Tokyo solo developer Kenji Sakuramoto builds over ten apps from personal needs

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Kenji Sakuramoto runs ｋｅｎｓａｕｒｕｓ LLC, a studio founded in June 2025 in Shibuya, Tokyo, and maintains more than ten code repositories on his own. He says most of his apps began with problems in his own life, including lets-talk for practising difficult conversations, help her take photo for remote photo direction, and glot.it for learning Thai. Other projects include yen-yen, a shared household money book without bank links, and The Wanting Mind, a free book on why people want things. To keep AI agents consistent across his repositories, he wrote reusable playbooks and uses a separate read-only reviewer to decide whether a task is truly finished. He notes that the post was drafted with an AI assistant and fact-checked before publication.

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