Ai voice & text note-taking with LINE Messaging, Supabase Vector DB & Gmail

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Overview This workflow lets you capture, store, and retrieve notes from LINE chats — both text and voice messages — and automatically send them to your Gmail inbox. By leveraging Supabase Vector Da...

Best for

AI RAG automation workflows
Multimodal AI automation workflows
advanced n8n builders looking for reusable templates

Tools used

@n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.switch, n8n-nodes-base.set, n8n-nodes-base.if, n8n-nodes-base.httprequest, @n8n/n8n-nodes-langchain.openai, @n8n/n8n-nodes-langchain.embeddingsopenai

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by kote2.

Original n8n.io source

1.1 Workflow description

Title: Ai voice & text note-taking with LINE Messaging, Supabase Vector DB & Gmail
Workflow name: Ai voice & text note-taking with LINE Messaging, Supabase Vector DB & Gmail

Overview

This workflow lets you capture, store, and retrieve notes from LINE chats — both text and voice messages — and automatically send them to your Gmail inbox. By leveraging Supabase Vector Database, you can not only store and recall your notes, but also repurpose them for idea generation, quiz creation, or hypothesis building.

Key Features

Receive text and audio messages via LINE

Transcribe audio messages automatically and save them in Supabase

Trigger note storage with a specific keyword (default: “Diane”)

Automatically send the latest notes to your Gmail every morning at 7 AM

Search and reuse your notes (e.g., generate ideas, quizzes, or insights)

Requirements

Supabase account (free plan supported)

LINE Messaging API channel setup (obtain your access token)

Gmail authentication (OAuth2)

Notes

Replace placeholders such as LINE_CHANNELACCESS_TOKEN, YOUR_USERID, and YOUR_EMAIL_ADDRESS with your own information.

All credentials (OpenAI, Supabase, LINE, Gmail, etc.) must be configured securely in the Credentials section of n8n.

You may customize the trigger keyword (“Diane”) to any word you like.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 1.8

Block 2 - OpenAI Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 3 - Switch

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.2

Block 4 - Edit Fields

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 5 - If

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 6 - Download

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 7 - Transcribe

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.6

Block 8 - If1

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 9 - Embeddings OpenAI

Type / Role: @n8n/n8n-nodes-langchain.embeddingsOpenAi - embeddingsOpenAi
Config choices: Version 1.2

Block 10 - Default Data Loader

Type / Role: @n8n/n8n-nodes-langchain.documentDefaultDataLoader - documentDefaultDataLoader
Config choices: Version 1

Block 11 - Recursive Character Text Splitter

Type / Role: @n8n/n8n-nodes-langchain.textSplitterRecursiveCharacterTextSplitter - textSplitterRecursiveCharacterTextSplitter
Config choices: Version 1

Block 12 - Add to Supabase Table

Type / Role: @n8n/n8n-nodes-langchain.vectorStoreSupabase - vectorStoreSupabase
Config choices: Version 1

Block 13 - Postgres Chat Memory

Type / Role: @n8n/n8n-nodes-langchain.memoryPostgresChat - memoryPostgresChat
Config choices: Version 1.3

Block 14 - Supabase Vector Store

Type / Role: @n8n/n8n-nodes-langchain.vectorStoreSupabase - vectorStoreSupabase
Config choices: Version 1

Block 15 - Embeddings

Type / Role: @n8n/n8n-nodes-langchain.embeddingsOpenAi - embeddingsOpenAi
Config choices: Version 1.2

Block 16 - Edit Fields1

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 17 - Code

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 18 - Schedule Trigger

Type / Role: n8n-nodes-base.scheduleTrigger - scheduleTrigger
Config choices: Version 1.2

Block 19 - Edit Fields2

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 20 - AI Agent1

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 1.8

Block 21 - OpenAI Chat Model1

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 22 - Supabase Vector Store1

Type / Role: @n8n/n8n-nodes-langchain.vectorStoreSupabase - vectorStoreSupabase
Config choices: Version 1

Block 23 - Embeddings1

Type / Role: @n8n/n8n-nodes-langchain.embeddingsOpenAi - embeddingsOpenAi
Config choices: Version 1.2

Block 24 - Send a message in Gmail1

Type / Role: n8n-nodes-base.gmailTool - gmailTool
Config choices: Version 2.1

Showing the first 24 of 30 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Ai voice & text note-taking with LINE Messaging, Supabase Vector DB & Gmail
Complexity	advanced
Nodes	30
Categories	AI RAG, Multimodal AI
Author	kote2
Published	17 Aug 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/7508/7508.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source AI RAG workflows Multimodal AI workflows

Frequently asked questions

What does Ai voice & text note-taking with LINE Messaging, Supabase Vector DB & Gmail do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your AI RAG, Multimodal AI use case.

kote2

3 workflows

Nodes

@n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.switch n8n-nodes-base.set n8n-nodes-base.if n8n-nodes-base.httprequest @n8n/n8n-nodes-langchain.openai @n8n/n8n-nodes-langchain.embeddingsopenai

Complexity

advanced

Published 17 Aug 2025

Likes 0

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Install path: /data/workflows/7508/7508.json

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Ai voice & text note-taking with LINE Messaging, Supabase Vector DB & Gmail

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - AI Agent

Block 2 - OpenAI Chat Model

Block 3 - Switch

Block 4 - Edit Fields

Block 5 - If

Block 6 - Download

Block 7 - Transcribe

Block 8 - If1

Block 9 - Embeddings OpenAI

Block 10 - Default Data Loader

Block 11 - Recursive Character Text Splitter

Block 12 - Add to Supabase Table

Block 13 - Postgres Chat Memory

Block 14 - Supabase Vector Store

Block 15 - Embeddings

Block 16 - Edit Fields1

Block 17 - Code

Block 18 - Schedule Trigger

Block 19 - Edit Fields2

Block 20 - AI Agent1

Block 21 - OpenAI Chat Model1

Block 22 - Supabase Vector Store1

Block 23 - Embeddings1

Block 24 - Send a message in Gmail1

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions