js package [README].
Third-party review coverage is thin. Compared to tools with thousands of Trustpilot or G2 reviews, Converse.js has minimal public third-party evaluation data — making it harder to gauge real-world production reliability from independent sources [1].

Who should use this / who shouldn’t

Use Converse.js if:

You’re already running an XMPP server (Prosody, ejabberd, Openfire) and want a modern web UI for it.
You’re building or maintaining a platform that has XMPP baked in (PeerTube, Tiki Wiki, Roundcube — already integrated [README]).
You care deeply about federated, open-protocol messaging and want to avoid proprietary platforms at the protocol level.
You’re a developer who wants to embed a customizable XMPP chat room in a web page and are willing to write plugins.
Your team runs on XMPP internally and you want a self-hosted web client that doesn’t require your users to install native apps.

Don’t use it if you want “customer chat on your website”:

tawk.to does this for free with a five-minute setup. There is no scenario where Converse.js wins on this use case for a non-technical founder.
Chatwoot (open-source, Docker-deployable, proper customer support platform) is the honest self-hosted answer to Intercom/Crisp.

Don’t use it if you want “team messaging”:

Mattermost or Rocket.Chat ship a complete platform with user management, channels, notifications, mobile apps, and integrations — in Docker, in one compose file.
Matrix/Element if you want a federated protocol similar to XMPP with broader modern adoption.

Skip it and pick Element/Matrix if:

You want federation + E2E encryption + modern UX + active ecosystem growth. Matrix has more momentum and broader adoption than XMPP in new deployments.

Alternatives worth considering

From the SaaSHub comparison page and the feature profile [1]:

tawk.to — Free live chat for websites. If your goal is “talk to website visitors,” this is the rational choice. No setup, no server, genuinely $0 [1].
Chatwoot — Open-source, self-hosted customer support platform. Docker-deployable. Real omnichannel inbox. The honest alternative for founders escaping Intercom at scale.
Element.io (Matrix) — The XMPP comparison point. Matrix is the federated protocol with more current momentum. Element is the web/desktop/mobile client. If you’re choosing a federated protocol today, Matrix has a larger developer ecosystem [1].
Rocket.Chat — Full self-hosted team messaging platform. Ships everything: server, web client, mobile apps, integrations. More complex to run than Converse.js + XMPP, but you get a complete product.
Mattermost — Slack alternative, self-hosted, MIT-licensed community edition. Designed for teams, ships as a single binary.
Wire — End-to-end encrypted messaging, partially open-source [1]. SaaS-first but with self-hosted options.
Snikket — A newer XMPP-based messaging platform (server + clients) designed to be easier to deploy than raw XMPP. If you want XMPP without the configuration pain, Snikket is the honest recommendation over Converse.js + Prosody from scratch.

Bottom line

Converse.js is the right tool for a specific job: a well-maintained, protocol-compliant, embeddable XMPP web client for people who have already committed to the XMPP ecosystem. At 3,228 stars and version 12, it’s mature software with real production usage — PeerTube and Roundcube integrations are not toy deployments. The MPL-2.0 license, 45+ language translations, OMEMO encryption, and three display modes make it a solid foundation if XMPP is your protocol.

The honest caveat: most founders reading this review don’t have an XMPP server and aren’t going to set one up. If you want self-hosted team messaging, Mattermost or Rocket.Chat ships a complete product. If you want self-hosted customer support chat, Chatwoot is the answer. If you’re genuinely interested in federated open-protocol messaging, take a serious look at Matrix/Element alongside XMPP before committing. Converse.js doesn’t lose on quality — it loses on accessibility. The setup complexity is a real barrier, and the “website live chat” use case that SaaSHub associates it with [1] requires XMPP infrastructure knowledge that most founders simply don’t have.

If you’re already running XMPP and want the best browser-based client for it, Converse.js is the answer. If XMPP is new to you, budget significant time — or hire someone who’s done it before.

Sources

SaaSHub — Converse.JS Alternatives & Competitors (software comparison directory, competitors listed: tawk.to, Tidio, Intercom, Element.io, Wire). https://www.saashub.com/converse-js-alternatives

Primary sources:

Converse.js Official Website — homepage, features, demos, professional support information. https://conversejs.org
Converse.js GitHub Repository — README, feature list, deployment instructions, XEP support table (3,228 stars, MPL-2.0 license, 130+ contributors). https://github.com/conversejs/converse.js
Converse.js Documentation — quickstart guide, configuration reference, plugin development, session management. https://conversejs.org/docs/html/index.html
Opkode — company behind Converse.js, professional support and custom development. https://opkode.com

Features

Integrations & APIs

Plugin / Extension System

Media & Files

File Attachments

Security & Privacy

Encryption
Privacy-Focused

Localization & Accessibility

Multi-Language / i18n

Mobile & Desktop

Responsive / Mobile-Friendly

Replaces

Discord

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