Every modern SaaS tech stack starts the same way: a free Vercel hobby plan, a free Supabase database, free Clerk auth for 10,000 users, and a free PostHog tier. It feels like magic. Then your product goes viral on Hacker News or Product Hunt, and you receive an emergency $1,400 bill on your debit card.
The Free Tier Illusion
Developer platforms don't offer generous free tiers out of charity. Free tiers are top-of-funnel customer acquisition hooks designed to get software developers deeply integrated. Once your user base expands, non-linear cliff pricing kicks in.
6 Critical Infrastructure Categories
- 1. Edge Hosting & Compute: Vercel Pro ($20/mo/seat) + Fast Origin Transfer bandwidth overages.
- 2. Serverless Database: Supabase Pro ($25/mo) + compute instance upgrades (Micro, Small, Medium) + disk IOPS.
- 3. Authentication: Clerk ($25 base + $0.02/MAU above 10k) or Auth0 ($35 base).
- 4. Transactional Email: Resend ($20/mo for 50k emails) or SendGrid.
- 5. Telemetry & Analytics: PostHog or Mixpanel event volume tiering.
- 6. Error Logging: Sentry error quotas and trace transactions.