# an invoicing tool for SaaS founders **This is a crowded market with strong adjacent tools; a SaaS-specific invoicing product only wins if it nails recurring billing, tax/compliance, and founder workflow better than general invoicing tools.** Confidence: medium · 81 signals · checked 2026-08-01 [Full report with live links](https://showsitsworks.com/idea/an-invoicing-tool-for-saas-founders) ## Who is already building this *From data* - Modernbanc is a live accounting product for startups and small businesses, with 123 points and 113 comments on its launch thread; the team says it is fast, works offline, and automates bookkeeping. - [Launch HN: Modernbanc (YC W20) – Modern and fast accounting software](https://news.ycombinator.com/item?id=43414405) `hackernews` — 2025-03-19 - Flexprice is a live open-source monetization platform for AI and agentic companies, with 7 points and 14 comments; it supports usage-based, credit-based, and hybrid pricing models. - [Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit](https://news.ycombinator.com/item?id=44422663) `hackernews` — 2025-06-30 - Invoxo is a live invoicing tool aimed at cross-border EU services, with 2 points; its pitch is automatic EU VAT handling and reverse-charge checks. - [Show HN: Invoxo – Invoicing with automatic EU VAT for cross-border services](https://news.ycombinator.com/item?id=46923046) `hackernews` — 2026-02-07 - Well is a live AI-based invoice-collection tool, launched with 8 points and 6 comments, and it automates supplier invoice collection into accounting tools, ERP, or dashboards. - [Show HN (YC S25): Well – MCP AI-Based Collection of Invoices](https://news.ycombinator.com/item?id=43871312) `hackernews` — 2025-05-02 - Bonsai is already a known founder/freelancer invoicing product in the HN record, with a founder saying it has time tracking, invoicing, reporting, and more. - [Question for Freelancers](https://news.ycombinator.com/item?id=20821495) `hackernews` — 2019-08-28 - MakeLeaps is a live invoicing player in Japan, and HN hiring posts describe it as cloud invoicing with a team of 6 developers, a designer, and customer support staff. - [Ask HN: Who is hiring? (September 2014)](https://news.ycombinator.com/item?id=8252996) `hackernews` — 2014-09-01 - QuickBooks, Wave, FreshBooks, Maxio, Zoho Invoice, Zoho Billing, and Dodo Payments appear repeatedly in the broader SaaS billing landscape as practical options for startups. - [What are The Best Invoicing Software For B2B SaaS Startups?](https://turnstile.ai/blog/invoicing-software) `tavily` - [11 Best SaaS Billing Platforms You Can Explore in 2026](https://www.outseta.com/posts/best-saas-billing-platforms) `tavily` - [10 Best Invoicing and Billing Software for 2026 | Salesforce](https://www.salesforce.com/sales/revenue-lifecycle-management/billing-software) `tavily` - [Best invoicing software for startups and small businesses](https://mercury.com/blog/best-invoicing-software-for-startups-small-businesses) `tavily` - There are also many small live projects and repos around founder finance and invoicing, including FoundersHQ, FounderOS, KeepTrak, CFO Buddy, NOVA, Ghost-Founder, payup, and Lync; several were pushed in 2026 and look maintained. - [TahaKhanM/FoundersHQ](https://github.com/TahaKhanM/FoundersHQ) `github` — 2026-02-28 - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - [yethikrishna/keeptrak](https://github.com/yethikrishna/keeptrak) `github` — 2026-05-11 - [Shruti-lab/CFO_Buddy](https://github.com/Shruti-lab/CFO_Buddy) `github` — 2025-09-10 - [eshagarwal1306-maker/nova](https://github.com/eshagarwal1306-maker/nova) `github` — 2026-07-18 - [48cork/ghost-founder](https://github.com/48cork/ghost-founder) `github` — 2026-02-25 - [dancolta/payup](https://github.com/dancolta/payup) `github` — 2026-06-04 - [mroqa/Lync](https://github.com/mroqa/Lync) `github` — 2026-06-05 ## What people actually say *From data* - "Every time I invoiced a client in another EU country, I had to manually check if reverse charge applies, validate their VAT number on VIES, and figure out the correct tax treatment." This is a founder describing painful manual invoicing work. - [Show HN: Invoxo – Invoicing with automatic EU VAT for cross-border services](https://news.ycombinator.com/item?id=46923046) `hackernews` — 2026-02-07 - "Stripe charges 0.4% often up to $2 each, to generate PDF invoices for one-time payment purchases." This shows people are watching invoicing fees closely. - [Show HN: A tool to simplify invoicing in Stripe (invoicelyapp.com)](https://news.ycombinator.com/item?id=44463431) `hackernews` — 2025-07-04 - [Show HN: A tool to simplify invoicing in Stripe](https://news.ycombinator.com/item?id=43973785) `hackernews` — 2025-05-13 - "I use Stripe a lot and when it comes to invoicing, it can become tedious and expensive when running multiple Stripe accounts." This is a concrete complaint from a user who wants less friction and lower cost. - [Show HN: A tool to simplify invoicing in Stripe](https://news.ycombinator.com/item?id=43973785) `hackernews` — 2025-05-13 - "I built an offline-first, open-source invoicing app because I didn’t want SaaS lock-in" is a direct first-hand preference for control over hosted invoicing. - [about the best invoicing software, which ones actually feel practical? : r/smallbusiness](https://www.reddit.com/r/smallbusiness/comments/1pgxlon/about_the_best_invoicing_software_which_ones) `tavily` - "Most SaaS founders end up paying for a slew of different tools" is a broad statement from an article, not a first-hand complaint, so it is weaker evidence of workflow fragmentation. - [11 Best SaaS Billing Platforms You Can Explore in 2026](https://www.outseta.com/posts/best-saas-billing-platforms) `tavily` ## People asking to be sold to *From data* - "I built the tool I wanted." This is a founder explicitly shipping for their own unmet need. - [Show HN: Invoxo – Invoicing with automatic EU VAT for cross-border services](https://news.ycombinator.com/item?id=46923046) `hackernews` — 2026-02-07 - "I created a small tool that I use to generate invoices for clients from my various Stripe accounts, and avoid the Stripe charges." This is a direct willingness-to-use signal driven by fee avoidance. - [Show HN: A tool to simplify invoicing in Stripe](https://news.ycombinator.com/item?id=43973785) `hackernews` — 2025-05-13 - "I built an offline-first, open-source invoicing app because I didn’t want SaaS lock-in" shows a clear preference that can translate into paid adoption for self-hosted or owner-controlled tools. - [about the best invoicing software, which ones actually feel practical? : r/smallbusiness](https://www.reddit.com/r/smallbusiness/comments/1pgxlon/about_the_best_invoicing_software_which_ones) `tavily` ## Where the opening is *Model estimate* - The signals do not show a clear gap for a generic invoicing app. The repeated needs are more specific: EU VAT and reverse charge, Stripe invoice fee avoidance, invoice chasing, and broader finance ops for founders. - [Show HN: Invoxo – Invoicing with automatic EU VAT for cross-border services](https://news.ycombinator.com/item?id=46923046) `hackernews` — 2026-02-07 - [Show HN: A tool to simplify invoicing in Stripe](https://news.ycombinator.com/item?id=43973785) `hackernews` — 2025-05-13 - [dancolta/payup](https://github.com/dancolta/payup) `github` — 2026-06-04 - [eshagarwal1306-maker/nova](https://github.com/eshagarwal1306-maker/nova) `github` — 2026-07-18 - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - No existing player in the signals is clearly positioned as 'invoicing for SaaS founders' with a strong focus on recurring SaaS billing plus founder-level cash-flow context in one workflow. - [Launch HN: Modernbanc (YC W20) – Modern and fast accounting software](https://news.ycombinator.com/item?id=43414405) `hackernews` — 2025-03-19 - [TahaKhanM/FoundersHQ](https://github.com/TahaKhanM/FoundersHQ) `github` — 2026-02-28 - [11 Best SaaS Billing Platforms You Can Explore in 2026](https://www.outseta.com/posts/best-saas-billing-platforms) `tavily` - [Best invoicing software for startups and small businesses](https://mercury.com/blog/best-invoicing-software-for-startups-small-businesses) `tavily` - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - [Shruti-lab/CFO_Buddy](https://github.com/Shruti-lab/CFO_Buddy) `github` — 2025-09-10 - The data also does not show a strong wedge around invoice creation alone; several adjacent tools already bundle invoicing with billing, accounting, cash flow, or collection. - [Launch HN: Modernbanc (YC W20) – Modern and fast accounting software](https://news.ycombinator.com/item?id=43414405) `hackernews` — 2025-03-19 - [Show HN (YC S25): Well – MCP AI-Based Collection of Invoices](https://news.ycombinator.com/item?id=43871312) `hackernews` — 2025-05-02 - [Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit](https://news.ycombinator.com/item?id=44422663) `hackernews` — 2025-06-30 - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - [dancolta/payup](https://github.com/dancolta/payup) `github` — 2026-06-04 ## How big the market might be *Model estimate* - This search found 18 GitHub repos, 15 registry packages, 30 HN items, 10 Dev.to posts, 1 Discourse thread, and 7 Tavily web pages mentioning the space. - There are 23 live projects or products in the signals that touch invoicing, billing, finance, or founder ops, and several are maintained with pushes in 2026. - [Launch HN: Modernbanc (YC W20) – Modern and fast accounting software](https://news.ycombinator.com/item?id=43414405) `hackernews` — 2025-03-19 - [npm: @substrat-run/engine-invoicing](https://www.npmjs.com/package/@substrat-run/engine-invoicing) `registries` — 2026-08-02 - [npm: @ourthinktank/founders-os-core](https://www.npmjs.com/package/@ourthinktank/founders-os-core) `registries` — 2026-07-28 - [npm: @ourthinktank/founders-os](https://www.npmjs.com/package/@ourthinktank/founders-os) `registries` — 2026-07-28 - [TahaKhanM/FoundersHQ](https://github.com/TahaKhanM/FoundersHQ) `github` — 2026-02-28 - [Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit](https://news.ycombinator.com/item?id=44422663) `hackernews` — 2025-06-30 - [astratesting/invoiceflow-9921dc-9fa63a](https://github.com/astratesting/invoiceflow-9921dc-9fa63a) `github` — 2026-06-07 - [dominiclifuchun-cell/tally-assistant](https://github.com/dominiclifuchun-cell/tally-assistant) `github` — 2026-07-07 - [yethikrishna/keeptrak](https://github.com/yethikrishna/keeptrak) `github` — 2026-05-11 - [electromist/ai-cfo-core](https://github.com/electromist/ai-cfo-core) `github` — 2026-03-01 - [48cork/ghost-founder](https://github.com/48cork/ghost-founder) `github` — 2026-02-25 - [AIBACKOFFICELAB/invoice-pilot-landing](https://github.com/AIBACKOFFICELAB/invoice-pilot-landing) `github` — 2026-06-18 - [santhoshshandeep/santhoshshandeep](https://github.com/santhoshshandeep/santhoshshandeep) `github` — 2026-06-27 - [eshagarwal1306-maker/nova](https://github.com/eshagarwal1306-maker/nova) `github` — 2026-07-18 - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - [Shruti-lab/CFO_Buddy](https://github.com/Shruti-lab/CFO_Buddy) `github` — 2025-09-10 - [MasteraSnackin/runway-arcade](https://github.com/MasteraSnackin/runway-arcade) `github` — 2026-07-05 - [dante-perea/foundr-money](https://github.com/dante-perea/foundr-money) `github` — 2026-05-30 - [dancolta/payup](https://github.com/dancolta/payup) `github` — 2026-06-04 - [mroqa/Lync](https://github.com/mroqa/Lync) `github` — 2026-06-05 - The largest usage number in the signals is 1,860,620 Docker pulls for foundersfactory/sentry, but within the invoicing-specific set the biggest concrete usage number is 14,961 monthly npm downloads for @aws-sdk/client-invoicing. - [docker: foundersfactory/sentry](https://hub.docker.com/r/foundersfactory/sentry) `registries` - [npm: @aws-sdk/client-invoicing](https://www.npmjs.com/package/@aws-sdk/client-invoicing) `registries` — 2026-07-31 - There was only 1 first-hand complaint, 0 unsolved Stack Exchange questions, and 0 stated wants, so the pain is real but thinly evidenced in this search. - The only named community forum with a matching thread is community.openai.com, but the counted facts do not give thread volume there. ## What could go wrong *Model estimate* - This market is crowded and adjacent products already cover slices of the job, so a new entrant needs a sharper wedge than 'better invoicing.' - [Launch HN: Modernbanc (YC W20) – Modern and fast accounting software](https://news.ycombinator.com/item?id=43414405) `hackernews` — 2025-03-19 - [What are The Best Invoicing Software For B2B SaaS Startups?](https://turnstile.ai/blog/invoicing-software) `tavily` - [Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit](https://news.ycombinator.com/item?id=44422663) `hackernews` — 2025-06-30 - [Best invoicing software for startups and small businesses](https://mercury.com/blog/best-invoicing-software-for-startups-small-businesses) `tavily` - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - [dancolta/payup](https://github.com/dancolta/payup) `github` — 2026-06-04 - A lot of the obvious pain is already being attacked through accounting, billing, collection, and finance-ops tools, which can make pure invoicing easy to copy. - [Launch HN: Modernbanc (YC W20) – Modern and fast accounting software](https://news.ycombinator.com/item?id=43414405) `hackernews` — 2025-03-19 - [Show HN (YC S25): Well – MCP AI-Based Collection of Invoices](https://news.ycombinator.com/item?id=43871312) `hackernews` — 2025-05-02 - [Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit](https://news.ycombinator.com/item?id=44422663) `hackernews` — 2025-06-30 - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - [dancolta/payup](https://github.com/dancolta/payup) `github` — 2026-06-04 - The best evidence here is around compliance and fee avoidance, not around general demand for yet another SaaS invoicing app. - [Show HN: Invoxo – Invoicing with automatic EU VAT for cross-border services](https://news.ycombinator.com/item?id=46923046) `hackernews` — 2026-02-07 - [Show HN: A tool to simplify invoicing in Stripe](https://news.ycombinator.com/item?id=43973785) `hackernews` — 2025-05-13 - [Building a B2B Electronic Invoicing API for French PDP Compliance in 2026](https://dev.to/julien786534/building-a-b2b-electronic-invoicing-api-for-french-pdp-compliance-in-2026-2p05) `devto` — 2026-04-27 - [10 Best Invoicing and Billing Software for 2026 | Salesforce](https://www.salesforce.com/sales/revenue-lifecycle-management/billing-software) `tavily` ## What to do this week *Model estimate* - Start with one narrow wedge: SaaS invoicing for cross-border EU founders, where VAT, reverse charge, and compliance are the pain. - [Show HN: Invoxo – Invoicing with automatic EU VAT for cross-border services](https://news.ycombinator.com/item?id=46923046) `hackernews` — 2026-02-07 - [Building a B2B Electronic Invoicing API for French PDP Compliance in 2026](https://dev.to/julien786534/building-a-b2b-electronic-invoicing-api-for-french-pdp-compliance-in-2026-2p05) `devto` — 2026-04-27 - Make the product prove it can save money versus Stripe invoice fees and reduce manual work across multiple accounts. - [Show HN: A tool to simplify invoicing in Stripe](https://news.ycombinator.com/item?id=43973785) `hackernews` — 2025-05-13 - [Show HN: A tool to simplify invoicing in Stripe (invoicelyapp.com)](https://news.ycombinator.com/item?id=44463431) `hackernews` — 2025-07-04 - Differentiate around recurring SaaS billing plus cash-flow context, not just PDF invoice generation. - [Launch HN: Modernbanc (YC W20) – Modern and fast accounting software](https://news.ycombinator.com/item?id=43414405) `hackernews` — 2025-03-19 - [Best invoicing software for startups and small businesses](https://mercury.com/blog/best-invoicing-software-for-startups-small-businesses) `tavily` - [Abdullah-Niaz/FounderOS](https://github.com/Abdullah-Niaz/FounderOS) `github` — 2026-06-01 - Validate by talking to founders already using tools like Stripe, QuickBooks, Wave, Bonsai, or Zoho, because those are the real alternatives in the signals. - [What are The Best Invoicing Software For B2B SaaS Startups?](https://turnstile.ai/blog/invoicing-software) `tavily` - [Show HN: A tool to simplify invoicing in Stripe](https://news.ycombinator.com/item?id=43973785) `hackernews` — 2025-05-13 - [Question for Freelancers](https://news.ycombinator.com/item?id=20821495) `hackernews` — 2019-08-28 - [10 Best Invoicing and Billing Software for 2026 | Salesforce](https://www.salesforce.com/sales/revenue-lifecycle-management/billing-software) `tavily` ## Domain names - `invoicingbilling.com` — available - `invoicingbilling.io` — available - `invoicing.com` — taken - `getinvoicing.com` — taken --- Sources searched: hackernews (30), github (18), githubissues (none), discourse (1), intent (none), stackexchange (none), registries (15), tavily (7), devto (10) Generated by Shows Its Work — https://showsitsworks.com/idea/an-invoicing-tool-for-saas-founders Findings link to their sources. Estimates are marked as estimates.