Grammarly provides Android and IOS apps whereas ProWritingAid doesn't have a mobile or IOS app.
However, I found a contact email on their site. Six days later:
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AI 加持：全新推出 AI 搜索与 Copilot Agent 模式
组织未成年人从事第一款活动的，从重处罚。
Film type: Polaroid i-Type Color Film (sold separately) / Film size: 4.2 x 3.5-inch prints / Weight: 648 grams / Charging method: USB-C / Companion app: Yes / Other features: Flip-up lid, scene analysis feature