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.

Session Replay & Heatmaps

Best Session Replay & Heatmap Tools in 2026

Analytics tells you where users drop off; session replay shows you why. Here are the leading session recording and heatmap tools in 2026, compared on session limits, retention and price.

Session Replay & Heatmaps Tools Compared

Tool	Pricing	Free tier
Microsoft Clarity	Free
Fullstory	Free · paid plans by quote
Hotjar	Free · paid from $49/mo
Mouseflow	Free · paid from $25/mo

The Best Session Replay & Heatmaps Tools, Ranked

1. Microsoft Clarity

Free tier· Free

Free session recordings and heatmaps from Microsoft, with no traffic limits, no sampling and no paid tier.

Completely free at any traffic level
Rage-click and dead-click insights out of the box
Two-minute install, works alongside GA

Microsoft Clarity & alternatives

2. Fullstory

Free tier· Free · paid plans by quote

Enterprise digital experience analytics: pixel-accurate replay, auto-captured events and funnels. It is quote-based, with a free tier.

Retroactive analysis: everything is captured, so no tagging plan is needed
Strong search, funnels and frustration signals
Enterprise-grade privacy controls

Fullstory & alternatives

3. Hotjar

Free tier· Free · paid from $49/mo

The best-known heatmap and session recording tool, now sold as part of Contentsquare. Growth starts at $49/month for 7,000 sessions.

Easiest heatmaps and replays for non-technical teams
Surveys and feedback widgets alongside behaviour data
Much larger free plan since the Contentsquare merger

Hotjar & alternatives

4. Mouseflow

Free tier· Free · paid from $25/mo

Session replay, heatmaps, funnels and form analytics on straightforward published tiers, with unlimited seats from $25/month.

Form analytics that Hotjar and Clarity lack
Transparent, published pricing with unlimited seats
Friction scoring surfaces problem sessions automatically

Mouseflow & alternatives

How to choose a session replay & heatmaps tool

Start with Microsoft Clarity. It is free at any traffic level, so a paid tool has to beat it on something specific.
Choose Hotjar for surveys and feedback alongside heatmaps, in a tool non-technical teams can use on day one.
Choose Mouseflow for form analytics and published pricing with unlimited seats.
Choose Fullstory when you need retroactive search and funnels across everything users did, and have an enterprise budget.
Check retention as well as session caps. It decides whether you can compare this quarter with last.

Frequently Asked Questions

What are the best session replay & heatmaps tools for startups in 2026?⌄

The best session replay & heatmaps tools for startups in 2026 include Microsoft Clarity, Fullstory, Hotjar, Mouseflow. Compare them by pricing, free tiers, and features in the list above.

What is the best free session replay & heatmaps tool?⌄

Free session replay & heatmaps options include Microsoft Clarity, Fullstory, Hotjar, Mouseflow — all offer a free tier suitable for bootstrapped startups and MVPs.

How do I choose a session replay & heatmaps 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 session replay & heatmaps?

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

Build my stack free