Observer Pro vs Sit Verba
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
Read full descriptionHide full description
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
Sit Verba
This app offers a digital flashcard system for learning Latin. Users can create personal dictionaries or utilize a pre-loaded beginner vocabulary. It supports adding detailed grammatical information and includes achievement tracking.
- Personalized word dictionary
- Pre-populated beginner vocabulary
- Noun declension and verb conjugation entry
- Achievement unlocking and sharing
- Word export and import functionality
Read full descriptionHide full description
Sit Verba is a free flashcards app for students of Latin. Enter words in your personal dictionary or use a pre-populated beginner dictionary. The beginner dictionary has over 900 words in it. Then round out your dictionary as you progress. Add and edit noun declensions or verb conjugations as you complete your studies. Unlock rewarding achievements, and share them via Messages. Export and import individual words with others.
Screenshots
Verdict
The clearest difference is price: Sit Verba at Free against Observer Pro's $13.99. Sit Verba also leads on rating (5.0 vs 4.6) and update cadence (every 6 weeks vs every 6 months). Observer Pro's advantage is ratings volume (49 vs 2) and iOS requirement (16.4 vs 26.2). On ads, in-app purchases and device support 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
Sit Verba is free to download; Observer Pro costs $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Sit Verba holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Observer Pro has 49 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 79% of Observer Pro's written reviews are positive against 100% of Sit Verba's.
Observer Pro ships an update every 6 months, Sit Verba every 6 weeks. The most recent releases landed on October 8, 2026 and September 28, 2026 respectively.
| Parameter | Observer Pro | Sit Verba |
|---|---|---|
| Price | $13.99 | Free — better |
| Rating | 4.6 (49 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 79.2% of reviews | 100.0% of reviews — better |
| Number of ratings | 49 — better | 2 |
| Update frequency | Every 6 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.4 — better | 26.2 |
| Further details — not scored | ||
| Size | 241 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Joshua Bury | David Johnson |
Customer experience
Observer Pro
Sit Verba
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
Show 5 moreShow fewer
- 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
Show 11 moreShow fewer
- 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
Sit Verba
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Observer Pro
No in-app purchases
Sit Verba
No in-app purchases







