Offline gear locker with automatic maintenance reminders, weight-managed trip planning, and zero data collection. Built for outdoor enthusiasts who maintain their own equipment.
Download Ferrule KestrelAll features included with base download. No in-app purchases. Data stored exclusively on your device with no external transmission.
Ferrule Kestrel runs entirely on your iPhone with no network connectivity. Every gear entry, maintenance log, and trip photo lives in local storage. The app never requests account creation, never pings external servers, and never uploads analytics. Your inventory remains physically isolated on hardware you control.
Service scheduling adapts to the state of each item. Mint-condition blades trigger reminders every 240 days. Solid gear drops to 150-day intervals. Worn equipment shortens to 60-day cycles. The waiting list automatically populates with overdue items ranked by days past due, eliminating manual calendar tracking.
Loadout planning centers on real-time weight calculations. Set pack limits in grams or ounces. Add items from your locker and watch the fill bar progress. Visual warnings trigger when approaching the ceiling. Over-limit packs display clear alerts with icon indicators. Historical data tracks total weight by category across your entire collection.
Catalog every knife, headlamp, cord, multitool with name, category, weight in grams, current condition, and freeform notes. Attach camera photos stored as local JPEGs. Star favorites and retire obsolete gear from active rotation.
Document sharpening sessions, cleaning procedures, lubrication applications, and inspection findings. Each entry timestamps the work, attaches to specific gear, and resets the countdown timer based on the item's current condition rating.
Circular progress ring visualizes collection health with mint-valid counts, blade totals, retired items, and service-due alerts. Weight distribution bar chart breaks down grams by category. Twelve-month outing activity graph shows trip frequency patterns.
Build trip loadouts by selecting items from your locker. Running weight total displays against user-defined gram limits. Visual fill bar progresses toward ceiling. Over-limit warnings appear with triangle icons and text labels when threshold exceeded.
Search inventory by name or custom tags. Filter display by six categories: Blade, Light, Cordage, Fire, Misc, Tool. Sort results by name alphabetically, weight ascending, or date added chronologically. Combine filters for precise queries.
Plan outings by environment type with terrain badges: Ridge, Forest, Desert, Snow. Assign dates and build terrain-appropriate packs. Historical trip list groups by year with total weight and item count for each excursion.
Ferrule Kestrel originated from field experience maintaining technical outdoor equipment in remote environments. The offline-first architecture emerged from situations where network access is unavailable for extended periods. Privacy isolation reflects a commitment to user data sovereignty—your gear list, service schedules, and trip plans should exist solely on devices you physically control. The weight-centric planning system addresses the practical reality that every gram matters when carrying loads over distance. Service interval automation prevents the common failure mode of neglecting blade sharpening or pivot lubrication until performance degrades noticeably.
iOS Utilities · Version 1.2 · Offline Operation · Zero Tracking
Download Ferrule KestrelRequires iOS. No account creation. All data stored locally on device. No network connectivity required for any functionality. Settings includes two-step data erasure for clean slate.