Email APIs · side by side
SparkPost vs UniOne
Compare SparkPost, UniOne by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
100K
SparkPost
$80 / mo
Growth · 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 | SparkPost | UniOne |
|---|---|---|
| Provider | Bird | ECOMZ Holding Limited |
| Billing unit | emails | emails |
| Plan at selected usage | Growth | Standard |
| Monthly estimate | $80/mo | $44/mo |
| Workload | 100K emails | 100K emails |
| Free access | Trial availability varies | 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, Startup, Growth, Enterprise | Free Trial, Standard, Individual |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- SparkPost
- Bird
- UniOne
- ECOMZ Holding Limited
Billing unit
- SparkPost
- emails
- UniOne
- emails
Plan at selected usage
- SparkPost
- Growth
- UniOne
- Standard
Monthly estimate
- SparkPost
- $80/mo
- UniOne
- $44/mo
Workload
- SparkPost
- 100K emails
- UniOne
- 100K emails
Free access
- SparkPost
- Trial availability varies
- 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
- SparkPost
- Free, Startup, Growth, Enterprise
- UniOne
- Free Trial, Standard, Individual
Prices checked
- SparkPost
- 2026-10-08
- UniOne
- 2026-10-08
Email APIs monthly cost
SparkPost: $80UniOne: $44
Cost by emails
Cost curve data
| emails | SparkPost | UniOne |
|---|---|---|
| 0 | $0 | $0 |
| 25K | $15 | $6.00 |
| 50K | $15 | $6.00 |
| 100K | $80 | $44 |
| 200K | Not priced | $119 |
| 500K | Not priced | $344 |
| 1M | Not priced | $719 |
0
- SparkPost
- $0
- UniOne
- $0
25K
- SparkPost
- $15
- UniOne
- $6.00
50K
- SparkPost
- $15
- UniOne
- $6.00
100K
- SparkPost
- $80
- UniOne
- $44
200K
- SparkPost
- Not priced
- UniOne
- $119
500K
- SparkPost
- Not priced
- UniOne
- $344
1M
- SparkPost
- Not priced
- UniOne
- $719
Email APIs feature comparison
| Email APIs | SparkPost | UniOne |
|---|---|---|
| Sending domains | 1,000 | Not listed |
| Emails / month | 100K to 2.5M | Not listed |
| Webhook endpoints | 10 | Not listed |
| Sending IP | Dedicated IPs (add-on) | Not listed |
Sending domains
- SparkPost
- 1,000
- UniOne
- Not listed
Emails / month
- SparkPost
- 100K to 2.5M
- UniOne
- Not listed
Webhook endpoints
- SparkPost
- 10
- UniOne
- Not listed
Sending IP
- SparkPost
- Dedicated IPs (add-on)
- UniOne
- Not listed
Which email providers fit your needs?
SparkPost features & plan notes
- Deliverability analytics
- Enterprise scale
- Predictive signals
- 10 webhook endpoints
- 1,000 sending domains
- Dedicated IPs (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