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.

E-SignatureFree tier

DocuSeal: Pricing, Features & Alternatives

Name: App Stack Builder
Availability: InStock

DocuSeal is an open-source platform for filling and signing documents, licensed AGPL-3.0 with additional terms, with about 18,900 GitHub stars. You build a form on top of a PDF, send it, and signers complete it from any device. The self-hosted Open Source edition is free with unlimited signature requests sent through your own SMTP server, plus webhooks and a basic signing API. Developers mainly pick it for the embeddable signing form and builder, which drop into a React, Vue or plain JavaScript app.

The cloud Basic plan is free for 10 signature requests a month, without API access. Pro is $20 per user per month ($200 per user a year) with unlimited signature requests, SMS, bulk send, payment collection and custom branding; on-premises Pro is $20 per user per month and adds SAML SSO and white-labelling. API and embedded signing need at least one Pro seat and cost $0.20 per completed document, with a free sandbox. As of October 2026.

DocuSeal Pricing Plans (2026)

Plan	Price	Highlights
Open Source (self-hosted)	Free (AGPL-3.0)	Unlimited signature requests via your own SMTP · Webhooks · Basic signing API
Cloud Basic	Free	10 signature requests a month · No API or webhooks · 4% fee on collected payments
ProPopular	$20 / user / month	Unlimited signature requests · SMS and bulk send · Payment collection
API & embedding	$0.20 per signed document	Requires one Pro seat · Embeddable signing form and builder · Free sandbox

Pricing summary: Free · paid from $20/user/mo. Always confirm current pricing on the official site.

Key DocuSeal Features

Unlimited signature requests
SMS and bulk send
Payment collection
Custom branding

Pros

+Free self-hosted edition with unlimited signing
+Embeddable signing components for your own app
+Per-document API pricing with no monthly minimum beyond one seat

Cons

−AGPL licence with additional terms
−SSO and white-label need Pro
−Free cloud plan has no API

Best DocuSeal Alternatives

Compare all

Documenso

Free · paid from $25/mo

Docusign

From $11/mo

Dropbox Sign

From $15/mo

DocuSeal Compared

DocuSeal vs Documenso DocuSeal vs Docusign DocuSeal vs Dropbox Sign

DocuSeal FAQ

What is DocuSeal used for?⌄

DocuSeal is a e-signature tool. Open-source document signing (AGPL-3.0) with a free self-hosted edition, a $20 per user cloud plan, and an embeddable signing API at $0.20 per completed document.

Is DocuSeal free?⌄

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

How much does DocuSeal cost?⌄

DocuSeal offers a free tier, with paid plans starting at $20/month. Some plans are usage-based (pay-as-you-go).

What are the best DocuSeal alternatives?⌄

Popular DocuSeal alternatives include Documenso, Docusign, Dropbox Sign. Compare pricing and features on our DocuSeal alternatives page.