Partner strength-training log
Train together.
Log it once
Log a set for your partner and it lands in both accounts. Swipe sideways to their page — workouts, food, weight, all of it. Then let the AI coach look at your form.
iOS 15+ ｜ Sign in with Apple / Google
Today · Chest + Triceps
Bench press
- 160 kg × 8 reps
- 260 kg × 8 reps
- 362.5 kg × 6 reps
Slow the descent a little more
7-day avg
68.2 kg▼ 0.4
Features
Train together, log once
Partner logging, AI form analysis, food and weight tracking — everything lifting needs.
One entry, both accounts
Once you and a partner authorize each other, a single entry writes to both accounts. Run the same program together without logging it twice.
Swipe to their page
Swipe sideways on the workout or weight tab to land on your partner's page and log for them directly. Works for coaches with clients and for couples — and they can still edit their own.
AI watches your form
Record a set. AI pulls 30 key frames, matches them to the exercise, and returns an A/B/C grade plus highlights and next-set tips. The video stays on your phone.
Three-tier workout structure
Weight, reps, rest, techniques (drop set / cluster), notes — all preserved in history. Use the preset list or add your own exercises.
Snap your meal, AI estimates
Photograph any food. AI estimates calories and the three macros. Recognizes Taiwan convenience store food too.
7-day moving average
Log daily and see the real 7-day trend line, past the noise of day-to-day water weight.
Post-workout store picks
After a session, AI suggests protein options from Taiwan 7-Eleven / FamilyMart based on what you just trained.
Friends activity feed
See friends' workouts, weight, and food. Like, comment, and import a friend's program with one tap.
FAQ
Frequently Asked Questions
How does the partner feature work?+
You and a partner authorize each other. After that, swiping sideways on the workout or weight tab takes you to their page, where you can add or edit entries for them. You can also check "log for both of us" so one entry lands in both accounts. They can still edit their own data, and either side can end the link at any time.
Is 捕手Spotter free?+
Core features (workout logging, partner logging, weight tracking, friends feed) are free. AI form coach, AI food recognition, and AI workout summaries have a daily free quota — upgrade to Spotter Pro for more.
Will my training videos be uploaded?+
No. Video stays on your phone. We only send 30 key-frame screenshots to AI for form analysis. The original video never leaves your device.
Is the AI analysis accurate?+
AI uses the exercise name you entered + key-frame screenshots and returns "highlights + improvements + next-set tip" in plain language. Accurate enough to catch common issues like lower-back rounding, not squatting deep enough, and torso leaning forward.
Can I only log exercises from the preset list?+
No. The preset list covers common lifts, but you can also type any name yourself (e.g. "DB lateral raise," "cable tricep pushdown"). AI matches your name and video content for feedback.
When is the Android version coming?+
Currently iOS only. Android is on the roadmap. Try the iOS version on the App Store first.
Do I need an Apple Watch?+
No. 捕手Spotter runs entirely on your iPhone. No watch or wearable needed.
Can I export my training data?+
Yes. In Settings, you'll find "Export workout history" and "Export weight log." Tap to open the share sheet — save to Files, AirDrop, or email. CSV format, opens in Excel / Google Sheets.
Find someone to train with. We'll handle the logging
Partner logging + an AI form coach + food & weight tracking, all in one app. 捕手Spotter is waiting on the App Store.
Download on the App Store