AgentPhone vs Sendblue

AgentPhone supports 44 of the 77 features compared here, and Sendblue supports 58.

Feature comparison

Feature	AgentPhone	Sendblue
iMessage messaging
iMessage	SupportediMessage lines are a separate number type (type=imessage).	Supported
Group chats	SupportediMessage groups arrive as one conversation with roster and sender; reply to the group id.	BetaGroup API is in beta on select plans. AI Agent plan can only reply in existing groups.
Group management	PartialStart a new group by listing recipients and rename it; adding or removing members is not documented.	BetaAdd and remove participants in iMessage groups via the beta groups API.
Group name and photo	PartialGroup name can be set by API; the group icon is only readable.	SupportedRename groups and set group photos on supported lines.
Mentions	Not listed	Not listed
Tapbacks	SupportedSix classic tapbacks, custom emoji on newer lines; inbound reactions via agent.reaction.	PartialSend classic tapbacks or any emoji. No inbound reaction events documented.
Threaded replies	Supportedreply_to_message_id; also on WhatsApp.	Supportedreply_to on V2 iMessage lines, in direct and group chats.
Typing indicators	SupportedSend only, best-effort, auto-expires after a few seconds.	SupportedSend and receive. iMessage 1:1 only, not in groups.
Read receipts	Not listedThe pricing page mentions read receipts; no API or webhook for them is documented.	PartialCan mark chats read (1:1). Outbound statuses stop at DELIVERED, with no read status.
Edit and unsend	Not listed	Not supportedDocs say editing is not supported via API and delete does not unsend.
Message effects	Supported12 screen and bubble effects via send_style.	Supported13 send_style values.
Animated text effects	Not listed	Not listed
Stickers	Not listed	Not listed
Formatted text	Not listed	Not listed
Attachments	SupportedImages, video and files by URL; several images arrive as a carousel on iMessage.	SupportedUp to 100MB on iMessage, 5MB on SMS.
Live Photos	Not listed	Not listed
Rich link previews	Not listed	PartialDocs say links expand only after the recipient saves your contact.
Voice messages	Not listed	SupportedSend .caf files to render as inline voice notes.
Contact cards	SupportedvCard files can be sent as media (listed as a supported MMS type).	SupportedSend .vcf files via media_url.
Polls	Not listed	Not listed
Chat backgrounds	SupportedSet or remove a background image per iMessage conversation.	Not listed
Location sharing	Not listedThe API has location endpoints returning coordinates per number, but their use is not described.	SupportedFind My request, read and live watch. Dedicated iMessage lines only.
iMessage apps	Not listed	SupportedApp Cards for your own Messages extension. V2 lines, not on the free plan.
Live app cards	Not listed	PartialUpdates go out as new messages in the same App Card session; Sendblue says the original is not edited.
Sender name and photo	PartialContact card sets a display name and avatar on the iMessage number; $250/month line only.	SupportedName and Photo Sharing profile per line, shared into direct iMessage chats.
FaceTime calls	Not listed	PartialOutbound FaceTime audio over WebRTC (Agora). Needs a purchased FaceTime line.
Delivery status	PartialMessages carry a status and failure reason; no delivery or read webhooks are documented.	SupportedStatus callbacks from REGISTERED through SENT or DELIVERED.
iMessage availability check	SupportedLive check of iMessage, SMS and RCS reachability for a number before sending.	SupportedLookup API checks a phone number or email for iMessage.
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportediMessage lines are ordered through the API and run by AgentPhone.	Supported
Dedicated numbers	SupportedUS and Canada numbers at $3/month; dedicated iMessage lines at $250/month.	Supported
Shared numbers	Not listed	SupportedFree sandbox uses a shared number with verified contacts only.
Bring your own number	Not listed	PartialOnly by porting the number in, which adds 3 to 5 days.
Line pooling	Not listed	SupportedNumber pooling with sticky sending. Automatic line selection needs account enablement.
SMS fallback	SupportedFalls back to SMS/MMS when iMessage is not available.	Supported
RCS fallback	SupportediMessage-capable numbers deliver over RCS or SMS to non-Apple recipients.	SupportediMessage, then RCS, then SMS. RCS on V2 lines.
Outbound-first messaging	PartialOutbound iMessage lines: 50 new contacts a day per line; inbound-only lines do not start chats; SMS needs 10DLC.	SupportedFull outbound on Enterprise or Blue Ocean; Free and AI Agent plans are inbound-first
Calls on the iMessage number	Not listed	SupportedDashboard calls and FaceTime from the texting number; API calls via your Twilio caller ID.
Other channels
SMS	SupportedSMS and MMS; inbound works at once, outbound needs 10DLC.	Supported
RCS	BetaRCS Business Messaging is beta and concierge-onboarded: branded sender, quick-reply chips.	SupportedV2 lines.
WhatsApp	BetaBeta, enabled per account. Connect your own WhatsApp Business Account; Meta bills you.	Not supportedNot offered
Telegram	Not supportedNot offered	Not supported
Slack	Not supported	Not listed
Email	Not supported	Not supportedNot offered. iMessage can be sent to Apple ID email addresses.
Phone calls	SupportedInbound and outbound calls in webhook mode or hosted AI mode; also browser web calls.	PartialNo native calling API. Dashboard calls, outbound via your Twilio caller ID, inbound forwarding.
Apple Messages for Business	Not supportedNot offered	Not supportedNot offered
Unified channel API	SupportedOne send endpoint for SMS, MMS, iMessage, RCS and WhatsApp; one agent.message webhook incl. voice.	SupportedOne API for iMessage, RCS and SMS, the only channels offered.
Developer tools
REST API	Supported	Supported
TypeScript SDK	Supportednpm install agentphone	Supportedsendblue on npm.
Python SDK	Supportedpip install agentphone	Supportedsendblue on PyPI.
Other SDKs	Not listedDocs list only TypeScript and Python; an agentphone-go repo holds only a placeholder README.	PartialGo, Rust and Ruby packages, listed as community packages.
CLI	Not listedNo own CLI found; numbers can be provisioned through the Stripe Projects CLI.	Supported@sendblue/cli: signup, messaging, contacts and webhooks.
Webhooks	SupportedProject default webhook with per-agent overrides.	Supported
Signed webhooks	SupportedHMAC-SHA256 over timestamp and body, with a timestamp header for replay protection.	PartialSends your shared secret in an sb-signing-secret header. No HMAC signature.
MCP server	SupportedHosted MCP server (mcp.agentphone.ai) and npm package agentphone-mcp.	Supportedsendblue-api-mcp via npx.
Open source	Not supportedClosed platform. The MCP server and framework integrations are MIT-licensed on GitHub.	PartialSDKs and CLI are MIT or Apache-2.0 on GitHub. The messaging platform is closed.
Self-hosting	Not supportedHosted cloud service only	Not listedSold as a hosted service on Sendblue's Apple devices; self-hosting is not mentioned.
Local testing	PartialBrowser web calls test a voice agent without a phone number; no message simulator found.	Not listed
Custom channel providers	Not listed	Not listed
Event replay	PartialFailed webhooks retry 5 times over about 20 hours; deliveries can be listed but not replayed.	PartialNo replay. Docs say to repair gaps by listing messages updated since a timestamp.
OpenTelemetry	Not listed	Not listed
No-code integrations	PartialAgentPhone block in Sim's no-code workflow builder; no Zapier, Make, n8n or GoHighLevel found.	SupportedZapier, Make and GoHighLevel. Docs FAQ says n8n resources are coming soon.
CRM integrations	Not listed	SupportedGoHighLevel, HubSpot, Salesforce, Close and Monday.com.
Built for AI agents
Agent framework	SupportedHosted voice mode runs calls from a system prompt; conversation state rides along in webhooks.	PartialNo own framework. Maintains a Vercel Chat SDK adapter.
Agent framework integrations	SupportedVercel Chat SDK adapter, LangChain, CrewAI and OpenAI Agents SDK tools, Google ADK guide.	SupportedSendblue-maintained Vercel Chat SDK adapter.
Streaming replies	PartialVoice only: NDJSON streamed webhook replies start speech on the first chunk.	Not supportedDocs say message editing is not supported via the API.
Agent group chats	PartialAgents can create and take part in iMessage groups; agent-to-agent groups are not described.	BetaA line can add another of your own dedicated lines to a group, via the beta groups API.
Human handoff	PartialVoice only: cold transfer of a call to a transferNumber, by the AI or your webhook.	SupportedShared team inboxes with assignment, and agents that escalate to a rep.
Audit logs	Not listed	PartialSecurity page says all API requests are logged. No customer-facing audit log documented.
Message history API	SupportedConversations with paginated messages and custom metadata; call transcripts.	Supported
Plans and compliance
Free plan	Partial$5 starting credit, no card. Outbound calls need a top-up first.	SupportedFree sandbox: shared number, up to 10 verified contacts, no webhooks.
Public pricing	Supported	SupportedAI Agent plan at $100/mo per line. Enterprise is custom.
No per-message fees	PartialiMessage lines and WhatsApp have no per-message charge; SMS is $0.02 a segment, MMS $0.03.	Supported
Uptime SLA	Not supportedTerms promise no uptime; SLAs only if set in an order or separate agreement.	Supported99.99% uptime SLA on the Enterprise plan
Isolated infrastructure	Not listedSub-accounts isolate agents, numbers and data per client; no dedicated infrastructure offer found.	SupportedA dedicated HIPAA instance for HIPAA customers
SOC 2 Type II	PartialSOC 2 Type I report as of July 30, 2026; Type II examination in progress.	SupportedSOC 2 Type II, report on request.
GDPR	SupportedPrivacy policy sets out GDPR legal bases for processing.	SupportedPrivacy policy says Sendblue adheres to GDPR. DPAs on request.

Checked on each provider's own site and docs on 2026-10-25. “Not listed” means the provider does not mention it.

Pricing

Which should you choose?

Choose AgentPhone if you need chat backgrounds, WhatsApp, local testing and streaming replies.

Choose Sendblue if you need read receipts, rich link previews, voice messages and location sharing.

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