SECTION 01 / HOME
OneWin
One Build
The project log for a car build. Every part, hour and horsepower — accounted for.
OneWin - One Build is the project log for a car build — the weekend restoration in a home garage, the track car that grows one modification at a time, the engine swap that has been "nearly done" for a year. It tracks which parts are on the wishlist, ordered, late or fitted, how many hours went into each job, how much of the budget is spent, committed or free, and what every gain on the dyno cost.
What you get
Project desk
The car, the goal, an exploded drawing by node, budget, progress and what is next.
Parts
Part number, vendor, price and shipping — wishlist to fitted, with late-delivery warnings.
Jobs
Hours, cost and who did the work.
Bench
Before and after power, torque, weight, 0-100 and more — with the cost of each unit of gain.
Spend
Spending by node and by month.
Build story
A timeline of the whole build.
Example build
A finished sample project to look around first.
No account, no cloud
Everything stays on your phone.
Screens
SECTION 02 / PRIVACY
Privacy Policy
Last updated: October 9, 2026
- 01
No account
OneWin - One Build works without an account, without registration and without any sign-in.
- 02
No personal data collected
The app does not collect, transmit or sell personal information.
- 03
Your data stays on your device
The projects you set up with their car details, goals, budgets and dates, the parts with part numbers, vendors, prices and delivery dates, the jobs with hours and costs, the measurements you record and every figure calculated from them are stored only in the local storage of your device and are never uploaded to any server. Names of shops and vendors that you type stay on the device.
- 04
Camera and photos
The camera and photo library are accessed only when you choose to add a photo to a project, and that photo stays on the device.
- 05
Fully offline
The app makes no network requests and every feature works fully offline.
- 06
Figures are not advice
The cost and gain figures are arithmetic on what you entered, not advice on how to modify a vehicle.
- 07
No notifications
The app sends no push notifications and does not ask for notification permission.
- 08
No ads, analytics or tracking
There is no advertising, no third-party analytics and no tracking.
- 09
Other permissions
The app does not use your location, contacts or microphone.
- 10
No betting, no purchases
The app contains no betting of any kind, nothing is sold or transacted inside the app and there are no in-app purchases.
- 11
Independence
The app is independent and is not affiliated with, endorsed by or connected to any car maker, parts vendor or workshop.
- 12
Children
The app is not directed to children under 13.
- 13
Deleting your data
Deleting the app erases all projects, parts, jobs, measurements and photos permanently.
- 14
Changes to this policy
If this policy changes, the updated version will be published on this page.
- 15
Questions
Questions can be sent to benoit@collard.buzz.