IRC vs Discord vs Slack

The online communication landscape offers more options than ever, but three platforms consistently dominate the conversation: IRC, Discord, and Slack. Each serves different needs, different communities, and different philosophies about what online chat should be. This is not a hit piece on Discord or Slack, nor is it uncritical praise of IRC. This is an honest, detailed comparison to help you understand the strengths and weaknesses of each platform so you can make an informed choice about where to build your community and have your conversations.

Platform Overview

IRC (Internet Relay Chat) is an open protocol created in 1988 that enables real-time text communication. It is not a single service but a protocol that anyone can implement. Hundreds of independent IRC networks exist, each run by different organizations and communities. Networks like TwistedNET operate independently, setting their own policies and managing their own infrastructure.

Discord launched in 2015 as a voice chat platform for gamers and has since expanded into a general-purpose communication platform. It is a proprietary service operated by Discord Inc., a company that has raised over $600 million in venture capital funding. Discord offers text channels, voice channels, video calls, screen sharing, and a rich media experience with reactions, embeds, and integrations.

Slack launched in 2013 as a workplace communication tool and was acquired by Salesforce in 2021 for $27.7 billion. It is a proprietary platform focused on team collaboration, offering channels, direct messages, file sharing, integrations with business tools, and threaded conversations. Slack pioneered many features that other platforms later adopted.

The Comparison Table

Privacy: The Elephant in the Room

This is where the platforms diverge most dramatically, and where being honest requires acknowledging uncomfortable truths about the platforms many people use daily. For a deeper exploration of this topic, see our article on why privacy matters.

IRC with a zero-log policy, like the one enforced on TwistedNET, provides the strongest privacy guarantees of the three. Messages are delivered in real time and not stored on the server. With SSL encryption, your messages are protected in transit. No account is required to connect, no email address, no phone number. You can connect through a VPN or Tor for additional anonymity. The open protocol means you can verify exactly what data your client sends.

Discord stores all messages on its servers indefinitely. According to its privacy policy, Discord collects: message content, voice data metadata, IP addresses, device information, usage patterns, the content you view, and information from linked accounts. Discord scans messages for content moderation purposes. It shares data with law enforcement in response to legal requests and has acknowledged selling "anonymized" usage data. Discord requires an email address to create an account, and many servers require phone verification.

Slack stores all messages and makes them available to workspace administrators. On paid plans, administrators can export all messages, including private direct messages. Slack's privacy policy allows it to collect usage data, device information, and integration data. As a Salesforce company since 2021, Slack's data is subject to Salesforce's broader data practices and business interests.

The privacy comparison is not close. If privacy is a priority for you, IRC with a zero-log network is the clear choice. Discord and Slack are fundamentally surveillance-oriented platforms that monetize or make available the data you generate. IRC, particularly on networks like TwistedNET, treats your communications as ephemeral and private by default.

Performance and Resource Usage

In an era where chat applications routinely consume more resources than the operating systems they run on, performance matters. The differences between these platforms are stark.

A terminal-based IRC client like WeeChat or Irssi typically uses between 15 and 50 MB of RAM, even when connected to multiple servers and dozens of channels simultaneously. Graphical IRC clients like HexChat use around 50-100 MB. This is because IRC clients are doing exactly one thing: displaying text messages. There are no embedded browsers, no media renderers, no JavaScript engines consuming resources in the background.

Discord's desktop application is built on Electron, which means it runs an entire Chromium browser instance. In practice, Discord typically uses 300 to 800 MB of RAM, and CPU usage spikes during voice calls, video streams, and when rendering rich content. On a modest laptop, having Discord open alongside a few other applications can noticeably impact system performance and battery life.

Slack's desktop application is also Electron-based and suffers from similar resource consumption. Each Slack workspace you join adds to the memory footprint. Users connected to multiple workspaces commonly report Slack using 500 MB to over 1 GB of RAM. Slack has worked to optimize its performance in recent years, but the fundamental architecture remains resource-intensive.

For users on older hardware, users who value battery life on laptops, or users who simply do not want a chat application consuming the same resources as a modern video game, IRC is in a class of its own. The efficiency difference is not marginal; it is an order of magnitude.

Customization and Client Choice

IRC's open protocol means you have complete freedom in choosing your client software. There are dozens of IRC clients available across every platform: terminal clients like WeeChat and Irssi, graphical clients like HexChat and Konversation, web clients like The Lounge and KiwiIRC, and mobile clients like Revolution IRC and Goguma. Each client offers different features, different interfaces, and different levels of customization.

This client diversity is not just about choice for its own sake. It means you can find an IRC client perfectly suited to your workflow, your platform, and your preferences. A sysadmin can use WeeChat in a tmux session on a remote server, accessing it via SSH from any device. A casual user can use a polished web client. A power user can use a graphical client with custom themes and scripts. The protocol does not dictate the experience.

Discord and Slack, by contrast, require you to use their official clients. There is one Discord app for desktop, one for mobile, and the web interface. You cannot meaningfully customize the interface beyond choosing between light and dark mode. You cannot write plugins that modify the client behavior (Discord's terms of service explicitly prohibit client modifications). You experience the platform exactly as the company intends, and if you do not like a design change, your only option is to accept it.

Self-Hosting and Community Governance

One of IRC's most significant advantages is that anyone can run their own server or network. The IRC server software is open source (popular options include UnrealIRCd, InspIRCd, and Ergo), well-documented, and relatively straightforward to set up. This means communities can own their infrastructure, set their own policies, and are never at the mercy of a corporate entity's business decisions.

Discord is a centralized service. You cannot self-host Discord. Your "server" on Discord is not actually a server; it is a namespace on Discord's infrastructure. Discord can (and does) shut down servers that violate its terms of service, which it can change at any time. If Discord goes bankrupt, pivots its business, or simply decides to make changes you disagree with, you have no recourse. Your community data, your history, your member list, all of it exists solely on Discord's servers under Discord's control.

Slack offers a self-hosted option through Enterprise Grid, but only for large organizations willing to pay enterprise pricing. For the vast majority of users and communities, Slack is a centralized, hosted service with the same single-point-of-failure risks as Discord.

The Freenode debacle of 2021 demonstrated IRC's resilience in the face of governance disputes. When the network's ownership changed hands and the new owner acted against the community's interests, the staff and users simply migrated to a new network (Libera.Chat) within days. This kind of community mobility is impossible on Discord or Slack, where your community identity, history, and integrations are locked into the platform.

Bot Ecosystem and Automation

All three platforms support bots and automation, but the approaches differ significantly. IRC's bot ecosystem is the most open. Since IRC is a simple text-based protocol, you can write a bot in literally any programming language that can open a TCP socket. There are established bot frameworks in Python, JavaScript, Go, Rust, Perl, and many others. IRC bots can be as simple as a ten-line script or as complex as a full-featured service.

Discord's bot API is well-documented and supports rich interactions including buttons, select menus, modals, and slash commands. Discord bots can play audio, manage roles, create embeds, and interact with Discord-specific features. The ecosystem is large and mature, with libraries like discord.js and discord.py making development accessible. However, Discord's bot API is proprietary, and Discord can change it at any time, as they have done repeatedly.

Slack's bot ecosystem is oriented toward business integrations. The Bolt framework supports JavaScript, Python, and Java. Slack bots excel at workflow automation, integrating with business tools, and providing interactive messages within the Slack interface. However, Slack has become increasingly restrictive about bot capabilities, and many features require paid plans.

The key difference is freedom and longevity. An IRC bot you write today will work on any IRC network, with any IRC server software, indefinitely. The protocol has remained backward-compatible for over 35 years. A Discord bot is subject to Discord's API changes, rate limits, verification requirements, and terms of service. Discord has repeatedly broken existing bots with API updates and added requirements like privileged intents that force developers to apply for approval.

Where Each Platform Excels

Being honest means acknowledging that each platform has genuine strengths that suit different use cases. No platform is best for every situation.

IRC is best for: Privacy-conscious users who do not want their conversations logged or analyzed. Technical communities that value lightweight, customizable tools. Users who want persistent connections via SSH and terminal multiplexers. Open-source projects that value open protocols and community independence. People who want to chat without creating accounts or providing personal information. Users on limited hardware or bandwidth. Anyone who believes communication tools should not require surveillance as a business model.

Discord is best for: Gaming communities that need integrated voice chat. Groups that want a polished, all-in-one platform with minimal setup. Communities that rely heavily on rich media, embeds, and interactive features. Users who want an easy mobile experience with push notifications. Communities that benefit from Discord's discovery features for growth. Groups that want built-in moderation bots and role management with minimal technical knowledge.

Slack is best for: Workplace teams that need integration with business tools like Jira, GitHub, Google Workspace, and Salesforce. Organizations that require administrative control over communications. Teams that rely heavily on threaded conversations for project management. Businesses that need compliance and data retention features. Enterprise environments where SSO and identity management are requirements.

The Pricing Reality

IRC is free. Not "free tier with limitations" or "free but we sell your data." IRC is free as in freedom and free as in cost. Networks like TwistedNET are run by volunteers, supported by the community, and will never charge you for access. Every user gets the full experience with no artificial limitations.

Discord's free tier is generous but comes with limitations. File uploads are capped at 25 MB, streaming quality is limited to 720p at 30fps, and you get a basic set of emoji slots and stickers. Discord Nitro costs $9.99/month and raises these limits. Server boosts (starting at $4.99/month) unlock additional features for specific servers. For communities, the real cost is not monetary but rather the privacy trade-off of using a platform funded by venture capital and data monetization.

Slack's free tier has become increasingly limited over time. Free workspaces can only access the most recent 90 days of message history (reduced from 10,000 messages in 2022). Free tier limits integrations to 10 apps and restricts file storage. Slack Pro costs $7.25 per user per month, and Slack Business+ costs $12.50 per user per month. For a team of 50 people, that is $4,350 to $7,500 per year, just for text chat. Enterprise Grid pricing is not publicly listed but starts significantly higher.

Accessibility and Learning Curve

In the interest of fairness, IRC has a steeper learning curve than Discord or Slack. There is no way around this. Discord and Slack are designed to be immediately usable by anyone who can install an app and create an account. The interfaces are polished, intuitive, and require no technical knowledge. This accessibility is a genuine strength.

IRC, especially with a terminal client, requires some initial setup: choosing and installing a client, configuring a server connection, learning basic IRC commands, and understanding concepts like channels and NickServ. However, this learning curve has been significantly reduced by modern clients and resources. Web-based clients like TwistedNET's WebIRC let you start chatting with zero installation. Our IRC guide walks beginners through everything they need to know. And once you are set up, IRC's simplicity becomes an advantage rather than a limitation.

On the accessibility front, IRC's text-based nature actually provides advantages for screen reader users. Terminal IRC clients work well with screen readers because they output plain text without the complex visual layouts that can confuse accessibility tools. Discord and Slack have improved their accessibility in recent years but still present challenges for users who rely on assistive technology.

The Verdict: It Depends on What You Value

There is no single "best" chat platform. The right choice depends entirely on what you value. If you value privacy, freedom, efficiency, and community independence, IRC is the clear winner. If you need rich media, voice chat, and a low-barrier entry point for a diverse community, Discord has genuine advantages. If you need enterprise-grade workplace communication with business tool integrations, Slack is purpose-built for that.

What concerns us is not that Discord and Slack exist, but that many people use them without understanding the trade-offs they are making. Every message on Discord is stored, analyzed, and available to the company indefinitely. Every conversation on Slack can be exported by administrators. These are not bugs; they are features of platforms built on business models that require access to your data.

IRC offers a different model: one where the protocol is open, the clients are diverse, the networks are independent, and privacy is the default. It has thrived for over 35 years because these qualities matter. Networks like TwistedNET demonstrate that modern IRC can provide a comfortable, welcoming experience without sacrificing the principles that make the protocol special.

You do not have to choose one platform exclusively. Many people use Discord for gaming, Slack for work, and IRC for the conversations they want to keep truly private. The important thing is that you make that choice consciously, understanding what each platform costs you, not just in money, but in data, in freedom, and in the kind of internet you are helping to build.