u/Anton_OneMoreShelf

What’s the best Tamiya model you’ve ever built? Looking for recommendations for my next project!

If you could only pick one Tamiya kit for someone starting the hobby—or one that every collector should build at least once—which would it be?
I’m always looking for great additions to my collection, so I’d love to hear your favorites and why they’re worth building.

Disclosure up front: this is my own app.*

I'm here to share the build and the bugs that hurt, not to sell anything — the store link is at the very bottom for anyoHey! I'd like to share an app I built called KitSort (https://apps.apple.com/app/id6760932584). It catalogs hobby collections — model kits, LEGO, Hot Wheels, Warhammer. You point your camera at the box, on-device OCR plus an LLM fill in the make, scale, year and category, and you get a finished entry in about a second. No spreadsheets, no typing.

Tech Stack

• Flutter + Dart (Clean Architecture / BLoC), shipped to the App Store with RevenueCat for StoreKit subscriptions.
• Supabase + PowerSync for an offline-first local SQLite store that syncs in the background, so it works with no signal.
• ML Kit for on-device OCR, then Gemini behind a Supabase Edge Function so the API key never ships in the app.

Development Challenge

The worst bug was email signup silently failing on iOS, and quietly costing me paying customers.

The confirmation email used a kitsort://login deep link, but iOS users who open mail inside Gmail's in-app browser land in a webview where the PKCE handoff never completes, so the link just dead-ends. On top of that, signup created a fresh user and orphaned the anonymous account they'd been using, killing the RevenueCat trial tied to it.

How I solved it: I dropped the deep link and switched to an in-app 6-digit OTP. On signup I call Supabase updateUser(email) (which keeps the anonymous UID), the user types the code, and verifyOTP(.emailChange) upgrades the session on-device — no browser handoff. Since the UID is preserved and my RevenueCat App User ID is that UID, the subscription survives signup. (Gotcha: the Supabase "Change email address" template has to send {{ .Token }}, not {{ .ConfirmationURL }}.)

🤖 AI Disclosure

This app is mostly AI-generated. I drove the architecture, reviewed everything, and made the product and debugging calls (like the OTP fix above).

Would love feedback on the scan flow's speed, and happy to go deep on the PowerSync/Supabase offline setup or the RevenueCat side. Thanks for checking it out!

Some builds look simple at first, but end up taking hours and testing your patience. Others are surprisingly relaxing and fun.
Which LEGO set caught you off guard, and was it worth it? 👇

Which one was it, and would you build it again? 👀

Mine was definitely harder than expected. 😅
What’s the most challenging Tamiya kit you’ve built? Would you build it again? 👀

Funny how most collections started with just one box. 😅 What got you into the hobby?

I’d go with the Eiffel Tower. It’s an incredible display piece and one of the most impressive LEGO sets ever made.

After reading the comments, I realized my biggest problem wasn’t finding cars — it was remembering what I already own
I kept buying duplicates, forgetting castings I already had, and wasting time checking shelves at home.
So I started using KitSort to keep track of my collection.
Now before I buy anything, I do a quick check:
✔️ Do I already have it?
✔️ Is it a variation I want?
✔️ Does it fit my collection goals?
It’s made collecting a lot more enjoyable and a lot less chaotic.
Curious — what system do you use to keep track of your collectio

Even if it’s just a regular toy car, it still looks legendary 🔥

70 years later and this thing still looks futuristic 😮‍💨🏎️
One of the oldest models in my collection.

The color looks absolutely insane in person. Definitely one of my favorite Technic models so far. Worth every hour of building
Lamborghini Sián FKP 37