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.

PDF & Documents

Best PDF & Documents Tools for Startups in 2026

Compare the best pdf & documents tools for startups and developers in 2026. We’ve rounded up 9 options with pricing, free tiers, and features side by side so you can pick the right fit for your stack and budget.

PDF & Documents Tools Compared

Tool	Pricing	Free tier
iLovePDFs	Free
Stirling PDF	Free
PandaDoc	Free · paid from $19/mo
PDF24 Tools	Free
Smallpdf	Free · paid from $9/mo
Adobe Acrobat Pro	From $14.99/mo	—
Docusign	From $10/mo	—
Foxit PDF Editor	From $10.99/mo	—
Proposify	From $19/mo	—

The Best PDF & Documents Tools, Ranked

1. iLovePDFs

Free tier· Free

Free online PDF toolkit — convert, edit, compress, merge, split, and secure PDF files instantly, no software needed.

Completely free with no signup needed
Covers all common PDF operations
Browser-based — no install required

iLovePDFs & alternatives

2. Stirling PDF

Free tier· Free

Open-source, self-hostable PDF toolkit — run 50+ PDF operations locally so files never leave your server.

Open-source & self-hosted
Total data privacy
Huge feature set

Stirling PDF & alternatives

3. PandaDoc

Free tier· Free · paid from $19/mo

All-in-one document automation — build proposals, quotes, and contracts with templates, pricing tables, e-signatures, and payments.

Free unlimited e-signature plan
Strong proposal and quote builder
CRM integrations and payment collection

PandaDoc & alternatives

4. PDF24 Tools

Free tier· Free

Completely free PDF toolkit with 30+ tools online and an offline desktop app — no sign-up required.

Genuinely free, no limits
Offline desktop app for privacy
Huge range of tools

PDF24 Tools & alternatives

5. Smallpdf

Free tier· Free · paid from $9/mo

Popular online PDF suite — convert, compress, merge, edit, sign, and e-sign documents in the browser.

Clean, easy-to-use interface
Wide range of PDF tools
E-signature support

Smallpdf & alternatives

6. Adobe Acrobat Pro

· From $14.99/mo

The industry-standard PDF editor — create, edit, convert, e-sign, redact, and collaborate on documents, now with an AI Assistant.

Industry-standard, universally compatible
Most complete PDF feature set
Strong redaction and compliance tools

Adobe Acrobat Pro & alternatives

7. Docusign

· From $10/mo

The most recognized e-signature platform — send, sign, and manage agreements securely, with AI-powered agreement management.

Most recognized and trusted e-signature brand
Legally binding and audit-ready
Huge integration ecosystem

Docusign & alternatives

8. Foxit PDF Editor

· From $10.99/mo

A fast, full-featured PDF editor at roughly half the price of Adobe — edit, convert, sign, and redact with built-in AI.

About half the cost of Adobe Acrobat
Full professional PDF feature set
Cross-platform with mobile access

Foxit PDF Editor & alternatives

9. Proposify

· From $19/mo

Proposal software for sales teams — design on-brand proposals with templates, pricing tables, e-signatures, and approval workflows.

Designer-grade, on-brand proposals
Strong template and content governance
Viewer engagement analytics

Proposify & alternatives

How to choose a pdf & documents tool

Start with tools that offer a free tier to validate before you pay.
Match the tool to your team size and skill level.
Compare pricing as you scale — watch for per-seat or usage-based costs.
Prefer tools that integrate cleanly with the rest of your stack.

Frequently Asked Questions

What are the best pdf & documents tools for startups in 2026?⌄

The best pdf & documents tools for startups in 2026 include iLovePDFs, Stirling PDF, PandaDoc, PDF24 Tools, Smallpdf. Compare them by pricing, free tiers, and features in the list above.

What is the best free pdf & documents tool?⌄

Free pdf & documents options include iLovePDFs, Stirling PDF, PandaDoc, PDF24 Tools — all offer a free tier suitable for bootstrapped startups and MVPs.

How do I choose a pdf & documents 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 pdf & documents?

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

Build my stack free