Invoice & estimate maker for iPhone and Android
Send invoices from your phone. Get paid faster.
Invoiceflint is the invoice app for freelancers, contractors, and small businesses. Create a professional invoice or estimate in a minute, send it by email or WhatsApp, and get notified the moment your client opens it.
- Free to download
- Free trial of Pro
- Clients need no app
Lumen Studio ▾
Invoices
Paid this month
$4,770.00
Lighthouse Media
DraftINV-1048
$3,667.30
Bluebird Cafe
ViewedINV-1046
$1,302.00
Harbor & Lane
OverdueINV-1045
$1,898.75
Olive & Co.
PaidINV-1047
$4,557.00
Meridian Health
SentINV-1044
$3,255.00
Invoice INV-1046 viewed now
Bluebird Cafe just opened your invoice.
- to create and send an invoice
- 1 minto create and send an invoice
- ways to send: link, email, WhatsApp, PDF, print
- 5ways to send: link, email, WhatsApp, PDF, print
- professional invoice templates
- 14professional invoice templates
- app languages, plus your currency
- 10app languages, plus your currency
The invoice app that tells you when clients open your invoice
Invoiceflint is an invoice and estimate maker app for iPhone and Android, built for freelancers, contractors, and small businesses. You create professional invoices and estimates on your phone, send them by link, email, WhatsApp, or PDF, and get notified the moment a client opens them. Clients view, download, and accept estimates in any browser without installing an app. Invoiceflint is free to download; Invoiceflint Pro, which starts with a free trial, unlocks unlimited sending, 14 invoice templates, automatic payment reminders, signatures, and multi-business support.
Take the tour
From first invoice to paid, all on your phone
Add your client and line items — quantities, rates, discounts, and tax calculate themselves, and invoice numbers are assigned for you. Your logo goes on every document.
- Totals, tax, and numbering done for you
- Your business logo on every invoice
- Sign on screen and attach photos
Send the invoice the way your client actually reads messages. Share a secure link through any app, email it directly, open WhatsApp with a prefilled message, send the PDF, or print it.
- Clients open it in any browser — no app or account
- Clients can download a PDF copy
- Automatic email reminders for late invoices (Pro)
Stop wondering whether your invoice landed in spam. Invoiceflint sends a push alert the second a client views an invoice or replies to an estimate — so you follow up at the right time, not on a hunch.
- Instant alerts when an invoice is viewed
- Alerts when an estimate is accepted or declined
- No noise — only the notifications that matter
Send a professional estimate, let the client accept it online, and convert it to an invoice with one tap. Line items, client details, and totals carry over — nothing to retype.
- Clients accept or decline estimates online
- One-tap estimate-to-invoice conversion
- Tax and totals calculated automatically
Every invoice moves through Draft, Sent, Viewed, and Paid. Overdue invoices are flagged with how many days late they are, and every client shows a running balance due.
- Status for every invoice at a glance
- Overdue invoices flagged automatically
- Client balances and revenue reports
See total revenue, what's paid and unpaid, and tax collected by month and year. Export reports and client statements for your accountant.
- Paid and unpaid totals at a glance
- Tax collected by month and year
- CSV and PDF export for your accountant
Everything you need to invoice and get paid
Simple enough to use on a job site, complete enough to run your billing.
Create invoices and estimates in seconds
Build professional invoices and estimates from a clean, mobile-first form. Add line items, quantities, rates, discounts, and tax — totals and invoice numbers are handled for you.
Know the moment a client opens it
Get a push notification when a client views your invoice or replies to an estimate. No more wondering whether it landed in spam.
Paid, unpaid, overdue — at a glance
Every invoice moves through Draft, Sent, Viewed, and Paid. Overdue invoices stand out, so you know exactly who to follow up with.
Estimate to invoice in one tap
Clients accept or decline estimates online. When one is approved, convert it to an invoice with one tap — line items and totals carry over.
Send by link, email, WhatsApp, or PDF
Share a secure link through any app, email the client directly, open WhatsApp with a prefilled message, send the PDF, or print it.
Clients don't need an app
Clients open invoices and estimates in any web browser. They can view, download a PDF, or respond without installing anything or creating an account.
Record payments
Mark invoices paid as money arrives and see the balance due for every client.
Clients and saved items
Keep a client list with balances, import contacts from your phone, and reuse saved items and tax presets so repeat invoices take seconds.
Reports and tax totals
See revenue, paid and unpaid totals, and tax collected by month and year — handy at tax time.
14 invoice templates
Choose from 14 professional layouts, all carrying your business logo. The Classic layout is free; the rest come with Pro.
Automatic payment reminders
Schedule email reminders before, on, and after the due date so late invoices follow up on themselves.
Signatures and photo attachments
Sign invoices and estimates on screen, and attach photos of the work, receipts, or site conditions.
Multiple taxes
Apply more than one tax to an invoice — for example, a state and a city sales tax, or GST and PST.
Multiple businesses
Run more than one business from one account and switch between them, each with its own details, logo, and currency.
Export reports and data
Export reports and client statements as CSV or PDF for your accountant or bookkeeping software.
How to send an invoice with Invoiceflint
From finished job to sent invoice in about a minute.
- 1
Create
Add your client and line items. Quantities, rates, tax, and totals calculate themselves, and invoice numbers are assigned for you.
- 2
Send
Send a secure link by email, WhatsApp, or any app — or share the PDF. Your client opens it in any browser.
- 3
Get paid
Get notified when it's viewed, send a reminder if it's late, and mark it paid when the money lands.
Built for people who bill for their own work
If you finish a job and then have to sit down at a computer to bill for it, the invoice goes out late — and so does the payment. Invoiceflint lets you invoice on the spot, from the van, the studio, or the client’s doorstep. No accounting knowledge or desktop software needed.
New to invoicing? Start with how to invoice a client.
Invoice app vs. templates vs. accounting software
Word and Excel templates are fine for the odd invoice. Accounting suites are built for bookkeepers. Invoiceflint sits in between: fast, mobile, and focused on getting paid.
| Capability | Invoiceflint | Word / Excel template | Accounting software |
|---|---|---|---|
| Create and send from your phone | Yes | No | Sometimes |
| Totals, tax, and numbering done for you | Yes | No | Yes |
| Know when the client opens it | Yes | No | Sometimes |
| Clients accept estimates online | Yes | No | Sometimes |
| Automatic payment reminders | Pro | No | Often |
| Time to learn | Minutes | Minutes | Hours to days |
More detail in free invoice template vs. an invoice app.
Start free. Upgrade when you’re ready to send.
Download Invoiceflint for free and set up your business. Pro starts with a free trial, and you can cancel anytime from your App Store or Google Play account.
Free
Download the app, set up your business, and create and preview as many invoices and estimates as you like.
- Unlimited invoice and estimate drafts
- Classic invoice template with your logo
- Clients, saved items, and tax presets
- Reports and tax totals
- Works offline — no account needed to start
Pro
Free trialEverything in Free, plus unlimited sending and the tools that get you paid faster. Start with a free trial; cancel anytime in your App Store or Google Play subscriptions.
- Unlimited sending of invoices and estimates
- Real-time alerts when clients view or respond
- All 14 invoice templates
- Automatic email payment reminders
- Signatures and photo attachments
- Multiple taxes and multiple businesses
- Export reports and client statements (CSV, PDF)
Plan prices are shown in the app in your local currency. Pricing details →
Invoicing guides
Practical advice on billing clients and getting paid on time.
How to Invoice a Client: A Step-by-Step Guide
Learn how to invoice a client step by step: what to include, how to send it from your phone, and how to follow up so you get paid on time.
Read guide →Estimate vs. Invoice: What's the Difference?
Estimates and invoices look similar but do different jobs. Here's when to send each one — and how to turn an approved estimate into an invoice.
Read guide →How to Get Paid Faster as a Freelancer
Practical ways freelancers can get paid faster: clear payment terms, deposits, read receipts, and a simple follow-up routine that shortens payment times.
Read guide →Free Invoice Template vs. Invoice App: Which Should You Use?
Free invoice template or invoice app? Compare cost, time per invoice, and payment tracking, plus a decision table and a checklist for using a template.
Read guide →Invoice Payment Terms Explained: Net 30, Due on Receipt
What Net 7, Net 30, due on receipt, and other invoice payment terms mean, which get you paid fastest, and the exact wording to put on your invoice.
Read guide →How to Follow Up on an Unpaid Invoice (With Templates)
A simple follow-up schedule for unpaid invoices, plus copy-and-paste reminder messages for email, text, and WhatsApp that stay polite and get results.
Read guide →How to Write an Estimate for a Job (That Clients Approve)
What to include in a job estimate, how to price the work, and how to send it so clients say yes. Includes a worked example estimate you can copy.
Read guide →How to Ask for a Deposit (and Invoice It Properly)
When to ask clients for a deposit, how much to charge, what to say, and exactly how to show the deposit as a credit on the final invoice.
Read guide →How to Charge Late Fees on Invoices
How to add a late payment fee to your invoices, how much to charge, the wording to use, and how to enforce it without losing the client.
Read guide →Invoice vs. Receipt: What's the Difference?
An invoice asks for payment; a receipt confirms it. See what each one includes, when to send it, and whether your business needs both documents.
Read guide →How to Send an Invoice on WhatsApp
Step by step: how to send a professional invoice to a client on WhatsApp, as a link or a PDF, plus a ready-to-send message you can copy and paste.
Read guide →How to Invoice for Labor and Materials (Plus Markup)
How trades and contractors should list labor and materials on an invoice, how to calculate materials markup, and how to handle tax.
Read guide →How to Number Invoices: Simple Systems and Examples
Why invoice numbers matter, the most common invoice numbering systems with examples, and how to fix a mistake or a skipped number without any trouble.
Read guide →Can You Send an Invoice Through Zelle, Venmo, or Cash App?
Zelle, Cash App, and Chime can't send invoices, and Venmo only can from a business profile. Here's how to invoice clients who pay with these apps.
Read guide →How Much to Charge for House Cleaning (2026 Prices)
Most US house cleaners charge $25–$50 an hour or $118–$238 a visit. See 2026 prices by home size, add-on rates, and how to work out your own rate.
Read guide →
Frequently asked questions
What is Invoiceflint?
Invoiceflint is an invoice and estimate maker app for iPhone and Android. Freelancers, contractors, and small businesses use it to create professional invoices and estimates on their phone, send them by link, email, WhatsApp, or PDF, and get notified the moment a client opens them.
Is Invoiceflint free?
Invoiceflint is free to download, and you can create and preview unlimited invoices and estimates for free. Invoiceflint Pro unlocks unlimited sending, all 14 invoice templates, automatic payment reminders, signatures, attachments, and multiple businesses. Pro starts with a free trial, and prices are shown in the app in your local currency.
What is the best invoice app for freelancers and contractors?
The best invoice app is one you'll actually use right after finishing a job — which usually means one on your phone. Invoiceflint is built mobile-first for freelancers and contractors: you can create and send an invoice in under a minute, see when the client opens it, and send automatic reminders if it's overdue.
How do I know when a client views my invoice?
Invoiceflint sends you a push notification the moment a client opens your invoice or responds to an estimate. Each invoice's status moves through Draft, Sent, Viewed, and Paid, so you always know whether to wait or follow up.
Do my clients need to install an app?
No. Clients open your invoice or estimate through a secure link in any web browser. They can view it, download a PDF, and accept or decline an estimate without installing an app or creating an account.
Can I turn an estimate into an invoice?
Yes. Clients can accept an estimate online, and you can convert an approved estimate into an invoice with one tap. The line items, client details, and totals carry over automatically.
How can I send an invoice from my phone?
In Invoiceflint, create the invoice, tap Send, and choose how to deliver it: share a secure link through any app, email it to the client directly, open WhatsApp with a prefilled message, send the PDF file, or print it.
Does Invoiceflint work in my currency and language?
Invoiceflint lets you choose your business currency, and the app is available in English, Spanish, French, German, Italian, Portuguese, Japanese, Korean, Chinese, and Arabic.
Does Invoiceflint work offline?
Yes. Invoiceflint stores your invoices on your device, so you can create and edit them without a connection. You can even start without an account; create one later to back up your data and sign in on other devices.
Does Invoiceflint work on both iPhone and Android?
Yes. Invoiceflint is available on the Apple App Store for iPhone and iPad and on Google Play for Android phones and tablets.
Still have a question? Contact support.
Send your next invoice from your phone.
Download Invoiceflint for iPhone or Android and create your first invoice in under a minute.