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Paid plans start at $100/mo. There's also a free plan.
Sendblue’s Free Sandbox costs $0 per month and includes full API access, CLI and SDK support, community support and up to 10 verified contacts. It is inbound-first, so production use starts with the AI Agent plan at $100 per dedicated line per month. That plan includes up to 1,000 inbound contacts per day. Enterprise pricing is custom and is the listed option for full outbound messaging. The vendor does not publish annual prices or the cost of extra lines.
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
Additional phone lines
The AI Agent price is per line. Sendblue says additional lines are available, but does not publish their price; ask for a quote based on your expected line count.
Enterprise outbound
Full outbound messaging is listed under custom-priced Enterprise. Get a quote for your expected volume, line count and required features before budgeting.
Daily contact limits
AI Agent includes up to 1,000 inbound contacts per day. Confirm how Sendblue handles traffic above the cap and whether another line changes the limit.
Number porting time
Sendblue says porting an existing number into the service adds 3–5 days for setup. Ask whether your use case has additional setup requirements or costs.
03Which plan should you buy?
| If you are… | Get | Why |
|---|---|---|
| API testing and development | Free Sandbox | Costs $0 monthly and includes full API access, SDK and CLI support, and up to 10 verified contacts. |
| Inbound agent in production | AI Agent | Costs $100 per dedicated line monthly and includes webhooks, callbacks and up to 1,000 inbound contacts per day. |
| Outbound team at scale | Enterprise | The listed plan for full outbound messaging and multiple dedicated lines; pricing is custom. |
04Is Sendblue worth the money?
The free sandbox is a reasonable starting point for API integration work: it includes full API access, SDK and CLI support, and up to 10 verified contacts. For production inbound messaging, the published price is $100 per dedicated line monthly, with a 1,000-inbound-contact daily allowance. That per-line model is easy to understand, but the cost of extra lines is not published. Teams that need full outbound messaging must request custom Enterprise pricing. Get a quote and clarify contact limits before committing.
Sendblue pricing FAQ
Does Sendblue have a free plan?
Yes. The Free Sandbox costs $0 per month and includes full API access, CLI and SDK support, community support and up to 10 verified contacts. Messaging is inbound-first, so confirm whether its limits fit your development and testing workflow.
How much does Sendblue AI Agent cost?
The AI Agent plan costs $100 per dedicated line per month. It includes a dedicated phone number, up to 1,000 inbound contacts per day, inbound-first messaging, webhooks and callbacks, and unlimited messaging per line. Sendblue does not publish annual billing prices.
Does Sendblue charge extra for another phone line?
Sendblue says additional phone lines are available, and the AI Agent price is listed per line. The vendor does not publish the price for additional lines. Ask for a quote that covers your planned number of lines and expected daily contacts.
How much does Sendblue Enterprise cost?
Enterprise pricing is custom and is not listed as a fixed monthly price. The plan includes full outbound messaging and multiple dedicated lines. Ask Sendblue for a quote based on your deployment, and confirm the limits, support terms and any line charges in the offer.