What is the difference between AgentPhone and Miss Blue?

AgentPhone supports 44 of the 77 features compared here, and Miss Blue supports 47. AgentPhone adds message effects, contact cards, chat backgrounds, WhatsApp and TypeScript SDK. Miss Blue adds read receipts, edit and unsend, voice messages, location sharing and FaceTime calls.

Does Miss Blue support message effects?

Miss Blue does not support message effects.

Does Miss Blue support contact cards?

Miss Blue does not list contact cards on its site or in its docs.

Does Miss Blue support chat backgrounds?

Miss Blue does not list chat backgrounds on its site or in its docs.

AgentPhone vs Miss Blue

Q: How much do AgentPhone and Miss Blue cost?

AgentPhone: Pay as you go with $5 of starting credit: $3 per number a month, $0.13 to $0.22 a voice minute and $0.02 per SMS segment, with iMessage lines at $150 or $250 a month and no per-message charge. Miss Blue: A free sandbox for testing, then $99 per dedicated number per month at the launch price (normally $198), with the usual $479 setup fee waived until October 31; FaceTime Audio ($250), phone calls ($75) or both ($300) are optional add-ons per line, and Enterprise is custom.

Compare AgentPhone and Miss Blue side by side: iMessage features, channels, developer tools, pricing and compliance, checked on each provider's own site.

AgentPhone

Phone numbers with voice, SMS and iMessage for AI agents

Starting price: $3/month per number plus usage; iMessage from $150/month per line
Free plan: $5 starting credit, no card required

Visit AgentPhone Read more

Miss Blue

Dedicated iMessage line with API, team inbox and calling

Starting price: $99/month per number (launch price)
Free plan: Free sandbox; 30-minute live demo line

Visit Miss Blue Read more

AgentPhone supports 44 of the 77 features compared here, and Miss Blue supports 47.

Where AgentPhone is ahead

and 2 more in the table below.

Where Miss Blue is ahead

and 5 more in the table below.

Feature comparison

Feature	AgentPhone	Miss Blue
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.	SupportedSend into an existing group by its chat_id and read group threads.
Group management	PartialStart a new group by listing recipients and rename it; adding or removing members is not documented.	SupportedCreate groups of 2 to 32 and add or remove members; leaving a group is not supported yet.
Group name and photo	PartialGroup name can be set by API; the group icon is only readable.	SupportedRename a group and set or remove its photo.
Mentions	Not listed	Not listed
Tapbacks	SupportedSix classic tapbacks, custom emoji on newer lines; inbound reactions via agent.reaction.	SupportedAdd or remove the six tapbacks; tapbacks from customers appear on the message.
Threaded replies	Supportedreply_to_message_id; also on WhatsApp.	SupportedQuoted replies with reply_to_message_id.
Typing indicators	SupportedSend only, best-effort, auto-expires after a few seconds.	SupportedSend typing, optional auto-typing on inbound iMessage, and contact typing via webhook.
Read receipts	Not listedThe pricing page mentions read receipts; no API or webhook for them is documented.	SupportedExplicit read receipts by API; outbound messages report read.
Edit and unsend	Not listed	PartialUnsend within Apple's 2-minute window. An edit endpoint is documented, but the FAQ says editing is not supported yet.
Message effects	Supported12 screen and bubble effects via send_style.	Not supportedThe errors page says effects are not a supported API operation yet.
Animated text effects	Not listed	Not supportedThe errors page says expressive text styles and effects are not supported yet.
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.	SupportedImages, video, PDFs, Office files and more up to 100 MiB, one per send, or carousels of 2 to 20 images.
Live Photos	Not listed	Not listed
Rich link previews	Not listed	Not listed
Voice messages	Not listed	SupportedAudio-only sends use the native voice-note bubble by default.
Contact cards	SupportedvCard files can be sent as media (listed as a supported MMS type).	Not listed
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.	SupportedSend Find My requests, read the sharing state and watch live fixes over Server-Sent Events.
iMessage apps	Not listed	Not listed
Live app cards	Not listed	Not listed
Sender name and photo	PartialContact card sets a display name and avatar on the iMessage number; $250/month line only.	SupportedSet and verify the number's Name and Photo Sharing profile by API.
FaceTime calls	Not listed	PartialFaceTime Audio only, as a $250/month add-on per line.
Delivery status	PartialMessages carry a status and failure reason; no delivery or read webhooks are documented.	Supportedpending, sent, delivered, read and failed with a reason, by webhook or per-message callback.
iMessage availability check	SupportedLive check of iMessage, SMS and RCS reachability for a number before sending.	SupportedLive iMessage and FaceTime registration lookup; a separate lookup reads your own past traffic.
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportediMessage lines are ordered through the API and run by AgentPhone.	SupportedEach number runs on a Mac that Miss Blue operates; staff provision numbers within about 48 to 72 hours.
Dedicated numbers	SupportedUS and Canada numbers at $3/month; dedicated iMessage lines at $250/month.	Supported$99/month per number at the launch price (normally $198).
Shared numbers	Not listed	SupportedShared-pool numbers are offered as a separate, labelled option.
Bring your own number	Not listed	SupportedTransfer an existing number in; staff complete it in about 1 to 2 weeks.
Line pooling	Not listed	SupportedAuto round robin spreads new contacts across a project's dedicated numbers, then keeps each on one.
SMS fallback	SupportedFalls back to SMS/MMS when iMessage is not available.	SupportedFalls back to RCS, or to SMS where RCS is unavailable, from the same number.
RCS fallback	SupportediMessage-capable numbers deliver over RCS or SMS to non-Apple recipients.	SupportedFalls back to RCS where the carrier and recipient support it.
Outbound-first messaging	PartialOutbound iMessage lines: 50 new contacts a day per line; inbound-only lines do not start chats; SMS needs 10DLC.	SupportedNew contacts are paced: 50 per number per day by default and 150 messages a day in total.
Calls on the iMessage number	Not listed	SupportedFaceTime Audio and phone calls from the number customers already message.
Other channels
SMS	SupportedSMS and MMS; inbound works at once, outbound needs 10DLC.	SupportedAs fallback from the iMessage number; the docs also describe Twilio SMS lines.
RCS	BetaRCS Business Messaging is beta and concierge-onboarded: branded sender, quick-reply chips.	SupportedAs fallback when the carrier and recipient support it.
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 supportedNot offered as a channel; the Slack page is an integration guide.
Email	Not supported	Not supportedNot offered as a channel; 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.	PartialBrowser phone calls as a $75/month add-on; API keys cannot place regular phone calls.
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.	SupportediMessage with RCS and SMS fallback, groups and calls share one API and webhook stream.
Developer tools
REST API	Supported	Supported113 endpoints across 13 resources, with an OpenAPI file.
TypeScript SDK	Supportednpm install agentphone	Not listedThe API is plain HTTP; no SDK package was found.
Python SDK	Supportedpip install agentphone	Not listed
Other SDKs	Not listedDocs list only TypeScript and Python; an agentphone-go repo holds only a placeholder README.	Not listed
CLI	Not listedNo own CLI found; numbers can be provisioned through the Stripe Projects CLI.	Supportedmb, with installers for macOS, Linux and Windows.
Webhooks	SupportedProject default webhook with per-agent overrides.	Supported
Signed webhooks	SupportedHMAC-SHA256 over timestamp and body, with a timestamp header for replay protection.	SupportedHex HMAC-SHA256 over timestamp and raw body; per-message callbacks are unsigned.
MCP server	SupportedHosted MCP server (mcp.agentphone.ai) and npm package agentphone-mcp.	Supportedmb mcp serves the CLI commands as MCP tools for Claude Code, Codex, Cursor and others.
Open source	Not supportedClosed platform. The MCP server and framework integrations are MIT-licensed on GitHub.	Not supportedThe CLI repo holds builds and installers without a license; the service is closed.
Self-hosting	Not supportedHosted cloud service only	Not listed
Local testing	PartialBrowser web calls test a voice agent without a phone number; no message simulator found.	Supportedmb_sandbox_ keys simulate outcomes and signed webhooks on a virtual number, with no phone.
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.	PartialPer-endpoint delivery log and history sync; docs say to poll GET /v1/messages to repair missed events.
OpenTelemetry	Not listed	Not listed
No-code integrations	PartialAgentPhone block in Sim's no-code workflow builder; no Zapier, Make, n8n or GoHighLevel found.	BetaGoHighLevel connector is in beta; the Zapier, Make and n8n pages are setup guides.
CRM integrations	Not listed	BetaGoHighLevel connector in beta; HubSpot and Salesforce pages describe API builds set up in onboarding.
Built for AI agents
Agent framework	SupportedHosted voice mode runs calls from a system prompt; conversation state rides along in webhooks.	PartialNo agent SDK; offers a managed conversational AI add-on and multi-step automations.
Agent framework integrations	SupportedVercel Chat SDK adapter, LangChain, CrewAI and OpenAI Agents SDK tools, Google ADK guide.	PartialGuide pages for Vercel AI SDK, Chat SDK, LangChain and Claude Agent SDK; no adapter package found.
Streaming replies	PartialVoice only: NDJSON streamed webhook replies start speech on the first chunk.	Not listed
Agent group chats	PartialAgents can create and take part in iMessage groups; agent-to-agent groups are not described.	Not listed
Human handoff	PartialVoice only: cold transfer of a call to a transferNumber, by the AI or your webhook.	SupportedShared Message Center for human takeover, with internal notes and resolving.
Audit logs	Not listed	Not listed
Message history API	SupportedConversations with paginated messages and custom metadata; call transcripts.	SupportedThread history by API and a conversation sync from the line's Mac.
Plans and compliance
Free plan	Partial$5 starting credit, no card. Outbound calls need a top-up first.	SupportedFree sandbox with simulated sends, plus a 30-minute live demo line by texting DEMO.
Public pricing	Supported	Supported
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.	PartialEnterprise only: contracted service terms; no uptime figure published.
Isolated infrastructure	Not listedSub-accounts isolate agents, numbers and data per client; no dedicated infrastructure offer found.	SupportedDedicated numbers run on hardware assigned to you; Enterprise adds dedicated equipment.
SOC 2 Type II	PartialSOC 2 Type I report as of July 30, 2026; Type II examination in progress.	Not listed
GDPR	SupportedPrivacy policy sets out GDPR legal bases for processing.	Not listed

Feature

AgentPhone

Miss Blue

iMessage messaging

iMessage

iMessage lines are a separate number type (type=imessage).

Group chats

iMessage groups arrive as one conversation with roster and sender; reply to the group id.

Send into an existing group by its chat_id and read group threads.

Group management

PartialStart a new group by listing recipients and rename it; adding or removing members is not documented.

Create groups of 2 to 32 and add or remove members; leaving a group is not supported yet.

Group name and photo

PartialGroup name can be set by API; the group icon is only readable.

Rename a group and set or remove its photo.

Mentions

Not listed

Tapbacks

Six classic tapbacks, custom emoji on newer lines; inbound reactions via agent.reaction.

Add or remove the six tapbacks; tapbacks from customers appear on the message.

Threaded replies

reply_to_message_id; also on WhatsApp.

Quoted replies with reply_to_message_id.

Typing indicators

Send only, best-effort, auto-expires after a few seconds.

Send typing, optional auto-typing on inbound iMessage, and contact typing via webhook.

Read receipts

Not listedThe pricing page mentions read receipts; no API or webhook for them is documented.

Explicit read receipts by API; outbound messages report read.

Edit and unsend

Not listed

PartialUnsend within Apple's 2-minute window. An edit endpoint is documented, but the FAQ says editing is not supported yet.

Message effects

12 screen and bubble effects via send_style.

Not supportedThe errors page says effects are not a supported API operation yet.

Animated text effects

Not listed

Not supportedThe errors page says expressive text styles and effects are not supported yet.

Stickers

Not listed

Formatted text

Not listed

Attachments

Images, video and files by URL; several images arrive as a carousel on iMessage.

Images, video, PDFs, Office files and more up to 100 MiB, one per send, or carousels of 2 to 20 images.

Live Photos

Not listed

Rich link previews

Not listed

Voice messages

Not listed

Audio-only sends use the native voice-note bubble by default.

Contact cards

vCard files can be sent as media (listed as a supported MMS type).

Not listed

Polls

Not listed

Chat backgrounds

Set 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.

Send Find My requests, read the sharing state and watch live fixes over Server-Sent Events.

iMessage apps

Not listed

Live app cards

Not listed

Sender name and photo

PartialContact card sets a display name and avatar on the iMessage number; $250/month line only.

Set and verify the number's Name and Photo Sharing profile by API.

FaceTime calls

Not listed

PartialFaceTime Audio only, as a $250/month add-on per line.

Delivery status

PartialMessages carry a status and failure reason; no delivery or read webhooks are documented.

pending, sent, delivered, read and failed with a reason, by webhook or per-message callback.

iMessage availability check

Live check of iMessage, SMS and RCS reachability for a number before sending.

Live iMessage and FaceTime registration lookup; a separate lookup reads your own past traffic.

Focus and Notify Anyway

Not listed

Numbers and delivery

Managed lines

iMessage lines are ordered through the API and run by AgentPhone.

Each number runs on a Mac that Miss Blue operates; staff provision numbers within about 48 to 72 hours.

Dedicated numbers

US and Canada numbers at $3/month; dedicated iMessage lines at $250/month.

$99/month per number at the launch price (normally $198).

Shared numbers

Not listed

Shared-pool numbers are offered as a separate, labelled option.

Bring your own number

Not listed

Transfer an existing number in; staff complete it in about 1 to 2 weeks.

Line pooling

Not listed

Auto round robin spreads new contacts across a project's dedicated numbers, then keeps each on one.

SMS fallback

Falls back to SMS/MMS when iMessage is not available.

Falls back to RCS, or to SMS where RCS is unavailable, from the same number.

RCS fallback

iMessage-capable numbers deliver over RCS or SMS to non-Apple recipients.

Falls back to RCS where the carrier and recipient support it.

Outbound-first messaging

PartialOutbound iMessage lines: 50 new contacts a day per line; inbound-only lines do not start chats; SMS needs 10DLC.

New contacts are paced: 50 per number per day by default and 150 messages a day in total.

Calls on the iMessage number

Not listed

FaceTime Audio and phone calls from the number customers already message.

Other channels

SMS

SMS and MMS; inbound works at once, outbound needs 10DLC.

As fallback from the iMessage number; the docs also describe Twilio SMS lines.

RCS

BetaRCS Business Messaging is beta and concierge-onboarded: branded sender, quick-reply chips.

As fallback when the carrier and recipient support it.

BetaBeta, enabled per account. Connect your own WhatsApp Business Account; Meta bills you.

Not supportedNot offered

Not supported

Slack

Not supported

Not supportedNot offered as a channel; the Slack page is an integration guide.

Not supported

Not supportedNot offered as a channel; iMessage can be sent to Apple ID email addresses.

Phone calls

Inbound and outbound calls in webhook mode or hosted AI mode; also browser web calls.

PartialBrowser phone calls as a $75/month add-on; API keys cannot place regular phone calls.

Apple Messages for Business

Not supportedNot offered

Unified channel API

One send endpoint for SMS, MMS, iMessage, RCS and WhatsApp; one agent.message webhook incl. voice.

iMessage with RCS and SMS fallback, groups and calls share one API and webhook stream.

Developer tools

REST API

113 endpoints across 13 resources, with an OpenAPI file.

TypeScript SDK

npm install agentphone

Not listedThe API is plain HTTP; no SDK package was found.

Python SDK

pip install agentphone

Not listed

Other SDKs

Not listedDocs list only TypeScript and Python; an agentphone-go repo holds only a placeholder README.

Not listed

CLI

Not listedNo own CLI found; numbers can be provisioned through the Stripe Projects CLI.

mb, with installers for macOS, Linux and Windows.

Webhooks

Project default webhook with per-agent overrides.

Signed webhooks

HMAC-SHA256 over timestamp and body, with a timestamp header for replay protection.

Hex HMAC-SHA256 over timestamp and raw body; per-message callbacks are unsigned.

MCP server

Hosted MCP server (mcp.agentphone.ai) and npm package agentphone-mcp.

mb mcp serves the CLI commands as MCP tools for Claude Code, Codex, Cursor and others.

Open source

Not supportedClosed platform. The MCP server and framework integrations are MIT-licensed on GitHub.

Not supportedThe CLI repo holds builds and installers without a license; the service is closed.

Self-hosting

Not supportedHosted cloud service only

Not listed

Local testing

PartialBrowser web calls test a voice agent without a phone number; no message simulator found.

mb_sandbox_ keys simulate outcomes and signed webhooks on a virtual number, with no phone.

Custom channel providers

Not listed

Event replay

PartialFailed webhooks retry 5 times over about 20 hours; deliveries can be listed but not replayed.

PartialPer-endpoint delivery log and history sync; docs say to poll GET /v1/messages to repair missed events.

OpenTelemetry

Not listed

No-code integrations

PartialAgentPhone block in Sim's no-code workflow builder; no Zapier, Make, n8n or GoHighLevel found.

BetaGoHighLevel connector is in beta; the Zapier, Make and n8n pages are setup guides.

CRM integrations

Not listed

BetaGoHighLevel connector in beta; HubSpot and Salesforce pages describe API builds set up in onboarding.

Built for AI agents

Agent framework

Hosted voice mode runs calls from a system prompt; conversation state rides along in webhooks.

PartialNo agent SDK; offers a managed conversational AI add-on and multi-step automations.

Agent framework integrations

Vercel Chat SDK adapter, LangChain, CrewAI and OpenAI Agents SDK tools, Google ADK guide.

PartialGuide pages for Vercel AI SDK, Chat SDK, LangChain and Claude Agent SDK; no adapter package found.

Streaming replies

PartialVoice only: NDJSON streamed webhook replies start speech on the first chunk.

Not listed

Agent group chats

PartialAgents can create and take part in iMessage groups; agent-to-agent groups are not described.

Not listed

Human handoff

PartialVoice only: cold transfer of a call to a transferNumber, by the AI or your webhook.

Shared Message Center for human takeover, with internal notes and resolving.

Audit logs

Not listed

Message history API

Conversations with paginated messages and custom metadata; call transcripts.

Thread history by API and a conversation sync from the line's Mac.

Plans and compliance

Free plan

Partial$5 starting credit, no card. Outbound calls need a top-up first.

Free sandbox with simulated sends, plus a 30-minute live demo line by texting DEMO.

Public pricing

No per-message fees

PartialiMessage lines and WhatsApp have no per-message charge; SMS is $0.02 a segment, MMS $0.03.

Uptime SLA

Not supportedTerms promise no uptime; SLAs only if set in an order or separate agreement.

PartialEnterprise only: contracted service terms; no uptime figure published.

Isolated infrastructure

Not listedSub-accounts isolate agents, numbers and data per client; no dedicated infrastructure offer found.

Dedicated numbers run on hardware assigned to you; Enterprise adds dedicated equipment.

SOC 2 Type II

PartialSOC 2 Type I report as of July 30, 2026; Type II examination in progress.

Not listed

GDPR

Not listed

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

Pricing

AgentPhone

Pay as you go with $5 of starting credit: $3 per number a month, $0.13 to $0.22 a voice minute and $0.02 per SMS segment, with iMessage lines at $150 or $250 a month and no per-message charge.

Pricing model: usage-based, flat per line for iMessage

Source

Miss Blue

A free sandbox for testing, then $99 per dedicated number per month at the launch price (normally $198), with the usual $479 setup fee waived until October 31; FaceTime Audio ($250), phone calls ($75) or both ($300) are optional add-ons per line, and Enterprise is custom.

Pricing model: flat per line

Source