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✦ your blueprint ✦
Safe To Spend
“Know what's owed, overdue, and truly yours.”
seed: "A simple web app for freelancers that tracks invoices, overdue payments and quar…"
Quick facts
Who it's for
Maya, a 31-year-old freelance designer in Portland who bills about ten clients a month, opens her banking app, three invoice emails and a color-coded spreadsheet every Sunday night, trying to guess how much of her $6,400 balance is…
Start-up cost
$590-1,905
Rough estimate for the first 90 days, not financial advice.
First 3 steps
Interview 10 freelance designers, developers, photographers and writers about how they track invoices and tax money today.
Sketch the single-screen dashboard with the big safe-to-spend number and test it with five of those freelancers.
Build a clickable prototype in Figma or a no-code tool and ask interviewees whether they would use it.
The Pitch
Safe To Spend is a mobile app that gives solo creatives one calm answer to the question they ask every morning: how much of this money is actually mine? Developers, designers, photographers and writers log or import invoices, then watch a single dashboard show what's owed, what's overdue (flagged with a one-tap polite reminder email) and a tax set-aside that grows with every payment, based on a percentage they choose, toward a countdown to the next quarterly deadline. The big "safe to spend" number sits at the top of the screen, replacing scattered spreadsheets, inbox searches and bank tabs with steady, in-control confidence instead of end-of-quarter dread. It's free for up to 3 active clients, and Pro costs $10 per month (or $96 per year, equal to $8 per month) for unlimited clients, automated reminders, bank-feed sync and exportable quarterly summaries to hand straight to an accountant, with no per-invoice fees from us and any card or bank processing fees charged by your own payment provider.
For Whom
Maya, a 31-year-old freelance designer in Portland who bills about ten clients a month, opens her banking app, three invoice emails and a color-coded spreadsheet every Sunday night, trying to guess how much of her $6,400 balance is really hers after overdue payments and the $2,300 she owes in quarterly taxes. She wants one glance that tells her what is safe to spend. Until then she sends awkward reminder emails from memory and quietly pads her tax savings by guesswork.
Mock Screens
9:41●●●
Overview
💸
You can safely spend $3,284
Phone-sized dashboard for Tuesday, Sept 9: $7,950 paid this quarter, minus $1,988 set aside for taxes (25%), minus $2,678 in upcoming bills, leaves $3,284 free. Q3 estimated tax is due in 6 days (Sept 15), and your set-aside is 100% funded. Below, 3 invoices are outstanding: Harbor & Pine Studio $2,400 is 12 days overdue (red flag, 'Send polite reminder' button), Lumen Coffee Co. $850 is due in 4 days, and Nora Feldt Books $1,200 is due Sept 30. You're on the Free plan with 3 of 3 clients active; Pro is $10/month or $96/year for unlimited clients.
Safe-to-spend balance card with tax set-aside bar and 6-day countdown
Overdue alert: Harbor & Pine Studio $2,400, 12 days late, Send reminder
Free plan meter 3/3 clients with Upgrade to Pro $10/mo button
●○○○
9:41●●●
In use
💸
You can safely spend $2,184 today
Home screen on a Tuesday morning: $6,420 paid this quarter, $1,605 auto-set aside for taxes (25%), and $3,200 still owed across 4 invoices. Northwind Studio's $1,150 invoice is 9 days overdue, with a one-tap polite reminder ready to send. Q3 estimated tax is due in 23 days. Pro is $10/month or $96/year ($8/month x 12) for unlimited clients, auto reminders, bank sync and accountant-ready summaries.
Safe-to-spend balance: $2,184
Overdue: Northwind Studio $1,150 - Send reminder
Tax set-aside bar: $1,605 | 23 days to Q3 deadline
Upgrade to Pro: $96/yr
●○○○
9:41●●●
Result
💸
You can safely spend $2,184 this week
Mobile dashboard for Maya, a freelance designer: $6,420 paid in June, $1,605 set aside for taxes (25%), $3,150 outstanding across 4 invoices. Invoice #1042 from Brightline Studio ($1,200) is 9 days overdue, with a polite reminder ready to send. Q2 tax deadline countdown: 11 days left, set-aside 92% funded. Free plan: 2 of 3 clients used. Pro is $10/month or $96/year ($8/month x 12).
Safe-to-spend balance card
Overdue invoice alert with Send Reminder button
Tax set-aside progress bar with 11-day countdown
Upgrade to Pro banner: $10/mo or $96/yr
●○○○
The Hero View
the one screen / scene people will remember
9:41● ● ●
💸
Safe To Spend: $4,286
After $3,140 tax set-aside and $5,920 still owed. Next quarterly deadline: June 16, 23 days away.
Safe To Spend
You can safely spend $4,286 this month
Paid income this quarter is $12,560. Your 25% tax set-aside is $3,140, and $5,134 has already gone to rent, software and other bills. Two invoices totaling $2,350 are overdue, so that money is not counted as safe until it lands.
Owed (7 open invoices)
$5,920
Overdue (2 invoices)
$2,350
Tax set-aside (25%) · 23 days left
$3,140 of $3,900 goal
in this view
1
Brightline Studio · INV-1042
$1,400 · 12 days overdue · reminder sent 3 days ago · flagged red
2
Marlow & Finch · INV-1038
$950 · 5 days overdue · polite reminder ready to send
3
Oakhouse Press · INV-1047
$1,800 · due in 6 days · on track
4
Nova Health · INV-1049
$1,720 · paid today · $430 auto-added to tax set-aside
Send reminders to 2 overdue clients
Add or import an invoice
Export quarterly summary (Pro: $10/month or $96/year)
Core Features
Single-screen dashboard showing money owed, money overdue, tax set-aside balance and a 'Safe To Spend' figure (paid income minus reserved taxes) at a glance
Invoice logging and CSV import, with each invoice tracked as draft, sent, paid or overdue and tied to a client
Overdue flagging with one-tap polite reminder emails using editable templates; Pro adds automated reminders on a schedule you set (free plan covers up to 3 active clients)
Automatic tax set-aside calculator that reserves a user-defined percentage of every paid invoice and builds toward the next quarterly deadline
Quarterly deadline countdown with push notifications at 30, 7 and 1 days out, showing how much is set aside versus still needed
Bank-feed sync (Pro) that matches incoming deposits to open invoices and marks them paid automatically
Exportable quarterly summary (Pro) in PDF and CSV with income, set-asides and paid invoices, ready to hand to an accountant; Pro costs $10 per month or $96 per year ($8 per month x 12)
aiA lightweight LLM integration (e.g. an OpenAI or Anthropic API) to draft tone-adjustable reminder emails, and a rules-plus-ML categorizer to match bank transactions to invoices and flag likely late payers. Keep the safe-to-spend and tax set-aside calculations deterministic and rule-based, with AI used only for suggestions, never for the final figures.dataPostgreSQL (managed, e.g. Supabase or AWS RDS) for clients, invoices, payments and tax set-aside settings, with Redis for queues and caching. Plaid for bank-feed sync on Pro accounts, with encrypted storage of tokens, row-level security, and S3-compatible storage for exported quarterly summary PDFs and CSVs.backendNode.js with NestJS (TypeScript) exposing a REST API, with BullMQ job queues for scheduled overdue checks, polite reminder emails (sent via Postmark) and quarterly deadline notifications. Auth through Clerk or Auth0, and Stripe Billing for subscriptions covering the free tier (up to 3 active clients) and the Pro plan at $10 per month or $96 per year ($8 per month x 12), with no per-invoice fees from us since card and bank processing fees stay with the user's own payment provider.frontendReact Native with Expo and TypeScript for a single codebase on iOS and Android, using React Query for data fetching and Victory Native for the dashboard charts and quarterly tax countdown. A lightweight React web companion view reuses the same TypeScript logic for desktop access.platformMobile-first on iOS and Android via Expo EAS Build and OTA updates, with push notifications through Expo Notifications for overdue alerts and tax deadline countdowns. Backend hosted on AWS (ECS Fargate) or Render with GitHub Actions CI/CD, Sentry for error monitoring and PostHog for product analytics.
Business Plan
First steps
Interview 10 freelance designers, developers, photographers and writers about how they track invoices and tax money today.
Sketch the single-screen dashboard with the big safe-to-spend number and test it with five of those freelancers.
Build a clickable prototype in Figma or a no-code tool and ask interviewees whether they would use it.
Set up a simple landing page with a waitlist and the free and Pro plans ($10 per month or $96 per year).
Pick a no-code or AI app builder and map the minimum features: invoice log, overdue flag, reminder email, tax set-aside.
Startup costs
Landing page and domain$10-40/mo
AI app builder or no-code platform (Lovable, Bolt, Glide)$20-50/mo
Backend and database (Supabase or Airtable)$0-25/mo
Transactional email service for reminders$0-20/mo
Payments setup (Stripe) with no upfront fee$0-0 one-off
Freelance developer for bank-feed and mobile packaging$500-1500 one-off
First 90 days, total$590-1,905
90-day plan
Days 1-30
Validate demand and design
10 customer interviews completed
5 prototype tests with positive feedback
50 waitlist sign-ups
Days 31-60
Build and test the MVP
Working invoice log, overdue flags and tax set-aside live
10 beta testers using it weekly
Reminder emails sent successfully by 5 testers
Days 61-90
Launch and first revenue
Public launch on the app stores or as a web app
First 5 paying Pro customers
20 active free users
Rough estimate to plan with, not financial advice. Costs vary a lot by country, scope and how much you do yourself.
Financial projection (estimate)
An estimate built from the assumptions below, not financial advice. Change any number to see your own version.
Covers its monthly costs from month 12
Start-up cost not paid back within 12 months
$9 left over from each sale
Profit Cash
Assumptions · The owner's assumptions
Monthly running costs: $108
Landing page and domain: $25 from this plan
AI app builder or no-code platform (Lovable, Bolt, Glide): $35 from this plan
Backend and database (Supabase or Airtable): $13 from this plan
Transactional email service for reminders: $10 from this plan
Bank-feed data aggregator subscription (estimate for Pro bank-sync): $25 AI estimate
Month
Revenue
Costs
Profit
Cash
1
$50
$111
−$61
−$1,061
2
$54
$111
−$57
−$1,118
3
$58
$111
−$53
−$1,171
4
$63
$112
−$49
−$1,220
5
$68
$112
−$44
−$1,264
6
$73
$112
−$39
−$1,303
7
$79
$113
−$33
−$1,336
8
$86
$113
−$27
−$1,364
9
$93
$113
−$21
−$1,384
10
$100
$114
−$14
−$1,398
11
$108
$114
−$6
−$1,405
12
$117
$115
$2
−$1,403
3-year view
Revenue
Costs
Profit
Cash
Year 1
$949
$1,352
−$403
−$1,403
Year 2
$1,423
$1,380
$43
−$1,360
Year 3
$2,135
$1,422
$713
−$647
Security & Threat Model
Sensitive data
Bank-feed tokens and transaction historyClient names, emails and invoice amountsTax set-aside balances and quarterly summariesReminder email content and send historyDevice push tokens and notification preferences
Roles & permissions
Free user— Manage own data for up to 3 active clients; send manual reminders; view dashboard and countdown.
Pro user— Everything in free plus unlimited clients, bank sync, scheduled reminders and PDF/CSV quarterly exports of own data.
Accountant recipient (export only)— Open a shared quarterly summary link or file; read-only, no account or app access.
Support admin— View account status and billing metadata; no access to invoices, bank data or tokens without user consent.
Abuse cases
⚠ Attacker abuses one-tap reminders to send spam or phishing emails to arbitrary addresses through our sending domain, harming deliverability.
Mitigation
Limit sends per user and per recipient daily, restrict recipients to saved clients, lock template links to approved placeholders, sign with SPF/DKIM, and suspend abusive accounts.
⚠ Stolen session or bank-feed token lets an attacker read a user's transactions or client list.
Mitigation
Use read-only aggregator tokens stored server-side encrypted, require biometric or re-auth to connect banks and export, and revoke tokens on logout, password change or disconnect.
⚠ Bank-feed auto-matching marks invoices paid wrongly, inflating the safe-to-spend figure so users underfund taxes.
Mitigation
Auto-match only on exact amount plus client or reference match, queue ambiguous deposits for confirmation, log changes with undo, and show a confidence label on matches.
⚠ Quarterly export links leak income and client data when forwarded or guessed.
Mitigation
Generate exports on demand, use unguessable single-use links expiring in 24 hours, let users revoke them, and exclude full client emails unless the user opts in.
⚠ Malicious CSV import uses formula injection or oversized files to run code in spreadsheets or exhaust resources.
Mitigation
Cap file size and row count, prefix cells starting with =,+,-,@ when exporting, and parse imports in a sandboxed server job with schema validation.
Compliance
GDPR/UK GDPR and CCPA for financial and client personal data, GLBA-style safeguards where bank data is aggregated, CAN-SPAM for reminder emails, and PCI only via hosted checkout for Pro billing; the app gives no tax advice.
Must pass before launch
☐ A user cannot read, export or email using another user's invoices, clients or bank tokens by changing IDs in API requests (all return 403/404).
☐ Reminder emails can be sent only to addresses saved on the user's own clients, and the daily cap blocks the next send with a clear error.
☐ Disconnecting a bank revokes the aggregator token and halts transaction syncing within 5 minutes, verified by a test deposit not appearing.
☐ Expired or revoked quarterly export links return 410/403 and the file is not downloadable without the token.
The Vibe Trail
01 · audience
🧑💻 🎨 📸 ✍️
Independent creatives juggling many clients, watching cash flow closely and wanting less administrative friction in thei…
02 · domain or indu
🧾 📊 💰 🗂️
Invoicing and bookkeeping territory where clarity about money owed and money reserved for taxes matters most.
03 · mood/feeling
😌 📈 🛡️ ⏰
Calm, in-control confidence that replaces end-of-quarter dread with a steady sense of financial peace.