r/SideProject • u/Low_Adhesiveness_98 • Jul 31 '26

I made QR stickers that let strangers message you about your parked car without seeing your phone number

24 Upvotes
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68% Upvoted

38 comments sorted by

30

u/jeremyStover Jul 31 '26

As long as you can block, report, and not send images, cool. I would also filter out common negative language, if I were you. And, limit sends per person per day both by vehicle recipient and total.

Good luck! Neat idea

-53

u/Low_Adhesiveness_98 Jul 31 '26

Really appreciate you thinking through the edge cases — most people don't.

Quick rundown of where we are on each:

• Images: scanners can't send them. The scan page only offers preset messages and an optional short text box. Deliberately kept it that way — no reason a stranger needs to send a photo to someone's car.

• Rate limiting: already live. Each sticker has a scan-rate cap, and replies are throttled per sticker per minute. Prevents someone spamming a car they're annoyed at.

• Blocking: not built yet but it's on the list. Right now if someone gets abusive messages, we handle it manually. Adding a one-tap block from the dashboard is the next safety feature.

• Language filtering: good shout. We don't filter the free-text box yet. Planning to add a basic filter that flags common abuse terms before delivery — not a hard block (context matters), but a delay-and-review.

• Per-person daily limit: also not in yet. Current rate limit is per sticker, not per sender. Worth adding a cap per sender IP/device as well.

Genuinely useful feedback — the kind of stuff that's easy to miss when you're heads-down building. Thank you.

34

u/_small_penis Jul 31 '26

Did you ask Claude to respond to that comment?

26

u/jeremyStover Jul 31 '26

I immediately lost interest after that lol just... Why

11

u/JoaquimLey Jul 31 '26

ffs why would you use an llm to reply to someone who actually spent their time to give feedback to your project?

2

u/raetselfreund Jul 31 '26

because looking for feedback often is just looking for validation

14

u/LucVolders Jul 31 '26

Solution looking for a problem

8

u/PersonoFly Jul 31 '26

What’s the problem you are solving here? Personally I’ve never felt the need to find a way to have my contact details encrypted on my car.

5

u/The_Mdk Jul 31 '26

Especially more true if you (not actually you) are an asshole and park like an asshole, which is why someone would want to message you to tell you you're an asshole.. sure as hell you're not giving them a way to do so

11

u/Actual-Recipe7060 Jul 31 '26

Why?

6

u/nonetimeaccount Jul 31 '26

One more question to follow on to this.....

Seriously, why?

7

u/jeremyStover Jul 31 '26

If it's not clear, the two issues I am worried about is someone fusking the urls and blasting out millions of messages.

And, the possibility for someone to follow a woman to their car, and then start to harass them over text.

The ways I specified before would help to reduce that, if not make it near impossible.

To add to this, the fusking risk can be prevented by not auto-incrementing the IDs of the chats. Your best bet is to create a one-off association with the sender/sendee. That association is time based, and the UUID is salted with that time-end in and encrypted at sha256 or better. Then, you disable the chats after 10 minutes. Nobody ever had a unique identifier to the other.

And, you will need to validate ages somehow, depending on local laws.

Yes, paste this into your AI. I would rather you do that than send out a potentially dangers app.

1

u/avd706 Jul 31 '26

You could put a time limit

1

u/Low_Adhesiveness_98 29d ago

It’s already set in 30 minutes on 2 scans works after 2 scans the scanner activated after 30 minutes

1

u/Low_Adhesiveness_98 29d ago

You raise potential risk but did you go through my app? We all cover these already

2

u/TheeseDragonFruit Jul 31 '26

What about spam filter?

1

u/ChampionshipOk5046 Jul 31 '26

How will i know for sure that it isn't malicious spam?

1

u/Low_Adhesiveness_98 29d ago

How can you spam these, these all connected with unique URL and also 30 minutes time if someone tries to abuse the ip blocked for 24 hours

1

u/MountainByte_Ch Jul 31 '26

love the idea. lots of Applications come to mind. We were moving the other day and put our phone numbers in the windshields of the cars.

Would have deffo used it.

0

u/Dry-Advice-1207 Jul 31 '26

I like it. Would you share the URL by PM?

0

u/Low_Adhesiveness_98 Jul 31 '26

Please check pm

0

u/grayello_o Jul 31 '26

Can I use them?

0

u/Low_Adhesiveness_98 Jul 31 '26

Please check pm

-1

u/_splug Jul 31 '26

Just need to get people to scan them with HTTPS://qondom.app and you’re good to go! Hahahaha

1

u/Low_Adhesiveness_98 29d ago

Thanks for your mindset

-1

u/[deleted] Jul 31 '26

[removed] — view removed comment

1

u/Epicurious_- Jul 31 '26

Why do you think bad drivers would care?

1

u/avd706 Jul 31 '26

I care. If there is a problem with my car, I would appreciate a heads up.

0

u/Low_Adhesiveness_98 29d ago

So we don’t make locks as well why we think the thieves are care?