Contiguity vs Linq

Contiguity supports 37 of the 77 features compared here, and Linq supports 63.

Feature comparison

Feature	Contiguity	Linq
iMessage messaging
iMessage	SupportedOn leased iMessage-capable numbers; the FAQ says access is approved on request	Supported
Group chats	Not listed	SupportedPro plan. Up to 31 recipients. No read or delivery receipts in groups.
Group management	Not listed	SupportedAdd and remove participants and leave a group, iMessage groups only, 3-member minimum.
Group name and photo	Not listed	SupportedSet display_name and group_chat_icon on group chats.
Mentions	Not listed	SupportedGroup chats only. Notifies iMessage recipients even in a muted chat.
Tapbacks	PartialAdd or remove the six classic tapbacks; no inbound reaction event is documented	SupportedSix classic tapbacks or any emoji, send and receive via reaction webhooks.
Threaded replies	Not listed	Supportedreply_to with optional part_index. iMessage only.
Typing indicators	SupportedStart and stop typing indicators; inbound typing events are not documented	SupportedSend and receive, in direct and group chats. iMessage only.
Read receipts	PartialMark a chat as read; no read-receipt webhook is documented	SupportedMark chats read and receive message.read. One-to-one chats only.
Edit and unsend	Not listed	PartialEdit text up to 5 times within 15 minutes. Delete does not unsend from the recipient's device.
Message effects	Supported13 bubble and screen effects, such as slam, invisible ink, confetti and fireworks	Supported11 screen and 4 bubble effects.
Animated text effects	Not listed	Supportedtext_decorations animations: big, small, shake, nod, explode, ripple, bloom, jitter.
Stickers	Not listed	SupportedPeel emoji or images onto messages, send stickers, or place them inline in text.
Formatted text	SupportedBold, italics, strikethrough and underline with markdown-style syntax	SupportedBold, italic, underline and strikethrough ranges, plus animated text. iMessage only.
Attachments	SupportedUp to 10 files (50MB total) by URL; inbound attachments since February 2026	SupportedUp to 10MB by URL, 100MB with pre-upload.
Live Photos	Not listed	Not listed
Rich link previews	SupportedNative previews; until the recipient saves your contact they show after tap-to-load	Supportedlink parts render as rich previews on iMessage and RCS.
Voice messages	Not listed	SupportedDedicated voice memo endpoint renders the native iMessage voice bubble.
Contact cards	Supported.vcf contact cards send as attachments	SupportedSend .vcf files as media parts.
Polls	Not listed	SupportedCreate, add options, vote and read tallies, with poll webhooks. Not as a chat's first message.
Chat backgrounds	Not listed	SupportedColor, animated or photo backgrounds, in direct and group chats.
Location sharing	Not listed	SupportedRequest, read and stop Find My shares. Live location is a $79/mo add-on on Pro.
iMessage apps	Not listed	SupportedPro plan. Cards from your own Messages extension, or Linq-hosted cards (Experiences).
Live app cards	Not listed	SupportedUpdate App Card replaces a delivered iMessage app or Experience card in place.
Sender name and photo	Not listed	SupportedContact card API sets name and photo, shared per chat via Name and Photo Sharing.
FaceTime calls	PartialFaceTime Audio only: dial, answer, reject and hang up; $125 a month per number	Not supportedDocs say the API does not place or answer calls.
Delivery status	PartialFetch a message with tracking to see each hop; no iMessage delivery webhook	Supportedsent, delivered, read and failed webhooks. Groups report sent only.
iMessage availability check	SupportedCheck whether a number supports iMessage before sending	Supportedcheck_imessage and check_rcs endpoints.
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportedContiguity runs the leased iMessage numbers; no Mac needed	Supported
Dedicated numbers	SupportedLease a number from $9.99 a month, then add SMS, iMessage or FaceTime Audio	SupportedPaid lines are dedicated. Provisioned by Linq, no self-serve number API.
Shared numbers	SupportedFree and Usage plans send from shared numbers that vary per request, with no inbound	SupportedFree Hobby tier uses a Shared Line, inbound-first, 20 contacts.
Bring your own number	Not listed	Not listed
Line pooling	PartialOmitting from picks one of your numbers at random; you design the pool yourself	SupportedManaged load balancing (Pro): send without from and Linq picks and fails over lines.
SMS fallback	SupportedFalls back when the recipient has no iMessage or the send fails	Supported
RCS fallback	PartialFallback is described as SMS/RCS; RCS needs a number with both SMS and iMessage	SupportedOrder is iMessage, then RCS, then SMS.
Outbound-first messaging	SupportedAllowed; docs suggest at most 20 new contacts per line per hour and 100 a day	SupportedFree Hobby tier is inbound-first. Docs recommend inbound-first flows to avoid flagging.
Calls on the iMessage number	PartialFaceTime Audio and call forwarding on leased numbers; phone calling is coming soon	PartialAPI forwards inbound calls on the line; outbound needs caller-ID masking via another provider.
Other channels
SMS	SupportedSMS and MMS in 100+ countries; the compliance page says no A2P 10DLC registration is needed	Supported
RCS	PartialPricing lists RCS on leased numbers with both SMS and iMessage; no RCS API docs	Supported
WhatsApp	SupportedLeased WhatsApp numbers with SMS/RCS fallback, typing and reactions	BetaSeparate WhatsApp API in beta. Access by request, no SLA.
Telegram	Not supportedNot offered	Not supportedNot offered
Slack	Not supported	Not supported
Email	SupportedTransactional email with custom domains; inbound email is in beta	Not supportedNot offered. iMessage can be sent to Apple ID email handles.
Phone calls	PartialCall forwarding only; making and receiving calls is listed as coming soon	PartialAPI does not place or answer calls; it forwards inbound calls. Calling lives in the Linq Blue app.
Apple Messages for Business	Not supportedNot offered	Not listedAI context page mentions it, but no product page or docs were found.
Unified channel API	SupportedSame request shape for SMS, iMessage and WhatsApp, with shared history and cancel endpoints	PartialiMessage, RCS and SMS share one API. WhatsApp is a separate API with its own keys and SDKs.
Developer tools
REST API	Supported	Supported
TypeScript SDK	Supportedcontiguity on npm (v3)	Supported@linqapp/sdk
Python SDK	SupportedOfficial Python SDK; iMessage examples are marked coming soon	Supportedlinq-python
Other SDKs	Not listed	SupportedOfficial Go SDK.
CLI	PartialOfficial CLI repo, last updated February 2024 and not in the current docs	Supported@linqapp/cli: signup, sending, and a local webhook listener.
Webhooks	SupportedInbound SMS, MMS, iMessage and email, delivery, FaceTime and Identity events	Supported
Signed webhooks	SupportedHMAC-SHA256 Contiguity-Signature header with timestamp and rotatable secret	SupportedHMAC-SHA256, Standard Webhooks format, with replay protection.
MCP server	SupportedHosted MCP server with OAuth: send SMS, iMessage and email, read history, lease numbers	Supported@linqapp/sdk-mcp with docs search and code execution tools.
Open source	Not supportedClosed platform; SDKs and docs 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	Not listed	Not listed
Event replay	Not listedChangelog lists fetching webhook events by API as coming	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 listedAn ActivePieces integration exists but is labelled community-developed	SupportedLinq Blue works as a GoHighLevel messaging provider. No n8n, Make or Zapier found for the API.
CRM integrations	Not listed	SupportedVia Linq Blue: GoHighLevel, HubSpot and Salesforce.
Built for AI agents
Agent framework	Not listed	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	Not listed	Not listed
Audit logs	Not listed	SupportedDashboard Activity page plus account-change webhooks with actor and origin.
Message history API	SupportediMessage and SMS conversation history, plus fetch by message ID	Supported
Plans and compliance
Free plan	SupportedFree: 500 SMS, 100 MMS and 1,000 emails a month on shared numbers, with a signature	SupportedHobby: $0, up to 20 contacts, through the CLI.
Public pricing	Supported	SupportedPro from $260/mo. Enterprise is custom.
No per-message fees	SupportedLeased numbers and Unlimited are flat monthly; the Usage plan is $0.005 per SMS	Supported
Uptime SLA	Not listedDocs say Contiguity aims for over 99.99%; no contractual SLA found	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 listed	SupportedType I and Type II, reports for 2022, 2024, 2025 and 2026.
GDPR	Not listedPrivacy policy mentions GDPR in passing; no DPA found	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 Contiguity if you need FaceTime calls and email.

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

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