River vs Slack: Team Communication Comparison 2026

Compare River and Slack for team messaging. River offers a free-forever plan for small teams, while Slack's free tier has message limits. See pricing, features, and which fits your team best.

Updated 2026-09 · 2026

River

Simple team chat with unlimited message history on free plan

Freeforever (paid plans from $3/user/month)

Strengths

+Unlimited message history on free plan
+Clean, distraction-free interface
+Affordable paid tiers starting at $3/user/month

Weaknesses

-Smaller ecosystem of integrations compared to Slack
-Less mature feature set overall
-Smaller user community and fewer third-party resources

Best for

Small teams and startups wanting unlimited message history without paying Slack's prices, teams prioritizing simplicity over extensive integrations

Slack

Industry-standard team communication with extensive integrations

Freewith limits (Pro: $7.25/user/month)

Strengths

+Massive ecosystem of 2,600+ integrations
+Industry standard with widespread adoption
+Powerful search and organization features

Weaknesses

-Free plan limited to 90 days of message history
-Expensive at $7.25/user/month for Pro plan
-Can become overwhelming with notifications

Best for

Teams needing extensive integrations, companies with compliance requirements, organizations already invested in the Slack ecosystem

Feature Comparison

Feature	River	Slack
Message History	Unlimited on free plan	90 days on free plan
Free Plan Price	$0 (unlimited messages)	$0 (with 90-day limit)
Paid Plan Price	$3/user/month	$7.25/user/month
File Storage (Free)	5GB per workspace	5GB total
Integrations	50+ integrations	2,600+ integrations
Video Calls	Up to 10 participants	1:1 calls (free), unlimited (paid)
Screen Sharing	Yes	Yes
Guest Access	Yes (paid plans)	Yes (paid plans)
Workflow Automation	Basic	Advanced Workflow Builder
Mobile Apps	iOS, Android	iOS, Android
Search Functionality	Full search on free plan	Limited to 90 days on free
Enterprise Features	Limited	Extensive (SSO, compliance, etc.)

The Verdict

River is the clear winner for small teams on a budget who need unlimited message history without Slack's premium pricing. At $3/user/month versus Slack's $7.25, River offers 60% savings while maintaining core messaging features. However, Slack remains essential for teams requiring extensive integrations, enterprise compliance, or advanced automation—its ecosystem is unmatched, and for larger organizations, the extra cost may be justified by productivity gains from deep tool integration.

How to switch from River to Slack

1In River, go to Settings > Data Export and request a full workspace export; this generates a JSON file containing your channels, message history, and file attachments, delivered via download link once processing finishes.
2Create your new Slack workspace and set up your channel structure to mirror River's layout before importing anything, so message history lands in the right places.
3Use a migration tool (or Slack's Slackbot import for supported formats) to bring over the JSON export; note that River's export format isn't natively supported by Slack's built-in importers, so you may need a third-party migration service or manual CSV conversion for message history.
4Rebuild any River integrations and automations in Slack manually — Slack's Workflow Builder and its 2,600+ app integrations mean most of River's basic automations have a direct or better equivalent in Slack's App Directory.
5Invite your team to the new Slack workspace, re-add guest accounts if used, and set a firm cutover date after which River is used only for reference until the trial/export window closes.
6Archive or downgrade your River account once the team has fully moved to Slack and you've confirmed the exported history is accessible, to avoid paying for both tools simultaneously.

River vs Slack: common questions

How do I export my data from River before switching to Slack?+

River lets you export workspace data from Settings > Data Export, which generates a JSON archive of channels, messages, and uploaded files. This export can take a few hours to process for larger workspaces, and you'll get a download link via email once it's ready. Keep the export file backed up separately since Slack's importers expect a specific structure and you may need to reformat parts of it.

What do we lose by moving from River to Slack?+

You'll lose River's unlimited free message history if you stay on Slack's free tier, since Slack caps free workspaces at 90 days of searchable history. You'll also give up River's flat low-cost pricing ($3/user/month) for Slack's higher Pro tier ($7.25/user/month) if you want full history and unlimited integrations.

Is Slack's free plan actually enough for a small team?+

For teams of 2-10 people with light message volume, Slack's free plan can work, but the 90-day history limit means older conversations and shared files disappear from search. If your team relies on searching past decisions or onboarding new hires by reading history, you'll likely need Slack Pro at $7.25/user/month.

Does Slack integrate with the tools our team already uses?+

Yes — Slack has over 2,600 official integrations covering project management, CRM, dev tools, and calendars, far more than River's roughly 50. Check the Slack App Directory before switching to confirm your specific tools (e.g., your CRM or ticketing system) have a native integration rather than requiring a workaround.

How much more will Slack cost us over a year compared to River?+

For a 10-person team, River's paid plan runs about $360/year ($3/user/month) versus Slack Pro at roughly $870/year ($7.25/user/month), a difference of about $510/year. Multiply by your headcount to estimate the real gap, and factor in whether you actually need Slack's extra integrations and history enough to justify it.