Email APIs · side by side
Plunk vs Robotomail
Compare Plunk, Robotomail 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.
Plunk
Robotomail
Plunk
Custom / not listed
No priced plan for this volume · 100K emails
Robotomail
Custom / not listed
Custom / unlisted usage pricing · 50 inboxes
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 | Robotomail |
|---|---|---|
| Provider | Plunk | Robotomail |
| Billing unit | emails | inboxes |
| Plan at selected usage | No priced plan for this volume | Custom / unlisted usage pricing |
| Monthly estimate | Custom / not listed | Custom / not listed |
| Workload | 100K emails | 50 inboxes |
| Free access | Developer free allowance | Developer access varies |
| Published plans | Pay as you grow, Free forever | Free, Starter, Growth, Scale |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Plunk
- Plunk
- Robotomail
- Robotomail
- Plunk
- emails
- Robotomail
- inboxes
- Plunk
- No priced plan for this volume
- Robotomail
- Custom / unlisted usage pricing
- Plunk
- Custom / not listed
- Robotomail
- Custom / not listed
- Plunk
- 100K emails
- Robotomail
- 50 inboxes
- Plunk
- Developer free allowance
- Robotomail
- Developer access varies
- Plunk
- Pay as you grow, Free forever
- Robotomail
- Free, Starter, Growth, Scale
- Plunk
- 2026-10-08
- Robotomail
- 2026-10-08
Email APIs monthly cost
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 | Plunk | Robotomail |
|---|---|---|
| Sending methods | Not listed | Not listed |
| Inbound processing | Not listed | Not listed |
| Sending domains | Not listed | Not listed |
| Activity retention | Not listed | Not listed |
| Webhooks & events | Not listed | Not listed |
| Dedicated IP | Not listed | Not listed |
| Single sign-on | Not listed | Not listed |
| Support | Not listed | Not listed |
| Mailboxes | Not listed | Not listed |
| Monthly sending per mailbox | Not listed | Not listed |
| Daily per mailbox | Not listed | Not listed |
| Monthly inbound | Not listed | Not listed |
| Custom domains | Not listed | Not listed |
| Storage | Not listed | Not listed |
| Webhooks | Not listed | Not listed |
| SSE streaming | Not listed | Not listed |
| Dedicated IPs | Not listed | Not listed |
| MCP, CLI & API access | Not listed | Not listed |
- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
- Not listed
- Robotomail
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- Plunk
- Not listed
- Robotomail
- Not listed
- Plunk
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- Robotomail
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- Plunk
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- Robotomail
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- Plunk
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- Robotomail
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- Plunk
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- Robotomail
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- Plunk
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- Robotomail
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- Plunk
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- Robotomail
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- Plunk
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Which email providers fit your needs?
Robotomail features & plan notes
- Multi-tenant inboxes
- Event streaming
- Conversation threads
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