Email APIs · side by side
Resend vs UniOne
Compare Resend, UniOne by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
100K
Resend
$90 / mo
Scale · 100K emails
UniOne
$44 / mo
Standard · 100K emails
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 | Resend | UniOne |
|---|---|---|
| Provider | Resend | ECOMZ Holding Limited |
| Billing unit | emails | emails |
| Plan at selected usage | Scale | Standard |
| Monthly estimate | $90/mo | $44/mo |
| Workload | 100K emails | 100K emails |
| Free access | 3,000 emails/mo | 4-month free trial with 6,000 emails/month and 100 email validations; free testing tier allows up to 100 emails/day to v |
| Published plans | Free, Pro, Scale, Enterprise | Free Trial, Standard, Individual |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Resend
- Resend
- UniOne
- ECOMZ Holding Limited
Billing unit
- Resend
- emails
- UniOne
- emails
Plan at selected usage
- Resend
- Scale
- UniOne
- Standard
Monthly estimate
- Resend
- $90/mo
- UniOne
- $44/mo
Workload
- Resend
- 100K emails
- UniOne
- 100K emails
Free access
- Resend
- 3,000 emails/mo
- UniOne
- 4-month free trial with 6,000 emails/month and 100 email validations; free testing tier allows up to 100 emails/day to v
Published plans
- Resend
- Free, Pro, Scale, Enterprise
- UniOne
- Free Trial, Standard, Individual
Prices checked
- Resend
- 2026-10-08
- UniOne
- 2026-10-08
Email APIs monthly cost
Resend: $90UniOne: $44
Cost by emails
Cost curve data
| emails | Resend | UniOne |
|---|---|---|
| 0 | $0 | $0 |
| 25K | $20 | $6.00 |
| 50K | $20 | $6.00 |
| 100K | $90 | $44 |
| 200K | $155 | $119 |
| 500K | $425 | $344 |
| 1M | $875 | $719 |
0
- Resend
- $0
- UniOne
- $0
25K
- Resend
- $20
- UniOne
- $6.00
50K
- Resend
- $20
- UniOne
- $6.00
100K
- Resend
- $90
- UniOne
- $44
200K
- Resend
- $155
- UniOne
- $119
500K
- Resend
- $425
- UniOne
- $344
1M
- Resend
- $875
- UniOne
- $719
Email APIs feature comparison
| Email APIs | Resend | UniOne |
|---|---|---|
| Single sign-on | With add-on | Not listed |
| Daily limit | No limit | Not listed |
| Inbound emails | Not listed | |
| RESTful API | Not listed | |
| SMTP relay | Not listed | |
| Official SDKs | Not listed | |
| Schedule emails | Not listed | |
| Batch sending | Not listed | |
| Open tracking | Not listed | |
| Link tracking | Not listed | |
| React Email | Not listed | |
| Custom domains | 1,000 | Not listed |
| Additional domains | With add-on | Not listed |
| Dedicated IPs | With add-on | Not listed |
| Dedicated IP warming | Not listed | |
| Pristine shared IPs | Not listed | |
| Automatic suppression list | Not listed | |
| Bounce details | Not listed | |
| Multi-region | Not listed | |
| Data retention | 30 days | Not listed |
| Deliverability insights | Not listed | |
| DKIM, SPF, DMARC authentication | Not listed | |
| Webhook endpoints | 10 endpoints | Not listed |
| Webhook events | All events | Not listed |
| Social login | Not listed | |
| GDPR compliance | Not listed | |
| SOC 2 Type II certification | Not listed | |
| Penetration testing | Not listed | |
| DDoS protection | Not listed | |
| Automated backups | Not listed | |
| Multi-factor authentication | Not listed | |
| API key permissions | Not listed | |
| Signed webhook endpoints | Not listed | |
| Ticket support | Not listed | |
| Slack support | Not listed | |
| Urgent response SLA | Not listed | |
| Deliverability expertise | Not listed | |
| In-app documentation | Not listed | |
| AI assistant | Not listed | |
| AI credits / mo | 500 | Not listed |
Single sign-on
- Resend
- With add-on
- UniOne
- Not listed
Daily limit
- Resend
- No limit
- UniOne
- Not listed
Inbound emails
- Resend
- UniOne
- Not listed
RESTful API
- Resend
- UniOne
- Not listed
SMTP relay
- Resend
- UniOne
- Not listed
Official SDKs
- Resend
- UniOne
- Not listed
Schedule emails
- Resend
- UniOne
- Not listed
Batch sending
- Resend
- UniOne
- Not listed
Open tracking
- Resend
- UniOne
- Not listed
Link tracking
- Resend
- UniOne
- Not listed
React Email
- Resend
- UniOne
- Not listed
Custom domains
- Resend
- 1,000
- UniOne
- Not listed
Additional domains
- Resend
- With add-on
- UniOne
- Not listed
Dedicated IPs
- Resend
- With add-on
- UniOne
- Not listed
Dedicated IP warming
- Resend
- UniOne
- Not listed
Pristine shared IPs
- Resend
- UniOne
- Not listed
Automatic suppression list
- Resend
- UniOne
- Not listed
Bounce details
- Resend
- UniOne
- Not listed
Multi-region
- Resend
- UniOne
- Not listed
Data retention
- Resend
- 30 days
- UniOne
- Not listed
Deliverability insights
- Resend
- UniOne
- Not listed
DKIM, SPF, DMARC authentication
- Resend
- UniOne
- Not listed
Webhook endpoints
- Resend
- 10 endpoints
- UniOne
- Not listed
Webhook events
- Resend
- All events
- UniOne
- Not listed
Social login
- Resend
- UniOne
- Not listed
GDPR compliance
- Resend
- UniOne
- Not listed
SOC 2 Type II certification
- Resend
- UniOne
- Not listed
Penetration testing
- Resend
- UniOne
- Not listed
DDoS protection
- Resend
- UniOne
- Not listed
Automated backups
- Resend
- UniOne
- Not listed
Multi-factor authentication
- Resend
- UniOne
- Not listed
API key permissions
- Resend
- UniOne
- Not listed
Signed webhook endpoints
- Resend
- UniOne
- Not listed
Ticket support
- Resend
- UniOne
- Not listed
Slack support
- Resend
- UniOne
- Not listed
Urgent response SLA
- Resend
- UniOne
- Not listed
Deliverability expertise
- Resend
- UniOne
- Not listed
In-app documentation
- Resend
- UniOne
- Not listed
AI assistant
- Resend
- UniOne
- Not listed
AI credits / mo
- Resend
- 500
- UniOne
- Not listed
Showing 15 of 40
Which email providers fit your needs?
Resend features & plan notes
- React Email
- Simple API
- Webhooks
- All Pro features
- 1,000 domains
- Dedicated Slack channel
- 10 webhook endpoints
- 500 AI credits / mo
- SSO with add-on
- Dedicated IP with add-on
UniOne features & plan notes
- Email delivery via RESTful Web API and SMTP API
- Dynamic templating supporting Liquid, Velocity, and Simple template engines
- Drag-and-drop email builder with AI HTML editor and 200+ pre-built templates
- Real-time event webhooks, click/open tracking, and up to 100 days of analytics storage
- Integrated email validation API and automatic suppression list management
- 50 000 emails/month
- 24/7 support in live chat and via email
- Transactional emails
- Bulk/marketing email campaigns
- SMTP API allowing to start sending emails in mere minutes
- Versatile Web API with a comprehensive, clear documentation
- Integration libraries for Ruby, PHP, C#
- Ready-to-use email integrations with Bloomreach and Drupal
- SPF, DKIM, and DMARC authentication for senders’ domains
- SPF and DKIM authentication for tracking domains
- Template engines
- 200+ ready-made email templates
- Drag-and-drop visual email builder
- AI-powered HTML email editor
- Instant webhooks for events tracking
- Click tracking
- Unsubscribe tracking
- Address suppression management
- Custom unsubscribe link access
- Custom email campaigns tagging
- Real-time event tracking
- Up to 45 days of log retention
- Up to 100 days of analytics data storage
- Analytics CSV data export
- Email delivery, bounce, spam, & open rates
- Independent projects with individual API keys
- Up to 6,000 email address validations per month included
- Microsoft oAuth support
- Two-factor authentication
- GDPR Compliance
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