# Cliff Height Timer — user reviews > 58 indexed App Store user reviews of Cliff Height Timer by Mark Rober, rated 4.61/5 from 178 ratings. - Source: https://appshunter.io/ios/app/cliff-height-timer/id893030245/reviews - App overview in markdown: https://appshunter.io/ios/app/cliff-height-timer/id893030245.md - Rating breakdown: 5★ 153 · 4★ 7 · 3★ 3 · 2★ 3 · 1★ 12 ## Newest reviews (11 of 58) ### 4/5 — Please update *2023-06-12* It’s an amazing app I am sure but it will not work on my iPhone 😑 ### 4/5 — Make it work with iPad os *2021-08-21, version 1.0* I love the channel but can you fix it for iPad os ### 5/5 — Math rocks *2020-10-14, version 1.0* There is only one word to describe this: AWESOME!!! ### 5/5 — Mark rober *2020-10-09, version 1.0* Mark rober I love your channel I love science I hope we can be friends I love physics and engineering like you do and I want to be a nuclear engineer I hope you see this and respond to know that mark rober read this love the app too you are the best youtuber ### 5/5 — Genius *2020-10-02* What a great idea ### 5/5 — Amazing *2020-09-01, version 1.0* Go watch Mark Rober on YouTube ### 5/5 — This is awesome *2020-08-30* This app measured how far the cliff was (off by about a foot) but still quite impressive I couldn’t have thought it would have been that easy thanks and keep it up ### 5/5 — Fantastic! And smart science *2020-08-16, version 1.0* This App is very smart! It uses the Newton’s 2nd Equation of motion. Which is 16 x (Time in the air T To B) power of 2 Which is. FIND out the time it took from top to bottom Then times by the power of 2 and the number u get times by 16 and you will get how much feet. Let’s say it took 5 seconds from falling off a cliff u will times to the power of 2 (5x5=25) Then times it by 16 (16x25=400) so that cliff you just jumped off is about 400 Ft. ### 5/5 — Mark rober is the best *2020-08-11* The application is amazing and very useful! ### 5/5 — It is Really cool *2020-06-30* Vh ### 5/5 — Great *2020-05-23, version 1.0* This app takes all of the math out of figuring out how high a cliff is and it’s accurate. ## Most critical reviews (10 lowest-rated) ### 1/5 — Got message that the app doesn’t work with iOS 16.6 *2023-08-27* And the link for app support takes me to a weird costume website- Clean it up guys, come on Mark, everything else you (guys) are doing is first class! Mike ### 1/5 — No longer usable *2023-02-11, version 1.0* Hasn’t been updated. It’s a shame. Was a nice app ### 1/5 — Needs updated *2022-01-24, version 1.0* I cannot download the app with my newer phone, the app needs updating ### 1/5 — Pls update it *2021-08-24* Can you please update it I think it is a good app but I have not tried it so please update it ### 1/5 — It was a great app, but it doesn’t work on my iPad anymore *2021-05-18, version 1.0* Exactly what the title says😕 ### 2/5 — Needs to be updated *2024-07-17* I am unable to use the app because “The developer of this app needs to update the app for it to be suitable for my phone’s IOS” or something. Very disappointing as I know how great this app is. ### 2/5 — Did I do something wrong? *2016-02-21, version 1.0* I was measuring my guitar from top to bottom and it said 6ft. Did I do something wrong? ### 3/5 — Needs updating *2021-08-28* Love the app but no longer works needs to be updated ### 3/5 — Hobie *2021-07-29, version 1.0* I can’t use it with my phone ### 3/5 — Please update *2021-03-10, version 1.0* Just update the link that used to go to a video but now goes to an advertisement! ## Most praised reviews (10 highest-rated) ### 5/5 — Please update *2024-04-09* I’m trying to download the app but it says the developer needs to update the app to work on my IPhone 11mini even though it should work but it’s still not working. So pretty please update the app. Please? ### 5/5 — Very nice app *2021-11-27, version 1.0* Convenient to estimate height, please update it to work with latest iOS versions ### 5/5 — Not working with iOS15 *2021-10-31* Fantastic app that I have used many times. Since upgrading to a new iPhone13pro phone with iOS15.0.1 the app will not load with the note that the app developer needs to update the app. Mark please upgrade it. Many thanks, keep up your good work. ### 5/5 — Please Update for Your Fans :) *2021-09-15, version 1.0* Hi Mark! Big fan here trying to use Cliff Height Timer on my iPod Touch but the app says the developer needs to make updates. Can you please please?!? Thank you!!! Ryan ### 5/5 — Question *2021-08-11, version 1.0* Any chance this app will be updated for the new IOS operating system? Love using for summer cliff jumping trips. Thanks ### 5/5 — Hi mark rober *2021-05-06, version 1.0* Hi mark rober ### 5/5 — This app is great *2021-02-12, version 1.0* Thanks to mark rober this app works great it can tell how deep something is or how high I am a big fan of his channel. I make music if you want to see go to YouTube djcrain <———— thx ### 5/5 — :D *2021-01-23, version 1.0* Mark Rober is the best, and if he’s reading this, then keep doing what your doing. ### 5/5 — Amazing *2020-12-18, version 1.0* I don’t have much to say just if you get it here are some things to do: 1.drop a rock down a abandoned oil well and see how deep the well is 2.drop a rock of the bridge and see how far down ### 5/5 — Great app *2020-11-05* Great app I like to jump off of stuff thx Mark Rober for making this app --- *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 2026-06-10.*