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> The most downloaded ISS spotting app on iOS!
> 5 star rating
> Used by astronauts and astronomers
> No ads. 100% functionality in the free version

ISS Spotter makes it easy for you to spot the International Space Station (ISS). You can see the forecast of visible passes and set alarms to be on time to view the ISS. The built in compass and tools will allow you to spot the ISS easily.

This app requires an Iphone 4S or better and iOS7+. Works on iPhone and iPad (full screen)

iOS Store Category:

Primary: Education

Secondary: Utilities

App Store

Total Ratings



ISS Spotter screenshot 1ISS Spotter screenshot 2ISS Spotter screenshot 3ISS Spotter screenshot 4

Version History

Launched May 07, 2012 (almost 8 years ago).

Releasing new versions every 4 months, on average.

Dec 20
Version 1.6.1

- fixed bug for notifications in iOS7

Dec 13
Version 1.6.0

Bug fix for notifications

Dec 30
Version 1.5.1

- Fix for notification permissions (alarms were not always working in iOS8)

Nov 21
Version 1.5.0

- Feature: iOS8 + iPhone 6 compatible
- Feature: added social Sharing options
- Feature: better address lookup
- Bug fix for earliest/latest alarm windows
- Bug fix for menu styling
- fixed typos
- added FAQs

Nov 01
Version 1.4.1

- Bugfix for maps when resuming app
- Bugfix for the ISS path that caused straight lines
- Map is centered after resuming app
- Removed Apple connection error

Oct 11
Version 1.4.0

- iOS7 ready
- Feature: added option to choose a custom location and to calculate passes for a custom location
- Feature: choose the number of minutes the alarm goes off before the pass
- Changed the algorithm to include passes when the sun is 5 degrees below the horizon instead of 6
- Changed beta Space-Track.org to stable Space-Track.org
- Bugfix for alarm settings between 23h and 24h

Nov 30
Version 1.3.1

- Feature: added ISS Quick facts in the Settings screen
- Improvement: split settings for 12/24h time notation and distance in km/miles
- Bugfix for alarm time constraints that occured with 12AM.
- Bugfix for shadow times in compass screen
- changed default forecast to 7 days instead of 5 days
- Remove path on/off setting as few people used this option

Oct 30
Version 1.3.0

- Feature: added magnitude
- Feature: all distances are now shown in miles for non-metric users
- Improvement: the algorithm now includes a shadow calculation to show when ISS enters the shadow
- Improvement: the forecast times are the times the ISS has more than 10 degr elevation for better precision
- Improvement: some small changes in the forecast detail screen
- Improvement: the current pass is always visible for at least 20 mins to prevent 'loosing' the current pass
- Bugfix: better error messages when Celestrack, Amsat or Spacetrack are not responding

Oct 10
Version 1.2.1

- FULL iPad support!
- iPhone 5 support
- Bugfix IOS6: toolbar button in forecast
- User suggestion: remove the bar in the position screen

Sep 27
Version 1.2.0

- Feature: choose TLE source (Celestrack, Amsat or Spacetrack)
- Refactored notifications with new library
- Refactored ISS path with other library
- Changed algorithm to anticipate on ISS orbit changes
- Added option to make donations
- Bugfix: default weekend latest option was set to 12PM instead of 12AM
- Bugfix: sometimes the compass was not initiated.
- Bugfix: better interaction when switching between 24h/AMPM
- Bugfix: better caching for kepelements for better precision. Cache is now 1h with an option to reset it

Aug 14
Version 1.1.2

- Feature: added 12h (AM/PM) time notation option
- Feature: added option to set any time window
- Feature: forecast and compass now work without internet connection
- Bugfix: canceling individual alarms didn't always work

Jul 22
Version 1.1.1

- bugfix for crashes in v1.1.0

Previous version (v1.1.0)
- Feature: added forecast path
- Feature: added settings to enable or disable path
- Feature: stored settings on iphone (instead of memory)
- Bugfix: app crashed when using manual and auto alarms at the same time
- changed default minimum elevation to 20°

Jul 18
Version 1.1.0

- Feature: added forecast path
- Feature: added settings to enable or disable path
- Feature: stored settings on iphone (instead of memory)
- Bugfix: app crashed when using manual and auto alarms at the same time
- changed default minimum elevation to 20°

Jun 11
Version 1.0.2

- Bugfix: better error messaging for retrieving keplerian elements
- Bugfix: badges were not removed after alerts
- Bugfix: home button on position screen didn't function accurately. Made a quickfix for this.
- Feature: minimum peak elevation angle option in settings screen
- Feature: added cache reset option to settings screen

May 23
Version 1.0.1

- Bug fix: activity indicator on forecast screen was not always visible
- Feature: updated some icons
- Feature: added lock to the position screen
- Feature: KepElements are now cached for one week
- Feature: small improvements to alarm settings

May 07
Version 1.0

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