I got tired of watching founders run out of cash without seeing it coming. So I built Cashrun.
Most founders I know don't have a CFO.
They don't have a finance team.
They don't have an accountant on speed dial.
They have a bank account, a spreadsheet they haven't updated in 3 months, and a gut feeling that things are probably fine.
That gut feeling has killed more startups than bad ideas ever have.
I built Cashrun because I was tired of seeing this happen.
Cashrun is a runway clarity product for bootstrapped founders and solo founders with no finance background.
It tracks your monthly transactions, calculates your exact burn rate, and answers one question clearly every month:
"How many months of cash do I have left?"
No jargon. No complexity. No CFO needed.
The product is live at cashrun.co
7-day free trial. No credit card required.
I'm building in public and would love brutal honest feedback from this community.
What's missing? What would make you actually use this every month?
Really like the framing here. The "spreadsheet they haven't updated in 3 months" line is painfully accurate. I've been working on a similar problem from a different angle — instead of a SaaS tool, I built an Excel-based Startup Runway Planner that does 24-month cash flow projections from a single assumptions tab. The idea is that for very early founders who aren't ready for a monthly subscription tool yet, a one-time $19 spreadsheet with 624 pre-built formulas gets them from "gut feeling" to actual numbers in 30 minutes. It's part of a set called "SaaS Starter Toolkit" on Gumroad. Different approach than Cashrun but solving the same core problem — founders need to see the cliff before they're standing on the edge of it. Cool to see more people building in this space.
The framing is sharp — most founders genuinely do not know how many months they have left until someone asks them to calculate it.
One thing that might be missing from the cash picture: the revenue side has silent leaks too. Failed subscription payments typically account for 5-10% of expected MRR that never arrives — expired cards, soft declines, bank blocks. That is runway-relevant but invisible in most dashboards.
If Cashrun ever shows actual vs expected MRR, it could flag whether a runway shortfall is a spending problem or a collection problem. Those require completely different responses — cutting costs vs recovering revenue.
What does your current revenue input model look like? Manual entry or connected to Stripe?
This is genuinely useful feedback, thank you.
The silent revenue leaks point is something I hadn't framed this way before. Failed payments as a runway problem, not just a billing problem. That reframe alone changes how I'd build the revenue side.
Currently revenue input is manual or via CSV upload. Stripe integration is on the roadmap precisely because of this gap.
The spending vs collection problem distinction is something I want to surface clearly in the dashboard. Two very different responses needed.
Really appreciate you taking the time to dig into this.
That's a real problem for many startups. Having visibility into cash flow before things go wrong can make a huge difference.
Thanks Rahul, totally agree. Many founders don’t realize the runway problem until they’re already close to the wall. Trying to make that visibility simple and automatic.
Exactly. Most founders only start tracking cash flow when it’s already too late. If visibility is automated early, it can literally extend the runway and save a startup.
100%. And by the time most founders feel the pressure, they have weeks left, not months. Early visibility changes the decisions you make, not just the outcome. That's exactly what we're trying to solve with Cashrun.
That’s a great point. When founders only have weeks left, most decisions become reactive instead of strategic.
Curious — does Cashrun mainly help with forecasting runway, or does it also suggest actions to extend it?