Billdu invoicing software: $35K a month, self-reported in 2022 for small businesses

Billdu is invoicing software for contractors, freelancers, entrepreneurs, and small business owners. Its $35K a month was founder-reported on the Indie Hackers product page (not independently verified), as of August 2022.

What it actually sells

Billdu sells invoicing software for creating invoices, estimates, quotes, receipts, purchase orders, and related business documents. Its apps cover professional invoices, estimates, purchase orders, delivery notes, and more. The site describes Billdu as “Ideal for contractors, freelancers, and small business owners who want to stay organized, win more jobs, and get paid on time.”

How it charges

Annual plans average $4.99 Lite, $9.99 Standard, and $19.99 Premium monthly. The Premium plan includes API access, 10 team members, recurring invoices, high priority support, and API access. Billdu also offers a free downloadable template and seven days of the Billdu Invoice Maker app for free.

Where customers come from

The site shows Billdu on mobile and web. It offers a free downloadable template, provides a subscription guide and help center, and offers the app for Android, iPhone, iPad, and Apple Watch. The site lists contractors, freelancers, entrepreneurs, and small business owners as its intended customers.

What stands out

Billdu supports creating and sending professional invoices, accepting online payments with Apple Pay, Google Pay, and Stripe, automating recurring invoices, and scanning receipts. Accepted estimates can become invoices with one click. The site reports more than 1,500,000 freelancers and small businesses use Billdu, with a 4.8 rating from 70K ratings.

From the official site

Ideal for contractors, freelancers, and small business owners who want to stay organized, win more jobs, and get paid on time.

Create and send professional invoices in seconds, accept instant payments, and track expenses, all from your phone.

Excerpts from the official website, fetched October 1, 2026.

Where it sits in the data

Billdu's $35K a month is higher than 80% of the 6,604 projects with founder-reported monthly revenue in our dataset; the median across them is $2K. Snapshot: 2026-09-30. The dataset only covers founders who chose to publish their numbers, so it leans toward businesses that work; use it for scale, not as an average.

Currency

All figures are in US dollars as published. A rough yuan or euro conversion is not applied here because prices, taxes and acquisition costs differ by country.

Could you build something like this?

In my view, demand would come from contractors, freelancers, entrepreneurs, and small business owners who need invoices, estimates, quotes, receipts, purchase orders, and payment collection. Distribution would need visible surfaces such as a free downloadable template, app stores, mobile availability, web availability, subscription guidance, and a help center.

The hard parts are payment integration, reliable business-document handling, recurring invoicing, receipt scanning, app support, and serving users across Android, iPhone, iPad, Apple Watch, and web. API access, team members, and high priority support add product and support requirements. Competition and account security would also matter.

Verdict: Hard to replicate.

One thing to take from it

One thing to take from Billdu is the product shape: invoicing, estimates, quotes, receipts, purchase orders, recurring invoices, online payments, and expense scanning are presented in one business-document workflow. The site reports more than 1,500,000 freelancers and small businesses use Billdu and that it generates over 300,000 business documents monthly.

Sources

Billdu official website, fetched October 1, 2026
Billdu pricing page, fetched October 1, 2026
Billdu about page, fetched October 1, 2026
Indie Hackers product page: revenue founder-reported on the Indie Hackers product page (not independently verified), as of August 2022

Revenue, team and start-cost figures are what the founder reported at the interview date, not current figures and not a prediction of what you will earn. Product and pricing facts come from the business's own website as checked on 30 September 2026. Method & sources · Disclosure