LoopMessage vs Sendblue

LoopMessage supports 53 of the 77 features compared here, and Sendblue supports 58.

Feature comparison

Feature	LoopMessage	Sendblue
iMessage messaging
iMessage	Supported	Supported
Group chats	SupportedSend and receive in iMessage groups; not available in the sandbox.	BetaGroup API is in beta on select plans. AI Agent plan can only reply in existing groups.
Group management	SupportedCreate groups (needs the Init conversations add-on) and add or remove members.	BetaAdd and remove participants in iMessage groups via the beta groups API.
Group name and photo	SupportedSet group name (32 characters max) and photo with PATCH.	SupportedRename groups and set group photos on supported lines.
Mentions	Not listed	Not listed
Tapbacks	SupportedSix tapbacks or any emoji; inbound reactions arrive as message_reaction webhooks.	PartialSend classic tapbacks or any emoji. No inbound reaction events documented.
Threaded replies	Supportedreply_to_id on send; inbound webhooks carry a thread object.	Supportedreply_to on V2 iMessage lines, in direct and group chats.
Typing indicators	SupportedUp to 60 seconds; fails if the chat had no two-way activity in the last 5 minutes.	SupportedSend and receive. iMessage 1:1 only, not in groups.
Read receipts	PartialYou can mark chats read; no read event is documented for your outbound messages.	PartialCan mark chats read (1:1). Outbound statuses stop at DELIVERED, with no read status.
Edit and unsend	SupportedEdit within 15 minutes, unsend within 2 minutes of sending.	Not supportedDocs say editing is not supported via API and delete does not unsend.
Message effects	Supported13 bubble and screen effects via the effect field.	Supported13 send_style values.
Animated text effects	SupportedMarkup for shake, nod, explode, ripple, bloom and jitter.	Not listed
Stickers	PartialInbound messages can have type sticker; sending stickers is not documented.	Not listed
Formatted text	SupportedBold, italic, underline, strikethrough and text sizes in iMessage.	Not listed
Attachments	SupportedUp to 10 public HTTPS file URLs per message.	SupportedUp to 100MB on iMessage, 5MB on SMS.
Live Photos	Not listed	Not listed
Rich link previews	SupportedLinks get rich previews by default; preview: false sends plain text.	PartialDocs say links expand only after the recipient saves your contact.
Voice messages	SupportedSend audio files as voice messages; inbound audio is transcribed.	SupportedSend .caf files to render as inline voice notes.
Contact cards	Supportedcontact_file adds a vCard to the message.	SupportedSend .vcf files via media_url.
Polls	Not listedA helpdesk article lists polls among features, but no poll API is documented.	Not listed
Chat backgrounds	Not listed	Not listed
Location sharing	PartialInbound messages can have type location; sending a location is not documented.	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	Not listedDocs suggest sending a vCard so recipients see your name and photo.	SupportedName and Photo Sharing profile per line, shared into direct iMessage chats.
FaceTime calls	Not supportedFaceTime API is in progress on the roadmap; today only an inbound FaceTime call webhook.	PartialOutbound FaceTime audio over WebRTC (Agora). Needs a purchased FaceTime line.
Delivery status	Supportedmessage_delivered and message_failed webhooks, plus a status lookup by ID.	SupportedStatus callbacks from REGISTERED through SENT or DELIVERED.
iMessage availability check	PartialThrough LoopLookup, a separate LoopMessage service.	SupportedLookup API checks a phone number or email for iMessage.
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportedDedicated senders run on hardware LoopMessage rents to you.	Supported
Dedicated numbers	SupportedPhone number option is +$15/mo per dedicated sender; email senders also offered.	Supported
Shared numbers	SupportedShared senders for AI assistant use from $20/mo; free sandbox for testing.	SupportedFree sandbox uses a shared number with verified contacts only.
Bring your own number	PartialYou can port a US number in; your own Apple IDs are not accepted.	PartialOnly by porting the number in, which adds 3 to 5 days.
Line pooling	SupportedSender pools balance new contacts across senders and match replies to the right one.	SupportedNumber pooling with sticky sending. Automatic line selection needs account enablement.
SMS fallback	SupportedPaid add-on, +$15/mo per dedicated sender; included on shared plans.	Supported
RCS fallback	SupportedSame add-on uses RCS instead of SMS when the device supports it.	SupportediMessage, then RCS, then SMS. RCS on V2 lines.
Outbound-first messaging	PartialInit conversations add-on (+$30/mo), warm-up and recent opt-in required; no cold messaging.	SupportedFull outbound on Enterprise or Blue Ocean; Free and AI Agent plans are inbound-first
Calls on the iMessage number	PartialInbound cell calls to the sender number are forwarded (add-on); no outbound calls.	SupportedDashboard calls and FaceTime from the texting number; API calls via your Twilio caller ID.
Other channels
SMS	SupportedSet channel to sms; needs the SMS/RCS add-on.	Supported
RCS	SupportedSet channel to rcs; needs the SMS/RCS add-on.	SupportedV2 lines.
WhatsApp	SupportedAdd-on, +$10/mo, on the same phone number and API.	Not supportedNot offered
Telegram	Not supportedPlanned on the roadmap, not available yet.	Not supported
Slack	Not listed	Not listed
Email	Not listed	Not supportedNot offered. iMessage can be sent to Apple ID email addresses.
Phone calls	PartialInbound cell calls are forwarded to a number you choose (add-on); no call API.	PartialNo native calling API. Dashboard calls, outbound via your Twilio caller ID, inbound forwarding.
Apple Messages for Business	Not supportedNot offered; the helpdesk contrasts LoopMessage with it.	Not supportedNot offered
Unified channel API	SupportediMessage, SMS, RCS and WhatsApp on one number and one API.	SupportedOne API for iMessage, RCS and SMS, the only channels offered.
Developer tools
REST API	Supported	Supported
TypeScript SDK	PartialNo own SDK; Twilio's SDKs work through the Twilio-compatible API.	Supportedsendblue on npm.
Python SDK	PartialNo own SDK; docs show Twilio's Python SDK pointed at the Twilio-compatible API.	Supportedsendblue on PyPI.
Other SDKs	PartialNo own SDKs; Twilio's SDKs work through the Twilio-compatible API.	PartialGo, Rust and Ruby packages, listed as community packages.
CLI	Not listed	Supported@sendblue/cli: signup, messaging, contacts and webhooks.
Webhooks	SupportedRetried up to 30 times over several hours.	Supported
Signed webhooks	PartialYou set an authorization header and verify it; no HMAC signature.	PartialSends your shared secret in an sb-signing-secret header. No HMAC signature.
MCP server	PartialDocumentation-only MCP server; no access to your account or messages.	Supportedsendblue-api-mcp via npx.
Open source	PartialOnly the n8n node is MIT on GitHub; the platform is closed.	PartialSDKs and CLI are MIT or Apache-2.0 on GitHub. The messaging platform is closed.
Self-hosting	Not listed	Not listedSold as a hosted service on Sendblue's Apple devices; self-hosting is not mentioned.
Local testing	Not listedThe sandbox needs a real iPhone or Mac to message it.	Not listed
Custom channel providers	Not listed	Not listed
Event replay	PartialWebhook history API to fetch past events; no replay call.	PartialNo replay. Docs say to repair gaps by listing messages updated since a timestamp.
OpenTelemetry	Not listed	Not listed
No-code integrations	Supportedn8n, Zapier, Pipedream, HighLevel and LeadConnector.	SupportedZapier, Make and GoHighLevel. Docs FAQ says n8n resources are coming soon.
CRM integrations	SupportedHighLevel CRM and LeadConnector; no HubSpot or Salesforce found.	SupportedGoHighLevel, HubSpot, Salesforce, Close and Monday.com.
Built for AI agents
Agent framework	Not listed	PartialNo own framework. Maintains a Vercel Chat SDK adapter.
Agent framework integrations	Not listed	SupportedSendblue-maintained Vercel Chat SDK adapter.
Streaming replies	Not listed	Not supportedDocs say message editing is not supported via the API.
Agent group chats	Not listed	BetaA line can add another of your own dedicated lines to a group, via the beta groups API.
Human handoff	PartialPeople can reply from Slack, email or the embedded inbox; no agent handoff controls.	SupportedShared team inboxes with assignment, and agents that escalate to a rep.
Audit logs	PartialMessage, webhook and API request history kept; no account audit log found.	PartialSecurity page says all API requests are logged. No customer-facing audit log documented.
Message history API	SupportedPaginated history per contact, filterable by date, direction and type.	Supported
Plans and compliance
Free plan	SupportedSandbox with 5 contacts; free shared plan for schools and non-profits.	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	SupportedUnlimited messages; plans cap unique active contacts per day.	Supported
Uptime SLA	Not supportedHelpdesk says LoopMessage does not provide SLAs or contracts.	Supported99.99% uptime SLA on the Enterprise plan
Isolated infrastructure	SupportedA dedicated sender's number and server are allocated to you alone.	SupportedA dedicated HIPAA instance for HIPAA customers
SOC 2 Type II	Not supportedHelpdesk says LoopMessage has not been through a SOC 2 audit.	SupportedSOC 2 Type II, report on request.
GDPR	SupportedHelpdesk says data is stored following GDPR.	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 LoopMessage if you need edit and unsend, animated text effects, stickers and formatted text.

Choose Sendblue if you need iMessage apps, live app cards, sender name and photo and FaceTime calls.

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