Subsc-Line Launches AI Personalize Delivery Option to Generate Customized Text, Image, and Video Messages for LINE Users

Subsc-Line Co., Ltd. (Headquarters: Shibuya-ku, Tokyo; Representative Director: Ryota Uno), developer and provider of the AI-driven LINE marketing CRM 'Subsc-Line', has launched 'AI Personalize Delivery' as a new option for its segment messaging feature. This feature narrows down the recipient list, utilizes AI to generate personalized text, images, and videos for each individual, and allows staff to review and approve the content before it is dispatched.

Traditional LINE messaging often delivered uniform content to all users within a targeted segment. 'AI Personalize Delivery' optimizes content on an individual level, meaning that messages and images change for each recipient even under the same campaign settings. AI handles the creative production instead of manual human processes.

Development Background: Shifting from 'Who to send to' to 'What to send'

In LINE official account management, segment messaging based on user groups and labels is widely utilized. However, the copy and images used after segmenting often remained uniform because creating personalized variations based on past behavior and preferences for a large number of users required significant production effort.
For example, when wishing birthday customers a happy birthday, it was common to send the same birthday image and template text to everyone at once. Even though businesses knew personalization yields better engagement, the operational workload was a bottleneck. 'AI Personalize Delivery' addresses this final hurdle through generative AI.

Three Core Features of 'AI Personalize Delivery'

1. Custom Visual Generation Based on LINE Profile Pictures
The main feature is the ability to generate unique visuals matching the recipient's style by referencing their LINE profile image. Even for the same campaign, different visuals and copy are created based on the user's profile picture, age, gender, and preferred attributes.

2. 1-to-1 Copywriting Driven by Name, Attributes, and Labels
The AI references the user's name, gender, age, friend registration date, and labels indicating purchasing, visiting, or interest history (e.g., 'purchased shortcake', 'morning visit', 'VIP', or 'hair color regular'). The system generates personalized text, one image per person, and a vertical video of approximately 4 seconds per person. Video generation can leverage technologies like OpenAI's Sora 2.

3. Staff Review, Editing, and Approval Before Dispatch
All generated content is listed on a review dashboard. Staff members check the text, image, and video for each recipient, edit them if necessary, and approve them. Only approved messages are sent at the scheduled delivery time, ensuring human supervision rather than fully automated AI dispatch. Bulk approval is also supported.

Designed for AI Delegation and Human Responsibility
To prevent misdelivery or inappropriate expressions, the system incorporates the following safety guidelines:
- AI drafts, humans send: All messages must be checked, edited, and approved by staff on the review screen. Only approved drafts are sent.
- Systematic review time: For recurring deliveries, content is generated 24 hours in advance. To secure review time, highly frequent (minutely or hourly) deliveries are excluded.
- Volume control: One run is capped at a maximum of 200 users, operating within the AI monthly usage limits of each plan.

Recurring Delivery Support: Re-generation for Changing Targets
Daily, weekly, and monthly recurring deliveries are supported. Content is generated 24 hours prior to each dispatch based on the current target audience list, allowing the system to automatically generate relevant materials even for changing audiences, such as 'customers celebrating their birthday this month'.

Use Case Example: Cake Shop Birthday Campaign
Previously, a cake shop segmenting by purchase history, birthday month, and taste preferences would send the same coupon to all birthday customers. With 'AI Personalize Delivery', the shop can execute personalized campaigns:
- Customers who purchased a shortcake last year will receive a message and an image evoking shortcakes one week before their birthday.
- Customers who frequently choose chocolate cake will receive a message tailored to chocolate cake.