Invoice Maker
Invoices in a minute. Pay once.
Native iOS invoicing for freelancers and small businesses: WYSIWYG vector PDFs, six templates, handwritten signatures, and iCloud sync — with zero data collection.
HANGZHOU · EST. 2023
Etch the features.
Polish the experience.
Good design makes the experience better.
01 — Products
1 on the App Store · 1 in development
Made by Drophon.
Invoice Maker is a local document tool: it does not connect to the internet, does not issue invoices on your behalf, and collects no data. It performs no tax filing and no payment processing — the invoice is yours, start to finish.
NamingLab
Meet good names. Every one has a source.
A Chinese-language naming tool: every name carries its source work, its original line and its story — and the whole library ships inside the app, so it never needs the network.
NamingLab is still in development. The name library ships inside the app bundle: no network, no upload, no account, and nothing collected about you.
02 — Writing
All writing →Notes from the workbench.
- 01 Why Invoice Maker is pay-once Subscriptions are the default business model of modern software. For Invoice Maker, we chose the harder one on purpose — and it fits this app specifically. Sep 16, 2026
- 02 Designing a PDF engine you can trust The preview is the product: how Invoice Maker renders vector PDFs with Core Graphics and keeps WYSIWYG honest. Sep 10, 2026
03 — About
The Droplet. The Sophon.
The name comes from Liu Cixin's The Three-Body Problem.
The Droplet: an absolutely smooth interface, every unnecessary bit of friction removed.
The Sophon: computation at a microscopic scale — invisible, yet everywhere.
