Umbra Sphere vs GeoFog

Umbra Sphere is a proof-of-concept app, we use a geospatial technology called "S²Geometry" to store the locations you've visited, identify which country or region they belong to and present them on a map as cleared shadows (umbra). S²Geometry is a geocoding system that divides the Earth's surface into "cells" ranging from 85 million square kilometers to 0.5 square centimeters. These cells are converted into 64-bit integers using the Hilbert curve. Compared with traditional latitude-longitude coordinate system and map projections, S²Geometry is less intuitive, but it avoids significant distortion, delivers globally consistent accuracy, and offers extraordinary indexing and querying performance. With these advantages, Umbra Sphere converts traces into a series integers and stores them in database with appropriate indexes to generate umbra fast in real-time for displaying. It also provides statistical features, presenting the areas of countries or regions you've visited on "visa" cards. Additionally, Umbra Sphere also features a simple S²Geometry visualization tool, allowing you to view S²Geometry cells and their corresponding integer IDs directly on the map. ● Umbra Sphere supports importing these file types: • GPX and KML trace files • Sync files and snapshot files from Fog of World • Backup CSV files from StepLife ● Privacy We respect privacy, and simply do not collect any of your data. All your data are stored in your device. Umbra Sphere does not provide sync feature, you can manually export and import your data.

GeoFog turns everyday walks into visible progress on your map. EXPLORE Reveal streets from the fog as you walk. Record journeys, see your explored area, and revisit your progress. Explore mode keeps your route history and fog on your device. FRONTIERS Sign in to capture territory by walking closed loops. Territory can change hands when a later capture covers it. The mode includes simulated competitors. Nearby rankings reflect the visible arena; country and global rankings are simulated benchmarks. START AT YOUR OWN PACE A guided introduction helps you choose a manageable first walk and watch an illustrated map demo. You decide when to start and stop recording. Steps are measured when Motion access is available; otherwise the app labels them as estimates. PREMIUM ACCESS App features require an active subscription or eligible free trial. Completing onboarding, signing in, dismissing an offer, or restoring without an active purchase does not unlock the app. Registration is optional for Explore. Restore Purchases, account access, and legal information remain available before subscribing. Frontiers requires an account and internet connection. YOUR DATA AND CHOICES Explore route history stays on your device. Frontiers sends location and capture information, including submitted routes and aggregate steps, to its server to validate claims and maintain territory and rankings. Account, subscription, and optional product analytics services process the data described in the Privacy Policy. Coordinates and routes are excluded from product analytics. SUBSCRIPTIONS Weekly, monthly and annual plans, localized prices, billing periods and eligible introductory offers are shown before purchase. Payment is charged to your Apple Account when the purchase is confirmed or after the eligible trial. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel subscriptions through Apple Account settings. Privacy Policy: https://geofog-47e66.web.app/privacy.html Terms of Use: https://geofog-47e66.web.app/terms.html EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/