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.

Mobile Framework

The 5 Best Kotlin Multiplatform Alternatives in 2026

Looking for an alternative to Kotlin Multiplatform? Below we compare the best mobile framework alternatives by pricing, free tiers, and what each is best for — so you can pick the right fit for your budget and stack.

Kotlin Multiplatform vs Alternatives — Quick Comparison

Tool	Pricing	Best for
Kotlin MultiplatformYou searched	Free	Mobile Framework — kotlin, cross-platform
Expo (React Native)	Free · paid from $29/mo	Mobile Framework — mobile, react-native
Flutter	Free	Mobile Framework — mobile, flutter
React Native (bare)	Free	Mobile Framework — mobile, react-native
Tauri	Free	Mobile Framework — desktop, tauri
Ionic	Free	Mobile Framework — ionic, capacitor

Top Kotlin Multiplatform Alternatives, Explained

1. Expo (React Native)

Free tier· Free · paid from $29/mo

The fastest way to build cross-platform iOS and Android apps with React Native.

Expo (React Native) pricing & review

2. Flutter

Free tier· Free

Google's UI toolkit for building beautiful, natively compiled apps from a single Dart codebase.

Flutter pricing & review

3. React Native (bare)

Free tier· Free

Meta's framework for building native mobile apps using JavaScript/TypeScript without Expo.

React Native (bare) pricing & review

4. Tauri

Free tier· Free

Build tiny, secure cross-platform desktop and mobile apps with a Rust core and any web frontend.

Tauri pricing & review

5. Ionic

Free tier· Free

Build cross-platform mobile and web apps with web tech (Angular/React/Vue) and one shared codebase.

Ionic pricing & review

Frequently Asked Questions

What are the best alternatives to Kotlin Multiplatform in 2026?⌄

The best Kotlin Multiplatform alternatives in 2026 are Expo (React Native), Flutter, React Native (bare), Tauri, Ionic. Each is a mobile framework option you can compare on pricing, free tiers, and features in the table above.

Is there a free alternative to Kotlin Multiplatform?⌄

Yes — Expo (React Native), Flutter, React Native (bare) offer free tiers, making them strong free Kotlin Multiplatform alternatives for bootstrapped startups.

Why look for a Kotlin Multiplatform alternative?⌄

Common reasons include pricing, a specific feature gap, ease of use, or wanting an open-source or free-tier option. Comparing mobile framework tools side by side helps you pick the best fit for your stack and budget.

Find your perfect mobile framework tool

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

Build my stack free