In classrooms across the world, a quiet crisis has long persisted. Beyond funding, curriculum reforms, or infrastructure, it’s the invisible burden shouldered by educators — the relentless, thankless grind of grading. For every essay, every project, every rubric-aligned comment, teachers spend countless hours after school, during weekends, or in the dim light of early mornings. And even then, the feedback students receive often lacks the individualised care needed to help them truly improve. It’s not for lack of desire; teachers want to help. But time is finite, and paper piles are infinite. Here enters VibeGrade: a Y Combinator-backed startup that’s not here to replace teachers, but to amplify them.
VibeGrade has developed an AI-powered assistant that helps teachers deliver personalised, high-quality feedback on student work up to 10x faster, without losing their authentic voice. Operating seamlessly within Google Docs, Google Classroom, and Canvas, the platform mimics how a teacher reads, interprets, and annotates essays, all based on the teacher’s rubric and style. Already, the tool has saved over 500 school days across 12,000 graded papers. In doing so, it has improved workflows and transformed the relationship between feedback and learning.
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Closing the Feedback Gap
Education experts have long identified the “feedback gap” — the disconnect between student effort and the actionable, timely input they need to grow. According to a 2023 OECD report, more than 60% of secondary education students report receiving limited or delayed teacher feedback, largely due to time constraints. This is not merely an administrative problem, but a pedagogical one. Feedback is the lifeblood of learning. VibeGrade’s founders understand this. And they’ve taken it personally.
From High School Hallways to Silicon Valley
VibeGrade was born not in a boardroom or research lab but in the restless minds of two teenagers—Daniel Martinez and Musa Aqeel, who dropped out of high school and college, respectively, to chase a mission they couldn’t let go of.
Daniel, now 18, has been coding since he was ten. He always knew he’d build something big, not for fame, but for impact. “The education system is broken,” he says bluntly. “Students aren’t getting the feedback they need, and teachers are burning out. We knew AI could help, but it had to work the way teachers actually work.”
Musa, now 19, joined Daniel after years of friendship and side projects — including a party app that let guests vote on music via QR code. That same experimental energy led them to build and iterate on an early version of VibeGrade. It wasn’t smooth sailing. The duo applied to Y Combinator five times before finally getting in.
“People see our age and assume luck,” Musa says, “but we’ve been grinding. Building. Failing. Rebuilding.” And when they finally got that coveted YC interview email? “We were on FaceTime,” he recalls. “Just in shock. But also ready.”
A Vision Rooted in Empathy
At its core, VibeGrade’s mission is simple: to make teaching easier and learning more effective. Their approach isn’t about automating education into a cold, algorithmic process. Instead, they’re putting teachers at the centre of a new technological ecosystem — one that learns from them, not over them.
“AI shouldn’t replace great educators,” says Daniel. “It should make them even better.”
It’s a message that resonates. All 72 of VibeGrade’s early users are educators who pay out of pocket, a striking vote of confidence in a sector not known for spending easily. It’s also a reflection of deep pain: the hours saved by VibeGrade aren’t just minutes off a clock; they’re sanity, sleep, and time with family.
Backed by Belief (and Y Combinator)
YC believed too. The famed accelerator, which has propelled Airbnb, Dropbox, and Stripe, saw something in VibeGrade: not just tech, but grit. “It’s about the people,” Musa notes. “YC saw our track record of building, our resilience, and the fact that we weren’t guessing, we were solving a real problem.”
With YC backing and a public launch now underway, the momentum is real. School interest is growing, and so is societal openness to AI in education. The same institutions that once dismissed Daniel’s emails now see the tide turn. “When I started, AI in education was taboo,” Daniel reflects. “Now, it’s the conversation.”
The Road Ahead
VibeGrade is now focused on scaling—expanding to more classrooms in the US and beyond. Their roadmap includes richer integrations, deeper teacher customisation, and expanded use cases into subjects beyond essays. But the mission stays the same: to give teachers their time back, and give students feedback that helps them grow. Because in the end, this isn’t just about grading papers faster. It’s about raising the grade on education itself.
