Observer Pro vs Equal Earth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Observer Pro
This app helps advanced astronomers and astrophotographers plan their observing sessions. It predicts object visibility, factoring in local obstructions, and provides weather forecasts. Manage observing lists and favorite sites to maximize your stargazing time.
- 14,000+ deep sky objects with photos
- Local horizon profile measurement
- Object visibility prediction charts
- Featured object recommendations
- Favorite observing site management
- Astronomical weather forecasts
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Observer Pro is an indispensable app for advanced astronomy observing and astrophotography planning. No more guessing when that galaxy emerges from behind that tree. No more estimating how many hours you'll be able to image an object. Observer Pro gives every astronomer the info they need to make the most of their observing right at their fingertips! What astronomers are saying: "Every astronomer with an iPhone should own this app!" - Astronomy Technology Today magazine "Observer Pro is the most impressive astronomy app that I have tried out. I enthusiastically commend it to you!" - Tom Mote, Professor Emeritus, Astronomy "I have been using it since the day it first became available and I cannot live without it now." - Sedat B., Cloudy Nights forum Feature highlights: • Over 14,000 deep sky objects included, all with closeup reference photos. No need to download anything after install! Sorting and search make it easy to sift through all of them to find which objects belong on your observing list. • Measure your local horizon profile in minutes with your iPhone. • Unique charts completely take the guesswork out of predicting object visibility. Your house, trees, mountains, or any other obstructions are completely factored in to all visibility charts. • New to astronomy? The Featured object list shows a list of objects specific to your location and local horizon that are great for observing right now. • Keep a list of your favorite observing sites, each with their own local horizon profile. Compare object visibility between sites to find the best spot to setup your scope. • There's a lot to observe! Observer Pro gives you a place to maintain a list of your favorite objects as well as an observing list that you can take with you to the eyepiece. • 7Timer! astronomical weather forecasts for your observing sites are viewable without leaving Observer Pro. They give you the outlook on cloud cover, seeing, transparency, and more. • Check out the in-app help to learn more about how to use the many features that come with Observer Pro. Keep up-to-date with the latest news at the Observer Pro blog: http://observer.pro/blog
Equal Earth
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See the world as it really is. Most world maps stretch the far north and south, so Greenland looks as big as Africa. Equal Earth uses an equal-area projection: every country appears at its true relative size. Explore, compare, play and design your own maps on iPhone, iPad and Mac. ATLAS • A full-screen world map with 241 countries, territories and regions • Tap any country to see its size, world rank, share of world land and a familiar comparison • 12 map styles, from Political and Original Artwork to Midnight Gold and Nordic Air • Country labels, rivers, lakes and graticule, all offline COMPARE • Line up countries side by side on one shared scale • Overlay shapes and drag them around to see the real difference • Ready-made ideas: The Giants, Greenland vs. DR Congo, Africa’s largest and more QUIZ • Daily Challenge: five mixed questions, the same for everyone each day, with streaks • Find It: tap the country on the map • Which Is Bigger?: two shapes, one true answer • Name the Shape: recognise a country by its outline • Pick a region and level; personal bests are saved MY WORLD • Mark places you have been and places you want to go • See how much of the world you have explored, across six continents • Turn your travels into a poster with one tap MAP STUDIO • Paint countries directly on the map, using your legend categories as brushes • Add a title, subtitle, footer, labels and up to six legend categories • 10 designer palettes plus custom colors • Export PNG or JPEG up to 7200 × 4800 pixels, or a vector PDF that stays sharp at any print size • Keep multiple designs and move editable map files between devices PRIVATE BY DESIGN No account. No ads, in-app purchases, analytics or tracking. Everything stays on your device and works offline. One purchase includes iPhone, iPad and Mac. Cartography: Tom Patterson / Equal Earth. Equal Earth projection by Bojan Šavrič, Tom Patterson and Bernhard Jenny. Made with Natural Earth. Areas are approximate measurements of the map geometry. Small island symbols may be enlarged; boundaries and names follow the source artwork.
Screenshots
Verdict
The clearest difference is update cadence: Equal Earth at monthly against Observer Pro's every 6 months. Equal Earth also leads on price ($8.99 vs $13.99) and device support (3 vs 1). On ads, in-app purchases 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
Observer Pro costs $13.99 and Equal Earth $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Observer Pro ships an update every 6 months, Equal Earth monthly. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | Observer Pro | Equal Earth |
|---|---|---|
| Price | $13.99 | $8.99 — better |
| Rating | 4.6 (49 ratings) — better | — |
| Positive reviews | 79.2% of reviews | — |
| Number of ratings | 49 — better | — |
| Update frequency | Every 6 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone | iPhone, iPad, Mac — better |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 241 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Joshua Bury | Nha HOANG |
Bugs and requests
Observer Pro
Reported bugs
10 issues- App crashes when selecting catalog groupings (Galaxy, Planetary Nebulae, etc.)
- iOS keyboard doesn't dismiss on iPad after clicking Done
- Observer lists and custom data disappearing after app closure
- Search feature missing in version 1.4
- Continuous crashes since recent updates
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- Horizon drawing feature unreliable - drifts while drawing
- Menu items on far right side of screen unresponsive
- Incompatibility with iOS 8 (historical)
- App crashes on startup with certain iOS versions
- Weather feature broken
Requested features
16 requests- iPad native app with landscape mode support
- Search functionality restoration/improvement
- Export observer lists to other apps (Sky Safari, etc.)
- Support for planets, comets, and asteroids
- Observing notes and session logging
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- Field of view/scope focal length comparison
- Color object photographs
- Additional catalogs (Sharpless, etc.)
- Moon visibility in sky view
- Azimuth-based sorting for telescope positioning
- Filter options for object types
- Cross-device syncing between iPhone and iPad
- Print functionality for observing plans
- User-created custom catalogs
- Screen auto-rotation support
- Weather forecast integration
Equal Earth
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Observer Pro
No in-app purchases
Equal Earth
No in-app purchases








