# Blue Hour (Solar Calculator) — Plan & calculate photo times

> Solar calculator for photography planning, sunrise, sunset, and moon events. (iPhone/iPad app by Robert Ehrhardt.)

- Source: https://appshunter.io/ios/app/blue-hour-solar-calculator/id1027013900 (this page in markdown: same URL + `.md`)
- Developer: [Robert Ehrhardt](https://appshunter.io/developer/1027013898)
- Category: Photo & Video, Productivity
- Price: $1.99
- Rating: 4.40/5 from 11 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 21 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, European Spanish
- Released: 2015-08-31
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/blue-hour-solar-calculator/id1027013900/reviews.md

## What is Blue Hour (Solar Calculator)?

The Blue Hour describes a period of dawn and dusk, when the sky is colored specially which is very interesting for photography. The duration and timing of the Blue Hour varies depending on location and on the date. In order to achieve optimum results and to plan in advance the app Blue Hour (solar calculator) has been developed.

The calculations are not only limited to the blue hour. Further information for sun and moon events can also be calculated. This includes information about sunrise, sunset together with data of the blue hour, golden hour and twilight times (civil, nautical and astronomical). Furthermore you can calculate information about moonrise, moonset, moon phases and moon illumination (calculated data are approximations of +/- 1 day accuracy).

In this app you can view data for multiple locations. These can be defined manually or automatically by getting your GPS location. Additionally you have the opportunity to manually set timezones of the locations, which can be helpful if you are planning trips to locations with another timezone than the one, where you currently are in.

Core features at a glance:
• Calculation of sunrise, sunset and solar noon
• Calculation of moonrise and moonset, moonphase and moon illumination
• Calculation of civil blue hour
• Calculation of twilight times (civil, nautical and astronomical)
• Calculation of golden hour
• Visualization of the azimuth-data of sunrise, sunset, moonrise and moonset
• Visualization of the azimuth-data of sun and moon for specific time
• Reminder for events
• monthly forecast
• 5 days weather prediction
• definition of multiple locations, including current position (based on GPS)

Note: the calculated values are approximations. Additionally it depends on weather situation, how good or if any solar event is visible.

## Key features

- Blue hour, golden hour, and twilight calculations
- Sunrise and sunset times
- Moonrise, moonset, and moon phase data
- Multi-location support with GPS
- Weather forecast integration
- Event reminders

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/blue-hour-solar-calculator/id1027013900/reviews.md

### 3/5 — Calendar function keeps crashing

*2025-01-09, version 4.5*

The app is beautiful and well designed but the calendar reminder function is completely broken, which is what I bought this app for. The app just crashes whenever you try to use it.

### 5/5 — Great App.

*2017-08-14*

I love your app, at first I difficulty enabling the GPS but once it got enabled it worked like a breeze.

**Developer response:** Hello,

when adding/editing just enable "Use current location (GPS)" to get current position when choosing the location. Its working perfectly fine on all my testing devices.

See https://reneph.de/en/blue-hour/blue-hour-for-ios/help/#add_location

Best wishes

### 1/5 — Review

*2017-02-17*

Seems like a neat app but after I purchaser it I was never able to enter my location. It would just return the initial screen. Contacted support and they replied but not able to fix problem. So it was useless.

### 5/5 — Great for the price

*2016-11-13*

Compared to a lot of the other apps that do a similar thing this one stacks up quite well.  Especially when you look at the prices.  It could use a few enhancements but it is great at what it does.

### 4/5 — Needs to show direction you're facing

*2016-06-06*

It's good for shooing times and directions. Would be greatly improved by adding a VR aspect. Also if the map would show the direction you're facing that would be great.

### 5/5 — Great app!

*2016-02-02, version 1.7*

Fantastic app for photographers

## Frequently asked questions about Blue Hour (Solar Calculator)

### What is the Blue Hour app?

The Blue Hour app is a solar calculator designed to help photographers plan shoots. It calculates precise times for the blue hour, golden hour, twilight, sunrise, sunset, and moon events.

### How accurate are the calculations in Blue Hour?

The calculated values in Blue Hour are approximations. The visibility of solar events also depends on weather conditions.

### Can I use Blue Hour for multiple locations?

Yes, Blue Hour allows you to define and view data for multiple locations. You can set these manually or automatically using your device's GPS.

### Does Blue Hour offer weather information?

Yes, Blue Hour includes a 5-day weather prediction to further assist in planning your outdoor photography sessions.

### What devices is Blue Hour available on?

Blue Hour is available on iPhone, iPad, and iPod, indicated by its support for these devices.

### How much does Blue Hour cost?

Blue Hour is a paid application, with a price of $1.99.

### When was Blue Hour last updated?

The latest version of Blue Hour was released on January 10, 2020. The app was initially released on August 31, 2015.

### What is the age rating for Blue Hour?

Blue Hour has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 4.5 — 2020-01-10

• iOS 13 adaptions + dark mode support
• Bugfixes

If you love Blue Hour (Solar Calculator), please leave a review on the App Store.

### 4.3 — 2019-11-07

• iOS 13 adaptions + dark mode support
• Bugfixes

If you love Blue Hour (Solar Calculator), please leave a review on the App Store.

### 4.2 — 2019-11-04

• iOS 13 adaptions + dark mode support
• Bugfixes

If you love Blue Hour (Solar Calculator), please leave a review on the App Store.

### 4.0 — 2019-10-15

• iOS 13 adaptions + dark mode support
• Bugfixes

If you love Blue Hour (Solar Calculator), please leave a review on the App Store.

### 3.2 — 2018-12-09

• Bugfixes
• better support for Notch-devices

If you love Blue Hour (Solar Calculator), please leave a review on the App Store.

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## More apps by Robert Ehrhardt

- [Password Safe and Manager](https://appshunter.io/ios/app/password-safe-and-manager/id1079505348)
- [CashOwl: Money Budget Tracker](https://appshunter.io/ios/app/cashowl-money-budget-tracker/id6745316906)
- [PawTricks - Dog Trick Training](https://appshunter.io/ios/app/pawtricks-dog-trick-training/id6758439724)
- [SolCalc - Solar Calculator](https://appshunter.io/ios/app/solcalc-solar-calculator/id6761290665)

All apps by Robert Ehrhardt: https://appshunter.io/developer/1027013898

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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 2026-06-10.*