The Almost-Free Stack: Build a SaaS in 2026 for ~$0

Buttr, reviewing the invoices: "cancelled the $800/month stack. replaced it with this. the product still ships."

In 2026, you can host a full SaaS — compute, database, auth, email, analytics, payments, and customer support — for roughly $0 until real revenue arrives. The tools below have free tiers with specific, honest limits that cover a real product at early traction. You rarely need all seven on day one; add each layer when the product requires it.

1. Cloudflare — Hosting, compute, and storage

What it is: One edge platform for Pages (Git-connected Next.js/Astro hosting), Workers (serverless edge functions), R2 (S3-compatible object storage), D1 (serverless SQLite), and a global CDN with unmetered bandwidth.

Real free-tier limits: 100,000 Worker requests per day, 10ms CPU time per request, unlimited Pages bandwidth + 500 builds per month, 10 GB R2 — with zero egress fees (the biggest quiet win in the stack).

Watch: 100k/day and 10ms CPU are hard caps. Heavy compute or high-traffic apps hit both. Workers Paid starts at $5/month. D1 free tier is 5M row reads per day — enough for early products, tight for anything write-heavy.

Get started: npm create cloudflare@latest scaffolds a Worker or framework app; connect a GitHub repo in Pages for auto-deploys.

2. Neon — Serverless Postgres with branching

What it is: Fully-managed serverless Postgres that separates storage from compute, scales to zero when idle, and supports Git-style database branches (copy-on-write, per-PR). Works with Drizzle, Prisma, and Kysely. Acquired by Databricks in 2025.

Real free-tier limits: 0.5 GB storage, 100 compute-hours per month, up to 10 branches. Scale-to-zero means idle apps consume near-zero compute hours.

Watch: An always-warm app exhausts the 100 compute-hours in about a week. Scale-to-zero adds a ~0.3–1 second cold-start on first query. Use the @neondatabase/serverless driver for edge runtimes — plain TCP from a Worker won't reach Neon without it.

Get started: Create a project at neon.tech → copy the connection string into DATABASE_URL.

3. Better Auth — Self-hosted TypeScript auth

What it is: Open-source (MIT), framework-agnostic TypeScript auth that runs inside your own app and database. ~28k+ GitHub stars. The Auth.js (NextAuth) maintainers joined in 2025. Works with Next.js, Nuxt, Hono, and any Drizzle/Prisma schema.

Real free-tier limits: Free forever, MIT license. No per-MAU billing — cost does not scale with your users (contrast Auth0 at $240/month for 1,000 MAU, or Clerk gating features behind paid plans).

Watch: You own migrations, patching, and security posture. The project launched in 2024; the API surface is still stabilizing.

Get started:

bun add better-auth
bunx @better-auth/cli generate   # generate the auth schema
# mount app/api/auth/[...all]/route.ts and set BETTER_AUTH_SECRET

4. Infisical — Secrets management

What it is: Open-source secrets manager (cloud or self-hosted) for centralizing environment variables across dev, staging, and production. ~27k+ GitHub stars, YC-backed.

Real free-tier limits: Cloud free forever — 5 members/machine identities, 3 projects, 3 environments, 10 integrations. Self-host the open-source core for unlimited everything.

Watch: Point-in-time recovery and fine-grained RBAC are paid or self-hosted. The 5-identity cloud cap is comfortable for one founder; tight for a small team.

Get started:

infisical login && infisical init
infisical run -- bun dev   # inject secrets at runtime instead of .env

5. Resend — Transactional email

What it is: Developer-first transactional email API from the team behind React Email. Clean REST API, React Email templates (JSX components), webhooks, 30-day searchable logs, and SPF/DKIM/DMARC setup guides.

Real free-tier limits: 3,000 emails per month, 1 custom sending domain, 100 emails per day.

Watch: The 100/day cap is the real constraint — not the monthly total. A welcome email + password reset + onboarding drip can brush the ceiling if multiple users sign up the same hour. Verify a sending domain before going to production; [email protected] is test-only.

Get started: npm i resend → create an API key → verify your domain in the dashboard (DNS records, ~5 minutes).

6. PostHog — Analytics, feature flags, and error tracking

What it is: All-in-one product platform covering analytics, session replay, feature flags, A/B experiments, error tracking, and behavior-triggered email Workflows — in one free tier.

Real free-tier limits (monthly, cloud): 1M analytics events, 5,000 session replays, 1M feature-flag requests, 100,000 error events, 10,000 Workflow emails. Self-hosted version is MIT with no event cap.

Watch: Email Workflows are in beta on the cloud tier. Autocapture is generous but noisy — tune it early or your event table becomes unreadable. Self-hosted PostHog needs a server; Hetzner's smallest VPS (~€4/month) handles it.

Get started: npm i posthog-js → posthog.init('<key>', { api_host: 'https://us.i.posthog.com' }). Wire up signup → activation → paid as events on day one.

7. Krispy — AI live chat with Telegram handoff

What it is: Open-source AI live chat for solo founders. The bot answers visitors from a knowledge base; when it's a human job, it taps you on Telegram. Runs natively on Cloudflare Workers — no VPS, no Postgres needed. You reply from your phone; it appears live in the widget. You own your conversation data — no vendor lock-in.

Real free-tier limits: Self-host is $0 — Cloudflare Workers free tier covers early traffic; you pay only for your own LLM API calls. Krispy Cloud is $19/month flat, no per-seat tax.

Watch: Self-hosting means you manage deployments and updates. For a heavier multi-agent inbox with a full dashboard, Chatwoot (MIT, 22k+ stars) is the proven alternative — see the best open-source live chat comparison for the full breakdown. Chatwoot needs a VPS. How Krispy compares to Intercom is here.

Get started: git clone https://github.com/lonormaly/krispyai → wrangler deploy → add your Telegram bot token. Full walkthrough at self-host live chat on Cloudflare.

The stack together

Cloudflare (hosting) → Neon (database) → Better Auth (users in your own DB) → Infisical (secrets at runtime) → Resend (transactional email) → PostHog (analytics and errors) → Krispy (support). Add each layer when the product needs it, not all on day one.

The honest cost

The stack above runs at $0 pre-revenue, with three real caveats:

• LLM API calls cost money from request one. If you're building an AI product, there is no free tier worth planning around. Cache aggressively; use smaller models for high-volume calls.
• Neon's compute hours run faster than expected. An always-warm database exhausts 100 hours in about a week. Scale-to-zero is your friend until you have consistent traffic.
• Resend's 100 emails/day cap is tighter than it looks. Plan your daily send budget before a welcome + drip + reset sequence surprises you on signup day.

The honest number: $0–15/month before revenue — basically a domain (Cloudflare Registrar, at-cost) plus occasional LLM calls. Bills scale only as your users (and income) do.

FAQ

Is this stack production-ready, or just for prototypes?

Each tool here runs real production workloads. Cloudflare Workers serves billions of requests per day; Neon is backed by Databricks; Better Auth has 28k+ stars. The free tiers have hard limits — the products themselves are production-grade. You'll outgrow the free tiers well before you outgrow the tools.

What happens when I exceed the free tier?

Cloudflare Workers Paid starts at $5/month. Neon Pro starts at $19/month. Resend's first paid tier is $20/month for 50k emails. PostHog charges per event above 1M at roughly $0.00031 — most early products won't reach that for months. Krispy Cloud is $19/month flat when you want to drop the self-hosted ops.

Do I need all seven tools to ship?

No. Day one: Cloudflare, Neon, Better Auth. Add Resend when you need email, PostHog when you need a funnel, Infisical when you have more than two secrets, and support tooling when real users are asking real questions.

What about payments? Is there an honest near-free MoR option?

Dodo Payments has no monthly fee and takes 4% + $0.40 per transaction as a Merchant of Record, handling VAT and sales tax in 190+ countries. The watch: they hold your revenue, so confirm your payout country is supported before committing. Creem is a newer MoR in the same price range worth comparing.

How does Krispy compare to Intercom or Crisp for bootstrapped founders?

Intercom scales steeply with seats and contacts. Crisp paid starts at $25/month per workspace. Krispy self-hosted is $0, no per-seat cost ever, running on the same Cloudflare Workers infrastructure you already have. The real tradeoff: Intercom has years of polish. Krispy is built for the range where per-seat pricing hurts before you have revenue to justify it. The full comparison is here.

Self-host Krispy free at github.com/lonormaly/krispyai — one wrangler deploy on Cloudflare Workers. Or skip the ops with Krispy Cloud at $19/month flat, no per-seat tax.