Every week, a founder asks me the same question.
"We're at 30k users, pre-Series A. What CRM should we use?"
And every week, I give the same answer: it depends on what you actually need to solve right now.
Most startups over-invest in CRM tools way too early. They buy enterprise software before they've even defined their activation flow. They set up complex automation before they know what a qualified lead looks like. Then they wonder why nothing works.
After 10 years building CRM stacks across gaming, fintech, e-commerce and SaaS, here's what I'd recommend at each stage.
Quick comparison table
| Startup stage | Recommended CRM | Best for |
|---|---|---|
| 0 to 10k users | Customer.io | Early-stage SaaS, mobile apps |
| 10k to 100k users | Klaviyo | E-commerce, D2C |
| 10k to 100k users | HubSpot Marketing Hub | B2B SaaS |
| 100k+ users | Braze | High-volume mobile and web |
| All stages | Segment (CDP) | Data unification |
The golden rule before picking any CRM tool
Before choosing your stack, answer these three questions honestly.
What is your primary channel to reach users? Email, push, in-app, SMS? Do you have someone technical who can handle the setup and maintain it over time? What's your monthly active user base right now?
Your answers will determine everything. A tool that's perfect for a B2B SaaS with 5k users is completely wrong for a mobile app with 500k installs.
Stage 1 — 0 to 10k users: Keep it simple
At this stage, you don't need a sophisticated CRM. You need speed and learning.
Customer.io is the right choice here. It's affordable, flexible, and connects easily to your product data via API or Segment. You can build behavioral email flows without an engineering team.
What to avoid. Don't touch Braze or Iterable yet. The implementation cost, both in time and money, will kill your momentum. Most startups that contact me are overbuilt and underactivated. Start simple. Complexity comes later.
Stage 2 — 10k to 100k users: Add segmentation and multichannel
Klaviyo is the go-to for e-commerce and D2C brands at this stage. For mobile-first products, OneSignal handles push notifications at a very competitive price. If you're B2B SaaS, HubSpot's Marketing Hub starts to make sense here.
What to add. This is the stage where you need a CDP to unify your data. Segment is the standard choice. It's not cheap, but it will save you months of engineering work.
Stage 3 — 100k+ users: Go enterprise
Braze is the industry standard for high-volume mobile and web products. The canvas builder is incredibly powerful, the personalization capabilities are best-in-class, and the AI features are genuinely useful, not just marketing fluff.
SaaS vs E-commerce vs Mobile: the stack differs
SaaS startups need Customer.io or HubSpot for email lifecycle, Intercom for in-app guidance, and Mixpanel for behavioral analytics.
E-commerce startups need Klaviyo. Its revenue attribution and abandoned cart flows are best in class.
Mobile app startups need to focus on D1, D3, D7, D30 retention. OneSignal at early stage, Braze at scale. Amplitude is essential for retention cohort analysis.
How much should a startup spend on CRM?
At 0 to 10k users, you should be under €500/month. At 10k to 100k users, expect €500 to €3,000/month. At 100k+ users, enterprise contracts typically start at €30k to €50k/year for Braze.
5 CRM stack mistakes startups make
Buying enterprise CRM software too early. Braze at 5k users is like buying a Formula 1 car to commute.
Tracking everything and understanding nothing. Define your activation metric before you instrument anything.
No activation strategy. The tool is not the strategy. Strategy first, always.
No CRM owner. CRM software needs someone accountable for it every single day.
No retention KPI. If you can't tell me your D7 retention rate, you don't have a CRM program. You have a newsletter.