Hoshizora ISS Alert
A Japan-specific ISS and bright-satellite alert app that sends a push notification 30 minutes before the station passes overhead, with AR sky-viewing to identify it among the stars.
Japanese casual skywatchers and families wanting to spot the ISS together
- Personalised pass alerts based on user's location across Japan, accounting for cloud cover forecasts
- AR sky-mapper that overlays the ISS path against the actual night sky using the phone camera
- 'First star' training mode that teaches beginners how to tell the ISS from planes and Venus
- Family-event mode that sets a reminder for kid-friendly evening passes
The SmartNews article confirms a high-visibility pass over Japan on July 24-25, 2026, with clear skies over Tokai and western Japan — exactly when casual observers try and fail to find it.
Japan-specific ISS interest is real: official JAXA-affiliated #きぼうを見よう service exists, Google Trends shows 200+ 'iss' searches in JP, and NASA's Spot The Station app shows global demand for ISS alerts.Spot The Station - NASA ↗#きぼうを見よう - 国際宇宙ステーションが見える予測日時をお知らせ ↗
Very crowded: NASA's official Spot The Station already bundles location-based push alerts AND AR sky-viewing; JAXA-supported #きぼうを見よう (KIBO宇宙放送局) already provides Japan-specific pass predictions plus 'ARきぼう予報' (AR Kibo Forecast) for free, plus ISS Detector, Heavens-Above, and LaunchDetect cover the same surface.Spot the Station - Apps on Google Play ↗#きぼうを見よう - 国際宇宙ステーションが見える予測日時をお知らせ ↗Best Satellite Tracking Apps for ISS and Starlink (2026) ↗
Weak monetization path: NASA Spot The Station is free with full notifications+AR; JAXA-affiliated #きぼうを見よう is free and event-driven; ISS Detector/Heavens-Above are freemium at low price points. A third Japan-only ISS alert app will struggle to convert users who already have free official options.Spot The Station - NASA ↗Spot the Station Alternatives - Explore Similar Apps & Services ↗
ISS is funded through ~2030 and Japan (JAXA/Kibo) sustains public engagement campaigns; demand should persist for years, though the niche is event-driven around bright passes rather than daily use.#きぼうを見よう - 国際宇宙ステーションが見える予測日時をお知らせ ↗
Technically trivial to build: free orbital TLE/SGP4 APIs (e.g., n2yo), ARKit/ARCore for AR overlay, geofenced push notifications — all well-trodden building blocks.THE SPACE STATION NOTIFICATION TOOL - N2YO.com ↗