Build Your Startup Stack for $0: The 2026 Guide
The exact free-plan stack I would set up on day one, with the real limits of each plan and the moment each one starts costing money.
You have an idea, a domain name, and not much else. The last thing you need is a $500 a month software bill before your first customer signs up.
In 2026 you can run a real business on free plans. Not on hacks or half-built tools, but on products that thousands of paying companies also use. The catch is that every free plan has one number that eventually forces you to pay, and vendors are not keen on telling you which one.
So this guide does two things for every category. It names the tool I would set up today, and it names the exact limit that ends the free ride. Every number below comes from the freestack.tools directory, where I re-check each plan against the vendor's own pricing page. Where a limit changed recently, I say so.
Project management
My pick: Linear. The free plan has unlimited members and unlimited issues, which is rare. Most competitors cap seats first. What Linear caps instead is file storage, at 250MB across the workspace, and a few power features like SLAs and advanced insights.
The limit that gets you: storage, if your team attaches screenshots to every issue. Most early teams never hit it.
If not Linear: Trello gives you unlimited members and cards but only 10 boards per workspace. Plane is open source and unlimited when you self-host it, if you would rather own the data.
CRM
My pick: HubSpot CRM. Unlimited users and unlimited contacts on the free plan. Deal pipelines, email tracking, meeting links, and basic reporting are all included. That is the most generous free CRM by a wide margin.
The limit that gets you: not contacts, but automation. Sequences, workflows, and custom reporting are paid, and HubSpot branding sits on the free email and forms. When you need a follow-up sequence that runs by itself, you are looking at the Starter plan.
If not HubSpot: Folk is cleaner and faster but stops at 100 contacts on free. Twenty is an open source CRM with unlimited contacts if you host it yourself. Attio gives you 3 seats.
If you want a deeper comparison of these CRMs from a sales-team angle, Revenue Directory reviews go-to-market software specifically.
Email marketing
My pick: Brevo. 300 emails a day, and you can hold 100,000 contacts without paying. That shape suits a startup, because your list grows long before your send volume does. A weekly newsletter to 1,000 people fits with room to spare.
The limit that gets you: the daily cap. 300 a day means a single send to 2,000 people takes a week. The moment you want to blast the whole list at once, you pay.
If not Brevo: MailerLite has the nicer editor and real automations on free, but the cap dropped from 1,000 to 500 subscribers in September 2025. Loops is built for SaaS onboarding email: 1,000 contacts and 4,000 sends a month. Kit lets you keep 10,000 subscribers free but only one visual automation.
Analytics
My pick: Umami. The cloud free plan covers 3 websites and 100,000 events a month, with 6 months of data retention. No cookie banner needed. Or self-host it and the limits disappear.
The limit that gets you: retention, if you want year-over-year comparisons. 100,000 events is roughly 30,000 to 50,000 monthly visits, which is more than most startups see in year one.
If not Umami: PostHog is the pick when you want product analytics, session replay, and feature flags in one place: 1 million events and 5,000 recordings a month free. Microsoft Clarity gives you heatmaps and recordings with no traffic cap at all. Plausible is only free if you self-host; the cloud version is trial only.
Customer support
My pick: Tawk.to. Unlimited agents, unlimited chat history, a ticketing system and a knowledge base, all free. Tawk.to makes its money on optional add-ons, so the core product is not a trial in disguise.
The limit that gets you: the branding. The widget says "Powered by tawk.to" unless you pay $19 a month to remove it. That is the whole business model.
If not Tawk.to: Crisp has a much nicer interface but stops at 2 agent seats and has no chatbot on free. Chatwoot is open source with unlimited agents if you self-host. Tidio caps you at 50 conversations a month.
Accounting and invoicing
My pick: Wave. Unlimited invoicing, bookkeeping, and receipt scanning at no cost. Wave earns from payment processing fees and payroll, so the accounting itself stays free.
The limit that gets you: none on the software. You pay per transaction when a customer pays an invoice by card, and payroll is a paid add-on.
If not Wave: ZipBooks has a free plan with unlimited invoicing but one user and one bank connection. Akaunting is open source and unlimited when self-hosted, though some modules are paid.
Team communication
My pick: Slack. Yes, the free plan. You get channels, DMs, file sharing, and up to 10 app integrations. The one real restriction is 90 days of message history.
The limit that gets you: history. On day 91, your earliest decisions vanish from search. Small teams cope with this by keeping decisions in Linear or Notion, not in chat.
If not Slack: Mattermost and Rocket.Chat are both self-hosted and unlimited, including history. Element runs on the open Matrix protocol. All three trade Slack's polish for full ownership.
Design
My pick: Figma. The free plan gives you 3 Figma design files and 3 FigJam boards, plus unlimited personal drafts. Three files sounds tight, but a landing page, a product UI file, and a brand file is exactly what a startup needs at the start.
The limit that gets you: the file count and 30-day version history. When you want a fourth shared file, you pay per editor.
If not Figma: Penpot is open source with unlimited projects and files. Canva is the pick for non-designers making social posts and decks: unlimited designs, with a watermark on some premium elements.
Forms and scheduling
Two categories people forget until they need them.
Forms: Tally. Unlimited forms and unlimited responses on free. Compare that to Typeform, which gives you 10 responses a month. Fillout is the runner-up at 1,000 responses a month with unlimited seats.
Scheduling: Cal.com. The individual plan is free and the whole thing is open source. It replaces Calendly for one person with no expiry.
The complete $0 stack
| Category | Tool | What is free | The limit that ends it |
|---|---|---|---|
| Project management | Linear | Unlimited members and issues | 250MB storage |
| CRM | HubSpot CRM | Unlimited users and contacts | Automation and sequences are paid |
| Email marketing | Brevo | 100,000 contacts | 300 emails a day |
| Analytics | Umami | 3 sites, 100K events a month | 6 months retention |
| Customer support | Tawk.to | Unlimited agents and history | Branding removal costs $19 a month |
| Accounting | Wave | Unlimited invoicing and books | Card processing fees, paid payroll |
| Communication | Slack | Channels, 10 integrations | 90 days of history |
| Design | Figma | 3 files, 3 FigJam boards | The fourth file |
| Forms | Tally | Unlimited forms and responses | Custom domain is paid |
| Scheduling | Cal.com | Free for individuals | Team features |
Total monthly cost: $0. The first thing most teams end up paying for is email sending volume, usually somewhere between 2,000 and 5,000 subscribers.
When to start paying
The goal is not to stay free forever. The goal is to avoid paying before you need to. Four signals that it is time:
- You are working around a limit every week. If you queue Brevo sends over three days or prune Slack history by hand, the friction now costs more than the plan.
- You have revenue. Paying customers change the maths. A $20 tool that helps you keep one customer pays for itself.
- A paid feature has an obvious return. If a HubSpot sequence would save you five hours of manual follow-up a week, buy it.
- You are hiring. Some free plans cap seats. Add tool costs to each hire's budget so nobody is surprised.
If you want the per-tool version of this, every tool page on freestack.tools has a "when to upgrade" section that names the specific limit and the plan that lifts it.
One last thing
Do not spend a week comparing fifteen project management tools. Pick one from each row above, set it up in an afternoon, and get back to the work that matters: building the product and finding customers.
The best stack is the one you actually use. Start free, upgrade when a limit bites.
Looking for more free tools?
Browse our directory of free tools to find the perfect stack for your startup.