Email APIs · side by side
Inboxroad vs SparkPost
Compare Inboxroad, SparkPost by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
0
Inboxroad
Custom / not listed
No priced plan for this volume · 0 emails
SparkPost
$0 / mo
Free · 0 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 | Inboxroad | SparkPost |
|---|---|---|
| Provider | Inboxroad B.V. | Bird |
| Billing unit | emails | emails |
| Plan at selected usage | No priced plan for this volume | Free |
| Monthly estimate | Custom / not listed | $0/mo |
| Workload | 0 emails | 0 emails |
| Free access | 1,000 free emails per month | Trial availability varies |
| Published plans | SMTP, Email, Email Pro | Free, Startup, Growth, Enterprise |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Inboxroad
- Inboxroad B.V.
- SparkPost
- Bird
Billing unit
- Inboxroad
- emails
- SparkPost
- emails
Plan at selected usage
- Inboxroad
- No priced plan for this volume
- SparkPost
- Free
Monthly estimate
- Inboxroad
- Custom / not listed
- SparkPost
- $0/mo
Workload
- Inboxroad
- 0 emails
- SparkPost
- 0 emails
Free access
- Inboxroad
- 1,000 free emails per month
- SparkPost
- Trial availability varies
Published plans
- Inboxroad
- SMTP, Email, Email Pro
- SparkPost
- Free, Startup, Growth, Enterprise
Prices checked
- Inboxroad
- 2026-10-08
- SparkPost
- 2026-10-08
Email APIs monthly cost
Inboxroad: Not pricedSparkPost: $0
Cost by emails
Cost curve data
| emails | Inboxroad | SparkPost |
|---|---|---|
| 0 | Not priced | $0 |
| 0 | Not priced | $0 |
| 0 | Not priced | $0 |
| 0 | Not priced | $0 |
| 0 | Not priced | $0 |
| 0 | Not priced | $0 |
| 0 | Not priced | $0 |
0
- Inboxroad
- Not priced
- SparkPost
- $0
0
- Inboxroad
- Not priced
- SparkPost
- $0
0
- Inboxroad
- Not priced
- SparkPost
- $0
0
- Inboxroad
- Not priced
- SparkPost
- $0
0
- Inboxroad
- Not priced
- SparkPost
- $0
0
- Inboxroad
- Not priced
- SparkPost
- $0
0
- Inboxroad
- Not priced
- SparkPost
- $0
Email APIs feature comparison
| Email APIs | Inboxroad | SparkPost |
|---|---|---|
| Sending domains | Not listed | 1 |
| Emails / month | Not listed | 1,000 |
| Webhook endpoints | Not listed | 1 |
| Sending IP | Not listed | Shared |
Sending domains
- Inboxroad
- Not listed
- SparkPost
- 1
Emails / month
- Inboxroad
- Not listed
- SparkPost
- 1,000
Webhook endpoints
- Inboxroad
- Not listed
- SparkPost
- 1
Sending IP
- Inboxroad
- Not listed
- SparkPost
- Shared
Which email providers fit your needs?
Inboxroad features & plan notes
- SMTP relay and REST APIs for marketing and transactional emails
- Dedicated IP addresses with automated IP warm-up schedules
- Per-ISP send-rate controls and integrated Feedback Loops (FBLs)
- Drag-and-drop campaign email builder and HTML editor
- Real-time event webhooks and delivery monitoring
SparkPost features & plan notes
- Deliverability analytics
- Enterprise scale
- Predictive signals
- No credit card
- 50/day cap
- 1 webhook endpoint
- 1 sending domain
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