CM.com vs Linq

CM.com supports 27 of the 77 features compared here, and Linq supports 63.

Feature comparison

Feature	CM.com	Linq
iMessage messaging
iMessage	Not supportedNo iMessage support	Supported
Group chats	Not supported	SupportedPro plan. Up to 31 recipients. No read or delivery receipts in groups.
Group management	Not supported	SupportedAdd and remove participants and leave a group, iMessage groups only, 3-member minimum.
Group name and photo	Not supported	SupportedSet display_name and group_chat_icon on group chats.
Mentions	Not supported	SupportedGroup chats only. Notifies iMessage recipients even in a muted chat.
Tapbacks	Not supported	SupportedSix classic tapbacks or any emoji, send and receive via reaction webhooks.
Threaded replies	Not supported	Supportedreply_to with optional part_index. iMessage only.
Typing indicators	Not supported	SupportedSend and receive, in direct and group chats. iMessage only.
Read receipts	Not supported	SupportedMark chats read and receive message.read. One-to-one chats only.
Edit and unsend	Not supported	PartialEdit text up to 5 times within 15 minutes. Delete does not unsend from the recipient's device.
Message effects	Not supported	Supported11 screen and 4 bubble effects.
Animated text effects	Not supported	Supportedtext_decorations animations: big, small, shake, nod, explode, ripple, bloom, jitter.
Stickers	Not supported	SupportedPeel emoji or images onto messages, send stickers, or place them inline in text.
Formatted text	Not supported	SupportedBold, italic, underline and strikethrough ranges, plus animated text. iMessage only.
Attachments	Not supported	SupportedUp to 10MB by URL, 100MB with pre-upload.
Live Photos	Not supported	Not listed
Rich link previews	Not supported	Supportedlink parts render as rich previews on iMessage and RCS.
Voice messages	Not supported	SupportedDedicated voice memo endpoint renders the native iMessage voice bubble.
Contact cards	Not supported	SupportedSend .vcf files as media parts.
Polls	Not supported	SupportedCreate, add options, vote and read tallies, with poll webhooks. Not as a chat's first message.
Chat backgrounds	Not supported	SupportedColor, animated or photo backgrounds, in direct and group chats.
Location sharing	Not supported	SupportedRequest, read and stop Find My shares. Live location is a $79/mo add-on on Pro.
iMessage apps	Not supported	SupportedPro plan. Cards from your own Messages extension, or Linq-hosted cards (Experiences).
Live app cards	Not supported	SupportedUpdate App Card replaces a delivered iMessage app or Experience card in place.
Sender name and photo	Not supported	SupportedContact card API sets name and photo, shared per chat via Name and Photo Sharing.
FaceTime calls	Not supported	Not supportedDocs say the API does not place or answer calls.
Delivery status	Not supported	Supportedsent, delivered, read and failed webhooks. Groups report sent only.
iMessage availability check	Not supported	Supportedcheck_imessage and check_rcs endpoints.
Focus and Notify Anyway	Not supported	Not listed
Numbers and delivery
Managed lines	Not supportedNo iMessage support	Supported
Dedicated numbers	SupportedRequest phone numbers by API or the Voice Management app; extra numbers via the Channels app	SupportedPaid lines are dedicated. Provisioned by Linq, no self-serve number API.
Shared numbers	Not listed	SupportedFree Hobby tier uses a Shared Line, inbound-first, 20 contacts.
Bring your own number	SupportedNumber porting requests by API	Not listed
Line pooling	Not listed	SupportedManaged load balancing (Pro): send without from and Linq picks and fails over lines.
SMS fallback	Not supportedNo iMessage support; WhatsApp and other OTT channels can fall back to SMS	Supported
RCS fallback	Not supportedNo iMessage support	SupportedOrder is iMessage, then RCS, then SMS.
Outbound-first messaging	SupportedBusiness-initiated SMS and template messages through the Business Messaging API	SupportedFree Hobby tier is inbound-first. Docs recommend inbound-first flows to avoid flagging.
Calls on the iMessage number	Not supportedNo iMessage support	PartialAPI forwards inbound calls on the line; outbound needs caller-ID masking via another provider.
Other channels
SMS	SupportedSMS worldwide, plus SMPP and XML connections	Supported
RCS	SupportedRCS text, media, suggestions, rich cards and carousels	Supported
WhatsApp	SupportedWhatsApp Business with templates, interactive, catalogue and payment messages	BetaSeparate WhatsApp API in beta. Access by request, no SLA.
Telegram	Supported	Not supportedNot offered
Slack	Not supportedNot offered	Not supported
Email	SupportedEmail Gateway API for transactional and marketing email, plus SMTP	Not supportedNot offered. iMessage can be sent to Apple ID email handles.
Phone calls	SupportedVoice API, SIP trunking and a Voice FlowBuilder for IVR and call transfer	PartialAPI does not place or answer calls; it forwards inbound calls. Calling lives in the Linq Blue app.
Apple Messages for Business	SupportedList and time pickers, forms, OAuth and Apple Pay payment messages	Not listedAI context page mentions it, but no product page or docs were found.
Unified channel API	SupportedOne Business Messaging API for SMS, RCS, WhatsApp, Viber, Apple, Messenger, Instagram, LINE, Telegram and push	PartialiMessage, RCS and SMS share one API. WhatsApp is a separate API with its own keys and SDKs.
Developer tools
REST API	SupportedJSON over HTTPS with a product token	Supported
TypeScript SDK	Supported@cmdotcom/text-sdk on npm	Supported@linqapp/sdk
Python SDK	Supportedcm-text-sdk-python	Supportedlinq-python
Other SDKs	SupportedPHP, Java and .NET text SDKs, a Go email SDK and a .NET voice SDK	SupportedOfficial Go SDK.
CLI	Not listed	Supported@linqapp/cli: signup, sending, and a local webhook listener.
Webhooks	SupportedInbound messages, status reports and channel events by webhook	Supported
Signed webhooks	PartialEmail webhooks are HMAC-SHA512 signed; messaging webhooks rely on IP allowlisting	SupportedHMAC-SHA256, Standard Webhooks format, with replay protection.
MCP server	Not listed	Supported@linqapp/sdk-mcp with docs search and code execution tools.
Open source	Not supportedClosed platform; SDKs are on GitHub	PartialSDKs, CLI and adapters are Apache-2.0 or MIT on GitHub. The messaging platform is closed.
Self-hosting	Not supportedHosted cloud service only	Not supportedLinq describes itself as fully managed, in contrast to self-hosted options.
Local testing	Not listed	Not listedThe CLI streams webhooks locally, but tests still use a real phone.
Custom channel providers	SupportedAgent Inbox Channel API adds your own channel; Router Custom service connects your own service	Not listed
Event replay	PartialInbound and status webhooks are retried with backoff for up to 7 days; no replay API found	PartialRetries for 30 minutes; after that, re-fetch chats or ask Linq for a manual replay.
OpenTelemetry	Not listed	PartialW3C trace IDs on every response and webhook for OTel backends. No export of Linq spans by default.
No-code integrations	Not listed	SupportedLinq Blue works as a GoHighLevel messaging provider. No n8n, Make or Zapier found for the API.
CRM integrations	SupportedSalesforce, HubSpot and Microsoft Dynamics integrations	SupportedVia Linq Blue: GoHighLevel, HubSpot and Salesforce.
Built for AI agents
Agent framework	SupportedHALO: no-code AI agents across voice and messaging, built and tuned by asking HALO	PartialNo own framework. Maintains a Vercel Chat SDK adapter and OpenClaw and Hermes plugins.
Agent framework integrations	Not listed	SupportedLinq-maintained Vercel Chat SDK adapter, plus OpenClaw and Hermes Agent plugins.
Streaming replies	Not listed	Not supportedDocs say the Chat SDK adapter buffers streams into one final message.
Agent group chats	Not listed	Not listed
Human handoff	SupportedHALO hands conversations to people in Agent Inbox with full context	Not listed
Audit logs	Not listed	SupportedDashboard Activity page plus account-change webhooks with actor and origin.
Message history API	SupportedConversational Router Conversation History API returns a session's messages and events	Supported
Plans and compliance
Free plan	PartialBusiness Messaging trial to test the API without onboarding; no permanent free tier	SupportedHobby: $0, up to 20 contacts, through the CLI.
Public pricing	PartialChannel subscriptions from $58 a month are listed; SMS rates per country are quoted	SupportedPro from $260/mo. Enterprise is custom.
No per-message fees	Not supportedSMS billed per message; OTT channels billed by active users, conversations or messages	Supported
Uptime SLA	SupportedPublished SLA: 99.99% for Business Messaging and Voice, 99.90% for HALO and Service Cloud	SupportedContractual SLAs on the Enterprise plan; marketing cites 99.95%
Isolated infrastructure	Not listed	SupportedDedicated lines across 4 data centers on paid plans; Hobby uses a shared line
SOC 2 Type II	Not listedTrust Center lists ISO 27001, 27017, 27018 and others; no SOC 2 report found	SupportedType I and Type II, reports for 2022, 2024, 2025 and 2026.
GDPR	SupportedDPA covers GDPR; CM.com says customer data stays in Europe	SupportedDPA covers GDPR and UK GDPR, with Standard Contractual Clauses.

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 CM.com if you need bring your own number, Telegram, email and Apple Messages for Business.

Choose Linq if you need iMessage, group chats, group management and group name and photo.

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