# Gear Speed - Brushless RC Speed Calculator — user reviews > 57 indexed App Store user reviews of Gear Speed by Ultra Software Solutions, LLC, rated 3.80/5 from 120 ratings. - Source: https://appshunter.io/ios/app/gear-speed-brushless-rc-speed-calculator/id898565895/reviews - App overview in markdown: https://appshunter.io/ios/app/gear-speed-brushless-rc-speed-calculator/id898565895.md - Rating breakdown: 5★ 60 · 4★ 25 · 3★ 10 · 2★ 2 · 1★ 23 ## What do users think of Gear Speed? Overall sentiment: negative **Pros** - 👍 Easy to use interface - 👍 Good for RC gearing calculations - 👍 Provides a good idea of relative speed - 👍 Useful for trackside decisions - 👍 Accurate for many users - 👍 Saves multiple setups - 👍 Good for "what if" analysis **Cons** - 🐛 App crashes on startup - 🐛 App reverts to home screen - 🐛 Not working on newer iPhones - 🐛 Cannot add new setups - 🐛 Data sometimes resets - 🐛 Waste of money for some - 🐛 Incorrect or inaccurate calculations - 🐛 Lacks advanced features - 🐛 Basic functionality - 🐛 Not worth the cost for some **Commonly reported bugs** - App reverts to home screen on launch - App does not work on iPhone 15 - App is stuck and cannot add new setups - App not working for some users - App kicks users out - App opens to a blank screen with a '+' sign, then returns to the phone screen - App disappears after selecting '+' - App shuts down after tapping the '+' sign - Data sometimes resets, requiring re-input - App used to work but is no longer functioning - Calculations are wildly inaccurate (e.g., 3467MPH, 3mph) - App does not have values for differentials - App tells users their car will only do 3 mph - App hasn't worked right for a day - App doesn't allow input for crown gear and pinion - App doesn't allow selection of gear type (48pitch or mod 1) - App is roughly 20 mph off compared to GPS measurements - App doesn't calculate correctly - App sometimes doesn't save information - App doesn't go to 34 volts - App shows crazy mph even with correct input **Most requested features** - Add KV and equivalent gear comparison for different pitch sizes (48p, 32p/0.8mod, mod1) - Include different gear pitch types (e.g., 32p, 48p, mod 1) - Allow reorganization of lists for grouping models - Implement a master car list with sub-lists for gear, tire, and battery options - Lower battery voltage values for drag racing calculations (e.g., 6-7v) - Allow selection of higher battery voltages (up to 16s) - Add options for 4-wheel drive calculations - Include differential gear ratios - Allow input for multiple gears in a car - Add ability to input crown gear and pinion - Allow selection of gear pitch type (48pitch, mod 1) - Add air resistance and vehicle dimensions - Allow input for KV less than 500 (e.g., 190kv motor) - Increase maximum V/Cell beyond 4.30 - Add differential gear ratio input - Allow input for crown gear and pinion - Allow selection of gear pitch type (48pitch, mod 1) - Add air resistance and vehicle dimensions - Allow input for KV less than 500 (e.g., 190kv motor) - Increase maximum V/Cell beyond 4.30 ## Newest reviews (14 of 57) ### 4/5 — Suggestion *2024-10-05* Only thing this app needs is a kv and equivalent gear comparison between 48p,32p/ 0.8mod and mod1 ### 2/5 — RK *2024-09-10, version 2.1.0* Not worth the 99 cents. There are ones on line that are better for free. ### 3/5 — Eh *2024-06-16* Useful but lately sometimes my days saves sometimes it resets and I have to input the data again! ### 1/5 — Every time *2024-01-18* As soon as I tap the plus sign the app shuts down! ### 1/5 — Not impressed *2023-04-22, version 2.1.0* Doesn’t do anything. Can’t believe I wasted a whole dollar on this. ### 1/5 — Wrong info *2022-10-08* It used to give me pretty accurate info. Now, with that same info it predicts my RC will go 3467MPH? Created new sheet and still show same. Please correct if your going to charge for this app. ### 3/5 — 32p and 48p is different *2022-05-27, version 2.1.0* This app should have different gear pitch types ### 4/5 — Good tool, could use an update *2022-05-24* Good tool but lacking some basic things that would take it from good to great. There’s no way to reorganize your list, which would be really nice to group models together with different gear and tire setups. I’d really love to see a master car list with a sub-list of available gear, tire, and battery options. As a quick and dirty tool, this gets it done. ### 4/5 — More voltage please! *2022-01-11* Love the app, but being able to select up to 16s would be great. Please ### 1/5 — Basic.. if you have 4x4 your out of luck *2021-11-04* Very few options . This would be okay if you was trying to get the general idea on how fast your setup is. But nothing 4 wheel drive . Nothing for the front and rear differential gears radios nothing if for car has Multiple gears. Just basic and waste of a dollar. So now I have keep it cause spend money on it . So it going as back ground on my phone so I would have to Search to use it cause that’s how useless this app is . ### 4/5 — Very useful *2021-08-16* Very useful but could be a little better. Using this for drag racing I am pulling down to 3.4 per cell and I can’t duplicate that. ### 4/5 — Why all the bad reviews? *2021-07-21, version 2.1.0* App works great for me. Arrma 6s Talion running 8s on GRP’s and castle MMX8s/ 1717-1650kv. I don’t know how the app looked before the last update but everything is there to calculate speed (theoretical). That’s the only problem. According to Raz Shiffran you should input 1 cell less that whatever you’re running. Also, drop your cell voltage to around 3.75v per cell if you want a realistic number. Also, make sure when entering in your tire size that you know which unit of measure you’re using. I’m pretty sure that’s what one reviewer did wrong. He said it calculated his rig could only achieve 3mph. Probably entered his tire size in inches when he was using the millimeter unit of measurement. Imagine a 4mm tall tire, LOL! App does what it says. Wish you could enter in air resistance and maybe the dimensions of vehicle. ### 3/5 — I guess it works kind of *2021-04-08* It doesn’t state what size can the motor is or what type of pitch the gears have and there is no way to change it. It doesn’t even say what the can size is that the entire app is based off of. If they would fix this it might be worth something but I guess.? ### 1/5 — Wow... *2020-11-28, version 2.1.0* I was expecting something nice since I was paying for it don’t even have values for differentials like what? Terrible App wasted a dollar better off using the free ones on google ## Most critical reviews (10 lowest-rated) ### 1/5 — Broken *2026-03-23, version 2.1.0* This app cost .99 and does nothing but revert back to my Home Screen when trying to use it ### 1/5 — It doesn't work on my iPhone 15. I don't recommend this program. *2026-01-06, version 2.1.0* It doesn't work on my iPhone 15. I don't recommend this program. ### 1/5 — It’s stuck *2026-01-03, version 2.1.0* Cannot add new set up ### 1/5 — Not working *2025-11-26, version 2.1.0* Not working ### 1/5 — App kicks me out for some reason *2025-04-16, version 2.1.0* Waste of money ### 1/5 — I have problem *2025-03-23, version 2.1.0* Not that bad ### 1/5 — Not working *2024-05-22, version 2.1.0* It used to work back then now its not ### 1/5 — Not working *2024-05-11* Every time I click on app it open to a blank screen with an + sign and I click it ,it goes back to my phone screen ### 1/5 — Don’t work *2024-04-11* Can’t even use the app when I download the app ??? ### 1/5 — Never worked at all *2024-02-03, version 2.1.0* The app comes up Then I choose the + And the app disappears Just like my dollar ## Most praised reviews (10 highest-rated) ### 5/5 — Good! *2023-05-21* I use it for Scalextric cars with brushed motors, just set kv to about 1000 and increase cell count until you reach your max motor rpm…fine tweak by adjusting cell voltage. But remember it’s only an indicator, weight and drag (although negligible at this scale) will have an impact on final speed. ### 5/5 — the best for speed runners in the rc world *2023-03-01* It’s just the best app you can possibly get to do your gearing for rc cars and you won’t find a more accurate app out there anywhere i’ve looked it’s worth the money ### 5/5 — Rc *2022-10-07, version 2.1.0* Cool app definitely helps alot ### 5/5 — Great app *2022-04-20* Drag racing guys need lower value of battery power to calculate speed 6-7v realistically ### 5/5 — Great tool *2022-01-05* Excellent tool for the RC enthusiast. Only downside to using the GEAR SPEED app is that it can be pretty addicting. ### 5/5 — Great app. *2021-01-12, version 2.1.0* Love the app.👍🏾 ### 5/5 — Perfect *2020-11-15, version 2.1.0* Works as intended!! ### 5/5 — Gears *2020-06-09* Great apps definitely takes the guess work out of things👍🏾👍🏾👍🏾👍🏾👍🏾🦾 ### 5/5 — Great app *2020-01-18* I love that I can save multiple setups and add notes to each setup. Worth all 99 pennies ### 5/5 — Works Great For Me! *2018-01-12, version 2.1.0* I’m new to 12th scale and this app works just fine --- *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 2026-08-25.*