For a startup team's internal chat, Slack is the safer default: threads, search, integrations, shared channels with customers and admin controls are built for work. Discord fits better as a public community for users or developers, or for a small team that lives in voice channels and needs no admin features. Many startups use Slack inside and Discord outside.
Slack and Discord look alike at first glance: a sidebar of channels, messages, voice and video, bots. They were built for different people, though. Slack was designed for companies, with the company owning the workspace and its accounts. Discord grew up around gaming communities, where each person brings their own account and joins as many servers as they like. That origin shapes everything a startup cares about, from onboarding a hire to removing access when someone leaves.
I founded RemoteTeam, an HR platform for remote teams, and Gusto acquired it 580 days after incorporation. Remote work is one of the subjects I write about most, and team chat is the first tool a distributed team argues about. Prices below are from Slack's pricing page as of October 2026.
What is each tool built for?
Slack is a workplace messaging app. A company creates a workspace, invites people with work email addresses and controls who can see what. Channels, threads, search across history, huddles for quick calls, workflow automation and a large app directory connect it to the rest of a company's tools. Slack Connect lets you share a channel with another company: a customer, an agency, an investor or a design partner. How Slack changed how teams communicate covers why it replaced email for so many teams.
Discord is a community platform. Anyone can create a server for free, set up text, voice, forum and stage channels, and give members roles with detailed permissions. Voice channels are always on: people drop in and out instead of scheduling calls, which feels like sitting in the same room. Bots and the developer API make it easy to automate moderation, onboarding and announcements. How Discord grew from gaming chat to a community platform traces that shift.
Why do most startups use Slack for internal chat?
Because the boring features matter once a company has customers, investors and employees who come and go.
The company owns the accounts. When someone leaves, an admin removes them and their access ends. On Discord, people use personal accounts, so offboarding means removing a person's account from your server, and that account and its message history stay theirs.
Integrations. Most tools a startup buys, from code hosting to support desks to CRMs, offer a Slack app. Alerts, deploys and customer messages can land in the right channel without custom work.
Shared channels with other companies. Slack Connect is useful for B2B startups. A channel shared with a customer's team often gets faster answers than email.
Search and threads. Threads keep a busy channel readable, and search across files and messages makes Slack a rough record of decisions.
Admin and security on paid plans. Business+ adds SAML single sign-on and data exports for all messages. Those matter when a larger customer sends a security questionnaire.
The downside is cost and noise. Every seat is paid once the free plan's limits bite, and a busy Slack can become a place where people feel they must reply instantly. Set norms early: which channels are for urgent issues, and what can wait for a thread.
When does Discord make sense for a startup?
Discord earns its place in three situations:
A community around your product. Developer tools, games, AI products, creator tools and consumer apps often run a public Discord server where users ask questions, share work and talk to the team. Members already have accounts and already use the app, so joining takes a click.
A very small team on a zero budget. Discord costs nothing for unlimited message history, voice and screen sharing. A two- or three-person team building a prototype can work there happily.
Teams that live in voice. If your team likes to sit together in an open voice room while working, Discord's always-on voice channels do this better than scheduled calls.
The trade-offs are real. There is no single sign-on, no company-owned accounts, few compliance or retention controls, and far fewer business integrations. A startup that plans to sell to larger companies or handle customer data should move its internal chat to a work tool before those questions come up.
What does each cost?
Slack (per user per month, from its pricing page):
Free: $0, with messages saved and searchable for 90 days.
Pro: $7.25 billed annually, or $8.75 monthly. Adds unlimited message history and group conversations with other companies through Slack Connect.
Business+: $15 billed annually, or $18 monthly. Adds SAML single sign-on, data exports for all messages and more advanced AI features.
Enterprise plans are priced for large organizations.
Discord is free for servers. Nitro is an optional subscription each person can buy for personal perks such as larger uploads, and server boosts add perks to a server, but neither is needed to run a team or a community.
For a team of ten on Slack Pro paid annually, the bill is ten times the per-seat price every month. That is modest next to salaries, but it is the reason some very early teams start on Discord or on Slack's free plan and move later.
Should a startup use both?
Many do, and the split is easy to explain: Slack for the company, Discord for the community. Employees talk about roadmaps, customers and hiring in Slack, where the company controls access. Users talk to each other and to the team in Discord, where they already have accounts. A few team members take shifts answering in Discord, and a bot or a simple routine brings the important questions back into a Slack channel.
Keep a clear line between the two. Don't discuss customer data, security issues or investor matters in a public or semi-public Discord server. And don't make a community join Slack: it feels like a work tool, and members drift away.
If Slack isn't the only work option you are considering, the Slack vs Teams comparison for startups covers Microsoft's alternative. For the wider stack, including email, video and async updates, see the best communication tools for startups and the best communication tools for remote teams. More comparisons are in the technology section.
Frequently Asked Questions
Q:Is it allowed to use Discord for a business?
Yes. Many companies run public Discord servers for their users and communities. The limits are practical rather than legal: accounts belong to individuals, and Discord lacks the single sign-on, retention and export controls that work tools offer.
Q:What happens to old messages on Slack's free plan?
On the free plan, only the last 90 days of messages and files are visible and searchable. Slack has also said it deletes messages and files older than one year on free workspaces, so export anything you need to keep or move to a paid plan.
Q:Can a startup run all of its internal communication on Discord?
A tiny team can, especially before the first hire outside the founders. Once you need company-owned accounts, clean offboarding, integrations with work tools or answers for a customer's security review, a workplace tool such as Slack is the better fit.
Q:Is Slack worth paying for early on?
Pay when the free plan's limits start costing you: lost history, the need for shared channels with customers or partners, or security requirements. Until then, the free plan or a very small Pro team is usually enough.
Q:Which is better for a developer community?
Discord is usually the better choice for a public developer or user community, because most members already have an account and its roles, forums and voice channels suit large groups. Some B2B companies prefer a Slack community for professional audiences, but joining another Slack workspace adds friction for members.