Helm Link vs Unruh

Helm Link is a walkie-talkie style voice chat app that works entirely over your local WiFi network. Perfect for boats, camping, events, or anywhere you need reliable local voice communication between crew. It supports full-duplex audio and works well with your existing headphones or earbuds.

Is your mechanical watch running fast or slow? Unruh tells you exactly — down to the fraction of a second. Unruh measures the accuracy of your mechanical watches by comparing them against atomic reference time (NTP). Simply tap when your second hand hits 12, and Unruh instantly calculates how far off your watch is. PRECISION MEASUREMENT • Atomic time reference via NTP synchronization • Offset measurement accurate to fractions of a second • Rate calculation in seconds per day (s/day) • Minute correction for fine-tuning results WATCH COLLECTION • Manage your entire watch collection in one place • Add photos, brand, model, movement & serial number • Track each watch's accuracy individually • Set and compare against accuracy standards INDUSTRY STANDARDS • COSC Chronometer (-4/+6 s/day) • METAS Master Chronometer (0/+5 s/day) • Rolex Superlative (-2/+2 s/day) • General Mechanical (-20/+40 s/day) • See at a glance if your watch meets certification standards ANALYTICS & TRENDS • Offset deviation charts over time • Daily rate trend visualization • 7 and 30 day views included for every watch • Summary statistics with averages, min & max values UNRUH PRO — ONE-TIME PURCHASE, NO SUBSCRIPTION • Unlimited watches (free version: up to 3) • Position tracking: log how each watch rested — dial up, dial down, crown left, crown up, crown down, or on the wrist • Best resting position analysis: find the position that compensates your watch's rate • Full history: 90 day and all-time charts • CSV export for your records • Pay once, keep it forever — and all future Pro features are included DIAGNOSTICS • Timegrapher (Beta): live beat rate and seconds/day via the microphone — free • Magnetism check using the built-in magnetometer — free BUILT FOR WATCH ENTHUSIASTS • Elegant dark mode design with gold accents • Haptic feedback for precise measurements • Daily measurement reminders • Available in English, German, Japanese, French, Italian and Spanish Whether you're a seasoned collector or just curious about your first automatic — Unruh is the precision tool your watches deserve.