Welcome to Fully Baked, our Sunday newsletter where we validate one of our startup ideas for the public benefit. Anthropic’s taking a slightly more expensive approach 💸
In today's edition:
💡 What happens when your bank account has feelings
🔬 We ran a fake door test on this idea - here's what we found
🚀 The go-to-market playbook for this product
🤑 What the unit economics look like
⚔️ How the competitive landscape looks
❓ Our verdict: is this a go or no-go idea?
Let's goooo 🚀
🪙 Savings Companion App
Penny for your thoughts
Name.com Domain: Penney.app
👤 Source: We shared this idea back in edition #608, our Tamagotchi for your bank account. We think it’s a good one. But five months on, we gave the little coin a website and a Facebook ad and let the internet decide…
❌ Problem:
Saving money is brutal. Nearly a quarter of Americans have no emergency savings at all, and most of us know exactly where the money went. It went on a 2am takeout and a "treat yourself" Amazon order.
The apps built to fix this haven't. Budgeting tools show you a chart, you feel bad, and you stop opening them. Meanwhile, people will happily keep a pixelated bird alive for months. Nobody wants to look after their budget, but they might look after something that depends on it. Here's the idea.
✅ Solution:
Build Penney, a savings app with a character at its heart: Penney, a coin whose mood rises and falls with your savings target.
Connect your accounts (read-only), set a monthly goal, and Penney sends roughly one message a day in its own deadpan voice. It thrives when you're ahead of pace and lets you know how it feels about the fourth takeout of the week.
It's built not to nag. Penney never reacts to rent, bills or groceries, and an unplanned boiler repair moves the target for a month rather than triggering a guilt trip.
🧑💻 Prototyping: Penney Test Site
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🔬 Our Validation Process
🖥️ Desktop Research
58% of Americans say their emergency savings haven't grown in the past year, and 29% say they've gone backwards. The problem isn't awareness. It's follow-through.
A personality can sell money management. Cleo, the sassy AI money assistant, reported $186M in run-rate revenue and 743k active paying subscribers in December 2024. Tone is a real wedge in this category.
The catch is retention. A secondary industry roundup quotes 4.2% day-30 retention for finance apps, but it is not a matched benchmark for a savings companion. We’d track the share of new users who open Penney on day 30, alongside whether they keep saving and paying. A cute coin alone won’t prove any of that.
📣 The Fake Door Test
Rather than survey people about whether they'd use a savings app, we pretended it already existed and asked for an email, in what's called a "fake door test".
We built the Penney site on Lovable. A landing page, a two-minute clickable demo and a "Join the waitlist" box. No app, no bank connection, no Penney (yet).
We ran one Facebook ad to US audiences. A single static image (Penney the coin next to a mock app screen, under the line "Saving feels better with Penney") from a brand-new page with no followers. No video, no variations, no A/B testing.
We spent about $54 on it.
The result: 3 signups. That works out at roughly $18 per signup.
Three strangers saw an ad from an unknown page, visited the site and shared an email. That’s an encouraging first signal, but a tiny sample. It does not prove they’ll connect a bank account or pay for the app.
🚀 Acquiring Users
👥 Early Users
Start with the waitlist. Invite everyone into a TestFlight beta with founding-member pricing locked in for life. Track how many open the app on day 30, keep working towards their savings goal and choose to pay.
Then go where people already talk about money guilt. r/povertyfinance, r/personalfinance and the FinTok crowd. The pitch writes itself: "Your bank account has feelings now. Want to meet it?"
📈 Scaling Acquisition
Penney is the marketing. Its messages are short, dry and screenshot-ready, so build in one-tap sharing ("Penney is disappointed in my Uber Eats habit") and let users do the posting.
Partner with paycheck-to-paycheck audiences: credit unions, employers offering financial wellness perks and creator-led money newsletters, where Penney can be a white-labelled companion rather than another download.
🤑 The Economics of This Business
🏷️ Pricing
Free: $0. The dashboard, one account connection and Penney's daily message. Enough to get hooked.
Pro monthly: $9.99. Unlimited accounts, the full personality roster, weekly recaps and partner sharing.
Pro annual: $59.99 (the real money). Half the monthly price, paid upfront. Annual billing brings cash in upfront, but acquisition still has to fit within the full cost of serving free and paid users.
🧮 Unit Economics
One monthly subscriber (illustrative): $9.99 revenue, $1.50 in app store fees (15% small business rate), about $0.50 for bank data access, $0.30 for AI messages and hosting. That leaves $7.69 contribution, or 77%.
One annual subscriber (illustrative): $59.99 revenue, $9.00 in app store fees, $6.00 for bank data, $3.60 for AI and hosting. That leaves $41.39, or 69%.
Target CAC: below $41 per annual subscriber is only an optimistic ceiling. The model leaves $41.39 before support, refunds, fixed costs and the bank-data and messaging costs of free users. Those costs must come out before setting a sustainable acquisition budget.
Here’s where it gets tricky. At $18 per signup, if 1 in 10 signups becomes a paying customer, each customer costs $180. That is roughly three years of annual subscription revenue, or more than four years of the modelled annual contribution, assuming customers renew. At that conversion rate, even $4 signups imply $40 CAC, leaving almost nothing for the costs above. We need cheaper acquisition, stronger conversion and repeat use. Otherwise, Penney eats your marketing budget.
⚔️ The Competitive Landscape
🏷️ Primary Competitors
Cleo (founded 2016; $186M run-rate revenue in December 2024): The AI money assistant with attitude. Combines a distinctive personality with subscriptions, cash advances and credit products. The lesson: subscriptions alone may not carry a money app.
Finch (2.34M downloads in 90 days): Not a finance app, but a useful adjacent comparison for Penney’s mechanic. You look after a virtual pet by looking after yourself, and it holds a 4.95 rating from 550,000+ reviews. The lesson: people respond to the mechanic, but savings-app retention still needs testing.
🎯 The Gap
The opportunity is better execution, not an untouched category. Penney would need to make saving feel easier through useful messages, a character people care about and bank linking they trust. Existing and prelaunch alternatives mean we need evidence that people prefer it, keep using it and pay.
✅ Go
A Lovable site, one Facebook ad and about $54 got three strangers to join a waitlist. That is enough to justify a small next test, not proof of demand for a paid app or willingness to share bank data.
We’d give this a Go for a lean beta, not a full build. Start with manual entries or simulated balances to test the character and savings habit. Before adding live bank access, confirm the privacy, security and regulatory requirements in the launch market and the appropriate aggregator arrangement.
The conditions are repeat use, willingness to pay and affordable acquisition. Track exact-day-30 app use, progress towards savings goals and paid conversion. Expand only if those results and the full cost of serving free and paid users support the business. If they don’t, no amount of charm will save it.
Time to find out if people will keep Penney alive.
👋 That's All Folks
We hope you enjoyed today’s edition, shoot us a reply if you have any feedback. We read every single one!
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