Development Gao, Peizhong and Liu, Fan and Wen, Di and Gao, Yuze and Zhang, Linxin and Wang, Chikelei and Zhang, Qiwei and Zhang, Yu and Ma, Shao-en and Lu, Qi and Mi, Haipeng and Xu, Yingqing Background: Olfactory interfaces are hampered by limited application scenarios in HCI. Purpose: Mul-O aims to expand research opportunities by enhancing context adaptation. System: Mul-O enables prototype creation with web UI, API, and wireless display hardware. Evaluation: Tested during a 15-day workshop with 30 participants and various projects. Result: Seven innovative projects validated Mul-O's effectiveness for olfactory innovation.