Comparison

CloudWatcher vs GRE Calculator

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

Head to head
About

CloudWatcher

Identify cloud types using AI or manual input. Save photos with location data, share them, and deepen your knowledge with an encyclopedia and quizzes. An AI chatbot can answer your cloud-related questions.

Highlights
  • AI cloud identification
  • Manual cloud type selection
  • Save cloud photos with location
  • Share photos via social media
  • Cloud encyclopedia
  • Cloud quizzes
  • AI chatbot for cloud questions
Features
Read full description

Look up at the sky, with new eyes. CloudWatcher is an all-in-one cloud observation app: identify clouds with AI, learn from a built-in field guide, take quizzes, log every sky you see, and never miss a rainbow or sunset. Features Cloud AI Identification Take a photo and let AI identify it across 10+ cloud types (cirrus・cumulus・stratus and more) with explanations of weather conditions and how to spot each one. AR Labeling (New) Point your camera at the sky and tap any cloud. AI labels stick in 3D space so you can compare multiple cloud types at once. Today's Sky Live Activity (New) Your Lock Screen and Dynamic Island show what's likely in today's sky in chronological order: rainbows・sunsets・sunrises・halos・cirrus days・stargazing nights. Smart Sky Alerts (New) Forecast and sun position predict moments like "Rainbow likely" or "Beautiful sunset expected" and notify you just in time. Each alert type can be toggled. Cloud Field Guide The 10 WMO cloud genera with photos・characteristics・meteorological context. Jump straight from the guide into capture mode. Cloud Quizzes Three difficulty levels (beginner・intermediate・advanced) to sharpen your observation skills. Map and Statistics See all your captures on a map. Track your most-photographed cloud types over time. AI Chat Ask questions about clouds and weather using your own photos as context. For ・Sky lovers and amateur meteorologists ・Kids' science projects and classroom use ・Studying for meteorology exams ・Capturing memorable skies on travels Compatibility ・iOS 17.6 or later ・Live Activity and Dynamic Island (iPhone 14 Pro and newer) ・AR Labeling requires A12 Bionic or newer ・English and Japanese Weather powered by Apple WeatherKit. Cloud identification powered by cloud AI.

About

GRE Calculator

Practice for the GRE Quantitative section with a calculator that mimics the restrictions of the official exam. Avoid unrealistic expectations from generic calculators by using a tool designed for accurate GRE preparation.

Highlights
  • Mimics official GRE exam calculator restrictions
  • Realistic practice experience
  • Enforces mathematical order of operations
  • Handles large numbers and undefined computations
  • Digit display limits and rounding
  • GRE Exam Style interface
Features
Read full description

GRE Calculator is for students preparing to give the GRE exam. The calculator offered here is one that's very similar to the one offered during a GRE exam's Quantitative section, because it follows the same operational restrictions. Other generic calculators aren't tailored specifically for GRE exam practice, which is why using them for practice isn't recommended because it gives students unrealistic expectations of what to expect during an actual GRE exam. Given below are *some* of the rules enforced by the on-screen calculator supplied during a GRE exam. GRE Calculator here follows these same rules, giving students a more realistic practice experience: 1) No exponent notations are used or allowed. 2) Use of parenthesis is allowed only to a single degree (i.e. nested parenthesis isn't allowed). 3) Any number with an absolute value larger than 99,999,999 is not displayed, and instead the phrase "Error" is displayed. 4) At any time, no more than 8 digits are shown on the screen. Rounding off is used where needed to meet this requirement. 5) Any computation performed that is mathematically undefined, results in the "Error" message being displayed. 6) Mathematical 'order of operations' is enforced. For example, if calculating 8 + 5 x 3 from left to right, the answer would be 23, not 39. ........... and there's still more! GRE Calculator also offers a style called 'GRE Exam Style', which makes the calculator look strikingly similar to the calculator offered during an actual GRE exam. This offers an even more realistic practice experience for all those using GRE Calculator.

Screenshots

CloudWatcher4 screens
GRE Calculator4 screens

Verdict

The call

The clearest difference is price: GRE Calculator at Free against CloudWatcher's $0.99. GRE Calculator also leads on review sentiment (81% vs 50%) and ratings volume (374 vs 1). CloudWatcher's advantage is rating (5.0 vs 4.5) and update cadence (every 2 weeks vs every 24 months). On ads, 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

GRE Calculator is free to download; CloudWatcher costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

CloudWatcher holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: GRE Calculator has 374 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 50% of CloudWatcher's written reviews are positive against 81% of GRE Calculator's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

CloudWatcher ships an update every 2 weeks, GRE Calculator every 24 months. The most recent releases landed on September 20, 2026 and July 4, 2026 respectively.

Scorecard6 real differences · 4 level
CloudWatcher versus GRE Calculator: the parameters behind the verdict, then further details
ParameterCloudWatcherGRE Calculator
Price$0.99Free — better
Rating5.0 (1 ratings) — better4.5 (374 ratings)
Positive reviews50.0% of reviews80.8% of reviews — better
Number of ratings1374 — better
Update frequencyEvery 2 weeks — betterEvery 24 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhoneiPhone, iPad — better
Requires iOS17.616.6 — better
Further details — not scored
Size12 MB7 MB
Age rating4+4+
DevelopericotAhmad Najeeb

Customer experience

CloudWatcher

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews14 reviews
Positive50.0%
Neutral14.3%
Negative35.7%

GRE Calculator

All ratings374 ratings
Positive86.4%
Neutral5.6%
Negative8.0%
Written reviews99 reviews
Positive80.8%
Neutral7.1%
Negative12.1%

Bugs and requests

CloudWatcher

Not enough reviews yet to summarise bugs or requests.

GRE Calculator

Reported bugs

3 issues
  • Crashes when using certain functions
  • Lag between button press and display
  • Incompatibility with newer iOS versions

Requested features

3 requests
  • Web/computer version
  • Tutorial for advanced functions
  • Ability to use on lock screen

In-app purchases

None

CloudWatcher

No in-app purchases

None

GRE Calculator

No in-app purchases

Questions

Is CloudWatcher free?
CloudWatcher costs $0.99, with no in-app purchases.
Is GRE Calculator free?
GRE Calculator is free to download, with no in-app purchases.
Which has better reviews, CloudWatcher or GRE Calculator?
CloudWatcher is rated higher. CloudWatcher averages 5.0 out of 5 from 1 ratings, while GRE Calculator averages 4.5 from 374 ratings.
Do CloudWatcher or GRE Calculator have ads?
Neither CloudWatcher nor GRE Calculator shows ads.
Which is updated more often, CloudWatcher or GRE Calculator?
CloudWatcher ships an update every 2 weeks, and GRE Calculator every 24 months. Most recently, CloudWatcher was updated on September 20, 2026 and GRE Calculator on July 4, 2026.

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