What is App Stack Builder?

App Stack Builder is a free AI-powered tool that helps founders and developers choose the right tech stack for their projects based on budget, app type, team size, and skill level.

What is the best tech stack for SaaS in 2026?

The best tech stack for SaaS in 2026 typically includes Next.js 16 for frontend, Supabase for database and auth, Vercel for hosting, Stripe for payments, and PostHog for analytics. App Stack Builder can generate a personalized recommendation based on your specific budget and requirements.

Is App Stack Builder free to use?

Yes, App Stack Builder is completely free to use. You can generate unlimited tech stack recommendations without any cost.

What types of apps can I build with the recommended stacks?

App Stack Builder supports various app types including SaaS applications, web apps, mobile apps, e-commerce stores, internal tools, and AI/ML products.

How much does a SaaS tech stack cost per month?

A modern SaaS tech stack can cost anywhere from $0-50/month for bootstrapped startups using free tiers, $100-300/month for growth-stage startups, to $500+/month for enterprise-ready infrastructure. App Stack Builder helps you find the best tools within your specific budget.

What is the best tech stack for solo founders?

For solo founders, we recommend Next.js + Vercel (free), Supabase (free tier), Supabase Auth (free), Stripe (pay as you go), and Plausible or PostHog for analytics. This stack can run your entire SaaS for under $50/month.

Can I export my tech stack recommendations?

Yes, you can export your tech stack recommendations as a PDF document or copy them to your clipboard. You can also share a link to your stack with others.

Database

AWS RDS (PostgreSQL) vs Convex: Which is Better in 2026?

Name: App Stack Builder
Availability: InStock

Choosing between AWS RDS (PostgreSQL) and Convex? Both are popular database tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

Quick verdict

Convex is the safer pick if budget matters — it has a free tier, while AWS RDS (PostgreSQL) does not. Choose AWS RDS (PostgreSQL) when its specific features justify the cost.

AWS RDS (PostgreSQL) vs Convex — Side by Side

	AWS RDS (PostgreSQL)	Convex
Category	Database	Database
Pricing	Usage-based	Free · paid from $25/mo
Starting price	Pay-as-you-go	Free tier available
Free tier	—
Best for	Database — postgresql, relational	Database — backend, baas

Pros & Cons

AWS RDS (PostgreSQL)

Battle-tested for financial workloads
Seamless AWS ecosystem integration
Automated failover & backups
Full compliance certifications

Usage-based cost scales with load
Vendor lock-in to AWS
Requires VPC/networking knowledge

Convex

Excellent real-time data model
Very fast developer iteration
TypeScript-first backend
Built-in cron, auth, and storage
AI-assisted app generation

Pricing is per-developer at scale
Less control than self-managed databases
Ecosystem smaller than traditional databases

Choose AWS RDS (PostgreSQL) if…

AWS RDS (PostgreSQL) Amazon's fully managed PostgreSQL with automatic backups, multi-AZ failover, and enterprise-grade reliability.

AWS RDS (PostgreSQL) review & pricing

Choose Convex if…

you want a free tier to start, and Convex Reactive backend-as-a-service with a built-in database, real-time queries, serverless functions, and AI-powered app generation.

Convex review & pricing

Frequently Asked Questions

Is AWS RDS (PostgreSQL) better than Convex?⌄

Convex is the safer pick if budget matters — it has a free tier, while AWS RDS (PostgreSQL) does not. Choose AWS RDS (PostgreSQL) when its specific features justify the cost.

What is the difference between AWS RDS (PostgreSQL) and Convex?⌄

AWS RDS (PostgreSQL) — Amazon's fully managed PostgreSQL with automatic backups, multi-AZ failover, and enterprise-grade reliability. Convex — Reactive backend-as-a-service with a built-in database, real-time queries, serverless functions, and AI-powered app generation. Both are database tools; the comparison table above breaks down pricing, free tiers, and what each is best for.

AWS RDS (PostgreSQL) vs Convex: which is cheaper?⌄

AWS RDS (PostgreSQL) pricing: Usage-based. Convex pricing: Free · paid from $25/mo. Confirm current pricing on each tool's official site, as plans change.

See more options in our guide to the best database tools for startups.

Still not sure which to pick?

Get a free, AI-powered tech stack — including the best database pick for your budget and team — in 60 seconds.

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