Zoho Invoice
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Zoho Invoice is a free invoicing tool for freelancers that doesn't cap the number of clients you serve or clients per invoice. You get unlimited expense tracking and time logging built in, which lets you track how long projects actually take. There's no surprise paywall as you grow.
It's well-suited to freelancers and consultants who want a lightweight, free solution without nagging to upgrade. The time tracking integration is handy if you bill hourly or want to see project profitability later, and the ability to add multiple custom fields keeps your invoices branded and professional.