Comparison

Invoice Maker ▸ Invoice Simple vs Estimate Maker Flex

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Invoice Maker ▸ Invoice Simple

Create and send professional invoices, estimates, and receipts quickly from your mobile device. This app helps individuals and growing businesses get organized, look professional, and get paid faster by accepting online payments.

Highlights
  • Create invoices, estimates, and receipts
  • Send documents via email, text, or WhatsApp
  • Accept online payments
  • Customize invoices with logo and business details
  • Track invoice status and get payment reminders
  • Organize client and product information
Read full description

Easily create & send professional invoices, estimates, and receipts on the go! The perfect tool for individuals and growing businesses that lets you quickly create a document on the spot while with your customer. For growing businesses who want: · A simple way to make estimates, invoices, and receipts fast · Professional-looking invoices that you can send from your mobile device · An easy way to accept online payments and stop chasing checks From a landscaping invoice or estimate to a receipt for entertainment supplies in your side gig, Invoice Simple is the app for your small business. START YOUR FREE TRIAL 6 WAYS INVOICE SIMPLE MAKES YOUR LIFE AS A BUSINESS OWNER EASIER 1. SIMPLE TO USE Designed to make sure you never have to waste time “figuring out” how to make it work. 2. INVOICE ANYWHERE Standing next to your client, in your truck, or sitting at your desk, there’s no quicker way to send an invoice. 3. GET ORGANIZED Keeping track is effortless. Your entire history is collected in one place, easy to find and read. Taxes are a breeze. 4. LOOK MORE PROFESSIONAL Create professional-looking invoices and estimates on the spot. 5. GET PAID FASTER Making it easy to get paid by accepting cards with simple fee structure and low rates that you can add to an invoice - no cost to you, as well as accept checks and cash. 6. INVOICE WITH CONFIDENCE Join hundreds of thousands of small businesses who rely on Invoice Simple, consistently a top-rated invoicing app. Easily customize every aspect of your invoice, estimate, or receipt: 1. Add your logo and business details 2. Include your banking details 3. Easy-add and import client details saved in your phone contacts 4. Customize tax and add discounts 5. Accept credit card payment with simple fee structure and low rates that you can add to an invoice - no cost to you, as well as accept checks and cash 6. Add product information and attach photos 7. Include your signature Send your invoice or estimate by email, text, WhatsApp, or download it as a PDF. Get instant alerts when it's opened, paid, or is overdue with instant mobile device and email notifications. You don’t have to limit yourself to cash and checks. Just select “accept online payments” and follow the simple steps to hook up your invoices to Invoice Simple Payments. PLANS: Start with a free trial, then choose the best plan for your business: Essentials For entrepreneurs to easily start sending estimates, invoices, receipts, and receive payments. · Up to 3 invoices per month · QR code payments · Online payments · Real time read receipts · Expense tracking · Top rated mobile and web apps Plus For small businesses to send nice-looking, easy to create documents on-the-go. Everything in Essentials, plus: · Up to 10 invoices per month · Add photos · Business owner signature · Autofill client & item info · Due date reminders Premium For small businesses to improve invoice organization and make online payments easy. Everything in Plus, along with: · UNLIMITED invoices per month · Customer support 1st response priority Invoice Simple, the ultimate invoice, receipt, & estimate maker: Send simple invoices using professional templates, invoice generator, PDF invoices and quotes, online payments, bill organizer, receipt and expense tracking, and business reporting—all rolled up into one easy-to-use app. When it's time to create an estimate, invoice, or receipt for your small business, Invoice Simple will work for you. Terms of use: https://www.invoicesimple.com/terms Privacy policy: https://www.invoicesimple.com/privacy

About

Estimate Maker Flex

Create and send professional estimates quickly and easily. Convert estimates to invoices with a single tap. Customize titles, currencies, and date formats for a personalized touch. Works offline and supports multiple templates.

Highlights
  • Create and send estimates
  • Convert estimates to invoices
  • Customizable titles and subtitles
  • Multi-currency support
  • Multiple date formats
  • Offline functionality
  • Professional templates
Features
Read full description

Create and send professional estimates on the spot. Turn estimates into invoices by a single tap. Close more business deals. How it works * Enter your info * Add customers manually or from Contacts * Add your products / services After that, you can create and send professional estimates instantly. Flexibility * Manually edit titles (e.g. Estimate -> estimación, Quote) * Manually edit subtitles (e.g. Billing address -> Bill to, Signature -> Approved by) * Multi-currencies (e.g. \$, £, ... Manually enter your currency code) * Date format (e.g. 04/18/2019, 18/04/2019, 18/Apr/2019) * Works without the internet * Import contacts from your existing contacts or manually create them * Payment term set up based on each customer (7 days by default) * Decimal hours or quantity supported * Five professionally designed beautiful templates * Delete items (e.g. Estimates, products, customers) by swiping to the left * Edit existing documents * Add signature and date on the spot * Icon, Signature, Note, Other comments fields won't appear if nothing is entered * Preview estimates before sending them as a PDF * Send as a PDF or print wirelessly * Create 5 estimates for free Professional Features * Add business registration name (ABN etc.) and number * Tax, GST, VAT set up (e.g. No tax, single tax, compound tax) * Add discount (Actual \$ or %) * Payment terms (Immediate, 7 days, 14 days, 21 days,... up to 180 days) * Add your company logo ### Mobility * Send directly from iPhone and iPad * Your personal estimate system in your pocket ### Upgrade to Subscription Version The subscription version offers cloud sync and backup features so that you can save all the info in our highly secured cloud services and share the same data across multiple iOS devices. Upgrading to the subscription version requires auto-renewal subscription. Payment will be charged to your Apple ID account at the confirmation of purchase. The subscription automatically renews unless it is canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Links to Your Privacy Policy and Terms of Use: http://www.btoj.com.au/privacy.html http://www.btoj.com.au/terms.html Please feel free to contact us for anything. Simplify your life now.

Screenshots

Invoice Maker ▸ Invoice Simple4 screens
Estimate Maker Flex4 screens

Verdict

The call

Invoice Maker ▸ Invoice Simple and Estimate Maker Flex both sit at 4.9 stars, but that hides the real split: 97% of Estimate Maker Flex's written reviews are positive against 64% of Invoice Maker ▸ Invoice Simple's. Estimate Maker Flex also leads on iOS requirement (13.0 vs 15.1). Invoice Maker ▸ Invoice Simple's advantage is ratings volume (123K vs 101) and chart position (#9 vs unranked). On price, rating, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Invoice Maker ▸ Invoice Simple sells 9 in-app purchases, starting at $6.99 per month and Estimate Maker Flex sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Invoice Maker ▸ Invoice Simple against 4.8 for Estimate Maker Flex. That said, the two scores are not equally well evidenced: Invoice Maker ▸ Invoice Simple has 123K ratings behind it against 101, so its average is the more settled of the two. Written reviews are what separate them: 64% of Invoice Maker ▸ Invoice Simple's written reviews are positive against 97% of Estimate Maker Flex's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 9 days. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 7 level
Invoice Maker ▸ Invoice Simple versus Estimate Maker Flex: the parameters behind the verdict, then further details
ParameterInvoice Maker ▸ Invoice SimpleEstimate Maker Flex
PriceFreeFree
Rating4.9 (123K ratings) — better4.8 (101 ratings)
Positive reviews63.9% of reviews97.2% of reviews — better
Number of ratings123K — better101
Update frequencyEvery 9 daysEvery 9 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#9 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.113.0 — better
Further details — not scored
Size209 MB99 MB
Age rating4++4
DeveloperZenvoice Inc.B TO J PTY LTD

Customer experience

Invoice Maker ▸ Invoice Simple

All ratings122,755 ratings
Positive97.5%
Neutral1.6%
Negative0.9%
Written reviews1,579 reviews
Positive63.9%
Neutral6.1%
Negative30.0%

Estimate Maker Flex

All ratings101 ratings
Positive95.0%
Neutral4.0%
Negative1.0%
Written reviews71 reviews
Positive97.2%
Neutral0.0%
Negative2.8%

User reviews

Invoice Maker ▸ Invoice Simple

From 123K App Store ratings

What we love

  • 🚀 Easy to use
  • 👍 Professional-looking invoices
  • 🚀 Quick and simple
  • 👍 Saves time
  • 👍 Convenient mobile access

Room to improve

  • 💰 Expensive subscription
  • 🐛 Glitches and bugs
  • 🔀 Inconsistent features across platforms
  • 🔀 Confusing navigation
  • 🔀 Limited customization options

Estimate Maker Flex

From 101 App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Efficient for creating estimates
  • 👍 Practical and functional
  • 👍 Professional-looking estimates
  • 👍 Helpful for business growth

Room to improve

  • ❓ Translation not complete
  • ❓ A little difficult to understand initially
  • 🐛 App not opening

Bugs and requests

Invoice Maker ▸ Invoice Simple

Reported bugs

4 issues
  • Invoices not sending properly
  • App crashing or freezing
  • Inability to recover deleted invoices
  • Syncing issues between mobile and desktop

Requested features

6 requests
  • Add ability to rearrange line items
  • Improve search and filtering capabilities
  • Integrate with accounting software
  • Add option to track expenses and profitability
  • Allow multiple business profiles in one account
Show 1 more
  • Improve mobile and desktop app parity

Estimate Maker Flex

Reported bugs

1 issue
  • App not opening

Requested features

2 requests
  • Add option to get client signature
  • Add signature of the person who made the estimate

In-app purchases

9 purchases

Invoice Maker ▸ Invoice Simple

Subscriptions9
  • Essentials Monthly$6.991 Month
  • Mobile subscription$10.991 Month
  • Monthly Side Business$10.991 Month
Show 6 more
  • Monthly Business Sub$11.991 Month
  • Monthly Subscription$11.991 Month
  • Monthly subscription2 variants$13.491 Month
  • Plus Monthly$14.991 Month
  • Monthly Standard Subscription$17.991 Month
  • Premium Monthly$21.991 Month
2 purchases

Estimate Maker Flex

Subscriptions2
  • 1 Month Subscription$5.991 Month
  • 1 Year Subscription$49.991 Year

Questions

Is Invoice Maker ▸ Invoice Simple free?
Invoice Maker ▸ Invoice Simple is free to download, with in-app purchases available.
Is Estimate Maker Flex free?
Estimate Maker Flex is free to download, with in-app purchases available.
Which has better reviews, Invoice Maker ▸ Invoice Simple or Estimate Maker Flex?
Invoice Maker ▸ Invoice Simple is rated higher. Invoice Maker ▸ Invoice Simple averages 4.9 out of 5 from 123K ratings, while Estimate Maker Flex averages 4.8 from 101 ratings.
Do Invoice Maker ▸ Invoice Simple or Estimate Maker Flex have ads?
Neither Invoice Maker ▸ Invoice Simple nor Estimate Maker Flex shows ads.
Which is updated more often, Invoice Maker ▸ Invoice Simple or Estimate Maker Flex?
Invoice Maker ▸ Invoice Simple ships an update every 9 days, and Estimate Maker Flex every 9 days. Most recently, Invoice Maker ▸ Invoice Simple was updated on September 24, 2026 and Estimate Maker Flex on September 22, 2026.

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