What will my stack actually cost?

Tick the tools you use, pick a tier for each, and see your fixed monthly total. Every price comes from the tool's official pricing page, with the date we last checked it.

At 1,000 and 10,000 users (estimates)

Only for tools whose official pricing is tied to users or a user-driven volume. Every figure is an estimate under the assumption shown; your real bill depends on how people use your app. Usage limits are quoted from each official pricing page, with the date we read them.

Tool	1,000 users	10,000 users	Assumption
Clerk Auth	$0/mo estimate · Hobby (free); 1,000 is under the 50,000 limit	$0/mo estimate · Hobby (free); 10,000 is under the 50,000 limit	Every user counts as a monthly retained user (worst case; Clerk only counts users who return after their first day). Published pricing: Hobby (free): 50,000 MRU limit per app. Pro: 50,000 MRU included per app, then $0.02/mo each. official pricing ↗ read Oct 22, 2026
Supabase Auth	$0/mo for auth estimate · Free plan; under 50,000 MAU	$0/mo for auth estimate · Free plan; under 50,000 MAU	Every user is a monthly active user. Auth only: database size, egress and storage are billed on usage, and Free projects pause after 1 week of inactivity. Published pricing: Free: 50,000 monthly active users. Pro (from $25/mo): 100,000 MAU included, then $0.00325 per MAU. official pricing ↗ read Oct 22, 2026
Resend Email	$0/mo estimate · 2,000 emails (about 67/day): within Free (3,000/mo, 100/day)	$20/mo estimate · 20,000 emails: over Free, within Pro (50,000)	2 transactional emails per user per month (for example sign-up and receipt), spread evenly over the month. Published pricing: Free: 3,000 emails/mo, 100/day. Pro: $20/mo for 50,000. official pricing ↗ read Oct 21, 2026

Depends on usage

Stripe (Payments): Charged per transaction, so it depends on your revenue, not your user count. official pricing ↗
PostHog (Analytics): Charged per event after the free tier; events per user vary too much to estimate. official pricing ↗
LLM APIs (OpenAI, Anthropic, OpenRouter…) (AI): Charged per token; depends on how much each user uses AI features. price watch
Vercel, Railway, Netlify (Hosting): Fixed plan price plus usage (bandwidth, compute); depends on traffic. price watch

Price data last run 2026-10-21. Only tools marked “Tried it” have our own hands-on tests; everything else is from official pricing pages.

What will my stack actually cost?

AI coding tools

Shipping

Agents

Design & assets

Models & APIs

At 1,000 and 10,000 users (estimates)

Depends on usage