MessageBlue vs Zernio

MessageBlue supports 38 of the 77 features compared here, and Zernio supports 57.

Feature comparison

Feature	MessageBlue	Zernio
iMessage messaging
iMessage	Supported	Supported
Group chats	SupportedSend text, attachments and voice notes to groups; receive group messages.	SupportedGroups on ordered senders: reply, create, rename, photo, members. Not on the sandbox line.
Group management	PartialCreate groups of 2 to 31 by API; no add or remove participant endpoints.	SupportedStart a group from a sender and add or remove participants; applied asynchronously.
Group name and photo	Not listed	SupportedRename a group or change its photo, one change per call.
Mentions	Not listed	Not listed
Tapbacks	SupportedSend or remove emoji or tapbacks; inbound tapbacks arrive by webhook.	SupportedSix Apple tapbacks plus custom emoji (iOS 18+). Inbound reactions arrive by webhook.
Threaded replies	Not listed	SupportedreplyTo on sends; inbound messages carry the reply thread id.
Typing indicators	SupportedSend and stop, up to 20 seconds; no inbound typing webhook documented.	PartialSend only, 1:1 chats, about 15 seconds, after a recent two-way exchange.
Read receipts	SupportedSend read receipts; outbound messages report a read status.	PartialMark a chat read inside an active two-way chat. Webhook docs list message.read for other platforms only.
Edit and unsend	Not listed	SupportedEdit text within 15 minutes; unsend within 2 minutes removes the bubble for the recipient.
Message effects	Not listed	Supported13 screen and bubble effects, such as slam, invisibleInk, confetti and fireworks.
Animated text effects	Not listed	Not listed
Stickers	Not listed	PartialInbound stickers are typed as sticker. Sending stickers is not documented.
Formatted text	Not listed	SupportedInline *bold*, _italic_, __underline__ and ~strikethrough~ markup renders as rich text.
Attachments	SupportedAttachments by public URL.	SupportedUp to 10 per message, each a public https URL of at most 256 characters.
Live Photos	Not listed	Not listed
Rich link previews	Not listed	SupportedOn by default; linkPreview: false sends links as plain text.
Voice messages	SupportedTo individuals and groups.	SupportedvoiceNote: true on an audio file. Inbound voice messages come with a transcript.
Contact cards	Not listed	PartialcontactCard shares the sender's own card only.
Polls	Not listed	Not listed
Chat backgrounds	Not listed	Not listed
Location sharing	Not listed	PartialStatic location pins only. Inbound shared locations arrive without coordinates.
iMessage apps	Not listed	Not listed
Live app cards	Not listed	Not listed
Sender name and photo	Not listed	PartialSets the name and photo on the sender's contact card, which recipients see when they save it.
FaceTime calls	Not listedInbox video call button is marked coming soon; voice calls need the team to enable.	Not listedInbound FaceTime attempts show in the thread as call-typed messages. No calling documented.
Delivery status	Supportedsent, delivered, read, SMS_FALLBACK and failed via status webhook.	Supportedmessage.delivered and message.failed webhooks; sends deferred for pacing show as queued.
iMessage availability check	SupportedCheck a number, or a whole group's participants, before sending.	Not listed
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportedRequest a number and the team provisions it, typically in 3 to 5 business days.	SupportedZernio orders numbers on its delivery provider's Apple-registered infrastructure.
Dedicated numbers	Supported$100/mo per line on Startups & SMB.	SupportedUS or UK numbers, some active instantly; email-handle senders through the API.
Shared numbers	Not listed	SupportedFree shared sandbox line for testing: contact writes first, 5 contacts, 50 messages a day.
Bring your own number	SupportedPair your own Mac and its Apple ID number with the MessageBlue agent.	PartialiMessage cannot run on a number you own. A sender held with the provider can be registered.
Line pooling	SupportedAssigns the least-mapped number per contact and remaps contacts if a number is blocked.	Not listedOne sender per profile; docs suggest spreading contacts across senders by hand.
SMS fallback	SupportedStatus event reports SMS_FALLBACK; not available for group creation.	SupportedSMS or RCS from the same number when the contact is not on iMessage.
RCS fallback	Not listedMarketing pages say SMS or RCS fallback; docs only describe SMS.	SupportedSMS or RCS from the same number; the provider picks per contact.
Outbound-first messaging	SupportedStart chats with any iMessage-capable number; warns after 5 unanswered messages.	SupportedOne new chat per 15 minutes per sender, warm-up from 2 to 50 a day, no links in openers.
Calls on the iMessage number	Not listedInbox voice call button says to contact the team; number used is not stated.	PartialOrdered numbers include call forwarding. Placing calls from the iMessage number is not documented.
Other channels
SMS	PartialOnly as fallback; new chats need an iMessage-capable recipient.	Supported
RCS	Not listedMentioned only as a fallback on marketing pages.	Supported
WhatsApp	Not supportedNot offered	Supported
Telegram	Not supported	Supported
Slack	Not supported	Supported
Email	Not supported	Not supportedNot offered as a channel. iMessage senders can use an email handle.
Phone calls	Not listedInbox voice call button says to contact the team; call type and number not stated.	SupportedInbound and outbound PSTN calls, SIP trunks, browser softphone, recording and transcription.
Apple Messages for Business	Not supportedNot offered	Not supportedNot offered
Unified channel API	PartialOne API for iMessage and its SMS fallback only.	SupportedSame inbox send call and webhooks for iMessage, SMS, WhatsApp, Telegram, Slack and social DMs.
Developer tools
REST API	SupportedOpenAPI 3.1 spec published.	Supported
TypeScript SDK	Supportednpm messageblue (0.0.7), generated from the OpenAPI spec.	Supported@zernio/node
Python SDK	Not supportedDocs say only TypeScript is published today; other languages on request.	Supportedzernio-sdk
Other SDKs	Not supported	SupportedGo, Ruby, Java, PHP, .NET and Rust.
CLI	Not listedThe API page mentions a CLI, but none is documented.	SupportedZernio CLI, including iMessage inbox sends and reactions.
Webhooks	SupportedInbound and status URLs with retries and dead-lettering.	Supported
Signed webhooks	SupportedX-MB-Signature: HMAC-SHA256 over timestamp and raw body.	SupportedHMAC-SHA256 of the raw body in X-Zernio-Signature, keyed by your secret.
MCP server	PartialDocumentation-only MCP server at docs.messageblue.ai/_mcp/server.	SupportedHosted at mcp.zernio.com/mcp, with OAuth sign-in or an API key.
Open source	Not listed	PartialSDKs, CLI, n8n node and Chat SDK adapter are MIT or Apache-2.0. The platform is closed.
Self-hosting	SupportedEnterprise plan: your cloud (BYOC), VPC or on-prem	Not supportedHosted cloud service only
Local testing	PartialBrowser test bench runs the no-code agent without sending an iMessage.	Not listedThe free sandbox still needs your own phone or Apple ID.
Custom channel providers	Not listed	Not listed
Event replay	SupportedFailed and dead-lettered deliveries are kept and can be replayed.	Supported7 attempts over about 51 hours, then dead-letter; any past event can be redelivered.
OpenTelemetry	Not listed	Not listed
No-code integrations	SupportedZapier, plus a no-code agent builder.	Partialn8n, Make and Zapier guides cover posting; Make's API call module reaches any endpoint.
CRM integrations	SupportedAgent connects to Salesforce, HubSpot and others; HubSpot inbox sync is private beta.	SupportedHubSpot: inbox contacts and messages sync to HubSpot timelines.
Built for AI agents
Agent framework	SupportedNo-code agent with model choice, prompt, knowledge, tools, memory and multi-step tasks.	PartialWorkflow engine with AI and handoff nodes; the workflow docs do not list iMessage.
Agent framework integrations	Not listedSite says it works with LangChain and the Vercel AI SDK via webhooks; no official integration.	PartialVercel Chat SDK adapter (iMessage not listed) and an OpenClaw skill.
Streaming replies	Not listed	PartialChat SDK adapter streams by editing on Telegram only.
Agent group chats	Not listed	Not listed
Human handoff	SupportedTeam inbox for manual replies; pause the agent or block it per contact.	PartialDashboard inbox and workflow handoff nodes; no iMessage-specific handoff documented.
Audit logs	SupportedOn the Business and Enterprise plans	SupportedAppend-only log of team-management actions; Enterprise adds broader audit logs.
Message history API	SupportedConversation by phone number.	Supported
Plans and compliance
Free plan	Supported$0 when you bring your own number on your own Mac; every feature included.	SupportedFirst 2 connected accounts free; free iMessage sandbox (5 contacts, 50 messages a day).
Public pricing	SupportedFree and $100/mo listed; Business and Enterprise are contact sales.	Supported$200 per iMessage sender per month, plus the connected-account fee.
No per-message fees	SupportedFlat $100/mo per line.	PartialiMessage pages say no per-message fee; an outbound meter of $1 per 10,000 after 10,000 starts Oct 2026.
Uptime SLA	Supported99.9% SLA listed from the $100 plan; the API page says enterprise plans	Not listedSite states 99.97% uptime; no contractual SLA found.
Isolated infrastructure	SupportedEnterprise plan: single-tenant or self-hosted stack	Not listed
SOC 2 Type II	PartialEnterprise page claims audited SOC 2 Type II; pricing says SOC 2 ready; no report found.	SupportedSOC 2 Type II report in the trust portal, by access request.
GDPR	Not listed	SupportedGDPR documentation in the trust portal; public DPA.

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 MessageBlue if you need iMessage availability check, line pooling, self-hosting and local testing.

Choose Zernio if you need group name and photo, threaded replies, edit and unsend and message effects.

Frequently asked questions

• Photon vs MessageBlue
• MessageBlue vs Linq
• Blooio vs MessageBlue
• MessageBlue vs Sendblue
• LoopMessage vs MessageBlue
• Blue Reacher vs MessageBlue
• Chert vs MessageBlue
• MessageBlue vs Miss Blue
• Bland vs MessageBlue

• Photon vs Zernio
• Zernio vs Linq
• Blooio vs Zernio
• Sendblue vs Zernio
• LoopMessage vs Zernio
• Blue Reacher vs Zernio
• Chert vs Zernio
• Miss Blue vs Zernio
• Bland vs Zernio
• BlueBubbles vs Zernio