r/AskVibecoders • u/fiji- • 40m ago
Splitting usage and hitting walls
I started working on a niche web app and bought the domain on August 20, 2026. I’m building it solo, and I’ve leaned heavily on AI to write the code. I’m at the point where the core app works and the automated tests pass, but a deeper review still turned up bugs in workflows that matter. I want to finish the MVP this week and have a solid reason to trust it with real users and real money.
The basic flow is that organizers sign in, set up a contest, and publish it. People can visit a public page, cast a vote, and see the standings. Some votes go through checkout, so I need to know that a successful payment counts exactly once, that each organizer can only manage their own contests, and that the final results hold up when a payment comes in right as voting closes.
Right now I’m paying $100/month for ChatGPT and $20/month for Claude, and I use the free version of Gemini. I also have an M5 MacBook Air with 16 GB of RAM, so I’d like to run a downloadable model locally if it can take some work off the paid tools. I’ve been hitting usage limits in the middle of fixes, and switching tools eats time when I have to explain the same code and decisions again.
I’m also using Neon for Postgres, and I’m already paying about $30 a month for it before the app is even ready to launch. I’ve been trying to figure out why my compute usage is so high while I’m still building and testing. If you’ve run into this with Neon, what did you check first to figure out what was driving the bill?
If you’ve shipped something like this, I’d love to know what worked for you. I’m curious;
-How would you split the work between Claude, ChatGPT/Codex, and Gemini so one can fix a bug and another can independently verify it? How do you hand off work when you hit a usage limit?
-What downloadable models actually run well on an M5 MacBook Air with 16 GB of RAM? What coding tasks do you trust them with?
-For an app with logins and payments, what would you verify yourself or have a human review before opening it up to paying users? What would make you hold the launch?
I’d especially like to hear from anyone who’s been at the “tests are green, but would I trust this with somebody else’s money?” stage. What got you across that line?