Fastmail vs respond.io
Compare Fastmail and respond.io 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.
respond.io is better for
- ✓ Power dialer
- ✓ WhatsApp Business
- ✓ CRM / CTI integrations
- ✓ Routing & IVR
Tie
- • Number / country coverage
Choose Fastmail if: Small teams that want private, independent business email on their own domain
Choose respond.io if: Support and growth teams that need WhatsApp plus other messaging channels in one inbox
respond.io
Omnichannel customer messaging platform (WhatsApp + other channels) with shared inbox and AI — Starter from $79/month annual-equivalent.
Best for
- • Support and growth teams that need WhatsApp plus other messaging channels in one inbox
- • Organisations running broadcasts and workflow automation across channels
- • Buyers who want AI Agents inside an omnichannel messaging platform
Starting from $79.00/user/mo
No free plan
Fastmail vs respond.io pricing
Fastmail researched starting price from $3/mo. respond.io researched starting price from $79/mo. Affiliate economics excluded.
Fastmail
From $3.00/user/mo
respond.io
From $79.00/user/mo
Fastmail
Starting from $3.00/user/mo
Free trial available
- Business Basic$3.00/user/mo
- $3/user/month billed annually ($4 monthly; $36 for 12 months). 5 GB for mail, calendar and contacts plus 1 GB file storage, custom business addresses on your domain, 24/7 human support.
- mail storage gb: 5
- file storage gb: 1
- Business StandardPopular$5.00/user/mo
- $5/user/month billed annually ($6 monthly; $60 for 12 months). 50 GB mail plus 10 GB files, shared email addresses like support@, layered shared calendars, shared company address book, offline support, scheduled send and snooze.
- mail storage gb: 50
- file storage gb: 10
- Business Professional$9.00/user/mo
- $9/user/month billed annually ($10 monthly; $108 for 12 months). 100 GB mail plus 50 GB files and an email retention archive for legal compliance.
- mail storage gb: 100
- file storage gb: 50
- Individual$5.00/mo
- $5/month billed annually ($6 monthly; $60 for 12 months) for a single mailbox with premium email, calendar and contacts.
- mail storage gb: 50
- file storage gb: 10
respond.io
Starting from $79.00/user/mo
Free trial available
- Starter$79.00/mo
- $79/month on yearly billing ($948/yr). Team & custom inboxes, AI Prompt/Assist, basic reports — omnichannel messaging entry.
- GrowthPopular$159.00/mo
- $159/month yearly ($1,908/yr). Broadcasts, workflow automation, AI Agents, advanced reports, Zapier/Make and developer API.
- Advanced$279.00/mo
- $279/month yearly ($3,348/yr). Multiple workspaces, SSO, webhooks, custom channels and advanced security.
- EnterpriseCustom
- Custom packaging — unlimited users, higher workspace/API limits. Contact sales.
Estimate your team cost
Monthly estimate from verified per-seat list pricing. Confirm on the vendor site before purchasing.
Fastmail
$45.00/mo
respond.io
$1,185.00/mo
+$1,140.00/mo — respond.io costs more
Verified monthly unit prices · Aug 17, 2026
Prices in USD
Shown per user / month from verified list pricing.
Plans can change
Confirm live vendor rates before purchasing.
Add-ons may apply
Calling, SMS, or usage fees can add cost.
Independence
Affiliate status never changes pricing outcomes.
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