The Complete SaaS Startup Stack Under $500/Month
Most SaaS startups spend too much on tools too early. You don't need HubSpot Professional at $890/month when you have 3 customers. You don't need Intercom at $74/seat when your support volume is 10 tickets a week. Here's every tool tier from $0 to $500/month — with specific upgrade triggers so you spend money only when the free version is actually holding you back.
The Five Tool Categories Every SaaS Startup Needs
CRM, email, automation, support, and analytics. That's it. Everything else is optional until you have product-market fit and at least 10 paying customers. Project management, design tools, documentation platforms — those matter, but they don't directly drive revenue. This guide focuses on the revenue stack.
CRM Tier: From Spreadsheet to Pipeline
| Tool | Price | Best for | Upgrade when |
|---|---|---|---|
| HubSpot Free CRM | $0 | 0–50 contacts, basic pipeline | Need email sequences or more than 5 templates |
| Pipedrive Lite | $14/seat/mo | Deal-focused teams, visual pipeline | Need workflow automation (Advanced at $39/seat) |
| HubSpot Starter | $20/mo (2 users) | Growth path, marketing + sales | Need reporting or custom objects (Professional at $890/mo) |
Start with HubSpot Free.It handles unlimited contacts, a basic pipeline, and email logging for $0. The first real decision point is email sequences — if you're doing outbound and need automated follow-up, either upgrade to HubSpot Starter ($20/month) or switch to Pipedrive Lite ($14/seat). Pipedrive is more focused on deal management. HubSpot is better if you plan to add marketing later.
Email Tier: Newsletters and Product Updates
| Tool | Price | Best for | Upgrade when |
|---|---|---|---|
| Kit Free | $0 (10K subs) | Product updates, changelog emails | Need automation sequences |
| beehiiv Scale | $39/mo | Newsletter-driven growth, content marketing | Need referral program or paid subscriptions |
| Brevo Free | $0 (300 emails/day) | Transactional + marketing in one | Daily send limit becomes a bottleneck |
The SaaS-specific angle:most SaaS startups need transactional email (password resets, billing notifications) and marketing email (product updates, onboarding sequences). Brevo is the only platform here that handles both in one tool on the free plan. Kit and beehiiv are better for content-driven growth but you'll still need a separate transactional email provider (Resend, Postmark, or AWS SES).
Automation Tier: Connecting the Stack
| Tool | Price | Free tier | Upgrade when |
|---|---|---|---|
| Make Free | $0 | 1,000 operations/mo, 2 active scenarios | Hit operation limit or need 3+ scenarios |
| Zapier Free | $0 | 100 tasks/mo, 5 single-step Zaps | Need multi-step Zaps or more tasks |
| Zapier Starter | $19.99/mo | — | Need filters, paths, or formatting steps |
| Make Core | $9/mo | — | Need more than 10K operations/mo |
Start with Make Free.1,000 operations per month is enough for a startup with under 50 customers. A typical “new signup → add to CRM → send Slack notification” automation uses 3 operations per trigger. At 10 signups per day, that's 900 operations/month. Switch to Make Core at $9/month when you need the headroom.
Support Tier: Handling Customer Questions
| Tool | Price | Best for | Upgrade when |
|---|---|---|---|
| Crisp Free | $0 (2 seats) | Live chat + basic inbox | Need chatbot, knowledge base, or 3+ agents |
| Freshdesk Free | $0 (2 agents) | Ticket management, email support | Need SLA tracking or collision detection |
| Crisp Pro | $25/mo/workspace | Chat + knowledge base + basic CRM | Need automated routing or advanced analytics |
Crisp Free is the default for early-stage SaaS.Live chat widget, shared inbox for 2 team members, and it looks professional. Most startups with under 50 customers handle all support through Crisp Free or just a shared email inbox. Don't buy Intercom at $74/seat/month until your support volume justifies it (100+ conversations per month).
Analytics Tier: Understanding What Users Do
| Tool | Price | Best for | Upgrade when |
|---|---|---|---|
| PostHog Free | $0 (1M events/mo) | Product analytics, funnels, session replay | Exceed 1M events or need group analytics |
| Plausible | $9/mo | Privacy-first web analytics | Need product analytics (funnels, cohorts) |
| Mixpanel Free | $0 (20M events/mo) | Event-based product analytics | Need advanced user segmentation or data governance |
PostHog Free is the best starting point for SaaS. 1 million events per month covers most startups through their first 1,000 users. It includes product analytics, session recording, feature flags, and A/B testing. Add Plausible at $9/month for marketing site analytics if you want something cleaner than Google Analytics and care about visitor privacy.
Full Stack Costs: $0 to $500/Month
| Category | $0 Stack | $100/mo Stack | $300/mo Stack | $500/mo Stack |
|---|---|---|---|---|
| CRM | HubSpot Free ($0) | Pipedrive Lite ($14) | Pipedrive Growth ($39) | HubSpot Starter ($20) + 3 seats |
| Kit Free ($0) | beehiiv Scale ($39) | beehiiv Scale ($39) | beehiiv Max ($99) | |
| Automation | Make Free ($0) | Make Core ($9) | Zapier Starter ($19.99) | Zapier Professional ($49) |
| Support | Crisp Free ($0) | Crisp Free ($0) | Crisp Pro ($25) | Freshdesk Growth ($15/agent × 3) |
| Analytics | PostHog Free ($0) | PostHog Free + Plausible ($9) | PostHog Free + Plausible ($9) | PostHog Free + Plausible ($9) |
| Total | $0/mo | $71/mo | $132/mo | $282/mo |
The $0 stack is genuinely usable. HubSpot Free CRM + Kit Free email + Make Free automation + Crisp Free chat + PostHog Free analytics. It covers every essential function for a SaaS startup with under 50 customers. The $100/month stack upgrades the tools that matter most (CRM pipeline management and email for growth). The $300/month stack adds automation depth and proper support tooling.
What to Skip Until You Have 10+ Customers
- Intercom or Zendesk. $74/seat/month for Intercom. $55/agent/month for Zendesk. Both are built for teams with dedicated support staff. Until you're handling 100+ conversations per month, Crisp Free or a shared inbox works.
- HubSpot Marketing Hub Professional. $890/month is indefensible before product-market fit. The free CRM plus a separate email tool gives you 90% of the value at 5% of the cost.
- Salesforce (any edition). $25–$300/user/month. Requires an admin. Implementation takes weeks. Zero value until you have a sales team of 5+ with complex pipeline reporting needs.
- Amplitude or Mixpanel paid plans. PostHog Free gives you 1 million events. Mixpanel Free gives 20 million events. You won't need paid product analytics until you have thousands of active users generating complex behavioral patterns.
- Dedicated customer success platforms. Gainsight, Vitally, Totango — none of these are relevant until you have 50+ accounts with dedicated CSMs. A spreadsheet tracking account health scores works until then.
When to Upgrade Each Tool: Specific Triggers
CRM: Upgrade from HubSpot Free when...
You need email sequences for outbound sales (more than manual follow-ups), you have 2+ people needing CRM access with different permission levels, or you're managing more than 3 active deal pipelines.
Email: Upgrade from Kit Free when...
You need automated welcome sequences, your email list is growing and you want segmentation beyond basic tags, or you need A/B testing on subject lines to improve open rates.
Automation: Upgrade from Make Free when...
You're hitting the 1,000 operations/month limit, you need more than 2 active scenarios, or you need scheduling intervals shorter than 15 minutes.
Support: Upgrade from Crisp Free when...
You need a third team member in the inbox, you want a chatbot for common questions, or you need a public knowledge base to deflect repetitive tickets.
Analytics: Upgrade from PostHog Free when...
You exceed 1 million events/month, you need group-level analytics (company accounts, not just individual users), or you need SQL access to raw event data.
Who Should NOT Use This Guide
- Enterprise SaaS selling to Fortune 500. You need Salesforce, a dedicated Marketo or HubSpot Enterprise instance, and your tooling budget is a rounding error on your revenue. This guide is for startups where $500/month matters.
- Funded startups with dedicated ops teams. If you have a RevOps hire, they should be building your stack based on your specific GTM motion. This guide is for founders doing it themselves.
- Product-led growth SaaS with complex onboarding. PLG requires in-app messaging (Appcues, Userflow), advanced product analytics (Amplitude), and often a dedicated data warehouse. This guide covers the basics, not the PLG-specific stack.
Common Mistakes
- Buying annual plans before product-market fit.Annual plans save 15–20% but lock you in for 12 months. If you pivot (and most startups do), you're paying for tools that no longer fit. Stay monthly until your stack is stable for 3+ months.
- Choosing tools for the team you plan to have, not the team you have.A 2-person startup doesn't need per-seat pricing optimized for 10 people. Buy for today, plan for 6 months out. Not 2 years.
- Using the CRM as your email tool. HubSpot and Pipedrive both offer email features, but their email marketing is mediocre compared to dedicated email platforms. Use the CRM for contact and deal management. Use a real email platform for newsletters and sequences.
- Building complex automations before building the process.Run the process manually 20 times before automating it. You'll discover edge cases that would break your automation. A broken automation is worse than no automation.
- Adding analytics before knowing what to measure. PostHog Free is generous, but instrumenting 50 events before you know which metrics matter creates data noise. Start with 5 key events: signup, activation, feature usage (core), upgrade, and churn.
The Bottom Line
A $0/month stack of HubSpot Free + Kit Free + Make Free + Crisp Free + PostHog Free covers every essential SaaS startup function. Upgrade incrementally as specific bottlenecks appear, not because a vendor told you to. The $100/month stack handles most startups through their first 100 customers. The $300/month stack adds the automation and support depth needed for 100–500 customers. You rarely need to spend $500/month on tools before you're generating $10K+ MRR.
Frequently Asked Questions
What tools does a SaaS startup actually need?
Five categories: CRM (contact and deal management), email (newsletters and product updates), automation (connecting tools), support (customer questions), and analytics (user behavior). Everything else is optional until you have product-market fit.
Is HubSpot Free really free?
Yes, HubSpot Free CRM is genuinely free with unlimited contacts and basic pipeline management. The limitations that matter: only 5 email templates, no email sequences, no custom reporting, and HubSpot branding on forms and chat. For most startups with under 50 customers, these limits are not blockers.
Should I use Zapier or Make for a startup?
Start with Make Free (1,000 operations/month). It's more cost-effective than Zapier at every tier and handles complex multi-step automations better. Switch to Zapier only if you need a specific integration that Make doesn't support (Zapier has 6,000+ integrations vs Make's 1,500+).
When should a startup switch from free tools to paid?
When a free tier limitation is directly costing you revenue or time worth more than the paid plan. If you're spending 2 hours/week on manual tasks that a $20/month tool automates, pay for the tool. If the free tier works, there's no reason to upgrade.