Lanelines
A swim coach for the pool. It paces workouts from two timed swims, fits every set to your pool and runs a big poolside clock.
Screenshots
Screenshots supplied by the seller.
Description
Lanelines gives swimmers a fresh, properly structured workout every time. Choose how far you want to swim, your pool length and your focus: endurance, threshold, speed or technique. It builds a full session with a warm-up, drills, main sets and a cool-down, written out like a coach's whiteboard.
Your pace comes from two timed swims. A 400 m and a 200 m give your critical swim speed, a measure coaches widely use, and every set's target pace and send-off time follows from it. Send-offs land on neat five-second marks, so they're easy to follow on a pool clock, and all distances fit a 25 m or 50 m pool.
Press Start at the pool and your phone becomes a giant poolside display, showing the current swim, target pace, a large countdown and what's next. Finish a workout to log your distance and build your weekly streak.
It's plain JavaScript with no server or running costs, ready for a swim coach, club, triathlon group or leisure centre to brand as their own.
Condition
Development stage: Working prototype (seller-declared)
Seller-declared: provided by the seller, not independently verified by SellMyVibe.
- Solo creator
- Mainly AI-generated
- Under one month in development
- Mobile-friendly
- Tests included
- Setup guide included
- Demo available
What works
- Workouts from 1,000 to 4,000 m
- 25 m and 50 m pools
- Endurance, threshold, speed and technique focuses
- Critical swim speed from a 400 m and a 200 m
- Warm-up, drills, main sets and cool-down
- Send-off times on five-second marks
- Whiteboard-style workout view
- Large poolside view with a countdown
- Copy a workout as text
- Distance log and weekly streak
- 8 tests across 200 workout combinations, plus an automated browser run
What’s unfinished
- Freestyle-style pacing only, with no separate stroke paces
- Poolside mode counts down each send-off, but it can't sense when you finish a swim
- Yards pools and open water aren't supported
- No saved workouts, watch connection or accounts
- Drills are named but not explained
- English only, and a swim coach hasn't reviewed it or tried it at a pool
Included assets
Full source code
Test suite
Documentation
Technologies
HTML, CSS, JavaScript (ES modules), localStorage, Node test runner
Setup requirements
Upload the files to any static web host. To try it locally, run python3 -m http.server and open http://localhost:8000. Run the tests with npm test (Node 20 or newer).
Dependencies and ongoing costs
None. It's a static site that runs free on any web host.
Known limitations
Lanelines gives general training guidance, not medical advice, and it isn't a substitute for water safety or supervision. Users should swim within their ability and keep phones protected from water.
Listings are reviewed for completeness and clarity before publication. Approval is not a guarantee of quality, ownership, security or commercial success. Read the details and ask questions before buying.