Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
Protocol is a minimalist fitness tracking app built around the idea of “Lift. Eat. Track. Repeat.” It covers workouts, nutrition, body weight, habits, and notes. With no social feed, it is aimed at users who want to focus on following their own training plans with fewer distractions. The app offers download links for both iOS and Android and includes 100+ prebuilt exercises, making it easy to start logging from your very first set.
For basic fitness tracking, Protocol supports workout logs, training templates, per-exercise analysis, nutrition logging, body weight and habit tracking. Its positioning is closer to a long-term “training protocol” journal than a community-driven fitness platform. On the AI side, its AI Coach uses a third-party large language model, currently OpenAI, to answer fitness-related questions. If “Include workout data” is enabled, the app will send a summary of recent workout data together with the user’s message to the AI provider, so responses can be tailored more closely to the user’s training context.
The main text clearly states that AI Coach requires an account and an active subscription, but it does not disclose specific pricing, free quotas, trial periods, or plan differences. On privacy, Protocol emphasizes that most data is stored locally on the device, which is an important advantage. However, when using AI Coach, user messages are sent to a third-party AI provider; if workout data inclusion is enabled, summaries of recent workouts are also sent to OpenAI. Users who are privacy-sensitive or do not want their fitness data processed outside their region should be cautious about enabling this feature.
The main strengths are its focused product design, comprehensive tracking dimensions, lack of social distractions, and the fact that training and nutrition are handled in the same app, avoiding the need for a second subscription or another browser tab. The limitations are that AI Coach output is only general educational information and cannot replace advice from a doctor, physical therapist, certified personal trainer, or registered dietitian. The terms also make clear that AI responses may be incomplete, inaccurate, outdated, or unsuitable for an individual’s situation. In addition, the main text does not clarify Chinese language support, API availability, data export, customer support SLA, refunds, or payment methods.
Protocol is suitable for strength trainees, disciplined fitness users, and anyone who wants a clean tool for consistently tracking workouts and nutrition. Access from mainland China is unknown. Since AI Coach currently uses OpenAI, its AI features may face uncertainty around network connectivity and compliance availability. If you need a Chinese-language ecosystem or localized payments, alternatives such as Keep and 薄荷健康 may be worth comparing; if your priority is strength training logs, Strong, Hevy, and FitNotes are also relevant options.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on protocol4.net official site.
protocol4.net is an United States AI Apps provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach protocol4.net directly.