Guides for SaaS builders

What does "default alive" mean for a startup?

What "default alive" and "default dead" mean, how to calculate which one you are, and why it is the most important question for an early-stage founder.

Startkeel vs a spreadsheet: which should you use for your SaaS model?

An honest comparison of building your SaaS financial model in a spreadsheet versus using Startkeel — control and flexibility vs speed, benchmarks and a viability verdict.

How much runway should a pre-seed SaaS have?

How many months of runway a pre-seed SaaS should target, why under 12 months is risky, and how to extend runway before you raise.

When is a runway calculator the wrong tool?

An honest look at the limits of a runway calculator — variable costs, no revenue, no unit economics — and what to use instead for decisions that matter.

Startkeel vs ChatGPT: should you model your SaaS in an LLM?

Can you build your SaaS financial model with ChatGPT? Where it helps, where it fails (hallucinated numbers, no benchmarks), and when a deterministic tool is worth it.

Startkeel vs Causal & Runway for early-stage SaaS

Causal and Runway are powerful FP&A tools — but priced and built for funded teams. How they compare to Startkeel for a bootstrapped, pre-seed SaaS founder.

How much does a SaaS financial model cost?

What a startup financial model actually costs in 2026 — from free spreadsheet templates to fractional CFOs — and how to choose for your stage.

Will my startup run out of money?

A plain-English way to figure out if (and when) your startup runs out of money — no finance background needed. Plus a free calculator to get your number, no signup.

Can I afford to quit my job for my startup?

How to know if your side project is ready to go full-time — in plain terms. The two numbers that actually decide it, and a free tool to check yours.

How do I know if my business will survive?

A plain-English checklist to tell if your startup will make it: the few numbers that decide survival, what is healthy, and a free score that checks them for you.

Is my SaaS actually making money?

Revenue is not profit. A plain-English way to tell if your SaaS really makes money once you subtract the real costs — and a free tool to see your true picture.

How much money do I need to start a SaaS?

How much cash (or savings) you really need to start a SaaS, in plain terms: the simple formula, why 12-18 months is the usual target, and a free tool to size yours.

Am I charging too little for my SaaS?

Most SaaS founders underprice. The plain-English signs you charge too little, the two numbers that prove it, and a free tool to check before you raise your price.

Can I afford to hire my first employee?

A plain-English way to know if your startup can afford its first hire — what it really costs, how it eats your runway, and how to check before you commit.

Should I give up on my startup?

Torn between quitting and pushing on? Before it is an emotional call, make it a numbers one: how much runway you have, whether break-even is reachable, and what one change would flip it.

Startup finances for non-finance founders

You do not need an accounting degree to know if your startup works. The handful of numbers that actually matter — runway, break-even, default-alive — in plain English.

How much can I pay myself in my startup?

Your own salary is a real cost that eats your runway. A plain-English way to decide how much you can pay yourself without pushing your startup default-dead — and a free tool to check.

Am I spending too much on my startup?

There is no absolute "too much" — spending is only too high relative to your runway and what it produces. The plain-English signs, the two numbers that decide it, and a free tool to check.

Do you need an AI CFO agent?

AI CFO agents are everywhere in 2026. Most early-stage startups do not need one. Here is why an autonomous agent on your money is risky, and what you actually need instead.

Do you need a financial model to raise pre-seed?

Whether you need a financial model to raise a pre-seed round, why the real reason is for you (not the investor), what to include, and how to build one fast without a finance degree.

Looking for a Finmark alternative? Here is an honest one.

BILL sunset Finmark on 1 April 2026 with no replacement. Your options — full-FP&A tools vs a one-time viability model when you just need the verdict.

Causal alternative: what to use now that Causal is enterprise

Causal joined Lucanet and became an enterprise xP&A tool. An honest, focused alternative for modeling your startup runway and viability.

Why do startups fail?

Most startups fail for a short list of reasons, and running out of cash sits behind most of them. What actually kills startups — and how to see it coming.

When does a SaaS become profitable?

When a SaaS starts making money: what break-even really means, what drives the timing, and how to find the month your revenue covers your costs.

Are you ready to raise a round? A pre-fundraise checklist

A 7-point self-assessment to tell if your SaaS is ready to raise a round — runway, default-alive, unit economics, retention, margin and credible growth, with the healthy threshold for each.

Why does AI get my numbers wrong?

An AI will not tell you it does not know a number. It will read the one you gave it. The failure mode we hit calibrating our own engine, and the one-line rule that fixes it.

How much cash should a startup keep in the bank?

Why the personal-finance "3-6 months of expenses" rule does not fit a startup, what cash cushion actually matters (runway to your next milestone), and how to size it.

Logo churn vs revenue churn: what's the difference?

The difference between logo churn, revenue churn and net revenue retention — and the monthly-vs-annual mistake that makes a bleeding SaaS look healthy against a benchmark.

LTV:CAC for PLG vs sales-led: why your CAC is probably wrong

The LTV:CAC benchmark is 3 or higher — but CAC means different things in product-led vs sales-led SaaS. Leaving sales salaries out makes your CAC look low and your ratio inflated.

Why 'just reduce your churn' is the wrong advice

The most common SaaS advice — reduce churn — is often the least useful. Some churn is structural to a low-ARPA SMB product. How to tell fixable churn from structural, and what to grow instead.

How much should I charge for my SaaS?

Most SaaS pricing advice tells you to copy Slack or Notion — companies nothing like you. How to price against builders your own size, using your churn, ARPA and acquisition cost.

Is my price enough to fund my plan?

A price can survive and still be too low to grow. How to tell if your SaaS price funds your plan — margin, reinvestment, and what to do when the market pays less than you need.

Will a low price kill my SaaS?

A low price feels safe but often kills a SaaS through churn — unless you have the PLG machine behind it. How the death spiral works and how to see it on your own numbers before you launch it.

Which pricing model should I use for my product?

Subscription, one-time, lifetime or usage-based — the model is not a copy-the-competitor decision, it is a survival one. How to pick the model your product’s cost shape can carry.