# Stacks — CRM, Invoicing, Scheduling & Email in One Free Platform > Stacks is one platform that replaces your CRM, email marketing, reviews, invoicing, scheduling, and support tools. Free forever, unlimited users — no per-user fees. Upgrade to AI Pro for AI features + priority support. Markdown version of https://stackscrm.com/ — append `.md` to any page URL on this site (homepage: https://stackscrm.com/index.md). Index: https://stackscrm.com/llms.txt · Full site in one file: https://stackscrm.com/llms-full.txt --- NEW One platform · seven tools · $0 # Every tool your business runs on. One platform. Actually free. *For real.* Stacks replaces your CRM, email marketing, reviews, invoicing, scheduling, support desk, and time tracking — in one simple platform. Free forever. Upgrade for AI features and support when you're ready. [Start free →](https://stackscrm.com/register) [Take the tour](https://stackscrm.com/tour) ✓ No credit card · ✓ Unlimited users, no per-user fees · **Free forever** #### Common business workflows CRMContacts and deals EmailCampaigns ReviewsCustomer feedback InvoicingInvoices and payments SchedulingBookings SupportTickets TasksFollow-ups and time Compare your actual subscriptions — [calculate your costs](https://stackscrm.com/compare#calculator) → FREE FOREVER Stacks $0 per month · unlimited users - All seven tools included - One shared customer record - No per-user fees, ever One login instead of seven ## Everything your business needs, finally in one place Each of these is a full product on its own. Together, they share one contact list, one inbox, one login — and they all talk to each other. ### Sales CRM Pipeline, deals & contacts. **Replaces Pipedrive, HubSpot, Zoho** ### Email Marketing Campaigns, sequences & lists. **Replaces Mailchimp, Klaviyo** ### Reviews Collect & manage reputation. **Replaces Podium, Birdeye** ### Invoicing Invoices, estimates & payments. **Replaces FreshBooks, Zoho** ### Scheduling Bookings & availability. **Replaces Calendly, Acuity** ### Support Desk Tickets & help center. **Replaces Intercom, Freshdesk** ### Tasks & Time To-dos & time tracking. **Replaces Productive, Toggl** ### All connected. One contact record, seven lenses. A lead becomes a customer becomes an invoice — without re-typing anything. ML Maria Lopez Bloom Salon & Spa LEAD → CUSTOMER → REGULAR 💰 **$2,400** deal won · invoice paid 📅 Next appointment **Tue 10:30** ⭐ Left a **5-star** Google review CRMDeal won EmailOpened 3 campaigns InvoicingPaid $2,400 Scheduling12 bookings Reviews★★★★★ Support0 open tickets TasksFollow-up done ✓ One shared record ## Meet Maria. Every tool already knows her. In a normal business, Maria lives in seven databases that don't talk. In Stacks, she's **one record** — and every module is just a different lens on it. - ✓**No re-typing, no syncing.** Win the deal and the invoice, booking and follow-up already know who she is. - ✓**Nothing falls through the cracks.** Her emails, payments, appointments and tickets share one timeline. - ✓**Context everywhere.** Pull up Maria from any module and see the whole relationship, not a fragment. [Take the full tour — follow Maria through every tool →](https://stackscrm.com/tour) Do the math ## What does your current setup cost? Compare the tools you use, your own seat counts and the prices you actually pay. Stacks subscription prices stay separate from email, SMS and payment-provider costs. [Compare your costs →](https://stackscrm.com/compare#calculator) CRM shopping? See [HubSpot Free](https://stackscrm.com/alternatives/hubspot-free) and [Pipedrive](https://stackscrm.com/alternatives/pipedrive) alternatives. ✦ Included in AI Pro ## Meet the AI teammate that never clocks out ✓ **Writes your emails & follow-ups** — on-brand, in seconds. ✓ **Scores & prioritizes leads** — so you call the right ones first. ✓ **Drafts review replies** — responds to every customer, fast. ✓ **Reads invoices & receipts** — turns a photo into a record. ✓ **Answers questions about your numbers** — just ask. Draft a friendly follow-up to Dana about the roofing estimate. **Hi Dana!** Just following up on the estimate we sent Tuesday — happy to walk through the options whenever works. Want me to hold your preferred start date? 🙂 ✦ Drafted by Stacks AI · ready to send Simple pricing ## Free forever. AI Pro when you're ready. No trials, no credit card, and **no per-user fees — ever**. The whole platform is free; AI Pro adds AI features and priority support. ### Free $0/ forever Everything a small business needs to run. - All 7 modules, unlimited - **Unlimited users** — no per-user fees - Your own subdomain - Contacts, deals, invoices & bookings - Email marketing & reviews [Start free](https://stackscrm.com/register) ### AI Pro $99/ mo or $995/year (~16% off) · still unlimited users · everything in Free, supercharged. - **AI** across every module - Priority support - Submit & vote on feature requests - Early access to new tools [Upgrade to AI Pro →](https://stackscrm.com/register?intent=support) **Coming soon — Agentic.** Autonomous agents that do the work for you, not just help you do it. [Join the waitlist →](mailto:support@stackscrm.com?subject=Agentic%20waitlist) Grow with us ## Outgrow Stacks? We'll build you a custom version. We can extend Stacks with specialized workflows, data attributes and integrations. Discovery defines the implementation, migration needs and ongoing maintenance before work begins. [Talk to us →](https://stackscrm.com/custom) Questions ## The obvious questions, answered Yes — really. The full platform, all seven tools, with **unlimited users**, is free forever. We only make money when you choose **AI Pro** (for AI features + priority support) or ask us to build you a **custom version**. No ads, no selling your data, no per-user fees. [Read the full story: Why is Stacks free? →](https://stackscrm.com/blog/why-is-stacks-free) Correct. Add your whole team — 3 people or 300 — at **no extra cost**. Per-user pricing is the single biggest way tools like Pipedrive, Calendly and Intercom quietly run up your bill. We don't do it. Yes — importing your contacts takes minutes. Upload a CSV (Pipedrive, Mailchimp and nearly every tool can export one) and Stacks **auto-matches the columns** for you, then brings your contacts and companies straight in. You can export your contacts back out anytime — your data is always yours. Everything in Free, plus **AI across every module** (drafting emails, scoring leads, replying to reviews, reading invoices, answering questions about your numbers), **priority support**, and the ability to submit and vote on feature requests — $99/mo or $995/yr, still unlimited users. AI Pro turns on an AI teammate across every module: - **Writes your emails & follow-ups** — on-brand, in seconds - **Scores & prioritizes leads** — so you call the right ones first - **Drafts review replies** — responds to every customer, fast - **Reads invoices & receipts** — turns a photo into a record - **Answers questions about your numbers** — just ask - *More coming soon.* Our team can extend Stacks or build an integration for specialized work. Discovery defines scope, migration, training and maintenance. [Discuss your workflow](https://stackscrm.com/custom). Guides & how-tos ## Explore everything Stacks can do Short, practical guides for setting up and getting the most out of every feature. [Import your contacts →](https://stackscrm.com/features/import-contacts) [Send an email campaign →](https://stackscrm.com/features) [Request customer reviews →](https://stackscrm.com/features) [Create & send invoices →](https://stackscrm.com/features) [Set your availability →](https://stackscrm.com/features) [Open support tickets →](https://stackscrm.com/features) [Track & bill your time →](https://stackscrm.com/features) [Turn on AI features →](https://stackscrm.com/features) [Build an automation →](https://stackscrm.com/features) [Browse all feature guides →](https://stackscrm.com/features) ## One platform. Every tool. Free. Every tool your business runs on, free forever — unlimited users, no per-user fees. [Start free →](https://stackscrm.com/register)