# HikariYomi — AR Sun, Shadow & Astro Guide

> AR Sun, Shadow & Astro Guide (iPhone/iPad app by Keita Morozumi.)

- Source: https://appshunter.io/ios/app/hikariyomi/id6812362256 (this page in markdown: same URL + `.md`)
- Developer: [Keita Morozumi](https://appshunter.io/developer/6778615629)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.2 · 7 MB
- Languages: American English, Japanese
- Released: 2026-09-25
- Data updated: 2026-10-14
- User reviews in markdown: https://appshunter.io/ios/app/hikariyomi/id6812362256/reviews.md

## What is HikariYomi?

HikariYomi is an advanced AR solar telemetry and natural light scouting tool crafted specifically for photographers, cinematographers, and visual artists.

"Where will the light fall, and where will shadows stretch at this exact location and time?"
Experience seamless fusion of augmented reality and high-resolution satellite cartography to orchestrate your lighting setup with surgical precision.

---

KEY CAPABILITIES:

◆ AR Live Solar & Shadow Telemetry
- Direct camera AR overlay displaying real-time celestial trajectory, solar altitude, and azimuth until sunset/twilight.
- Interactive Ground Shadow Vectors dynamically projecting shadow direction and multiplier ratios.
- Cinema lens field-of-view (FOV) framing guides (Anamorphic, Full Frame, Super 35, APS-C).

◆ Satellite Map Planner
- Drop a pin anywhere across the globe to simulate sunlight rays and casting shadows across satellite terrain.
- Granular time-scrubber to travel across 1-minute increments for upcoming weeks.
- Unlimited custom spot bookmarking with exact coordinates.

◆ Atmospheric Optics & Sunset Prediction
- Real-time weather telemetry powered by Apple WeatherKit.
- Proprietary 3-tier cloud breakdown (Low, Mid, High layers) with sunset vividness scoring.
- Golden hour and blue hour duration countdowns.

◆ Astrophotography & Nightscape Guide
- Precise moon phase, illumination percentage, and moonrise/set schedules.
- Galactic Center (Milky Way core) azimuth, elevation, and optimal dark-sky window tracker.
- Built-in NPF Rule and 500 Rule astrophotography exposure calculator.

◆ Deep iOS Integration
- Dynamic Island and Lock Screen Live Activities for magic hour countdowns.
- Home Screen Widgets for instant glanceable light telemetry.
- Haptic feedback and organic sound design (fully respectful of Silent Mode).

Never miss golden hour again. Unlock the language of natural light with HikariYomi.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HikariYomi PRO | $6.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/hikariyomi/id6812362256/reviews.md

### 3/5 — マップ機能がいまひとつ

*2026-10-06*

なぜ住所検索した際に検索地に飛ばないんだろう？
現在地のまま。
テストしてます？

**Developer response:** vanessa-w 様
「光読み」をご利用いただき、また不具合のご報告をいただき誠にありがとうございます。

住所検索時に地図が検索地点へ自動で移動しない不具合を確認し、直ちに修正いたしました。ご不便をおかけし大変申し訳ございませんでした。

本日、修正を反映したバージョン 1.0.5 を App Store へ提出完了いたしました。審査通過後、数時間〜1日程度でアップデートが利用可能になりますので、ぜひ最新版にてお試しください。

アプリの品質向上に繋がる重要なフィードバックをいただき、心より感謝申し上げます。

### 5/5 — ロケハンにも最適

*2026-10-03*

個人的にはロケーションの記録に於いて最適な手放せないツールだと思います

### 3/5 — Proへのアップグレードについて

*2026-10-01*

無料版からProへアップグレードしたいのですが、「アプリ内購入は許可されてません」と表示されます。どうすれば購入出来ますか？

**Developer response:** aipon777様、光読み（HikariYomi）をご利用いただき、また Pro へのアップグレードをご検討いただき誠にありがとうございます！

「アプリ内購入は許可されていません」と表示される現象は、iPhone の「スクリーンタイム（機能制限）」によって端末全体でアプリ内課金が制限されている際に、iOS システムより表示されるものとなります。

お手数をおかけいたしますが、以下の手順で iPhone 本体の設定をご確認いただけますでしょうか。

【設定の確認・変更手順】
1. iPhone の「設定」アプリを開く
2. 「スクリーンタイム」をタップ
3. 「コンテンツとプライバシーの制限」をタップ
4. 「iTunesおよびApp Storeでの購入」をタップ
5. 「App内課金」をタップし、「許可」に変更する

※スクリーンタイムのパスコードが求められる場合や、ファミリー共有等で保護者様が管理されている端末の場合は、管理者による解除が必要となります。
※会社・学校支給の端末の場合、管理プロファイルにより制限されている場合がございます。

上記を「許可」にしていただいた後、アプリ内の「Pro」画面より再度ご購入をお試しいただけますと幸いです。今後とも光読みをよろしくお願いいたします！

### 4/5 — 写真撮影の機能が一つにまとまったアプリ

*2026-09-28*

機能が充実しており、購入してよかったと思います。写真家向けアプリですが、旅行を計画するなどの用途にも非常に適しているのではないかと

一方、まだ新しいアプリということもあり、改善してほしい点もあります。まず、一部の画面ではスクロール時のフレームレート低下が目立ち、操作がやや重く感じます。今後のパフォーマンス改善に期待しています。

また、各機能間のデータ連携がさらに進むと、より完成度が高くなると思います。例えば「今月の天体好機」では新月付近の日がスコア100になりますが、実際には雲が多く星空を撮影できない日でも高得点になります。すでに天気情報があるので、月齢・月光・銀河の位置と気象条件を組み合わせた総合的な「天体撮影スコア」があると非常に便利だと思います。

Street Viewのような遠隔ロケハン機能も今後追加されれば嬉しいですが、現時点でも写真・旅行用アプリとしてかなり魅力的です。今後のアップデートを楽しみにしています。

**Developer response:** Sei2099様　Pro版のご利用とあたたかい高評価、誠にありがとうございます。

いただきました「画面スクロールの軽量化」および「天気予報・雲量を連動させた天体撮影総合スコア」は、早速次期バージョン（v1.0.3）にて実装させていただきます。アップデート公開の折にはぜひ体感いただけますと幸いです。

当アプリでは、ユーザーの皆様と一緒に“最高の撮影ツール”を創り上げたいと考えております。レビューをご覧の皆様も、気になる点やご要望がございましたらぜひお気軽にレビュー欄やサポートまで声をお聞かせください。引き続きよろしくお願いいたします！

## Version history (last 5 releases)

### 1.0.6 — 2026-10-11

Thank you for using HikariYomi. Version 1.0.6 introduces worldwide scouting locations, instant AR recalibration, and critical timezone fixes for international expeditions.

[Worldwide Photo Spots & Spot Customization]
- Refreshed default photo locations with world-renowned landscapes (e.g., Mount Fuji / Lake Motosu, Kirkjufell in Iceland, Brooklyn Bridge in NY).
- You can now edit, add, and manage preset locations to build your own personal global scouting roster.

[Comprehensive Global Timezone Fix]
- Completely resolved an issue where timeline slider scrub positions drifted from finger touch input when scouting locations in different timezones.
- Sun/moon trajectories, cast shadows, and hourly timelines now strictly adhere to the destination's local timezone with 100% accuracy.

[One-Tap AR Heading Recalibration]
- Added an instant AR Heading Reset button to effortlessly recalibrate camera compass alignment when walking around on site.
- Enhanced lunar overlay clarity and visibility.

[Unified Map & Weather Experience]
- Unified location and simulated datetime synchronization across the Weather and Map tabs, with a dedicated "NOW" button to instantly return to live tracking.
- Persistent Map Mode: Your choice of Satellite Imagery vs. Standard Map is now saved across app launches.
- Eliminated accidental pin selection zoom anomalies for smoother map navigation.

### 1.0.5 — 2026-10-10

Version 1.0.5
- Map Fix: Resolved an issue where searching for an address or landmark would not automatically re-center and animate the camera to the searched location.
- AR View Optimization: AR camera mode is now locked to your actual current GPS location for seamless on-site ephemeris planning. Tapping the location header navigates straight to the Map tab for exploration.
- Minor UI polish and stability enhancements.

### 1.0.4 — 2026-10-02

Thank you for using HikariYomi. We deeply appreciate your continued support and warm feedback.
In this update, we have refined the optical accuracy and capabilities of the Prime Lens Simulator:

[Prime Lens Simulator Enhancements]
• Added the classic 28mm focal length frame, widely loved for street and landscape photography (supporting 24mm, 28mm, 35mm, 50mm, 85mm, and 135mm).
• Optimized the frame aspect ratio to match native 35mm full-frame dimensions (2:3), providing an intuitive viewfinder experience tailored to photography framing.
• Achieved 100% optical geometric alignment between "Frame Mode" and "True FOV (Live Zoom)". The scene inside the frame now perfectly matches the zoomed composition.
• Added full-frame 2:3 viewfinder boundary guides in True FOV mode, ensuring precise and reliable framing.

[Performance & Fluidity]
• Optimized date and time calculations on timeline sliders, delivering buttery-smooth 120Hz ProMotion scrubbing on Map and AR views.
• Corrected dynamic version display in Settings.

[Direct Support Access]
• Added a direct feedback link in Settings to send suggestions and feature requests straight to our development team.

We remain dedicated to building the ultimate optical ephemeris and scout tool for photographers worldwide.

### 1.0.3 — 2026-10-01

Thank you for using HikariYomi! Based on valuable community feedback, this update brings major performance enhancements and smarter field-planning tools:

• Ultra-Smooth 120Hz ProMotion Scrolling:
Completely optimized list and card rendering across Weather, Astro, and Planning sheets for fluid, responsive scrolling.

• Weather-Integrated Astro Ratings (BEST ASTRO NIGHTS):
We now combine real-time 16-day cloud cover and precipitation forecasts with lunar phase and Milky Way visibility. The app penalizes overcast nights so you only see truly clear, prime shooting opportunities.
Tap any recommended night to jump straight to the optimal 23:00 celestial simulation.

• Enhanced Multi-Layer Cloud Breakdown:
Intuitive suitability indicators for low, mid, and high-altitude clouds, making sky-clarity assessments effortless in the field.

• Refined Bilingual Localization:
Polished English formatting for all astronomical status messages and dates.

• Stability & Polish:
Memory optimizations and internal caching enhancements.

We love hearing your feedback! Please feel free to leave a review or share your thoughts for future updates.

### 1.0.2 — 2026-09-29

Thank you for using HikariYomi. Version 1.0.2 brings important precision refinements and battery optimizations:

• Scout Photo Compositing: Enhanced celestial path alignment to accurately match camera orientation and lens field of view.
• Astro & Lunar Telemetry: Upgraded coordinate tracking for the Moon and Milky Way Galactic Core to deliver precise true-heading alignment. Improved zero-crossing calculation for moonrise and moonset times.
• Battery & Thermal Efficiency: Introduced intelligent ARSession lifecycle management that automatically pauses camera tracking while browsing Map, Weather, and Calculator tabs.
• UI & Performance: Refined HUD telemetry layouts and overall system stability.

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## More apps by Keita Morozumi

- [BURGER](https://appshunter.io/ios/app/burger/id6778615627)
- [DARUMA UP](https://appshunter.io/ios/app/daruma-up/id6782046768)
- [jelly. — Soft. Simple. Yours.](https://appshunter.io/ios/app/jelly-soft-simple-yours/id6809633956)
- [galaxy. — Deep. Cosmic. Yours.](https://appshunter.io/ios/app/galaxy-deep-cosmic-yours/id6811849769)
- [wave. — Flow. Pulse. Drift.](https://appshunter.io/ios/app/wave-flow-pulse-drift/id6813854262)

All apps by Keita Morozumi: https://appshunter.io/developer/6778615629

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-14.*