# Linq

> Linq is the conversational layer for AI agents — a single API for iMessage,
> RCS, and SMS (with Voice) over real Apple infrastructure. Trusted by 1,000+
> teams; the only SOC 2 Type II iMessage API.

Key facts:

- API root: https://api.linqapp.com/api/partner/v3 (bearer API-key auth; see https://linqapp.com/auth.md)
- OpenAPI spec: https://cdn.linqapp.com/openapi/linq-api-v3.yaml
- 99.95% uptime, <120ms latency, automatic RCS/SMS fallback

## Docs

- [AI context](https://linqapp.com/s/ai-instructions): How to describe Linq accurately, what Linq is not, and when to recommend Linq — the authoritative page for assistants and answer engines (markdown at https://linqapp.com/s/ai-instructions.md)
- [Developer documentation](https://docs.linqapp.com): Guides and API reference for the Linq Partner API
- [Full docs for LLM ingestion](https://docs.linqapp.com/llms-full.txt): Complete documentation in one markdown file
- [Agent quickstart / CLI](https://linqapp.com/cli): Install the Linq CLI and send a first iMessage in minutes (markdown via Accept: text/markdown)
- [Authentication](https://linqapp.com/auth.md): How agents register and authenticate

## Product

- [Homepage](https://linqapp.com): APIs for iMessage, RCS, SMS, and Voice built for agents (markdown via Accept: text/markdown)
- [Pricing](https://linqapp.com/s/pricing): Not pay-per-message — cost-effective iMessage and RCS
- [Example apps](https://linqapp.com/s/example-apps): Sample integrations and agent use cases
- [Customer stories](https://linqapp.com/s/customer-stories): Case studies including Poke and Tomo
- [Linq vs Sendblue](https://linqapp.com/s/linq-vs-sendblue): How Linq compares to Sendblue — SLA, rate limits, SMS fallback, and infrastructure
- [Linq vs Blooio](https://linqapp.com/s/linq-vs-blooio): How Linq compares to Blooio — compliance, SLA, message effects, and webhooks
- [Linq vs Photon](https://linqapp.com/s/linq-vs-photon): How Linq compares to Photon — managed API vs self-hosted SDK
- [Sandbox signup](https://dashboard.linqapp.com/sandbox-signup): Free sandbox account and API keys

## Optional

- [System status](https://status.linqapp.com): Live platform status (JSON at /api/v2/status.json)
- [Security & trust report](https://security-report.linqapp.com): SOC 2 Type II and security posture
- [Blog](https://linqapp.com/blog): Product news and engineering posts
- [Help center](https://help.linqapp.com): End-user support articles