For freelance developers
Ship code. Send invoice. Get paid.
Split projects into milestones, invoice per sprint, track Thai withholding — without a bookkeeper.
What gets in the way
Big projects don't fit single invoices
3-month build — clients want milestones, not lump sum. Google Docs falls apart.
Every agency withholds 3%
You calculate net manually. One mistake = reissue invoice = wasted day.
Year-end tax is a fog
No idea what you earned, what you spent, or how much WHT was deducted.
How Flowly helps
Milestones in quotation
Line items: Design (30%) + Backend (40%) + Frontend (20%) + Launch (10%). Totals split automatically.
Invoice per milestone
Sprint done → invoice just that phase. Client sees paid vs outstanding.
Auto WHT calculation
3% IT services / 5% software / custom %. Per-invoice settings.
Year-end tax summary
Income, WHT totals, expenses (servers, domains, tools) — file from one dashboard.
Good fit for
- Web / webapp development
- iOS / Android apps
- API / backend
- Technical consulting
- WordPress / Shopify customization
Frequently asked questions
Can I invoice international startups in English?
Yes. PDF locale per invoice — great for US / SG / EU clients.
Can I describe scope in agile terms (sprints, story points)?
Yes. Line item descriptions are free-form — use sprints, phases, modules, whatever fits your process.
Multi-currency (USD / SGD)?
Free plan is THB-only. Pro+ supports multiple currencies — useful if you bill overseas.
Ready to try it?
Free plan: 15 invoices/month, no watermark, no credit card.
Start free