Email APIs · side by side
Plunk vs SparkPost
Compare Plunk, SparkPost by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
100K
Plunk
Custom / not listed
No priced plan for this volume · 100K emails
SparkPost
$80 / mo
Growth · 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 | Plunk | SparkPost |
|---|---|---|
| Provider | Plunk | Bird |
| Billing unit | emails | emails |
| Plan at selected usage | No priced plan for this volume | Growth |
| Monthly estimate | Custom / not listed | $80/mo |
| Workload | 100K emails | 100K emails |
| Free access | Developer free allowance | Trial availability varies |
| Published plans | Pay as you grow, Free forever | Free, Startup, Growth, Enterprise |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Plunk
- Plunk
- SparkPost
- Bird
Billing unit
- Plunk
- emails
- SparkPost
- emails
Plan at selected usage
- Plunk
- No priced plan for this volume
- SparkPost
- Growth
Monthly estimate
- Plunk
- Custom / not listed
- SparkPost
- $80/mo
Workload
- Plunk
- 100K emails
- SparkPost
- 100K emails
Free access
- Plunk
- Developer free allowance
- SparkPost
- Trial availability varies
Published plans
- Plunk
- Pay as you grow, Free forever
- SparkPost
- Free, Startup, Growth, Enterprise
Prices checked
- Plunk
- 2026-10-08
- SparkPost
- 2026-10-08
Email APIs monthly cost
Plunk: Not pricedSparkPost: $80
Cost by emails
Cost curve data
| emails | Plunk | SparkPost |
|---|---|---|
| 0 | $0 | $0 |
| 25K | Not priced | $15 |
| 50K | Not priced | $15 |
| 100K | Not priced | $80 |
| 200K | Not priced | Not priced |
| 500K | Not priced | Not priced |
| 1M | Not priced | Not priced |
0
- Plunk
- $0
- SparkPost
- $0
25K
- Plunk
- Not priced
- SparkPost
- $15
50K
- Plunk
- Not priced
- SparkPost
- $15
100K
- Plunk
- Not priced
- SparkPost
- $80
200K
- Plunk
- Not priced
- SparkPost
- Not priced
500K
- Plunk
- Not priced
- SparkPost
- Not priced
1M
- Plunk
- Not priced
- SparkPost
- Not priced
Email APIs feature comparison
| Email APIs | Plunk | SparkPost |
|---|---|---|
| Sending domains | Not listed | 1,000 |
| Emails / month | Not listed | 100K to 2.5M |
| Webhook endpoints | Not listed | 10 |
| Sending IP | Not listed | Dedicated IPs (add-on) |
Sending domains
- Plunk
- Not listed
- SparkPost
- 1,000
Emails / month
- Plunk
- Not listed
- SparkPost
- 100K to 2.5M
Webhook endpoints
- Plunk
- Not listed
- SparkPost
- 10
Sending IP
- Plunk
- Not listed
- SparkPost
- Dedicated IPs (add-on)
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)
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