What is App Stack Builder?

App Stack Builder is a free AI-powered tool that helps founders and developers choose the right tech stack for their projects based on budget, app type, team size, and skill level.

What is the best tech stack for SaaS in 2026?

The best tech stack for SaaS in 2026 typically includes Next.js 16 for frontend, Supabase for database and auth, Vercel for hosting, Stripe for payments, and PostHog for analytics. App Stack Builder can generate a personalized recommendation based on your specific budget and requirements.

Is App Stack Builder free to use?

Yes, App Stack Builder is completely free to use. You can generate unlimited tech stack recommendations without any cost.

What types of apps can I build with the recommended stacks?

App Stack Builder supports various app types including SaaS applications, web apps, mobile apps, e-commerce stores, internal tools, and AI/ML products.

How much does a SaaS tech stack cost per month?

A modern SaaS tech stack can cost anywhere from $0-50/month for bootstrapped startups using free tiers, $100-300/month for growth-stage startups, to $500+/month for enterprise-ready infrastructure. App Stack Builder helps you find the best tools within your specific budget.

What is the best tech stack for solo founders?

For solo founders, we recommend Next.js + Vercel (free), Supabase (free tier), Supabase Auth (free), Stripe (pay as you go), and Plausible or PostHog for analytics. This stack can run your entire SaaS for under $50/month.

Can I export my tech stack recommendations?

Yes, you can export your tech stack recommendations as a PDF document or copy them to your clipboard. You can also share a link to your stack with others.

Usage-Based Billing & MeteringFree tier

Lago: Pricing, Features & Alternatives

Lago is the most-starred open-source billing engine (10K+ GitHub stars, AGPL-3.0). It ingests usage events, aggregates them into billable metrics, and handles plans, prepaid credits, entitlements, coupons, invoicing and a customer portal, then hands payment to Stripe, Adyen or GoCardless. You can self-host the open-source edition for free. Lago Cloud's Starter tier is free until $250K of cumulative invoiced revenue, then 0.75%. 2026 sources list a Performance plan at $599/month. Business and Enterprise (premium features, SSO, self-hosted support) are quote-only.

Lago Pricing Plans (2026)

Plan	Price	Highlights
Open Source	$0 (self-hosted, AGPL)	Metering and billable metrics · Plans, credits and invoicing · Payment provider integrations
StarterPopular	Free to $250K billed, then 0.75%	Hosted by Lago · Usage ingestion and invoicing
Performance	$599 / month	Higher event throughput · Includes $100K / month billing volume
Enterprise	Custom	Premium features · SSO · Dedicated support

Pricing summary: Free · paid from $599/mo. Always confirm current pricing on the official site.

Key Lago Features

Hosted by Lago
Usage ingestion and invoicing

Pros

+Open source and self-hostable
+Handles hybrid subscription + usage pricing
+Works with several payment providers, not just Stripe

Cons

−Self-hosting billing means you own its uptime
−Advanced features (RBAC, SSO) are paid add-ons
−Cloud pricing beyond Starter is mostly quote-based

Best Lago Alternatives

Compare all

Flexprice

Free · paid from $500/mo

Metronome

Usage-based

Orb

Usage-based

Lago Compared

Lago vs Metronome Lago vs Orb Lago vs Flexprice

Lago FAQ

What is Lago used for?⌄

Lago is a usage-based billing & metering tool. Open-source usage-based billing: meter events, price them with any model, and generate invoices. Self-host free or use Lago Cloud.

Is Lago free?⌄

Yes — Lago has a free tier you can start with, and paid plans for more usage and features.

How much does Lago cost?⌄

Lago offers a free tier, with paid plans starting at $599/month. Some plans are usage-based (pay-as-you-go).

What are the best Lago alternatives?⌄

Popular Lago alternatives include Flexprice, Metronome, Orb. Compare pricing and features on our Lago alternatives page.