# iCSC: Clear Sky Chart Viewer — user reviews > 94 indexed App Store user reviews of iCSC by Random Widgets LLC, rated 4.80/5 from 1,548 ratings. - Source: https://appshunter.io/ios/app/icsc-clear-sky-chart-viewer/id877416121/reviews - App overview in markdown: https://appshunter.io/ios/app/icsc-clear-sky-chart-viewer/id877416121.md - Rating breakdown: 5★ 1,374 · 4★ 136 · 3★ 24 · 2★ 3 · 1★ 11 ## What do users think of iCSC? Overall sentiment: positive **Pros** - 🚀 Awesome - 🚀 Great - 🚀 The Best - 🚀 Great Tool - 🚀 Works Great ! - 🚀 Must have for astronomy! - 🚀 Great for everyday use - 🚀 It works and it is easy to use - 🚀 Very Accurate! - 🚀 Indispensabile - 🚀 Basic but Useful - 🚀 Best app for dark sky forecast - 🚀 Fantastic - 🚀 Extremely accurate! - 🚀 Hidden Gem - 🚀 Just as good as the website but easier - 🚀 Excellent!!! - 🚀 Essential astronomy tool! - 🚀 Accurate and easy to use - 🚀 Amazing - 🚀 Nice - 🚀 Best Weather App for Astronomers! - 🚀 A must-have tool - 🚀 Almost perfect - 🚀 Easy to retrieve multiple astro forecasts - 🚀 This new version is better - 🚀 More than just astronomy.. - 🚀 5 star **Cons** - 🐛 Not supported - 🐛 Accuracy - 🐛 no key to charts - 🐛 NO TOO IMPRESSED - 🐛 Terrible. - 🐛 Never Right! - 🐛 Limited scope - 🐛 Pretty Good - 🐛 Good, but glaring issue! - 🐛 Horrible interface to useful data **Commonly reported bugs** - Crashed on opening a favorite, even after your message says bug is fixed. - Latest update crashes on Iphone X - Crashes as soon as I select an observatory/location ever since the update. - Wish they explained what each category meant in terms of overall ability to see the stars. - The data isn't bad, but it is all but unusable on my 5th gen iPad Pro 12.9. Tiny text you can't zoom in on. **Most requested features** - Please add widgets and iPad support - Can update the forecast more frequent, at least once in the afrernoon - Search function - Good app, would love widget ## Newest reviews (12 of 94) ### 4/5 — Used for long time now crashes *2026-08-01, version 1.2.5* iPhone 15 pro max, worked for long time now crashes 1 sec after starting. Reinstalled, no help. ### 4/5 — Great *2025-11-29, version 1.2.5* Nice little app to see the weather forecast for observations ### 3/5 — Not supported *2025-01-03, version 1.2.5* Does kit seem like they support the app anymore. No updates. App did not update the weather this week. ### 4/5 — Love the app, retired stations still listed *2024-10-07, version 1.2.5* I love the CSC and this app. Recently I discovered that stations “retired” from the CSC are still listed and mapped in the app, but the links are dead ends. The OLD Abbey Ridge Observatory (which has moved) and Sheet Harbour. There are be others. The “support” link does not work, hence this review. ### 3/5 — Please add widgets and iPad support *2022-12-03, version 1.2.5* I love the accuracy of the forecast but I really wish there was iPad support and support for Widgets in iOS. ### 2/5 — Not bad, but horrible viewing on iPad *2021-12-02, version 1.2.5* The data isn’t bad, but it is all but unusable on my 5th gen iPad Pro 12.9. Tiny text you can’t zoom in on. MyCSC is a much better choice for iPad users. ### 5/5 — A great, near-term weather app *2021-07-03, version 1.2.5* It’s nice to have access to accurate, near-term weather data when you’re trying to spot distant galaxies or take night photos. This app makes that possible. ### 5/5 — Greater accuracy any weather app. *2021-05-01, version 1.2.5* Amazing accuracy and simple to use. Astronomers best friend. ### 5/5 — Great App *2021-04-26, version 1.2.5* I use this app all the time. Very accurate for my location (US mid-Atlantic coast). ### 5/5 — Simply the best! *2021-02-16, version 1.2.5* Concise amalgamation of data! ### 4/5 — Good. Needs more work. *2020-12-27, version 1.2.5* I’m generally happy with this app, but would like the ability to enter GPS coords for favorites. “Nearest neighbor” doesn’t work when that closest info point is over 100 miles away. ### 5/5 — Handy tool *2020-09-30, version 1.2.5* Lots of “seeing” information and forecasts at my fingertips. Helps me plan for an evening under the stars with my telescopes. ## Most critical reviews (10 lowest-rated) ### 1/5 — Not supported *2025-09-26, version 1.2.5* Does kit seem like they support the app anymore. No updates. App did not update the weather this week. ### 1/5 — The world isn’t just North America *2025-08-17, version 1.2.5* Would have been nice to get a chart for Puerto Rico. ### 1/5 — Search is useless, missing many locations *2024-04-02, version 1.2.5* I had a 10 year old clear sky clocks program that no longer worked when I updated to new phone and latest OS. It easily found locations near me This app only finds a limited number of the Clear Sky Sites available on the website, and you have to know the EXACT naming and wording of the entire clock title. Clear sky locations I’ve used for decades aren’t in this app’s list. Useless, wish I could give it Zero stars. ### 1/5 — no key to charts *2023-08-18, version 1.2.5* it may be accurate, but with no key to the charts, who knows what color is what. If you're new to Astronomy, it's pretty much useless. ### 1/5 — NO TOO IMPRESSED *2023-01-30, version 1.2.5* This version for my iPhone doesn’t allow me to pick/select favorite locations. In fairness the version I have on my Mac works fine. ### 1/5 — Terrible. *2021-05-26, version 1.2.5* Wow. Looks cool. It’s total cloud cover and raining. The app shows it’s clear and dark. App says I should be outside in the rain with my telescope. Hahahaha. What a joke. ### 1/5 — Never Right! *2021-05-12, version 1.2.5* Perhaps just for our area, but the results / forecasts are always wrong. No way to let developer of the problem real time. ### 1/5 — Limited scope *2019-11-03* This app has a lot of potential but bizarrely it only works in North American locations. What is wrong with allowing GPS or lat/long location specification rather than just having a fixed list of locations? ### 1/5 — Horrible interface to useful data *2015-05-17, version 1.1* App is extremely out of date. Does not respond well to new phones general lack of pride in the presentation of the material. ### 2/5 — Accuracy *2025-05-17, version 1.2.5* Cloud cover about 50% yet says clear Wagoner, OK ## Most praised reviews (10 highest-rated) ### 5/5 — Awesome *2026-01-05, version 1.2.5* Totally awesome ### 5/5 — The Best *2025-09-25, version 1.2.5* Hands down the best forecast for astronomy…ever ### 5/5 — Great Tool *2025-08-06, version 1.2.5* Great tool. I’m a novice at astrophotography so this app / website is essential. And it is great. ### 5/5 — Works Great ! *2025-05-22, version 1.2.5* I’ve been a Clear Sky user for several years - much more reliable than any other tool I’ve used for astronomical forecasting ### 5/5 — Must have for astronomy! *2024-07-25, version 1.2.5* We have used CSC for over 20 years, and it has been consistently the most accurate forecast out there! Updates occur daily, and sometimes, seems to be more frequent than that. Seldom if ever significantly wrong, and if you want your own map, it is a simple process of uploading your coordinates. My go to whenever considering observing. ### 5/5 — Great for everyday use *2024-04-05, version 1.2.5* The only thing that has ever “fooled” this app in my experience is marine layers by the coast (Seattle, Oregon coast, BC). Otherwise, amazing tool, super accurate and easy to use once you get the hang of the charts and legend. Highly recommended ### 5/5 — It works and it is easy to use *2023-05-21, version 1.2.5* Easy to understand and use - nicely functional app! ### 5/5 — ABSOLUTE NECESSITY FOR ASTRONOMY *2022-11-28, version 1.2.5* This is my first, and often only, go-to for astronomical seeing details. It’s fundamentally necessary. ### 5/5 — Clear Sky Chart *2022-08-27, version 1.2.5* Simple and useful. ### 5/5 — Awesome *2022-08-21, version 1.2.5* This is great weather guide fo clear skies. It is my go to app for star gazing. Very accurate. Highly recommended! --- *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 2026-09-09.*