# RollBy Speedometer > Model train speedometer and odometer using Bluetooth-enabled hardware. (iPhone/iPad app by Boulder Creek Engineering, LLC.) - Source: https://appshunter.io/ios/app/rollby-speedometer/id1272234459 (this page in markdown: same URL + `.md`) - Developer: [Boulder Creek Engineering, LLC](https://appshunter.io/developer/1272234458) - Category: Utilities - Price: Free - Rating: 4.40/5 from 7 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 13 MB - Languages: American English - Released: 2017-09-11 - Data updated: 2026-07-22 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/rollby-speedometer/id1272234459/reviews.md ## What is RollBy Speedometer? RollBy Train Speedometer is a free (and ad-free) speedometer and odometer for model trains on your iPhone or iPad. Requires a RollBy OnBoard Speedometer for each train, available from Boulder Creek Engineering (www.bouldercreekengineering.com). Now you can see how fast your model train is traveling and how far it has gone. Measure the distance between towns, or the length of your sidings and yard tracks. • Receives speed and distance with Bluetooth Low Energy (BLE) radio • Continuously measures speed and distance while train is in motion • Tracks more than one RollBy OnBoard Speedometer at the same time • Measures Real and Scale Distance on your layout • Displays elapsed Running Time • Speed and Distance displayed in English (MPH, feet, miles) or Metric (KPH, meters, km) • Requires iOS version 9.0 or greater with BLE capability ## Key features - Bluetooth speed and distance reception - Continuous measurement - Multiple train tracking - Real and scale distance measurement - Elapsed running time display - English and Metric unit options ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/rollby-speedometer/id1272234459/reviews.md ### 1/5 — No speedometer *2021-05-23, version 1.1.1* Can’t get the app to do anything. It says my phone is ready. Can’t even get the demo to work. ### 5/5 — Nice tool *2018-05-14, version 1.1.1* Allows accurate display of speed and distance to scale. I used primarily to speed match my DCC locos so I could run them together in a consist without problems. Only issue I had was that the magnet on the axle used to count rotations was so strong it was disrupted by any steel in the track like track nails thus messing up speed calculations. I made a test track without steel nails to do my initial testing then I pulled all the steel nails from my layout and replaced them with brass pins. Problem solved. ### 5/5 — Easy installation. Dead simple setup. Accurate results. *2017-09-14, version 1.1.1* Installation of the associated sensor took a bit of modification on my N scale box car, but was easy and came together quickly. Setting up the speedometer in the free iOS app was simple as could be. If only my smart home devices could pair this easily! I am just getting started in the hobby, so the speedometer isn't as necessary as for some of the folks with large layouts and multiple operators, but the speed and distance features really add that extra layer of realism, and really gets me excited to continue to expand my rail lines! Thanks Boulder Creek Engineering—keep up the awesome work! ### 5/5 — Real Data in Real Time! *2017-09-13, version 1.1.1* This on-board model train speedometer provide accurate scale speed and distance information. Not need for speed tunnels or other fixed location speed measurement devices. The hardware is simple to install in a suitable piece of rolling stock and after setting scale and wheel diameter, the app is ready to use. As your train moves, the speed and distance data is sent to your app and updated continuously. No more guessing how fast your train is moving or how far you have gone. ## Frequently asked questions about RollBy Speedometer ### What is RollBy Speedometer? RollBy Speedometer is a free, ad-free application for iPhone and iPad that functions as a speedometer and odometer for model trains. It requires a separate RollBy OnBoard Speedometer hardware unit for each train. ### How does RollBy Speedometer work? The app receives speed and distance data from the RollBy OnBoard Speedometer hardware via Bluetooth Low Energy (BLE) radio. It then displays this information continuously while the train is in motion. ### Can RollBy Speedometer track multiple trains? Yes, the application is capable of tracking more than one RollBy OnBoard Speedometer simultaneously, allowing you to monitor several trains at once. ### What units does RollBy Speedometer display? RollBy Speedometer can display speed and distance in both English units (MPH, feet, miles) and Metric units (KPH, meters, km), catering to user preference. ### What are the system requirements for RollBy Speedometer? RollBy Speedometer requires iOS version 9.0 or greater and a device with Bluetooth Low Energy (BLE) capability, such as an iPhone or iPad. ### Is RollBy Speedometer free to use? Yes, RollBy Speedometer is available for free and does not contain advertisements. The primary cost is associated with the required RollBy OnBoard Speedometer hardware. ### How often is RollBy Speedometer updated? The latest version of RollBy Speedometer is 1.1.1, which was released on September 11, 2017. As of the last update, there have been no subsequent version releases. ### What is the age rating for RollBy Speedometer? RollBy Speedometer has an age rating of 4+, making it suitable for users of all ages. It is designed for a specific hobbyist audience. ## Version history (last 1 release) ### 1.1.1 — 2017-09-11 This app has been updated by Apple to display the Apple Watch app icon. ## Apps similar to RollBy Speedometer | App | Rating | Price | Category | | --- | --- | --- | --- | | [NanoStopWatch byNSDev](https://appshunter.io/ios/app/nanostopwatch-bynsdev/id6748882505) | — | Free | Utilities | | [Backblaze B2 Explorer](https://appshunter.io/ios/app/backblaze-b2-explorer/id1447255895) | 2.7 (3) | $7.99 | Utilities | | [ThrottleCard](https://appshunter.io/ios/app/throttlecard/id6739982126) | 4.3 (11) | Free | Utilities | | [Trainventory](https://appshunter.io/ios/app/trainventory/id6738597502) | 5.0 (6) | Free | Utilities | | [TrainNavigator](https://appshunter.io/ios/app/trainnavigator/id6738654983) | — | Free | Utilities | | [Smart Flow Meter](https://appshunter.io/ios/app/smart-flow-meter/id6470349170) | — | Free | Utilities | --- *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 2026-07-22.*