# What you can connect to Line

> Line connects to Google Calendar, Microsoft Calendar, your own HTTP and MCP tools, and the SMS API. Email to SMS works with any software that sends email.

Source: https://useline.io/help/integrations/integrations-overview  
Section: Integrations and API  
Last updated: 2026-11-05

Line connects to four things: Google Calendar, Microsoft Calendar, your own HTTP and MCP tools, and the SMS API. You find them all in **Integrations** in the main menu.

## The integrations

| Integration | What it does | Plan |
|---|---|---|
| **Google Calendar** | Agents check free and busy times and book meetings in Google Calendar. A person approves each booking. | Pro and Business |
| **Microsoft Calendar** | The same, for Microsoft 365 and Outlook calendars. | Pro and Business |
| **HTTP and MCP tools** | Give agents tools that call your own HTTPS endpoints and MCP servers. | All plans |
| **SMS API** | Send and receive texts from your own software with Line API keys. Line must approve access first. | All plans |

Calendar connections count towards a plan limit. Starter has none, Pro has 3, and Business has no limit. See [Compare the plans](https://useline.io/help/billing/plans).

## Open Integrations

1. In the main menu, select **Integrations**.
2. Use the filters **All**, **Calendar** or **Developer**, or search by name.
3. Select an integration card to open its **Overview**.

Cards are in two groups: **Connected** and **Available**.

## Who can do what

| Action | Who |
|---|---|
| See the integrations | Every member |
| Connect, reconnect or disconnect a calendar | Owner or Admin |
| Add tools and secrets | Owner or Admin |
| See and set up the SMS API | Owner or Admin |

## Email to SMS

Email to SMS is not in **Integrations**. It is a channel. Any system that sends email can send a text through it, for example a CRM, a booking system or a monitoring tool. See [Send texts by email](https://useline.io/help/integrations/email-to-sms).

## What Line does not connect to

Line has no native Zapier, Make or n8n app. These tools can call the [SMS API](https://useline.io/help/integrations/sms-api) with an HTTP request, or send email to an Email to SMS gateway.

Line has no CRM, helpdesk or team chat connectors.

## Common problems

**I do not see the SMS API.** Only Owners and Admins see it.

**Connect is replaced by a lock.** Your plan has reached its calendar limit, or your plan does not include calendar connections. Change your plan, or disconnect a calendar that you do not use.

## Related articles

- [Get access to the SMS API](https://useline.io/help/integrations/sms-api.md): An Owner or Admin requests SMS API access in Integrations. After Line approves it, create test keys to try the sandbox and live keys to send real texts.
- [Send texts by email with an Email to SMS gateway](https://useline.io/help/integrations/email-to-sms.md): Create a gateway in Channels > Email to SMS. Email the gateway address with a mobile number in it, and Line texts the email body from your Line number.
- [Connect Google Calendar or Microsoft Calendar](https://useline.io/help/integrations/connect-a-calendar.md): Connect a calendar in Integrations so your agents can check free times and book meetings. A person approves each booking. Pro and Business only.
- [Compare the Starter, Pro and Business plans](https://useline.io/help/billing/plans.md): Line has three plans. Starter is a number and a team inbox. Pro adds recording, WhatsApp, templates and more agents. Business removes the limits.