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 & Metering

Best Usage-Based Billing & Metering Platforms in 2026

AI and API products charge for tokens, calls and credits, and per-seat subscription billing was not built for that. Usage billing platforms meter events, price them and turn them into invoices. Here are the leading options in 2026, from open-source engines you can self-host to the enterprise platforms now owned by Stripe and Adyen.

Usage-Based Billing & Metering Tools Compared

Tool	Pricing	Free tier
Lago	Free · paid from $599/mo
Flexprice	Free · paid from $500/mo
Metronome	Usage-based	—
Orb	Usage-based	—

The Best Usage-Based Billing & Metering Tools, Ranked

1. Lago

Free tier· Free · paid from $599/mo

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

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

Lago & alternatives

2. Flexprice

Free tier· Free · paid from $500/mo

Open-source billing for AI and API products: usage, credits and hybrid pricing with published prices and a free cloud tier.

Open source with a free hosted tier
Published prices, which is rare in billing
Built for credit and wallet models common in AI products

Flexprice & alternatives

3. Metronome

· Usage-based

Usage-based billing platform for AI and cloud companies, now owned by Stripe. Real-time metering, contracts and credits at very high event volume.

Handles very high event volume
Enterprise contracts with commits and credits
Tight Stripe integration now that Stripe owns it

Metronome & alternatives

4. Orb

· Usage-based

Usage-based billing and revenue platform for high-volume SaaS and AI companies, with real-time metering and SQL-defined metrics. Sales-led pricing.

SQL-defined metrics are flexible and auditable
Simulate pricing changes on historical usage
Strong finance and warehouse integrations

Orb & alternatives

How to choose a usage-based billing & metering tool

Check what your payment provider already covers. Stripe Billing handles simple metered prices, and a dedicated platform earns its cost with credits, commits, hybrid pricing or very high event volume.
Choose Lago for the most mature open-source engine. Self-host it free, or start on Lago Cloud free until $250K invoiced.
Choose Flexprice for open-source billing built around credits and wallets, with published cloud prices and a free tier.
Choose Orb when finance wants SQL-defined metrics, pricing simulations and warehouse sync, and you are ready for a sales-led contract.
Choose Metronome for very high event volume and enterprise contracts, especially if you already bill through Stripe, which now owns it.
Model the fee at your revenue in two years. Percentage-of-billings pricing that looks cheap today can become your largest software bill.

Frequently Asked Questions

What are the best usage-based billing & metering tools for startups in 2026?⌄

The best usage-based billing & metering tools for startups in 2026 include Lago, Flexprice, Metronome, Orb. Compare them by pricing, free tiers, and features in the list above.

What is the best free usage-based billing & metering tool?⌄

Free usage-based billing & metering options include Lago, Flexprice — all offer a free tier suitable for bootstrapped startups and MVPs.

How do I choose a usage-based billing & metering tool?⌄

Start with your budget and team size, prefer tools with a free tier to validate, and make sure your pick integrates with the rest of your stack. App Stack Builder can recommend a complete, budget-aware stack in about 60 seconds.

Need the whole stack, not just usage-based billing & metering?

Get a free, AI-powered tech stack — matched to your budget, app type, and team size in 60 seconds.

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