A full-stack AI side project with a live URL, a real database, and an LLM integration costs under $5 in 2026 if you stack the right free tiers correctly. Vercel hosts the frontend for free. Supabase gives you a free Postgres database. Groq or Google AI Studio handle AI inference at zero cost. Railway covers backend hosting if you need it. The $5 ceiling is generous. Most projects land at zero.
Analysis Briefing
- Topic: Full-Stack AI Side Project on Free Tier Stack
- Analyst: Mike D (@MrComputerScience)
- Context: What started as a quick question to Gemini 2.0 Flash became this
- Source: Pithy Cyborg | Pithy Security
- Key Question: What is the exact free tier stack that ships a real AI project with a live URL in 2026?
The Exact Free Tier Stack That Ships a Live AI Project
Every layer of a production-grade full-stack AI project has a free tier equivalent in 2026 that requires no credit card and has no hard expiry.
Frontend: Vercel’s hobby tier deploys any Next.js, React, or static site from a GitHub repository automatically on every push. You get HTTPS, a global CDN, and preview deployments for branches at zero cost. Your project lives at yourproject.vercel.app permanently. For a side project portfolio piece, this URL is completely professional.
Database: Supabase free tier gives you a Postgres database with 500MB storage, a REST API generated automatically from your schema, authentication with social login support, and real-time subscriptions. The free tier pauses after one week of inactivity but resumes immediately on the next request. For a side project with irregular usage, this is not a meaningful limitation.
AI inference: Groq free tier at 14,400 requests per day on Llama 3.3 70B, or Google AI Studio free tier for Gemini 2.5 Flash with the million-token context window. Both expose OpenAI-compatible endpoints that connect to any Python or JavaScript LLM library without modification.
Backend (if needed): Railway’s free trial gives you $5 in credits monthly, which covers a small always-on backend container. Render’s free tier hosts a web service that spins down after 15 minutes of inactivity and spins back up in 30 seconds. For a side project without sustained traffic, spin-down is acceptable. For an always-on backend, Railway’s $5 credit covers a lightweight FastAPI or Express server for a full month.
The projects that stay at zero dollars: static frontends with direct LLM API calls from the browser, serverless functions on Vercel that proxy API calls, and any project where Supabase’s built-in auth and REST API eliminate the need for a custom backend entirely.
Three Project Ideas That Fit This Stack and Get Attention
The stack is only half the work. Picking a project that demonstrates genuine capability rather than tutorial familiarity is what makes the side project worth putting on a portfolio. Why RAG pipelines fail is required reading before building any of the document-processing projects below: the failure modes at scale are documented, and a project that shows awareness of them is more impressive than one that ignores them.
AI document summarizer with persistent storage. A Next.js frontend where users paste text or upload a PDF. Vercel serverless function sends it to Groq for summarization. The summary and original text are saved to Supabase with Supabase Auth handling user accounts. Users can browse their history. This is a complete full-stack application with auth, database, AI integration, and a live URL. Build time: one weekend.
Personal AI assistant with memory. A chat interface that stores conversation history in Supabase and injects the last five exchanges into every Groq API call for context continuity. Users log in with GitHub via Supabase Auth. The “memory” is just a database query prepended to the system prompt. It feels magical and costs nothing. Build time: one weekend.
Job listing relevance scorer. A form where you paste a job description and your resume. A Vercel serverless function sends both to Gemini 2.5 Flash via Google AI Studio with a structured prompt asking for a match score, missing skills, and a tailored one-paragraph cover letter opener. Results are saved to Supabase for comparison across applications. This solves a real problem the developer actually has, which makes the write-up authentic. Build time: one afternoon.
Avoiding the Free Tier Traps That Kill Side Projects Mid-Build
Three specific free tier behaviors catch developers by surprise and stall projects at the worst possible time.
Supabase pauses inactive databases after seven days on the free tier. The pause is automatic and the resume on first request takes 5 to 10 seconds. For a demo you are showing a recruiter, this cold start produces an embarrassing wait. Fix it by setting up a free cron job on cron-job.org that pings your Supabase project’s health endpoint every 24 hours to keep it active.
Vercel’s hobby tier does not allow commercial use. Side projects and portfolio pieces are fine. If a project starts generating revenue, Vercel’s terms require upgrading to the pro tier. Know this before monetizing anything hosted on a free Vercel account.
Groq’s free tier does not support streaming responses on all models. If your chat interface uses streaming to display tokens as they arrive, test it specifically on the Groq free tier before building the entire UI around that behavior. Fall back to non-streaming if the model or tier does not support it, then add streaming later when it is available or when you have budget for a paid tier.
Railway’s free credits reset monthly but require a verified payment method on file even for the free tier. If adding a card is not an option, Render’s free tier or Fly.io’s free allowance are genuine alternatives with no card required.
What This Means For You
- Start with a Vercel and Supabase project before adding a backend. Supabase’s auto-generated REST API and built-in auth eliminate the need for a custom backend on most side project architectures, keeping the stack simpler and the free tier ceiling higher.
- Set up a daily ping cron job on cron-job.org the day you deploy to Supabase. A paused database during a recruiter demo is the most avoidable bad impression in a portfolio showcase.
- Pick a project that solves a problem you personally have. The job listing relevance scorer is more credible than a generic chatbot because you can explain why you built it, what edge cases you discovered, and what you would improve with more time. Authenticity in a side project write-up is detectable and valued.
- Ship in one weekend, improve in the next. A live URL that exists is worth ten locally-running projects that nobody has ever seen. Imperfect and deployed beats perfect and local every single time for portfolio purposes.
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