OpenPhone vs Slack
Compare OpenPhone and Slack on features, pricing, and buyer fit using the same researched criteria.
OpenPhone
Modern SMB shared business phone (also branded Quo) with shared numbers, SMS and Sona AI — Starter from $15/user/month annual.
Best for
- • SMB teams that want a modern shared business number with SMS and AI answering
- • Founders and small sales/support teams who need transparent per-seat pricing without a 3-licence floor
- • Teams standardising on HubSpot/Salesforce once they move to Business
Starting from $15.00/user/mo
No free plan
VS
Our verdict
No universal winner. Choose based on which criteria matter most for your team.
OpenPhone is better for
- ✓ Number / country coverage
- ✓ Power dialer
- ✓ Routing & IVR
- ✓ Analytics
Slack is better for
- ✓ CRM / CTI integrations
Tie
- • WhatsApp Business
- • AI features
Choose OpenPhone if: SMB teams that want a modern shared business number with SMS and AI answering
Choose Slack if: Knowledge-worker teams that need channel-based team messaging as the primary collaboration hub
Slack
Channel-based team messaging platform — Free $0, Pro $7.25/user/month annual, Business+ $15, Enterprise+ contact sales; huddles for light video, not a phone system.
Best for
- • Knowledge-worker teams that need channel-based team messaging as the primary collaboration hub
- • Organisations that want a freemium chat workspace with a deep app ecosystem
- • Salesforce-centric companies aligning chat with CRM workflows
Starting from $7.25/user/mo
Free plan available
OpenPhone vs Slack at a glance
Criterion-level leaders from verified research.
Scorecard preview
Criterion leaders based on verified research — open the Scorecard tab for evidence detail.
- Starting pricingDepends
OpenPhone
Slack
- User / licence minimumDepends
OpenPhone
Slack
- Number / country coverageOpenPhone
OpenPhone
Slack
- Power dialerOpenPhone
OpenPhone
Slack
- WhatsApp BusinessTie
OpenPhone
Slack
Which business communications is better for you?
Quick picks based on fit — not a universal ranking.
- → OpenPhone
Best for number / country coverage
Stronger cloud phone availability
- → OpenPhone
Best for power dialer
OpenPhone leads on power dialer (5/10 vs 2/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
- → OpenPhone
Best for routing & ivr
OpenPhone leads on routing (7/10 vs 4/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
- → Slack
Best for crm / cti integrations
Slack leads on crm integrations (8/10 vs 10/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
The biggest differences
Where the products diverge most clearly on verified criteria.
Starting pricing
DependsOpenPhone
OpenPhone researched starting price from $15/mo; Slack researched starting price from $7.25/mo; a free plan is researched. Better value depends on seat minimums and add-ons.
Slack
OpenPhone researched starting price from $15/mo; Slack researched starting price from $7.25/mo; a free plan is researched. Better value depends on seat minimums and add-ons.
WhatsApp Business
TieOpenPhone
OpenPhone and Slack have the same researched availability on whatsapp business (OpenPhone: not-supported; Slack: not-supported).
Slack
OpenPhone and Slack have the same researched availability on whatsapp business (OpenPhone: not-supported; Slack: not-supported).
Power dialer
OpenPhone winsOpenPhone
OpenPhone leads on power dialer (5/10 vs 2/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
Slack
Trails OpenPhone on this criterion
Routing & IVR
OpenPhone winsOpenPhone
OpenPhone leads on routing (7/10 vs 4/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
Slack
Trails OpenPhone on this criterion
CRM / CTI integrations
Slack winsOpenPhone
Trails Slack on this criterion
Slack
Slack leads on crm integrations (8/10 vs 10/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
Which should you choose?
Choose OpenPhone if
- SMB teams that want a modern shared business number with SMS and AI answering
- Founders and small sales/support teams who need transparent per-seat pricing without a 3-licence floor
- Teams standardising on HubSpot/Salesforce once they move to Business
Choose Slack if
- Knowledge-worker teams that need channel-based team messaging as the primary collaboration hub
- Organisations that want a freemium chat workspace with a deep app ecosystem
- Salesforce-centric companies aligning chat with CRM workflows
Related comparisons
Alternatives to consider
CallHippo
SMB cloud phone system with a $0 starter rung, Starter from $18/user/month annual (2-user minimum), call recording and IVR from Professional, plus a separate call-centre plan ladder.
Aircall
Mid-market cloud phone and customer-conversation platform with deep CRM/helpdesk CTI, IVR, power dialer on Professional, and paid AI add-ons — 3-licence minimum.
Nextiva
SMB-friendly unified business communications — Core $15, Engage $25, Scale $75 per user/month annual, with messaging apps including WhatsApp and a Contact Center ladder from $75/agent.
Grasshopper
SMB virtual business numbers with extensions and apps — True Solo from $14/month annual (flat account, not per seat).
How we compare
A short look at the comparison process. Full methodology
1
Collect
Collect official product information, pricing, and product evidence.
2
Normalize
Map evidence to the same category evaluation criteria for both products.
3
Compare
Evaluate both products against identical criteria — ties and depends are allowed.
4
Explain
Show why each product wins, loses, or ties, with evidence behind the outcome.
Still deciding between OpenPhone and Slack?
Use Best communications software for a shortlist matched to your priorities, or build another side-by-side comparison.
- Independent criterion outcomes
- No invented scores or prices
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