# App that measures pixels for cda Calcs

**URL:** <https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500>\
**Category:** Uncategorized\
**Tags:** podcast, aerodynamics\
**Created:** [June 26, 2019, 5:45am UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500 "2019-06-26T05:45:52Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![dpenfold](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/dpenfold/32/11559_2.png) [@dpenfold](https://www.trainerroad.com/forum/u/dpenfold)\
**Post date:** [June 26, 2019, 5:45am UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500/1 "2019-06-26T05:45:52Z")

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Hi team. There was an app mentioned on the podcast that can help estimate cda. I think it was Jonathon who talked through the process. You take a photo, it scrubs the background leaving the rider and bike then does the calculations. Does anyone recall the name of the app?

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**Author:** ![cartsman](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/cartsman/32/18565_2.png) [@cartsman](https://www.trainerroad.com/forum/u/cartsman)\
**Post date:** [June 26, 2019, 7:14am UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500/2 "2019-06-26T07:14:52Z")

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Bioracer Virtual Wind Tunnel?

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**Author:** ![dpenfold](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/dpenfold/32/11559_2.png) [@dpenfold](https://www.trainerroad.com/forum/u/dpenfold)\
**Post date:** [June 26, 2019, 8:28am UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500/3 "2019-06-26T08:28:17Z")

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Thanks Cartsman. That app looks interesting but that’s not it. Looks perfect for watching how your knees/hips track while pedalling though.

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**Author:** ![AdamJ](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/adamj/32/15695_2.png) [@AdamJ](https://www.trainerroad.com/forum/u/AdamJ)\
**Post date:** [January 19, 2022, 11:21am UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500/4 "2022-01-19T11:21:34Z")

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Any update on this? Wondering the same question after seeing a screenshot somewhere

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**Author:** ![olivier\_demichel](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/olivier_demichel/32/172633_2.png) [@olivier\_demichel](https://www.trainerroad.com/forum/u/olivier_demichel)\
**Post date:** [February 28, 2026, 1:17pm UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500/5 "2026-02-28T13:17:32Z")

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Here, is something similar.. but for real time apparently..

> **[AeroX — Indoor cycling with real-time aerodynamics](https://aeroxbefaster.com/en/)**
>
> AeroX turns your smart trainer into a wind tunnel: measure your position with just a webcam, gain 2–3 km/h and save 40 W. Built for demanding cyclists and triathletes, progress beyond Zwift, MyWhoosh and Kinomap.

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**Author:** ![Sten](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/sten/32/7757_2.png) [@Sten](https://www.trainerroad.com/forum/u/Sten)\
**Post date:** [February 28, 2026, 1:25pm UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500/6 "2026-02-28T13:25:30Z")

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Has anyone tried it? Will it make me faster?

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**Author:** ![olivier\_demichel](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/olivier_demichel/32/172633_2.png) [@olivier\_demichel](https://www.trainerroad.com/forum/u/olivier_demichel)\
**Post date:** [February 28, 2026, 3:57pm UTC](https://www.trainerroad.com/forum/t/app-that-measures-pixels-for-cda-calcs/17500/7 "2026-02-28T15:57:22Z")

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apparently, it helps knowing your cad in live, but this makes you faster only if you want to change it by changing your position 😉 you will make you faster..