Build my AI stack
Tell us what you're building and we'll pick one top-ranked tool for every layer, from prompt to production (including email and analytics). Picks come straight from our evidence-based scores; sponsors can't buy a spot here.
Open-source AI coding agent for the terminal, desktop and IDE
Free tier: Yes: 100% free to use, with a set of free models that work without an account
Runners-up: OpenAI Codex (86), Kilo Code (83)
All OpenCode alternatives →Open-source Postgres development platform
Free tier: Yes: 2 projects, 500 MB DB, 50K MAU, 1 GB storage (pauses after 1 week idle)
Runners-up: Neon (86), Convex (84)
All Supabase alternatives →User management and authentication
Free tier: Yes: 50,000 monthly retained users per app
Runners-up: Better Auth (86), Supabase Auth (85)
All Clerk alternatives →Payments infrastructure
Free tier: No monthly fee (pay per transaction)
Runners-up: Polar (82), RevenueCat (79)
All Stripe alternatives →Email API for developers
Free tier: Yes: 3,000 transactional emails/mo (100/day), 1,000 marketing contacts
Runners-up: Loops (79), Postmark (76)
All Resend alternatives →Product analytics, session replay and feature flags in one
Free tier: Yes: generous free tier that resets monthly (1M events, 5K replays, 1M flag requests, 100K exceptions); no credit card required on Free
Runners-up: Sentry (84), Umami (84)
All PostHog alternatives →Frontend cloud for deploying web apps
Free tier: Yes: Hobby plan for personal, non-commercial projects
Runners-up: Cloudflare Workers (82), Railway (80)
All Vercel alternatives →Open-source end-to-end browser testing
Free tier: Yes: free Apache-2.0 framework
Runners-up: Cypress (88), Vitest (87)
All Playwright alternatives →Make a tool for one of these layers?
Get in front of builders choosing their stack. Clearly labeled featured listings from $49 for 30 days. Picks on this page stay score-based.
How it works: for each layer we take the highest-scoring tool that matches your filters. "Start free" keeps tools with a free tier or no monthly fee (payments providers charge per transaction). Some outbound links are affiliate links marked rel="sponsored"; they never change the picks. Scores last verified October 2026.