"Just Focusing on Instagram" Was Actually a Monthly Opportunity Loss of 40,000 Yen. SNS Efficiency App "Katteni" Undergoes Major Update to AI Post Generation Function
Sunshore Inc. has implemented a major update for its SNS efficiency app "Katteni." The AI's ability to learn user writing styles and automatically generate posts for multiple SNS platforms has been enhanced, aiming to reduce operational burden and expand reach.
📋 Article Processing Timeline
- 📰 Published: June 10, 2026 at 10:00
- 🔍 Collected: June 10, 2026 at 10:40 (40 min after Published)
- 🤖 AI Analyzed: June 12, 2026 at 16:52 (54h 11m after Collected)
"I know I should be doing TikTok and X too. But I'm already overwhelmed just managing one SNS platform."
Many people probably feel this way. The reason is simple: it takes about 2 hours to create one set of SNS posts (対応 for 6 platforms). If you post 3 times a week, that's 24 hours a month, 288 hours a year—12 days of work time disappears into SNS. That's why people give up and stick to just one platform because it's "too much trouble."
However, this choice comes at a cost. There is data showing that simply cross-posting the same content across multiple SNS platforms can expand reach by 30-40%. For businesses with a monthly revenue of 1 million yen, giving up on multi-platform deployment due to "trouble" means continuously losing 30,000 to 40,000 yen worth of reach opportunities each month.
*Source: Content Marketing Institute "Industry Report on the Reach Expansion Effect of Cross-Posting"
Sunshore Inc. (Yokohama, Kanagawa Prefecture, CEO: Yuri Katsumura) today announced a major update to "Katteni," an SNS efficiency app developed with the goal of breaking through this "2-hour barrier." The download rate immediately after its official release was 57.1% (approximately twice the industry average of 15-30%), underscoring the significant latent demand for addressing this challenge.
■ The Highlight This Time: Complete Posts for All SNS with the Touch of a Button
The core of this update is to eliminate the barrier to multi-platform SNS deployment.
However, "with the touch of a button" here does not mean simple automatic text generation. Katteni's AI analyzes the user's past posts, learns their writing style, tone, and linguistic habits, and then writes the posts. Posts that don't feel "AI-generated" and are true to the user's own style are generated simultaneously for Instagram, X, TikTok, Facebook, Threads, and LINE.
Furthermore, starting with this update, users can now choose from three generation styles.
"Style Priority" maximizes the reproduction of the account's writing style, preserving its worldview. "Improvement Priority" prioritizes maximizing engagement, leaning towards expressions that enhance reach and response rates. "Balanced" is in between, generating text that maintains the user's style while also considering performance metrics.
The AI automatically adjusts character limits, hashtag usage, and the tone differences of each platform, so all you need to do is provide the topic. Then, with the touch of a button, you'll have posts ready for all 6 platforms.
■ Analysis Also Upgraded
The AI now explains "Why it wrote that." After generation, the AI presents the reasons behind its chosen expressions. While automated, users can operate with a sense of performing PDCA cycles.
Account analysis is completed within the app. After linking SNS accounts, you can directly check follower trends, post performance, and engagement rates within the app. The cycle of posting, analyzing, and improving can be managed entirely within Katteni.
■ Three More Features Planned for Release in June
As a final step to automate the entire process of multi-platform SNS management, the following features are scheduled for release in June:
Report Generation Function: Export operational data to a spreadsheet with one click, eliminating manual copy-pasting at the end of the month.
AI Image and Video Editing Function: Simply upload your materials, and the AI will automatically edit them for posting. It will support adding subtitles, background music, and cut editing.
Management Dashboard for Corporations: Manage the posting performance of multiple accounts and members on a single screen, reducing management workload for SNS management agencies and marketing teams.
■ Created to Eliminate "580,000 Yen Worth of Work Annually"
CEO Yuri Katsumura, after working in sales, embarked on a solo trip around Japan on a moped. While visiting businesses across the country, he continuously gathered direct feedback from the front lines of SNS operations. The recurring sentiment he heard was, "I want to do it, but it's too hard to keep up."
Manual operation costs, calculated at an hourly wage of 2,000 yen, amount to 48,000 yen per month, or 580,000 yen per year. "Eliminate this 580,000 yen with Katteni's monthly fee of 3,980 yen"—this is the reason for the app's existence.
■ A Unique Combination in Japan
"Smartphone-based completion × Japanese AI × Monthly fee of 3,980 yen~"—this combination of three conditions is currently unavailable in any other SNS management tool, domestically or internationally. Competitors with similar features typically charge 10,000 to 15,000 yen or more per month.
■ Start for Free
You can start downloading and using the app for free from the App Store, Google Play, and web browser. Paid plans (Lite ¥3,980 / Pro ¥9,980) offer a 2-week free trial.
▼Download for Free
https://sunshore.jp/katteni
【Service Overview】
Service Name: Katteni
Service Format: iOS App (App Store), Android App (Google Play), PC (Browser version)
Pricing Plans: Basic download and usage are free (※Paid plans offering more advanced features are available starting from the industry's lowest price of ¥1,980/month).
Official Website: https://sunshore.jp/katteni
【Company Profile】
Company Name: Sunshore Inc.
Established: 2025
Representative Director: Yuri Katsumura
Business Description: Development and operation of the SNS automation app "Katteni."
Many people probably feel this way. The reason is simple: it takes about 2 hours to create one set of SNS posts (対応 for 6 platforms). If you post 3 times a week, that's 24 hours a month, 288 hours a year—12 days of work time disappears into SNS. That's why people give up and stick to just one platform because it's "too much trouble."
However, this choice comes at a cost. There is data showing that simply cross-posting the same content across multiple SNS platforms can expand reach by 30-40%. For businesses with a monthly revenue of 1 million yen, giving up on multi-platform deployment due to "trouble" means continuously losing 30,000 to 40,000 yen worth of reach opportunities each month.
*Source: Content Marketing Institute "Industry Report on the Reach Expansion Effect of Cross-Posting"
Sunshore Inc. (Yokohama, Kanagawa Prefecture, CEO: Yuri Katsumura) today announced a major update to "Katteni," an SNS efficiency app developed with the goal of breaking through this "2-hour barrier." The download rate immediately after its official release was 57.1% (approximately twice the industry average of 15-30%), underscoring the significant latent demand for addressing this challenge.
■ The Highlight This Time: Complete Posts for All SNS with the Touch of a Button
The core of this update is to eliminate the barrier to multi-platform SNS deployment.
However, "with the touch of a button" here does not mean simple automatic text generation. Katteni's AI analyzes the user's past posts, learns their writing style, tone, and linguistic habits, and then writes the posts. Posts that don't feel "AI-generated" and are true to the user's own style are generated simultaneously for Instagram, X, TikTok, Facebook, Threads, and LINE.
Furthermore, starting with this update, users can now choose from three generation styles.
"Style Priority" maximizes the reproduction of the account's writing style, preserving its worldview. "Improvement Priority" prioritizes maximizing engagement, leaning towards expressions that enhance reach and response rates. "Balanced" is in between, generating text that maintains the user's style while also considering performance metrics.
The AI automatically adjusts character limits, hashtag usage, and the tone differences of each platform, so all you need to do is provide the topic. Then, with the touch of a button, you'll have posts ready for all 6 platforms.
■ Analysis Also Upgraded
The AI now explains "Why it wrote that." After generation, the AI presents the reasons behind its chosen expressions. While automated, users can operate with a sense of performing PDCA cycles.
Account analysis is completed within the app. After linking SNS accounts, you can directly check follower trends, post performance, and engagement rates within the app. The cycle of posting, analyzing, and improving can be managed entirely within Katteni.
■ Three More Features Planned for Release in June
As a final step to automate the entire process of multi-platform SNS management, the following features are scheduled for release in June:
Report Generation Function: Export operational data to a spreadsheet with one click, eliminating manual copy-pasting at the end of the month.
AI Image and Video Editing Function: Simply upload your materials, and the AI will automatically edit them for posting. It will support adding subtitles, background music, and cut editing.
Management Dashboard for Corporations: Manage the posting performance of multiple accounts and members on a single screen, reducing management workload for SNS management agencies and marketing teams.
■ Created to Eliminate "580,000 Yen Worth of Work Annually"
CEO Yuri Katsumura, after working in sales, embarked on a solo trip around Japan on a moped. While visiting businesses across the country, he continuously gathered direct feedback from the front lines of SNS operations. The recurring sentiment he heard was, "I want to do it, but it's too hard to keep up."
Manual operation costs, calculated at an hourly wage of 2,000 yen, amount to 48,000 yen per month, or 580,000 yen per year. "Eliminate this 580,000 yen with Katteni's monthly fee of 3,980 yen"—this is the reason for the app's existence.
■ A Unique Combination in Japan
"Smartphone-based completion × Japanese AI × Monthly fee of 3,980 yen~"—this combination of three conditions is currently unavailable in any other SNS management tool, domestically or internationally. Competitors with similar features typically charge 10,000 to 15,000 yen or more per month.
■ Start for Free
You can start downloading and using the app for free from the App Store, Google Play, and web browser. Paid plans (Lite ¥3,980 / Pro ¥9,980) offer a 2-week free trial.
▼Download for Free
https://sunshore.jp/katteni
【Service Overview】
Service Name: Katteni
Service Format: iOS App (App Store), Android App (Google Play), PC (Browser version)
Pricing Plans: Basic download and usage are free (※Paid plans offering more advanced features are available starting from the industry's lowest price of ¥1,980/month).
Official Website: https://sunshore.jp/katteni
【Company Profile】
Company Name: Sunshore Inc.
Established: 2025
Representative Director: Yuri Katsumura
Business Description: Development and operation of the SNS automation app "Katteni."
FAQ
Which SNS platforms does "Katteni" support?
It supports a total of 6 platforms: Instagram, X (formerly Twitter), TikTok, Facebook, Threads, and LINE.
How can AI-generated posts be customized?
You can choose from three generation styles: "Style Priority," "Improvement Priority," and "Balanced." The AI also learns your writing style, generating posts that are true to you.
Are all features available on the free plan?
Basic download and usage are free, but more advanced features are available on paid plans. Paid plans offer a 2-week free trial.
What is the pricing for "Katteni"?
Paid plans start from ¥3,980 per month (Lite plan). The pricing is among the lowest in the industry compared to competitors.
What are the new analysis features added in the update?
Features include the AI explaining the reasons behind post generation and in-app account analysis to check follower trends and post performance.