Fastmail vs OpenPhone
Compare Fastmail and OpenPhone on features, pricing, and buyer fit using the same researched criteria.
Fastmail
Privacy-focused business email, calendar and contacts with custom domains and shared addresses — Business Basic from $3/user/month annual; adjacent to business communications, not a phone system.
Best for
- • Small teams that want private, independent business email on their own domain
- • Owner-operators who need shared support@ addresses and shared calendars cheaply
- • Buyers who need an email retention archive for legal compliance (Professional)
Starting from $3.00/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
- ✓ CRM / CTI integrations
- ✓ Routing & IVR
Tie
- • WhatsApp Business
Choose Fastmail if: Small teams that want private, independent business email on their own domain
Choose OpenPhone if: SMB teams that want a modern shared business number with SMS and AI answering
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
Fastmail vs OpenPhone 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
Fastmail
OpenPhone
- User / licence minimumDepends
Fastmail
OpenPhone
- Number / country coverageOpenPhone
Fastmail
OpenPhone
- Power dialerOpenPhone
Fastmail
OpenPhone
- WhatsApp BusinessTie
Fastmail
OpenPhone
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 (2/10 vs 5/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
- → OpenPhone
Best for crm / cti integrations
OpenPhone leads on crm integrations (5/10 vs 8/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
The biggest differences
Where the products diverge most clearly on verified criteria.
Starting pricing
DependsFastmail
Fastmail researched starting price from $3/mo; OpenPhone researched starting price from $15/mo. Better value depends on seat minimums and add-ons.
OpenPhone
Fastmail researched starting price from $3/mo; OpenPhone researched starting price from $15/mo. Better value depends on seat minimums and add-ons.
WhatsApp Business
TieFastmail
Fastmail and OpenPhone have the same researched availability on whatsapp business (Fastmail: not-supported; OpenPhone: not-supported).
OpenPhone
Fastmail and OpenPhone have the same researched availability on whatsapp business (Fastmail: not-supported; OpenPhone: not-supported).
Power dialer
OpenPhone winsFastmail
Trails OpenPhone on this criterion
OpenPhone
OpenPhone leads on power dialer (2/10 vs 5/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
Routing & IVR
OpenPhone winsFastmail
Trails OpenPhone on this criterion
OpenPhone
OpenPhone leads on routing (5/10 vs 7/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
CRM / CTI integrations
OpenPhone winsFastmail
Trails OpenPhone on this criterion
OpenPhone
OpenPhone leads on crm integrations (5/10 vs 8/10) from approved SoftwareGlimpse editorial assessments — not hands-on lab testing.
Which should you choose?
Choose Fastmail if
- Small teams that want private, independent business email on their own domain
- Owner-operators who need shared support@ addresses and shared calendars cheaply
- Buyers who need an email retention archive for legal compliance (Professional)
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
Related comparisons
Alternatives to consider
SaneBox
Per-person email triage that filters existing mailboxes into SaneLater/SaneBlackHole folders — Snack, Lunch and Dinner tiers with 1, 2 and 4 mailbox caps; adjacent to business communications.
Zenzap
Professional work-chat app for frontline and multi-site teams replacing WhatsApp groups — free tier, Pro $3/user/month yearly, Business+ $8 with HIPAA, integrations and AI agents.
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.
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 Fastmail and OpenPhone?
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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