Comparison

Satellite Tracker by Star Walk vs Modern GB Stamp Decoder

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Satellite Tracker by Star Walk

Track satellites in real-time, including the ISS and Starlink. Get predictions for upcoming passes and set alerts. Explore satellite orbits and trajectories with various viewing modes.

Highlights
  • Real-time satellite tracking
  • Satellite flyby timer
  • Pass predictions
  • Customizable location
  • Fly-with-satellite view
  • Satellite orbit over Earth
Features
Read full description

Observe the International Space Station in the sky above you and find out where human-made satellites are right now with SATELLITE TRACKER by STAR WALK! MAIN FEATURES - Real-time satellite tracking - The most outstanding satellites - Satellite flyby timer & pass predictions - Hand-picked passes & customizable location - Fly-with-satellite view - Satellite orbit over Earth Enjoy the easy and comfortable real-time satellite tracking with SATELLITE TRACKER! ► Select a satellite from the list and see its current location in the sky in real-time or track satellite live orbiting Earth. You can track the most famous and brightest satellites, SpaceX’s Stalinks, communications and weather forecasting satellites, and much more! ► At the top of the main screen, the flyby timer counts the amount of time left until the next flyby of the selected satellite over your location. Tap the down arrow to open the list of passes that will be visible from your location in the nearest future. ► Get precise predictions when satellites are visible in the sky above your location. The list of passes allows you to set any alert (one or more) for the satellite's pass that you’d like to witness. Switch between the app’s modes (Globe view, Satellite View, and Sky view) by tapping the round icons at the bottom of the screen. -> Choose Satellite View to enjoy the 3D image of a satellite flying over Earth with the real speed and location. -> Globe view allows you to see a satellite’s trajectory around the Earth's 3D model and on the Earth’s map. -> Find the satellites in the sky by following the arrow pointer with the Sky View mode. The app contains ads. The ISS is available by default. With SATELLITES LIVE subscription, you get an instant ad-free access to tracking satellites live orbiting over Earth and in the sky, the timer for the next appearance, and alerts about the nearest flybys. SATELLITES LIVE is a renewable subscription with a 1-week FREE trial that gives you access to content from within the app on an ongoing basis. Payment will be charged to your iTunes account. At the end of each subscription duration (1 month), the subscription will automatically renew until you choose to cancel it, and your account will be charged for renewal 24 hours before the end of the current period. Users can manage their subscriptions in their account settings on the App Store. Privacy policy: https://vitotechnology.com/privacy-policy.html Terms of use: https://vitotechnology.com/terms-of-use.html Never miss satellites passing by in the sky with SATELLITE TRACKER!

About

Modern GB Stamp Decoder

Features
Read full description

Scan · Decode · Collect. Modern GB Stamp Decoder helps you explore modern Great Britain barcoded stamps and keep a digital record of the items you own. Built for collectors of QEII and King Charles III stamps, it brings scanning, the Modern GB digital Catalogue and your own collection together. SCAN AND DECODE Scan a supported stamp's Data Matrix barcode with your camera, or paste the barcode text. No stamp to hand? Open the example decode to see how it works. Read the decoded information alongside matching catalogue details, including face value, colour, issue date, barcode generation date and security overlays where available. YOUR DIGITAL COLLECTION Save your own stamps, booklets and sheets in clearly separated sections. Record the condition and visible characteristics of your copies, with booklet details kept distinct from the stamps inside. Saved observations belong to your collection; they are not replaced by catalogue updates. CATALOGUE AND CHECKLIST Browse the Modern GB digital Catalogue using our own MGB references. Use the separate checklist to see what you have and need, organised by stamps, booklets and other collecting formats. Choose a simple checklist or separate Mint and Used boxes, and search or filter the catalogue to focus on your interests. GUIDED COLLECTOR CHECKS Compare security backing paper using a step-by-step visual guide. Open it from Scan or while recording an item. Use SBP or PB names in Settings, and choose 'I'm not sure' when a characteristic cannot be established. OPTIONAL PRO FEATURES Start with free stamp decoding and save up to 25 collection items. Five free Collector Checks let you try the guided identification tools. An optional Pro subscription adds unlimited collection saves and Collector Checks, enhanced catalogue detail, advanced decoding features, and Stamp card image and print tools. See the in-app purchase screen for prices and subscription terms. ON YOUR DEVICE No collection account is required. Decoding and collection storage work on your device. Use Back up to keep a separate copy of your saved collection. Cloud collection synchronisation is not included in this version. Decoding and catalogue matching provide collecting information, not proof that a stamp is genuine or valid for postage. Some details require you to examine the physical stamp, booklet or sheet. Some images used with permission of Royal Mail © 2026. Not a Royal Mail product. © 2026 Modern GB Stamps. Privacy policy: https://stampdecoder.app/privacy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Satellite Tracker by Star Walk4 screens
Modern GB Stamp Decoder4 screens

Verdict

The call

The clearest difference is ads: Modern GB Stamp Decoder at none against Satellite Tracker by Star Walk's shown. Modern GB Stamp Decoder also leads on update cadence (every 9 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Satellite Tracker by Star Walk sells 10 in-app purchases, starting at $0.49 per month and Modern GB Stamp Decoder sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Satellite Tracker by Star Walk ships an update every 2 months, Modern GB Stamp Decoder every 9 days. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 8 level
Satellite Tracker by Star Walk versus Modern GB Stamp Decoder: the parameters behind the verdict, then further details
ParameterSatellite Tracker by Star WalkModern GB Stamp Decoder
PriceFreeFree
Rating4.6 (70K ratings) — better—
Positive reviews57.7% of reviews—
Number of ratings70K — better—
Update frequencyEvery 2 monthsEvery 9 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size331 MB96 MB
Age rating4+4+
DeveloperVito Technology Inc.Modern GB

Bugs and requests

Satellite Tracker by Star Walk

Reported bugs

3 issues
  • Unsubscribe button not working
  • Compass issues causing incorrect orientation
  • Occasional crashes and freezes

Requested features

5 requests
  • Add more satellite tracking options
  • Improve pass timing accuracy
  • Provide offline mode for remote use
  • Allow tracking of HAM radio satellites
  • Add more detailed satellite information

Modern GB Stamp Decoder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

Satellite Tracker by Star Walk

Subscriptions8
  • Real Time Satellite Tracking7 Days trial$0.491 Month
  • Satellite Tracker Premium: 1m$0.991 Month
  • Real Time Satellite Tracking7 Days trial$0.993 Months
Show 5 more
  • Satellite Tracker Premium: 1m$1.991 Month
  • Satellite Tracker Premium: 1m3 Days trial$1.991 Month
  • Satellite Tracker Premium: 1y$5.991 Year
  • Satellite Tracker Premium: 1y$7.991 Year
  • Satellite Tracker Premium: 1y3 Days trial$7.991 Year
One-time2
  • Lifetime Premium Access Sale$4.99
  • Lifetime Premium Access$9.99
2 purchases

Modern GB Stamp Decoder

Subscriptions2
  • Pro Core Monthly$0.991 Month
  • Pro Core Annual3 Months trial$9.991 Year

Questions

Is Satellite Tracker by Star Walk free?
Satellite Tracker by Star Walk is free to download, with in-app purchases available.
Is Modern GB Stamp Decoder free?
Modern GB Stamp Decoder is free to download, with in-app purchases available.
Do Satellite Tracker by Star Walk or Modern GB Stamp Decoder have ads?
Satellite Tracker by Star Walk shows ads; Modern GB Stamp Decoder does not.
Which is updated more often, Satellite Tracker by Star Walk or Modern GB Stamp Decoder?
Satellite Tracker by Star Walk ships an update every 2 months, and Modern GB Stamp Decoder every 9 days. Most recently, Satellite Tracker by Star Walk was updated on November 8, 2026 and Modern GB Stamp Decoder on October 30, 2026.

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