Nafya Products · SaaS
Invoicing that takes minutes, not spreadsheets.
Stack is a lightweight invoicing system for freelancers and small businesses. Enter your work, watch the invoice build itself, and send a clean PDF your client can actually read.
- Runs in the browser
- PDF ready
- Built in Tanzania
- Built for
- Small teams
- First invoice
- Under 2 min
- Output
- Shareable PDF
- Invoices
- Quotations
- Line Items
- Tax & Discounts
- Client Records
- PDF Export
- Payment Terms
- Multi-Currency
How Stack works
Three steps between a finished job and a sent invoice.
No setup project, no onboarding call, no accounting degree. Stack keeps the surface small on purpose so the thing you came to do is the thing you finish.
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01
Enter the work
Add your client, your line items, and your rates. Stack handles the arithmetic, the tax line, and the running total as you type.
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02
See it take shape
The invoice previews live beside the form, so what you are looking at is exactly what your client will receive. No guessing, no surprise formatting.
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03
Send the PDF
Download a clean, professional PDF and send it however you already talk to your clients, whether that is email, WhatsApp, or a printed copy.
Who it is for
Made for the people who invoice between doing the actual work.
Stack is deliberately small. If you bill a handful of clients each month and full accounting software is more system than you need, this is the tool that fits.
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01
Freelancers
Designers, developers, writers, and photographers billing per project or per retainer.
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02
Small businesses
Shops and service providers who need a professional document without a finance department.
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03
Consultants
Advisors and trainers invoicing by day rate, session, or milestone.
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04
Contractors
Technicians and trades who quote first, then bill against the agreed scope.
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05
Small agencies
Teams of two to ten who want consistent invoices across everyone who sends them.
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06
Side businesses
Anyone turning occasional work into paid work and needing to look established doing it.
Why we built it
Getting paid should not be the hardest part of the job.
Most invoicing tools are built for finance teams and priced for them too. We kept meeting people doing good work who were still assembling invoices by hand in a word processor, renumbering them by memory, and rechecking the maths every time. Stack is our answer to that: the smallest useful tool, made properly.
Open StackQuestions
Before you open it.
If something here is not answered, reach the team directly and a person will reply.
Contact Nafya ConsultDo I need to install anything?
No. Stack runs in your browser, so it works the same on a laptop in the office and a phone on site.
Can I use my own currency?
Yes. Stack is built with Tanzanian shillings in mind but handles other currencies for clients who bill internationally.
Will my invoices carry my own branding?
Your business name and details sit at the top of every invoice, so the document reads as yours rather than as a template.
Is this a replacement for accounting software?
It is not, and that is intentional. Stack covers creating and sending invoices cleanly. If you need full bookkeeping, payroll, or statutory reporting, talk to us about a system built around how your business actually runs.
Can Stack be customised for my business?
Yes. Nafya Consult builds custom business systems, so if Stack is close but not quite right, we can extend it or build around it. Start with a conversation.
Ready when you are
Send your next invoice in the next five minutes.
Open Stack, add your first client, and see how far you get before you need to ask anyone anything.