App 'Jikeyou' turns Apple Watch swim data into AI coaching and training plans

The app does not require extra hardware: users record a swim in the Apple Watch Workout app, then open Jikeyou on iPhone to review the session. Its main analysis page shows distance, time, average pace, stroke count, heart rate and calories, along with stroke cards. Behind those cards are professional metrics such as SWOLF — a score combining time and strokes per lap, where lower is better — as well as splits for every 25, 50 and 100 meters, an automatically grouped dashboard with a radar chart, comparisons between two swims, and heart-rate zone distribution.

The report says the split data helps answer a common question: a swimmer sees the final time but not how it happened. If the second half slows while stroke rate and heart rate climb, endurance or movement efficiency is likely the cause.

Jikeyou also lets users build or choose training plans and sync them to the Apple Watch. The plan library includes speed-oriented ladder intervals, beginner technique drills and longer endurance sets such as repeat 200m or 400m swims. The report gives an example: the author's current 1000m best is 31 minutes 19 seconds, or roughly 3:08 per 100m. To break 30 minutes, he would need to hold under 3:00 per 100m; he broke that into phases of 5×200m, 10×100m and a final 1000m test. This way, training and data feedback form a cycle: plan, execute, analyze, then adjust.

An AI explanation feature offers comments close to a professional coach, covering training performance, technical actions, race review, injury reminders and training advice. For the author, it said his freestyle catch quality was poor, forcing him to speed up stroke rate and drain energy quickly, and recommended improving pull and push technique. The report cautions that AI output is only a reference because factors such as lane blockage, breaks and pool length can distort a single session.

For long-term tracking, the app provides weekly, monthly and annual summaries, with monthly distance goals. Annual distance can be compared with famous open-water crossings such as the English Channel and the Strait of Gibraltar. Personal records are styled like Olympic rankings, but because Apple Watch measurements are not always accurate, the user must manually remove wrong entries.

Sharing tools include long screenshots and cards that combine core stats with a swim photo. A home-screen widget asks, 'Did you swim today?' and switches to 'Swam' after completion. There is also a simulated race mode that lets a user compete against past performances or famous swimmers, and users can generate challenges for friends.

Jikeyou is free to download in the App Store. A premium unlock for split details, personal records, annual review and AI features costs 38 yuan per year or 68 yuan for a lifetime purchase.