Email APIs · side by side
Mailgun vs Reply.io
Compare Mailgun, Reply.io by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
These providers bill in different units. Each estimate uses its own workload; there is no same-volume price winner.
Mailgun
100K
Reply.io
0
Mailgun
$90 / mo
Scale · 100K emails
Reply.io
$59 / mo
Email Volume · 0 active contacts
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Email APIs overview & pricing
| Email APIs | Mailgun | Reply.io |
|---|---|---|
| Provider | Sinch | ReplyApp Inc. |
| Billing unit | emails | active contacts |
| Plan at selected usage | Scale | Email Volume |
| Monthly estimate | $90/mo | $59/mo |
| Workload | 100K emails | 0 active contacts |
| Free access | 100 emails/day | None (14-day free trial available) |
| Published plans | Free, Basic, Foundation, Scale | Email Volume, Multichannel, Agency Core, Agency AI SDR, AI SDR Starter, AI SDR Growth, AI SDR Enterprise, Hybrid plan |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Mailgun
- Sinch
- Reply.io
- ReplyApp Inc.
Billing unit
- Mailgun
- emails
- Reply.io
- active contacts
Plan at selected usage
- Mailgun
- Scale
- Reply.io
- Email Volume
Monthly estimate
- Mailgun
- $90/mo
- Reply.io
- $59/mo
Workload
- Mailgun
- 100K emails
- Reply.io
- 0 active contacts
Free access
- Mailgun
- 100 emails/day
- Reply.io
- None (14-day free trial available)
Published plans
- Mailgun
- Free, Basic, Foundation, Scale
- Reply.io
- Email Volume, Multichannel, Agency Core, Agency AI SDR, AI SDR Starter, AI SDR Growth, AI SDR Enterprise, Hybrid plan
Prices checked
- Mailgun
- 2026-10-08
- Reply.io
- 2026-10-08
Email APIs monthly cost
Mailgun: $90Reply.io: $59
Different workloads, separate estimates
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Email APIs feature comparison
| Email APIs | Mailgun | Reply.io |
|---|---|---|
| Custom sending domains | 1,000 | Not listed |
| Log retention | 30 days | Not listed |
| Message retention | Up to 7 days | Not listed |
| Inbound routes | Full access | Not listed |
| Email validations | 5,000 included | Not listed |
| SAML SSO | Not listed | |
| Phone & chat support | Not listed | |
| Active Contacts | Not listed | Starts from 1.000 contacts |
| Mailboxes | Not listed | Unlimited |
| Email warm-ups in Mailtoaster.ai | Not listed | Unlimited |
| LinkedIn automation | Not listed | $69/month per account |
| Calls & SMS | Not listed | $29/month per user |
| Data credits / month | Not listed | 50 included |
| More Data Credits | Not listed | Paid Packages |
| Domain purchase | Not listed | |
| Email search extension | Not listed | |
| Email validation | Not listed | start from $20/month |
| Dialer and Cloud Calls | Not listed | $29/month per user |
| Live Data | Not listed | 50 credits + paid packages |
| Real time B2B data by Generect | Not listed | starting at $39/months |
| Onboarding with the CSM | Not listed | Included on annual |
Custom sending domains
- Mailgun
- 1,000
- Reply.io
- Not listed
Log retention
- Mailgun
- 30 days
- Reply.io
- Not listed
Message retention
- Mailgun
- Up to 7 days
- Reply.io
- Not listed
Inbound routes
- Mailgun
- Full access
- Reply.io
- Not listed
Email validations
- Mailgun
- 5,000 included
- Reply.io
- Not listed
SAML SSO
- Mailgun
- Reply.io
- Not listed
Phone & chat support
- Mailgun
- Reply.io
- Not listed
Active Contacts
- Mailgun
- Not listed
- Reply.io
- Starts from 1.000 contacts
Mailboxes
- Mailgun
- Not listed
- Reply.io
- Unlimited
Email warm-ups in Mailtoaster.ai
- Mailgun
- Not listed
- Reply.io
- Unlimited
LinkedIn automation
- Mailgun
- Not listed
- Reply.io
- $69/month per account
Calls & SMS
- Mailgun
- Not listed
- Reply.io
- $29/month per user
Data credits / month
- Mailgun
- Not listed
- Reply.io
- 50 included
More Data Credits
- Mailgun
- Not listed
- Reply.io
- Paid Packages
Domain purchase
- Mailgun
- Not listed
- Reply.io
Email search extension
- Mailgun
- Not listed
- Reply.io
Email validation
- Mailgun
- Not listed
- Reply.io
- start from $20/month
Dialer and Cloud Calls
- Mailgun
- Not listed
- Reply.io
- $29/month per user
Live Data
- Mailgun
- Not listed
- Reply.io
- 50 credits + paid packages
Real time B2B data by Generect
- Mailgun
- Not listed
- Reply.io
- starting at $39/months
Onboarding with the CSM
- Mailgun
- Not listed
- Reply.io
- Included on annual
Showing 15 of 21
Which email providers fit your needs?
Mailgun features & plan notes
- Email validation
- Inbound routing
- EU region
- SAML SSO
- 5,000 email validations
- Dedicated IP pools
- 30 days log retention
- Extra emails from $1.10 / 1,000
Reply.io features & plan notes
- Multichannel sequences across email, LinkedIn, calls, SMS, and WhatsApp
- Unlimited connected mailboxes with automated email warmup
- Autonomous AI SDR agent (Jason AI) for prospecting and meeting booking
- Comprehensive REST API and MCP server support for agentic sales automation
- Email Automation (∞ mailboxes, subject to Fair Usage Policy)
- LinkedIn Automation ($69 /mo/acct)
- Calls & SMS Automation ($29 /mo/acct)
- Email warm-up (Included with every mailbox)
- Unlimited emails
- 50 Live data credits/month
- Anti-spam & deliverability suite
How to compare email providers
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Browse Email APIs pricing