u/APIBResearch

Hello all,

My name is Blake and I launched RubricAI today, it takes your work and grades it on a scale providing valuable insight on how to improve your work and I highly recommend it.

Quick story for anyone stuck on "I want to build but my Anthropic/OpenAI bill would eat me alive before I get a customer."

I'm a solo builder. I shipped RubricAI (AI essay grading for AP/IB teachers) without a direct API key to any frontier model. I built it on top of a builder platform that bundles the AI in. Zero per-token bill landing in my inbox.

Why this matters more than people admit on this sub:

- Pre-revenue, your enemy is not competition. It's your runway. Every dollar that goes to inference before you have paying users is a dollar you can't spend on the one thing that actually matters: finding out if anyone wants this.

- You do not need the best model. You need a model good enough that your first ten customers say yes. Teachers grading a TOK essay cannot tell the difference between a top-tier and a mid-tier model. They can absolutely tell the difference between "this saved me 4 hours" and "this didn't."

- Builder platforms in 2026 are genuinely good. Two years ago I'd have laughed. Now the gap between "rolled my own stack" and "shipped on a builder" is mostly ego.

- The day the unit economics actually justify swapping to a direct API, swap. Not before. Premature optimization on infra is how indie SaaS dies with a beautifully architected codebase and zero users.

The playbook I'd give past-me:

1. Pick a vertical with anxious, paying buyers (mine: teachers who are scared of AI but legally required to engage with it).
2. Ship on whatever stack gets you live this week.
3. Charge from day one. Free users teach you nothing.
4. Reinvest revenue into infra only when a real number forces you to.
5. Ignore the "SaaS is dead" posts. Those are written by people who haven't talked to a customer in 18 months.

Happy to answer questions about the builder-stack tradeoffs if anyone is on the fence. What's the thing keeping you from shipping?

The jump from a 2 to a 4 on AP Lang almost always comes down to one thing: your thesis isn't doing enough work. A score-2 thesis just identifies a technique. A score-4 thesis makes a specific claim about HOW that technique creates meaning and WHY the author chose it. Instead of "the author uses metaphor to describe war" try "the author's extended metaphor of war as a chess game reduces soldiers to disposable pieces, forcing the reader to confront the dehumanizing logic of military strategy." Same essay, completely different score. Fix the thesis first, everything else follows.