01
Prepare
Chalk up, set your fingers and take position. Preparation is shown separately and is not counted as training.
Train by feel.
Climb with intent.
A climbing training companion that keeps the interval and recovery on your wrist, and the deep training context on your phone.
Join the TestFlight beta
For iPhone and Apple Watch · beta
First beta · back up important data regularly
01Hangboard & Intervals
02Bouldering & Boards
03Tendon Hub & Plans
One session.
Three clear states.
Rung separates preparation from work, makes every transition explicit and keeps the next grip visible before you need it.
The screen shows the state.
The wrist carries the transition.
- Input
- Timer transition
- Output
- Visual state + wrist cue
- Role
- Stay oriented without studying the screen
02
Hang
The active interval takes over the wrist. Large time, current grip and set count stay legible at a glance.
READY10SEC
Illustrative 7/3 repeater · 3 reps
Demo ready.
03
Rest
Recover without guessing. The next grip appears during the transition, before the following interval begins.
BOULDERING & BOARDS
From the board to the crag.
Track every burn.
Built for chalked hands: oversized outcome buttons, grade scrubbing on the Digital Crown, and peak heart rate recorded for every burn.
SESSION LOG
Attempt Logging
Log each burn as flash, send, zone or fall with oversized buttons. The rest clock starts on its own and records your peak heart rate, so recovery between attempts is on the screen.
- Outcomes
- Flash · Send · Zone · Fall
- Recovery
- Rest clock + peak heart rate
- Dial
- Crown scrubber: V-Scale / Font
STANDARDIZED BOARDS
System Training Boards
Native setups for MoonBoard (2016 Masters, 2019, 2024, Mini), Kilter Board, Tension Board 2, Grasshopper and Decoy — plus custom spray walls and system boards with hold tagging.
- MoonBoard
- 2016 Masters / 2019 / 2024 / Mini
- Kilter Board
- 20° to 70° in 5° steps
- Tension & Spray
- Tension 2, spray walls, hold tagging
GRADE SYSTEMS
Grades & Gym Colours
V-Scale and Fontainebleau with automatic conversion between them. Map your gym's hold colours to grades once, then log a session in the colours that are on the wall.
V-Scale V0–V17 · Font 3–9A · per-gym colour map
BENCHMARKS & RPE
Led testing protocols.
Honest load adaptation.
Standardized sports-science testing protocols with mandatory warm-ups, automatic PR calculation, and refusable RPE load proposals.
PROTOCOLS & PR
Standardized Testing
Max Hang (peak added load, 7 s on 20 mm), Min Edge (smallest edge held 10 s at bodyweight), and Repeaters Capacity. Conducted as led protocols with a standardized warm-up; results without warm-up are never accepted as baselines or PRs.
- Max Hang
- 7 s max added load on 20 mm
- Min Edge
- 10 s minimum edge at bodyweight
- Metrics
- Auto % BW strength-to-weight ratio
LOAD ADAPTATION
RPE Autoregulation
After a rated session, Rung proposes a load adjustment (≤6 add load, 7–8 hold, ≥9 back off). Always explicit, never applied automatically. If finger tenderness is flagged, load increases are strictly suppressed.
- RPE ≤ 6
- +2 kg load proposal, on confirmation
- RPE 7–8
- Hold parameters · target stimulus
- Protection
- Increases blocked during finger tenderness
TRAINING PLANS
Periodized blocks.
A schedule that slides.
Five structured blocks mapped onto your chosen training weekdays. Missed a session? It slides forward instead of vanishing or piling onto the next day.
0101 Strength Block · 8 weeks · heavy hangs around one deload, closing on a Max Hang benchmarkStrength
0202 Endurance Block · 7 weeks · 7/3 repeaters, power endurance and density hangsEndurance
0303 Forearm Capacity · 8 weeks · one steady intermittent-hang stimulus with aerobic forearm work (López-Rivera & González-Badillo 2019)Capacity
0404 Off-Season Maintenance · repeating weeks · the smallest dose that holds a block's gains, plus antagonist workMaintenance
0505 Return After a Finger Injury · 8 weeks · graded return-to-load, every loaded session locked behind its rehab phaseRehab
TENDON HEALTH
A check‑in before a conclusion.
In the morning you log finger stiffness, press each pulley structure and review cumulative load. A tender A2 or A4 pulley locks out heavy hangs on its own, whatever the stiffness score says. Rung shows the context and suggests a careful next step; it does not diagnose and does not replace a doctor.
- Input
- Stiffness, A2/A4 pulley tenderness and yesterday’s RPE
- Output
- Explainable training guidance
- Limit
- Not a medical diagnosis
Interactive Tendon Readiness Simulator
Pulley palpation tenderness
🟢 READY TO HANG
Normal tendon elasticity. Full training intensity permitted across crimp and pinch grip families.
EVIDENCE
Sources visible.
Limits included.
The in-app library pairs 38 peer-reviewed sports medicine and physiology studies with practical climber guides. Every source keeps its studied population, its relevance and its uncertainty instead of a cheap “science-backed” badge. This is one of the 38 entries:
Shaw, G., Lee-Barthel, A., Ross, M. L., Wang, B., Baar, K. (2017)
Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis
American Journal of Clinical Nutrition, 105(1), 136–143
- Evidence level
- Randomised trial
- Population
- 8 healthy male subjects, crossover, blood markers
- Finding
- 15 g of gelatine with vitamin C an hour before loading roughly doubled P1NP, a blood marker of collagen synthesis.
- Does not establish
- That any specific tendon got stronger, or that injury risk fell. What was measured is a marker in blood — not tissue, and not an outcome.
- Full text
- doi.org/10.3945/ajcn.116.138594
ARCHITECTURE & PRIVACY
Native craft.
Zero surveillance.
Built with modern SwiftUI and Swift Concurrency for iOS 18 and watchOS 11. Designed to run offline at the crag, with complete privacy.
WATCH ENGINE
Standalone Apple Watch
Standalone Apple Watch app with independent haptic cues, Digital Crown scrubbing, and HKWorkoutSession integration.
WIDGETS & LOCK SCREEN
Tendon Hub Glance
Live Activities & Home Screen Tendon Hub widgets with real-time readiness status and quick routine launchers.
OFFLINE & ICLOUD
Private Storage
100% Offline-First. No account required, no telemetry, no analytics. Syncs privately via your personal iCloud KVS.
Your next session can start here.
Rung is currently available as a TestFlight beta for iPhone and Apple Watch.
- Requirements
- iOS 18 · watchOS 11
- Account
- Not required
- Data
- Stays on your device and in your iCloud
First beta version Rung is still in development. The app may contain errors, behave unexpectedly or lose stored data. Back up important training data regularly and do not use this beta as your only record of training or health information.