Your build,obsessivelydocumented.
Upload three photos. AI identifies your car and every modification it can see. Service schedules that adapt to how you actually drive.
Type your car. We'll tell you if our AI is tuned for it.
Right now we cover four cars in full: the Golf GTI, Golf R, Audi S3 and Audi RS3. Every interval, every part and every spec is dialed in. More models are coming. Tell us what you drive and we'll let you know when it's supported.
Every part.
Every cost.
Every receipt.
Photograph the build once. We extract a structured record. VIN-matched, part-numbered, dated and verified. Drop a service receipt in and it joins the same dossier automatically.
Built for the people
who obsess.
Everything about your build in one place, from the first bolt-on to the day you sell. Six tools doing the work of six different apps.
Three photos in. A complete build sheet out.
Trained on 40,000 MQB chassis vehicles. Recognizes 1,800+ aftermarket parts by silhouette, badge, and texture.
Schedules that adapt to your build.
Stage 2 doesn't keep stock intervals. Neither do we.
Photograph it. We file it.
One link.
Buyers trust it.
Anonymous.
Until you say.
Three steps.
That's all.
Designed so you can document a full build during a coffee break, and have it grow with you for years after.
Upload your photos
Exterior, engine bay, interior. Takes under a minute. We accept HEIC, JPEG, RAW.
↗AI does the work
Identifies your car, color, every modification it can see. You just confirm.
↗Your build lives here
Complete verified profile. Service intelligence. One link to share when you sell.
↗A car is a record of decisions. Every receipt, every torque value, every spec sheet: proof of the work, and the only thing standing between you and a low-ball offer when it's time to sell.
Rennen exists because we got tired of forum posts as memory, glove-box receipts as documentation, and “trust me” as resale strategy. We're building the system we always wished existed, for people who actually care about their cars.
MK7 GTI · Owner-documentedPick the plan that fits your build.
Free forever for one vehicle. Pay only when you need more. Switch or cancel any time. Your data is always yours. Plans open at launch. Join the waitlist to be first in.
- Cars in your garage: 1
- Add your car from photos
- Mods logged: Unlimited
- Care and service notes for each mod
- + 6 more, see full specs
- Cars in your garage: Up to 3
- Service history entries: Unlimited
- Service schedule adjusted for your mods
- Service reminders
- + 11 more, see full specs
- Cars in your garage: Unlimited
- Part breakdown for every wishlist part
- Receipt scanning
- Carfax and service history import
- + 15 more, see full specs
Build a profile
buyers will believe.
Document your build, track every service, and carry a verified record straight to resale.
Opening soon · Early access list open