Choose Cadus when
You want unlimited invoices without a monthly fee.
You want your invoices next to expenses, mileage, and tax records.
You also schedule jobs or track employee hours.
Invoice Simple alternative
An Invoice Simple alternative with unlimited invoices on the free plan
Invoice Simple's plans are priced by how many invoices you send each month. Cadus includes unlimited invoices on its Free plan, next to your expenses and tax records.
Choose Invoice Simple when
You only need invoices and estimates and nothing else.
You want invoices without Cadus branding, on a plan priced by volume.
You already have your client list set up there.
Cadus vs Invoice Simple
Category
Cadus
Invoice Simple
Starting price
Free plan at $0, with no payment card and no expiration. Pro is $12.99/month, or $99.99/year ($8.33/month).
Listed from $6.99 a month after a free trial, for up to 3 invoices a month.
Unlimited invoices
Unlimited Cadus-branded invoices on the Free plan. Pro removes the branding.
Listed on its $21.99 a month plan.
Expenses and receipts
Bank sync, Schedule C categories, 10 smart receipt scans a month, and 30 automatic mileage tracks a month on the Free plan. Pro makes scans and mileage unlimited.
An invoicing app first.
Jobs and staff hours
Job scheduling and employee hours with an iPad time clock are included on the Free plan.
Not the focus of its plans.
Related Cadus workflows
Invoicing and payments
Invoice Tracking App
Create invoices, track payments, and keep income next to expenses in Cadus, a mobile finance app for self-employed workers and small businesses.
Income tracking
Income Tracking App
Track income, invoices, payments, expenses, and profit in Cadus, a mobile app for U.S. freelancers, contractors, and small business owners.
Business expense tracking
Expense Tracker App
Track business expenses, scan receipts, sync bank transactions, and organize tax deductions in Cadus, a U.S. expense tracker app for self-employed workers.
Related buyer guides
Invoice Simple FAQ
Is Cadus really unlimited for invoices on the Free plan?
Yes. Free invoices carry Cadus branding, and Pro lets you remove it and add your logo.
Can Cadus accept payments on invoices?
Yes, if you enable online invoice payments in the app. Processing fees apply.
Where these details come from
We read Invoice Simple's own website on November 9, 2026. Prices and limits change, so check the current page before you decide.
Invoice Simple is a trademark of its respective owner. Cadus is not affiliated with, endorsed by, or sponsored by Invoice Simple. This comparison is for general product-positioning and buyer-research purposes.