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Free invoicing and payment tracking for freelancers and small businesses.

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Website, pricing, platforms and company facts side by side.
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| Website | smartinvoice.site | open-gpt.app |
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| Company | 2026 | — |
| Listed in | — |
In their own words, as submitted to SaaSHub.


SmartInvoice is a free invoicing and payment tracking app built for freelancers, small businesses, and independent professionals. Create simple invoices or professional itemized invoices with customizable details, templates, taxes, discounts, due dates, and payment information. Track partial and...
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As answered by people managing SmartInvoice.site and https://open-gpt.app/.
SmartInvoice.site's answer
we help you get paid faster not just creating and sending invoices.
SmartInvoice.site's answer
We manage all your clients and payment activity giving you simplicity and ease of access to understand all your numbers, who owe you in full, partial. reports and summary with downloadable pdf formats. Manual and auto reminders. Forget something ? Don't worry our activity center logs everything for you just scroll and view everything all from a single dashboard with useful features not 100 features you will never interact with.
SmartInvoice.site's answer
Freelancers, small business owners, independent professionals, and small teams that need a simple way to create invoices, track payments, manage outstanding balances, and follow up with clients.
SmartInvoice.site's answer
SmartInvoice was built to make invoicing and payment tracking simpler for freelancers and small businesses. Many people still rely on spreadsheets, notes, or manual follow-ups to keep track of invoices and who has paid. SmartInvoice brings invoicing, payment tracking, reminders, overdue tracking, clients, and reports together in one simple, free app.
SmartInvoice.site's answer
SmartInvoice is built with a vanilla HTML, CSS, and JavaScript frontend and a Python FastAPI backend. It uses SQLAlchemy and Pydantic, PostgreSQL for the database, and Alembic for database migrations. Authentication uses JWT and bcrypt, while Resend is used for transactional email and APScheduler handles scheduled reminders.
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