After 8 years of SaaS, I finally built the cash flow tool I wish existed
I’ve been running Huntr, a B2C job tracker and resume builder tool for job seekers, for over 8 years. We’re a small team (6 people), currently at high six figure ARR.
For most of that time, I’ve been trying to answer one question: given my current metrics, when do I run out of money?
Sounds simple. It’s not.
The problem
There are plenty of MRR forecasting tools. Plug in your churn, new customers, ARPU; they’ll show you where your revenue is headed.
There are plenty of cash flow tools. Enter your expenses, payroll, one-time costs; they’ll show you your burn.
The thing is these NEED to be the same chart.
Your runway isn’t just about expenses. It’s about how your SaaS metrics interact with your expenses over time. If acquisition drops today, your MRR doesn’t drop today; it bleeds out over months (or years, depending on churn). A cash flow tool that treats revenue as a static input is lying to you about when you hit zero.
I couldn’t find anything that merged SaaS revenue forecasting with cash flow management in one place. So I kept maintaining a spreadsheet that tried to do both. It was fragile, slow, and I hated touching it.
What I built
A cashflow and runway forecasting tool for SaaS. Airstrip lets you enter your SaaS metrics; new customers/month, churn rate, ARPU and it handles the MRR forecast automatically, including the lag time to reach steady-state revenue.
Then you layer in everything else: employees (with salaries and start/end dates), recurring expenses, one-time costs, Stripe fees, owner’s draw, estimated taxes.
One chart. Revenue forecast + expense forecast = actual runway.
What makes it useful
∙ Real-time updates: Change churn from 5% to 6%, watch your runway shift instantly
∙ Employee toggling: Hide a role, see exactly what that does to cash; without deleting anything
∙ Scenario branching: Save your current state, branch off, try a different path, compare
∙ URL sharing: Every variable encodes into the URL. Send scenarios to co-founders or advisors without attachments
∙ 60-month horizon: Long enough to see how metric changes actually compound
No backend. Everything stays in local storage. No login, no account. I can’t see your data.
Why this matters
Most founders I know either:
1. Look at MRR trends and expenses separately, then do mental math
2. Maintain a nightmare spreadsheet that tries to connect them
3. Pay $500+/month for enterprise FP&A tools built for 50-person companies
I just wanted to plug in my SaaS metrics, add my costs, and see the answer. Now I can.
What I’d love feedback on
∙ Does this framing match a problem you have?
∙ What’s missing that would make it more useful?
∙ Any scenarios you’d want to model that aren’t obvious?
Here’s the link: https://getairstrip.com
