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Paid plans start at $100/mo. There's also a free plan.
Sendblue offers a free sandbox for API testing and development. Its production AI Agent plan costs $100 per dedicated line per month and lists 1,000 inbound contacts per day, plus unlimited messaging per line. Enterprise pricing is custom; that plan is listed for outbound teams and high-volume deployments. The pricing page does not publish annual rates or the cost of additional phone lines, so $100 is a per-line starting point, not a complete quote.
01Every plan, line by line
| Plan | Billed annually | Billed monthly | Built for |
|---|---|---|---|
| Free Sandbox | — | $0 | API testing and development |
| AI Agent | — | $100 | Production inbound messaging |
| Enterprise | — | Quote | Outbound teams and high-volume deployments |
Add-ons and overages
- Additional phone lines are available; price not published.
02What the plan grid doesn't tell you
Extra phone lines
AI Agent costs $100 per dedicated line monthly. Sendblue says additional phone lines are available, but does not publish their price.
Outbound messaging
AI Agent is for production inbound messaging. Full outbound messaging is listed under Enterprise, which has custom pricing.
Daily contact limit
AI Agent lists 1,000 inbound contacts per day. Teams expecting more should confirm fit and pricing with Sendblue.
Annual billing
No annual billing price is published, so there is no disclosed annual rate to compare with the monthly price.
03Which plan should you buy?
| If you are… | Get | Why |
|---|---|---|
| Developers testing the API | Free Sandbox | Costs $0 and includes full API access, up to 10 verified contacts, inbound-first messaging, CLI and SDK support, and community support. |
| Teams handling inbound production messaging | AI Agent | Costs $100 per dedicated line monthly and includes webhooks, unlimited messaging per line, and 1,000 inbound contacts per day. |
| Outbound or high-volume teams | Enterprise | Includes full outbound messaging, multiple dedicated lines, SOC 2 and HIPAA, and a dedicated account manager; pricing is custom. |
04Is Sendblue worth the money?
Sendblue may be worth the $100-per-line price if your team needs an iMessage API with RCS and SMS fallback, webhooks, and production inbound messaging. The main pricing catch is that the AI Agent rate is per dedicated line, while extra-line pricing is unpublished. Its 1,000-inbound-contact daily limit is also worth checking against your volume. For outbound use, the published route is custom-priced Enterprise, so costs are harder to estimate upfront.
Sendblue pricing FAQ
Is Sendblue free?
Yes. The Free Sandbox is listed at $0 per month for API testing and development. It includes full API access, up to 10 verified contacts, inbound-first messaging, CLI and SDK support, and community support. It is separate from the paid production AI Agent plan.
How much does Sendblue AI Agent cost?
The AI Agent plan costs $100 per dedicated line per month, according to Sendblue’s pricing page. It is listed for production inbound messaging and includes webhooks and callbacks, 1,000 inbound contacts per day, and unlimited messaging per line.
Does the $100 plan include unlimited messages?
The AI Agent plan lists unlimited messaging per line, along with a limit of 1,000 inbound contacts per day. Those are separate listed terms: the pricing page does not say that the daily contact allowance is unlimited. Confirm how the plan fits your expected inbound volume.
How much does Sendblue Enterprise cost?
Enterprise pricing is custom and is listed for outbound teams and high-volume deployments. The plan includes full outbound messaging, multiple dedicated lines, SOC 2 and HIPAA, and a dedicated account manager. Sendblue does not publish an Enterprise rate or an additional-line price.