Dev tools · alternatives · 2026
24 alternatives to DefInvoice
Open source billing, payment & invoicing platform
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Invoicy 2.0▲124Invoicing solution for freelancers and small teams
2021 · invoicy.io · its alternatives →
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Credyt▲100Hey HN! I'm the founder of Credyt (https://credyt.ai). If you're running an AI product that burns $0.50+ per interaction, you need to bill customers as usage happens, not at the end of the month. Otherwise you're a bank for your customers, and you'll run out of money before they do. Why invoice-based billing doesn't work for AI: Most usage-based billing tools (Stripe Billing, Orb, etc.) were built for SaaS. They meter usage all month, then send an invoice. That works fine when your COGS is 5%. It's a disaster when you're paying your AI vendor upfront for every request and your…
Nov 2025 · credyt.ai · its alternatives →
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2014 · github.com · its alternatives →
- 10PA
2015 · paidapi.com · its alternatives →
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UniqInvoice▲20Invoice Solutions For Businesses and Freelancers
2024 · uniqinvoice.com · its alternatives →
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My partner and I have been working hard on HealPay. After researching other billing applications, like FreshBooks, we think Invoicing should be free. We are excited to launch additional features pending Hacker News feedback :] View the app at http://www.healpay.com
2011 · healpay.com · its alternatives →
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A Cloud Invoice, Estimate and Accounting Platform
2020 · invoicecrowd.com · its alternatives →
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PlainInvoice▲11Hi HN, I'm a freelance developer, and like many others, I used to manage invoices through clunky spreadsheets, reused templates, and endless email threads with my accountant. To simplify that, I built PlainInvoice.com — a minimal invoicing tool designed for freelancers and small teams. It's clean, fast, and doesn't require sign-up to start. Some features: Generate invoices instantly (no login needed) Save clients, track total billed and actual received (with multi-currency support) Upload attachments (like receipts or contracts) Add teammates or accountants with viewer-only access Works well…
2025 · plaininvoice.com · its alternatives →
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2015 · invoiced.io · its alternatives →
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Invoices, estimates, payments - all from one free app.
2019 · squareup.com · its alternatives →
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Where Professional Invoicing Meets Simplicity.
Jul 2026 · invoice-flow-client.vercel.app · its alternatives →
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Invoice Smarter, Get Paid Faster
May 2026 · a1invoice.com · its alternatives →
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Simple invoices. Faster payments. Less admin.
Aug 2026 · invoicesent.co · its alternatives →
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Effortless recurring invoicing for freelancers and agencies.
Feb 2026 · lightinvoice.app · its alternatives →
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After a lot of personal hardships over the past year, I can finally say that InvoicingAPI is ready for public use. It's a platform where you can create beautiful, customizable and dynamic, tax-compliant invoices with payment links built in, so your clients pay you faster. In your dashboard you can see your payments and payouts to your bank. This is just an initial release and plenty of features are in the pipeline, like an online builder, automated sending, 3rd party app integration, etc. Feel free to poke around and let me know your thoughts!
2024 · invoicingapi.com · its alternatives →
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Offline-first invoicing for freelancers. Free forever.
Mar 2026 · voxinvoice.com · its alternatives →
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InvoicePlane is a free and open source application to manage your quotes, invoices, payments and customers.
2015 · invoiceplane.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →