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.

Bot Protection & CAPTCHA

Best Bot Protection & CAPTCHA Tools in 2026

Fake signups, credential stuffing and form spam all come from bots, and the old picture puzzle now costs you more real users than it stops bots. These tools check visitors in the background and only challenge the suspicious ones. Here are the leading options in 2026, from free CAPTCHA widgets to an SDK that enforces rules inside your app.

Bot Protection & CAPTCHA Tools Compared

Tool	Pricing	Free tier
Cloudflare Turnstile	Free · paid plans by quote
Arcjet	Free · paid from $25/mo
hCaptcha	Free · paid from $99/mo
Google reCAPTCHA	Free · paid from $8/mo

The Best Bot Protection & CAPTCHA Tools, Ranked

1. Cloudflare Turnstile

Free tier· Free · paid plans by quote

Free CAPTCHA replacement from Cloudflare: an invisible or one-click check with unlimited challenges, and your site does not need to be on Cloudflare.

Free with no request cap
Most visitors never see a puzzle
Works on sites that are not on Cloudflare

Cloudflare Turnstile & alternatives

2. Arcjet

Free tier· Free · paid from $25/mo

Bot detection, rate limiting and a WAF as an SDK inside your app, with rules set per route in code. No CAPTCHA for your users to solve.

Rules per route and per user, in code
Bot detection, rate limiting and WAF in one call
Apache-2.0 JavaScript SDK

Arcjet & alternatives

3. hCaptcha

Free tier· Free · paid from $99/mo

Privacy-focused CAPTCHA with a free plan, and a Pro plan that adds a 99.9% passive mode where almost nobody sees a challenge.

Near drop-in swap for reCAPTCHA
Privacy-first, no ad tracking
Free plan for basic protection

hCaptcha & alternatives

4. Google reCAPTCHA

Free tier· Free · paid from $8/mo

Google's bot and fraud protection: a risk score for every action, free up to 10,000 assessments a month, then $8 a month up to 100,000.

Most widely deployed, well documented
Cheap: $8 covers up to 100K a month
Fraud and account defense beyond bots

Google reCAPTCHA & alternatives

How to choose a bot protection & captcha tool

Choose Cloudflare Turnstile for free, unlimited protection where most visitors never see a puzzle. Your site does not need to be on Cloudflare.
Choose hCaptcha for a privacy-first, near drop-in swap for reCAPTCHA. Its low-friction passive mode needs Pro.
Choose Google reCAPTCHA when you also want fraud signals such as account takeover, password and carding protection. It is free up to 10,000 assessments a month.
Choose Arcjet to set bot, rate-limit and WAF rules per route in your code, with no challenge shown to users.
Count where the free allowance runs out: Turnstile has no cap, reCAPTCHA shares 10,000 a month across all your sites, and Arcjet stops at 10,000 requests.

Frequently Asked Questions

What are the best bot protection & captcha tools for startups in 2026?⌄

The best bot protection & captcha tools for startups in 2026 include Cloudflare Turnstile, Arcjet, hCaptcha, Google reCAPTCHA. Compare them by pricing, free tiers, and features in the list above.

What is the best free bot protection & captcha tool?⌄

Free bot protection & captcha options include Cloudflare Turnstile, Arcjet, hCaptcha, Google reCAPTCHA — all offer a free tier suitable for bootstrapped startups and MVPs.

How do I choose a bot protection & captcha 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 bot protection & captcha?

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

Build my stack free