BillKit and Invoice Simple both help small businesses produce professional invoices and estimates, but they’re built for different jobs. Invoice Simple is an invoicing app with accounts, sending, tracking and payments. BillKit is a no-sign-up document generator that runs in your browser. This page compares them honestly so you can pick the right one.
Disclosure: BillKit is our product. Invoice Simple’s features and prices change; this comparison reflects our understanding as of October 2026. Check invoicesimple.com for current plans.
At a glance
| BillKit | Invoice Simple | |
|---|---|---|
| What it is | In-browser invoice, quote and receipt generator | Invoicing app for mobile and web |
| Account required | No | Yes |
| Where your data lives | In your browser only | Their cloud, synced across devices |
| Documents | Invoices, quotes/estimates, receipts | Invoices and estimates |
| PDF download | Yes, unlimited, free | Yes |
| Send by email/text from the app | No — you download and send yourself | Yes |
| “Viewed” notifications | No | Yes |
| Online card payments | No | Yes (with processing fees) |
| Reports and client tracking | Basic: local history with paid/unpaid status | Yes |
| Mobile | Mobile-friendly website | Native iOS and Android apps |
| Languages / currencies | 11 interface languages; 150+ currencies | Check their site for supported languages and currencies |
| Pricing model | Free; optional Pro (monthly or one-time) | Subscription after limited free use/trial |
Where Invoice Simple is the better choice
Be honest with yourself about how you work. Invoice Simple is likely better if:
- You invoice from your phone on job sites and want a native app.
- You want to send invoices directly by email or text and see when clients open them.
- You want clients to pay by card from the invoice itself.
- You need your invoices on several devices without thinking about it.
- You want reporting on paid and unpaid invoices over time.
Those features require an account, cloud storage and a subscription — which is a fair trade if you use them every day.
Where BillKit is the better choice
BillKit is likely better if:
- You don’t want to create an account or pay a subscription to produce a professional PDF.
- Privacy matters — documents are created in your browser and aren’t uploaded to our servers.
- You need quotes and receipts as well as invoices, all free: invoice generator, quote generator, receipt generator.
- You work across languages or currencies — the interface is available in 11 languages and supports 150+ currencies, plus two taxes for systems like CGST/SGST.
- You invoice occasionally and a subscription isn’t worth it.
- You already have a payment method (bank transfer, a payment link) and just need the document.
Feature notes
Creating documents
Both tools offer a straightforward form with business and client details, line items, tax, discounts and notes. BillKit also has a signature field, A4/Letter paper sizes, deposits/amount paid, and ready-made samples for receipt types and quote types that prefill the generator.
Sending and getting paid
This is the biggest difference. Invoice Simple handles delivery and payment. With BillKit you download the PDF and send it from your own email — our guide on how to send an invoice by email has templates — and you add your own bank details or payment link.
Records
Invoice Simple keeps your invoices in its cloud. BillKit keeps a history in your browser (the free tier shows the 3 most recent; Pro unlocks full history and CSV export). Clearing your browser data deletes it, so download PDFs and keep your own records.
Branding and templates
BillKit’s free PDFs carry a small “Made with BillKit” footer and offer 3 templates; Pro removes the footer and unlocks all templates and custom colours. Check Invoice Simple’s current plans for its template and branding options.
Cost
BillKit’s free tier has no time limit or document cap. Pro is optional and offered monthly or as a one-time payment — see pricing. Invoice Simple is subscription-based for ongoing use; check their current prices and what the free tier includes.
Three common scenarios
A plumber who invoices on site, every day. Invoice Simple’s mobile app, client list and card payments are designed for exactly this. BillKit works on a phone browser, but you’d still download the PDF and send it yourself — fine occasionally, slower at volume.
A freelancer who sends two invoices a month by email. BillKit is usually enough: create the PDF, attach it to your email (see our email templates) and track payment in your bank account. A subscription is hard to justify at that volume.
Someone who needs a receipt for a private sale or rent. BillKit’s receipt templates cover cases like car sales and rent without creating a business account.
Switching between them
Because BillKit has no account, there’s nothing to migrate: you can try it alongside Invoice Simple at any time. If you move from BillKit to an app later, continue your invoice numbering where you left off and keep your existing PDFs as records. Moving the other way, export or download your invoices from Invoice Simple before cancelling a subscription.
Frequently asked questions
Can I use BillKit on my phone? Yes — it’s a responsive website, not a native app. For heavy daily mobile use, a native app is more convenient.
Does BillKit store my clients? Pro saves clients and line items in your browser for reuse; nothing is stored on our servers.
Which looks more professional? Both produce clean, professional invoices. What clients notice most is clarity: correct details, specific line items and an explicit due date.
Verdict
- Daily invoicing from a phone, with sending, tracking and card payments → Invoice Simple.
- Free, private, no-account PDFs for invoices, quotes and receipts → BillKit.
Many people use a generator like BillKit while they’re starting out and move to an app or invoicing system once volume justifies a subscription. Either way, the content of the invoice matters most — see what to include on an invoice. For a broader view, read our roundup of free invoice generators.