# Stars Blinker — Deep-Sky Pics Comparison

> Compares deep-sky astronomical images to detect changes. (iPhone/iPad app by Roberto De Lorenzo.)

- Source: https://appshunter.io/ios/app/stars-blinker/id1569633657 (this page in markdown: same URL + `.md`)
- Developer: [Roberto De Lorenzo](https://appshunter.io/developer/692760870)
- Category: Utilities, Photo & Video
- Price: Free with in-app purchases
- Rating: 4.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 25 MB
- Languages: English
- Released: 2021-07-03
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/stars-blinker/id1569633657/reviews.md

## What is Stars Blinker?

Stars Blinker is aimed to anyone takes Deep-Sky pictures. The app allows to compare two images of the same area taken at different times, with the same or different instruments. Changes, are  highlighted by the blinking of any object (star, asteroid, etc.) that only appears in one of the images or has changed position or brightness between a shot and the next.
 
After shooting pictures of stars clusters, nebulae, galaxies and so on, often you would check if there are changes compared to the “normal" appearance of the photographed area.
 To do it, usually you have to search for a picture (or map) of the same area and check brightness and location of each object.
Unless you have a blink comparator that, alternating the vision of two shots obtained at different times, allows to detect and highlight changes or transient phenomena (comets, variable stars, novae and supernovae, asteroids etc.). In the comparator, the sample image and the reference are shown alternately after being aligned with each other. If  an object is present in only one of the pictures,  it blinks and can be easily found and marked. Instead, if an object has changed position between two shots, during the animation it  bounces back and forth, showing the path traveled.
 
With Stars Blinker you can:
 
- load pictures from the local Photo Gallery or from your iCloud;
- easily align the two images: just mark the same three stars on each picture and press a button:  the sample image is rotated, resized and moved to overlap the reference picture;
- use images made with different instruments (I.e. comparing your picture with snapshots taken from online maps and catalogues);
- manually refine alignment;
- adjust blinking time interval;
- invert colors to compare picture in negative;
- zoom and pan the animation to frame a specific area or to examine in detail the images;
- subtract Reference image from Sample to emphasize any changes;
- insert a mark to highlight the position of a Transient;
- add labels to report subject,  date and time of shooting etc.;
- save animations as short movies  in your local Photo Gallery.

## Key features

- Compare two deep-sky images
- Highlight changes in object position/brightness
- Align images using three stars
- Use images from different instruments
- Adjust blinking interval
- Save animations as movies

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock all features | $1.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/stars-blinker/id1569633657/reviews.md

### 5/5 — A fantastic image comparison product - for target shooters

*2022-01-19*

Sometimes when paper target shooting the target can get so cluttered with holes it’s difficult to tell where the last shot landed even with a secondary spotter looking straight at it. By turning up the image subtraction in negative image mode any changes are immediately highlighted making this the best & as far as I am aware only digital target spotter on the I Apple market. Understandably this is not what the product was designed for & there is a bit of fiddling to take & import photos between shots but I would encourage the developer to diversify this product into a fully automated spotter that triggers on the bang or at the push of a button & highlight the changes between successive shots on the Apple Watch screen so as not to disturb the aiming position. Note - to use this as a spotter you will need to mount your iPad or iPhone on a spotting scope with one of the many aftermarket scope/phone mounts to get a clear enough image to reliably process the result.

**Developer response:** Thank you for your very interesting message and compliments for your idea. Stars Blinker App was made and is mostly used in Search of  Extragalactic Supernovae / Novae and actually suceeded in finding and confirm some Transients.
May you please contact me at info@impararegiocando.it? I would like to know some details in order to start testing. I’m very new in this field, but I was thinking if  a digital target spotter could as well track the order of the shots, calculate, keep, show scores etc.

## Frequently asked questions about Stars Blinker

### What is Stars Blinker used for?

Stars Blinker is designed for deep-sky photographers to compare two images of the same celestial area taken at different times. It highlights any changes in object position or brightness by blinking them, helping users detect phenomena like variable stars or asteroids.

### How does Stars Blinker align images?

Image alignment in Stars Blinker is straightforward. Users mark the same three stars on each picture, and the app automatically rotates, resizes, and moves the sample image to overlap the reference picture. Manual refinement is also available.

### Can I use images taken with different equipment?

Yes, Stars Blinker supports comparing images made with different instruments. This allows you to compare your own photographs with snapshots taken from online maps and catalogues.

### What kind of celestial changes can Stars Blinker detect?

Stars Blinker can detect various changes, including the appearance or disappearance of objects like stars and asteroids, changes in their position, and variations in their brightness. It is also useful for spotting transient phenomena.

### Does Stars Blinker have ads?

Stars Blinker is ad-free, allowing for an uninterrupted user experience while analyzing astronomical images.

### What devices does Stars Blinker support?

Stars Blinker is currently supported on iPads, providing a larger screen for detailed image analysis.

### How often is Stars Blinker updated?

Stars Blinker was last updated on July 3, 2021, with version 1.0. Information on future update frequency is not available.

### What is the user rating for Stars Blinker?

Stars Blinker has a rating of 4.0 stars based on one review. This indicates a generally positive user reception.

## Version history (last 1 release)

### 1.0 — 2021-07-03

No release notes.

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## More apps by Roberto De Lorenzo

- [Cerca Tutto!](https://appshunter.io/ios/app/cerca-tutto/id740743009)
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- [Instant Reading](https://appshunter.io/ios/app/instant-reading/id1447814060)

All apps by Roberto De Lorenzo: https://appshunter.io/developer/692760870

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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 2026-06-11.*