Get the guide on LINE, then continue to Cloud. The guide may be in Japanese.
Already added us on LINE? Open Cloud with Google →This English page introduces the open-source project and Cloud option. Screenshots, videos, community posts, and linked guides may be in Japanese. For current features and costs, see the official repository and Cloud offer and terms.
From drip campaigns to automated webinars,
loyalty points and affiliate programs — all in one place.
Manage your LINE Official Account with a full feature set, available as free, open-source software.
Put your budget to work beyond software subscriptions.
3 releases in October
LINE × X campaigns. Richer messages. Stronger integrations.
Explore the latest additions ↓
Our mission: free, open-source alternatives to SaaS —
an open-source project building infrastructure for the AI era together: The Harness.
LINE Harness is the first release.
X Harness and IG Harness are also available.
Get the guide on LINE, then continue to Cloud. The guide may be in Japanese.
Already added us on LINE? Open Cloud with Google →Follow the work: new campaign flows, richer messaging, and improvements to everyday operations.
Join without typing an X ID. Verify through LINE, receive a personal passphrase, then have the campaign post matched before receiving a reward.
Requires X Harness v0.7.0 and additional setup. Check the official release for installation requirements.
Official release notes ↗Incoming notifications are checked before processing. Missing or invalid signatures are rejected, strengthening payment and consultation integrations.
If you use Meet or Stripe, review the signing-key setup before updating.
Official release notes ↗Compose rich messages for broadcasts, scenarios, reminders, and individual chats. Combine up to five messages and arrange their delivery order.
Existing single-message content remains supported.
Official release notes ↗Fixes cover account-specific delivery, rich menus, reply tracking, bookings, and update screens. The release also adds a beta plugin marketplace.
For older installations, follow the update instructions in the official release.
Official release notes ↗Source: official GitHub Releases. Dates use Japan Standard Time. These are open-source releases; check the Cloud site for hosted-service availability.
LINE Harness is open-source software. Compare your required features, hosting, LINE messaging, and third-party service costs before choosing your setup.
Monthly subscriptions were the default for LINE management tools. Larger operations could face substantial recurring costs, while APIs stayed closed and data remained on the provider's servers.
AI and open source offer another approach: free software, API access through Claude Code, and control over your own code and data.
That is the idea behind LINE Harness.
For a long time, using SaaS meant paying ongoing subscription fees.
AI is opening up new ways to build and share the same kinds of tools.
We want more people to have the freedom to use and adapt those tools.
The LINE Harness software is free, permanently.
As open-source software, it puts you in control of your code and data.
An open-source alternative for managing LINE — with no license fee.
LINE Harness is a CRM platform with tools for managing LINE Official Accounts. It runs on Cloudflare Workers and uses the MIT license, which permits commercial use. Hosting and third-party service charges are separate; actual costs depend on usage.
Schedule automated messages. Build a nurturing sequence once and let it run around the clock.
Target contacts by tags, scores, and behavior with relevant messages.
Switch menus dynamically based on contact attributes.
Collect responses within LINE and tag contacts automatically.
Accept payments from LINE and trigger follow-up messages after a purchase.
Build conditional workflows using 7 trigger types and 6 action types.
Access features through the REST API and control them with Claude Code.
Monitor account health and trigger automatic failover when issues are detected.
Manage multiple LINE Official Accounts with cross-account UUIDs.
Run scheduled, prerecorded webinars with a waiting room, calls to action, and viewing analytics.
Award points for contact activity and build a rewards program across accounts.
Issue referral links, approve conversions, and manage commissions in your own affiliate program.
Sync availability with Google Calendar and generate Google Meet links automatically.
Webinars, loyalty points, and affiliate programs are part of the features added after the initial release.
Let affiliates create referral links, track the funnel from click to LINE friend to conversion, and manage approvals and commissions. Run your own affiliate program without a software license fee.
npx create-line-harness sets up the software with one command. Update from the dashboard while keeping your existing data.
AI analyzes incoming inquiries and automatically creates and sends personalized Flex Messages.
Booking confirmations, shipping notices, lesson reports, and seminar invitations can be delivered automatically.
This is just one example of what you can build with LINE Harness.
Examples of AI-generated Flex Messages (original Japanese screenshots)
LINE Harness is open source.
If you are new to open source, think of WordPress as a familiar example.
With traditional SaaS, the provider decides what to build and when. User requests can take a long time to become improvements.
By contrast, LINE Harness is a community-built project.
Users submit requests and reports as GitHub issues. Noda and community contributors use that feedback to improve the project.
As with WordPress plugins, you can add the features you need to suit your workflow.
Explore closed GitHub issues below to see community requests and development history (original language).
The original launch announcement recorded over 750,000 impressions. The posts below are the original Japanese announcements.
Original Japanese posts from the community.
All these features.No software license fee.
Get the guide on LINE, then continue to Cloud. The guide may be in Japanese.
Already added us on LINE? Open Cloud with Google →Get help putting generative AI to work in operations, sales, and marketing. Send “AI advisory” in a DM on X.
Ask about AI advisory on X ↗
Our mission: free, open-source alternatives to SaaS —
an open-source project building infrastructure for the AI era together: The Harness.
LINE Harness is the first release.
X Harness and IG Harness are also available.
Open source. API access. Your own environment.
You control your code and data.
Get the guide on LINE, then continue to Cloud. The guide may be in Japanese.
Already added us on LINE? Open Cloud with Google →P.S.
AI and open source are changing how software is built. Tools that once required recurring software subscriptions can now be shared freely.
LINE Harness is a community project. Users submit issues, contributors improve the code, and we build it together.
Free, open-source tools and shared infrastructure for a new era — that is the mission of The Harness. LINE Harness is the first release, followed by X Harness for X and IG Harness for Instagram. We look forward to building more with the community.
— Shuichi Noda
THE HARNESS, NOW IN THE CLOUD
No downloads. No server setup.
No terminal commands.
Spend less time on setup. The Harness Cloud starts with Google sign-in.
Check Cloud for available free slots
Get the guide on LINE, then continue to Cloud. The guide may be in Japanese.
Already added us on LINE? Open Cloud with Google →This offer concerns LINE Cloud hosting. LINE messaging and external AI service fees are separate. Availability is determined when you apply. See the official Cloud site for current support across services.
Current offer and terms: Official Cloud site (checked October 27, 2026) / Terms of service/Privacy policy
View counts are the publisher's September 21, 2026 snapshot. The Japanese videos show the service at the time of recording. Check the official Cloud site for current setup instructions and terms.