Founder Cost Diaries

"Free tiers carried me for 4 months. First real cost was Supabase Pro when I hit 500MB."

"OpenAI costs are the elephant in the room. At 1000 users, LLM spend was 60% of total costs."

"Self-hosting on Hetzner = $11/mo total. Could run 100k visitors without upgrading."

"Stripe Connect take rate covers infra costs. Marketplace model = infra paid by transaction fees."

"Open source core drives adoption. Lemon Squeezy handles tax/VAT so I focus on code, not compliance."

"Per-client hosting on Vercel adds up. Moved some clients to Cloudflare Pages to cut costs 60%."

"Algolia costs exploded with product variants. Switched search to Meilisearch Cloud — saved $200/mo."

"Fly.io + self-managed Postgres = 3x cheaper than Railway/Supabase at our scale. Worth the ops overhead."

"RevenueCat takes 1% but handles Apple/Google billing. Saved months of IAP implementation work."

"Anthropic spend was 70% of total cost. Prompt caching cut input tokens 60% — saved $400/mo at the same usage."

"Pinecone Standard plan ($70/mo) hit before 100 paying customers. Migrated to Postgres pgvector — saved $50/mo."

"Mux streaming costs scale with viewer-minutes. At 1M monthly minutes, video became the #1 line item."

"Buttondown at 25k subs costs $79/mo. Beats Substack 10% take rate by month 3 of paid subscribers."

"WorkOS for SSO unlocked enterprise deals at month 6. The $125 base/$1.25 per SSO connection paid for itself in one contract."

"Modal's per-second GPU billing meant idle = $0. Cold starts hurt UX — kept warm pool of 2 containers ($60/mo extra) for paid users."

"Self-hosted everything on a single Hetzner CX22 ($6/mo). Runs CLI license server, marketing site, Postgres, and analytics."

"$50/mo total stack supports 18k subs. Buttondown beats Substack's 10% take rate by month 4 of paid subs."

"Costs scale 0→$200/mo: $0 when on free tiers, $200 when running heavy CI for matrix tests across OSes."

"$120/mo total infra for 5 client sites. Per-site Plausible would have cost $45/mo — self-hosted CE handles all."

"$800/mo burn pre-revenue: Anthropic ($400) + Modal GPU ($300) + Vercel ($45) + everything else. LLM is the budget."

"$45/mo for 600k monthly visitors. CF Pages serves it free, Plausible $9 tracks it, ConvertKit $29 keeps the list."

"$90/mo serves 8k creators. CF Pages handles spiky stream traffic; Supabase Pro covers OAuth + dashboard data."

"$35/mo Expo+Supabase backend. Apple/Google take 15-30% but RevenueCat handles all IAP plumbing."

"$210/mo serves 40M API calls/month across 3 regions. Fly multi-region + Neon autoscaling = predictable scaling."

"pgvector on Neon replaced Pinecone ($70/mo) at month 4. Saved $840/yr with no meaningful performance hit at our scale."

"Open-source drove 3k GitHub stars before cloud launch. $22/mo infra for self-host + $29 Typesense cloud for managed offering."

"Liveblocks anonymous MAU burned through Pro plan at month 5. Anonymous viewers counted — moved to LiveKit for whiteboard presence, saved $180/mo."

"WorkOS at $125/SSO connection paid for itself with the first enterprise deal. Priced SSO into $500/mo enterprise tier — $375 margin per enterprise customer per month."

"Modal per-second GPU billing meant development runs during prototyping cost almost nothing. Cold start latency was the UX problem, not cost."

"Polar handled EU VAT and international taxes. The 4% MoR fee was cheaper than hiring an accountant or building tax logic."

"ElectricSQL sync = users never see loading spinners. Offline-first UX is a real sales differentiator in B2B."

"Self-hosted Langfuse for our own tracing saved $700/yr vs cloud plan. Dogfooding our own product + OSS stack = maximum credibility."

"Cerebras inference at 2000 tok/s = users perceive instant responses. Switched from OpenAI — same quality, 3x faster, 40% cheaper."

"Kamal deploy to Hetzner = zero vendor lock-in. Rails 8 Solid Queue replaced Sidekiq+Redis — one less service to manage."

"Anthropic prompt caching cut costs 65% — same PR review quality. Caching the repo context across reviews was the key insight."

"Self-hosted Hatchet replaced Temporal Cloud — saved $1,500/mo at 500K workflow runs. Worth the ops overhead for our team size."

"Mintlify at $150/mo seemed expensive but converted 3x more free-to-paid users vs our custom docs. ROI was immediate."

"Self-hosted Cal.com on Hetzner = $0 licensing. Built custom booking workflows on top. Calendly would cost $960/yr for 5 team seats."

"PGlite runs Postgres in the browser. Zero server costs for database. Total infra is literally $14/mo for a notes app with 5k users."

"Twenty CRM self-hosted replaced HubSpot ($540/yr for 3 seats). Same CRM features, full data ownership, $18/mo total."

"RunPod spot A40 at $0.39/hr = 60% cheaper than on-demand. Queue-based generation absorbs spot preemptions gracefully."