Free backend stack
Zero-cost services that can power the entire Achoo client console — from one-click OAuth registration to billing, email and support. Every stub in this codebase is shaped to drop in behind these providers.
Auth
ClerkFree · 10k MAUGoogle/GitHub OAuth + magic links + sessions out of the box. The fastest path to the openrouter.ai UX.
Supabase AuthFree · 50k MAUHosted Postgres + built-in auth, RLS for row-level security (SEC-38 deny-by-default).
Better AuthOpen sourceSelf-hosted auth library on your own DB — full control, zero per-seat cost.
Database
NeonFree · 0.5 GBServerless Postgres with branching — great for dev/prod previews.
Turso / libSQLFree · 9 GBEdge-replicated SQLite — sub-ms reads close to your users.
MongoDB Atlas M0Free · 512 MBDocument store for flexible telemetry / usage event shapes.
Billing
StripeFree · % per txSubscriptions, invoices and webhooks; the standard for developer billing.
Lemon SqueezyFree · % per txMerchant-of-record: handles global tax/VAT so you don't have to.
PaddleFree · % per txAlternative MoR with enterprise invoicing and compliance.
ResendFree · 3k/moDeveloper-friendly transactional email + React Email for magic links.
LoopsFree · 1k/moLifecycle email and product-led onboarding sequences.
Support
CrispFree · 2 seatsLive chat + shared inbox — powers the dashboard Support hub.
ChatwootOpen sourceSelf-hosted helpdesk with API for ticket automation.
Storage & Edge
Cloudflare R2Free · 10 GBS3-compatible object storage with zero egress fees.
Upstash RedisFree · 10k cmd/dayRate limiting (SEC-39) and KV cache at the edge.
Recommended baseline: Clerk (auth) + Neon (Postgres) + Stripe (billing) + Resend (email) + Crisp (support) + Upstash (rate limits). All within free tiers for a launch.