Softwr

Communication · head to head

Slack vs Vonage

Slack logo

Slack

Communication

Where work happens

From
Free
Rated
-
Full reviewWebsite
Vonage logo

Vonage

Telecommunications

Communications API platform for messaging and voice

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Slack has a free tier, so it costs nothing to try first.
  • Each has a real cost: Slack 90-day message history limit on free plan results in important conversations disappearing; Vonage mMS pricing not published publicly, requires sales team quote
  • They diverge on capability: Slack covers Channels, Vonage covers SMS messaging.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Slack and Vonage actually diverge.

Attributes where Slack and Vonage differ
AttributeSlackVonage
Starting priceFreeOn request
Pricing modelUnknownusage-based
Free tierYesNo
PlatformsWeb, iOS, Android, macOS, Windows, LinuxAPI
CategoryCommunicationTelecommunications
Founded20092002

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Slack

  • Channels
  • Direct messaging
  • Voice & video calls
  • Screen sharing
  • File sharing
  • Search
  • Workflow builder
  • Slack Connect

Only in Vonage

  • SMS messaging
  • Voice API
  • Video API
  • Number management
  • Slack
  • AWS
  • Azure
  • Web support

Both cover

  • Salesforce

What people use each for

The jobs each tool is most often brought in to do.

Slack

  • Team communicationnot Vonage
  • Project coordinationnot Vonage
  • Customer support
  • Remote worknot Vonage
  • Cross-functional collaborationnot Vonage

Vonage

  • Customer engagementnot Slack
  • Lead generationnot Slack
  • Customer support
  • Sales automationnot Slack

Both are used for customer support, on those jobs the choice comes down to price and fit rather than capability.

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Slack

  • 90-day message history limit on free plan results in important conversations disappearing
  • Per-user pricing becomes expensive quickly for larger teams
  • Notification overload with 78% of employees feeling overwhelmed by notifications
  • Mobile app performance issues including lag and slow syncing
  • Huddles limited to 50 people and cannot be recorded
  • Requires dedicated video conferencing service for formal meetings and webinars

Vonage

  • MMS pricing not published publicly, requires sales team quote
  • International SMS rates can exceed $1.00 per message in some markets
  • Smaller developer ecosystem compared to Twilio

Pricing, plan by plan

Slack

Free

No published plan breakdown. See the Slack review.

Vonage

On request
  • Pay-as-you-go$0.05/month
    • SMS and voice
    • No monthly commitment
  • Starter$100/month
    • Volume discounts
    • Premium support
  • Enterprise$undefined/month
    • Custom pricing
    • Dedicated team

Which should you pick?

Choose Slack if

  • You need channels.
  • You want to start without paying.
  • You work on Web, iOS, Android, macOS, Windows, Linux.
  • You also want direct messaging.
Slack review

Choose Vonage if

  • You need sms messaging.
  • You work on API.
  • You also want voice api.
Vonage review

Questions people ask

Is Slack or Vonage better?
Neither clearly leads. Slack starts at Free and Vonage at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Slack or Vonage?
Slack has a free tier; the other does not. Paid plans start at Free for Slack and On request for Vonage.
Does Slack or Vonage run on more platforms?
Slack runs on Web, iOS, Android, macOS, Windows, Linux. Vonage runs on API.
Can I use Slack for free?
Yes. Slack has a free tier, so you can try it without paying. Vonage starts at On request.
What is Slack best used for?
Slack is most often used for team communication, project coordination, customer support, remote work. Of those, team communication and project coordination are not what Vonage is typically brought in for.
What can Slack do that Vonage cannot?
Slack covers Channels, Direct messaging, Voice & video calls, Screen sharing. Vonage covers SMS messaging, Voice API, Video API, Number management. Both handle Salesforce.

Answered from the vendors’ own pages

Slack: Does Slack have a free plan?

Yes, Slack offers a free plan indefinitely with no credit card required. Free users get 90-day message history, up to 10 app integrations, and 1:1 huddles.

Source
Vonage: How much does Vonage SMS cost?

Vonage SMS API costs $0.00809 per outbound message and $0.00649 per inbound message in the US. There is no monthly minimum. Virtual phone numbers cost around $4.18 per month.

Source
Slack: What are Slack's pricing plans?

Slack offers Free, Pro ($7.25/user/month with annual billing), Business+ ($12.50/user/month), and Enterprise Grid (custom pricing). Monthly billing costs approximately 20% more than annual.

Source
Vonage: What is Vonage Voice API pricing?

Voice API charges $0.00798/minute for US domestic calls. You pay per minute for calls made and received via the API.

Source
Slack: Does Slack support offline use?

Slack is a cloud-based platform and does not support robust offline work. Internet connectivity is required to access messages and collaborate.

Source
Vonage: How does Vonage compare to Twilio for SMS?

Vonage charges $0.00809 per SMS versus Twilio at $0.0083. Vonage is marginally cheaper for SMS-heavy workloads, while Twilio offers better developer experience and broader channel support.

Source
Slack: What integrations does Slack support?

Slack integrates with 43+ apps on average per team, including Google Drive, ChatGPT, Vercel, Asana, GitHub, and many others through their app marketplace.

Source
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