Comparison

Invoice Maker ▸ Invoice Simple vs FLEX PLUS

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
Currently charting
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

FLEX PLUS

This platform provides a convenient way to order from local stores and receive deliveries at your preferred location. It offers a user-friendly interface, loyalty points for discounts, and real-time order tracking. Explore a wide range of categories and enjoy personalized recommendations.

Highlights
  • Order from favorite stores
  • Delivery to preferred location
  • User-friendly registration
  • Promotions and loyalty points
  • Real-time order tracking
  • Wide range of product categories
Features
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Flex Delivery Plus is an excellent and comprehensive platform that caters to the needs of customers in The Virgin Islands, providing them with convenience and various benefits. Here's a summary of its key features: Ordering from your Favorite Stores: Customers can easily place orders from their preferred stores through the Flex Delivery Plus marketplace, ensuring they can get the products/ Services they love. Delivery to Preferred Location: With delivery services available, customers can receive their orders at a location of their choice, making the process convenient and hassle-free. Seamless Convenience: The app is designed to provide an effortless and streamlined delivery experience for users, available on iOS devices for wider accessibility. User-Friendly Registration: Signing up for Flex Delivery Plus is straightforward, requiring customers to create an account with their email, enabling them to explore convenient delivery solutions. All-in-One Ordering: The app serves as a one-stop shop for all delivery and service needs, allowing customers to place orders directly with vendors through the platform, ensuring prompt processing and efficient communication. Promotions and Loyalty Points: Customers can take advantage of various promotions from their favorite stores and earn loyalty points with each order. These points can later be used for discounts at any other store in the marketplace, promoting customer loyalty. Mobile and Web App Access: Offering both mobile and web applications ensure flexibility and accessibility for customers to place orders through their preferred devices. Wide Range of Categories: The platform's multiple product categories, including restaurants, supermarkets, parties & events, pharmacies, Personal services e.g. (Spas, or Barbershops etc.), Villas and much more, provide customers with a diverse selection of items from different merchants. Recommendations and Banners: The platform's personalized recommendations and banners enhance the shopping experience, helping customers discover new stores and products. Notification History: The notification history feature allows customers to review past notifications, ensuring they stay informed about the latest updates and offers. Customer Loyalty Program: Engaging customers in a loyalty program with points for every order creates a rewarding experience, encouraging repeat business. Order Tracking: Real-time order tracking with notifications at each delivery step provides transparency and convenience, keeping customers informed about their delivery progress. In conclusion, Flex Delivery Plus offers a comprehensive and user-friendly platform that aims to make ordering from favorite stores and exploring new options easy and rewarding for customers in The Virgin Islands. The platform's delivery services, loyalty program, and various features contribute to a seamless shopping and delivery experience for its users.

Screenshots

Invoice Maker ▸ Invoice Simple4 screens
FLEX PLUS4 screens

Verdict

The call

The clearest difference is rating: Invoice Maker ▸ Invoice Simple at 4.9 against FLEX PLUS's 1.0. Invoice Maker ▸ Invoice Simple also leads on update cadence (every 11 days vs every 46 months) and ratings volume (123K vs 1). FLEX PLUS's advantage is in-app purchases (none vs 11) and iOS requirement (10.0 vs 15.1). On price, ads and device support 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. FLEX PLUS asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Invoice Maker ▸ Invoice Simple holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Invoice Maker ▸ Invoice Simple has 123K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Invoice Maker ▸ Invoice Simple ships an update every 11 days, FLEX PLUS every 46 months. The most recent releases landed on October 14, 2026 and September 23, 2026 respectively.

Scorecard7 real differences · 4 level
Invoice Maker ▸ Invoice Simple versus FLEX PLUS: the parameters behind the verdict, then further details
ParameterInvoice Maker ▸ Invoice SimpleFLEX PLUS
PriceFreeFree
Rating4.9 (123K ratings) — better1.0 (1 ratings)
Positive reviews63.8% of reviews—
Number of ratings123K — better1
Update frequencyEvery 11 days — betterEvery 46 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#9 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.110.0 — better
Further details — not scored
Size223 MB11 MB
Age rating4+4+
DeveloperZenvoice Inc.FLEX-ING HOLDINGS LIMITED

Customer experience

Invoice Maker ▸ Invoice Simple

All ratings122,790 ratings
Positive97.5%
Neutral1.6%
Negative0.9%
Written reviews1,585 reviews
Positive63.8%
Neutral6.1%
Negative30.1%

FLEX PLUS

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

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

FLEX PLUS

Not enough reviews yet to summarise bugs or requests.

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
None

FLEX PLUS

No in-app purchases

Questions

Is Invoice Maker ▸ Invoice Simple free?
Invoice Maker ▸ Invoice Simple is free to download, with in-app purchases available.
Is FLEX PLUS free?
FLEX PLUS is free to download, with no in-app purchases.
Which has better reviews, Invoice Maker ▸ Invoice Simple or FLEX PLUS?
Invoice Maker ▸ Invoice Simple is rated higher. Invoice Maker ▸ Invoice Simple averages 4.9 out of 5 from 123K ratings, while FLEX PLUS averages 1.0 from 1 ratings.
Do Invoice Maker ▸ Invoice Simple or FLEX PLUS have ads?
Neither Invoice Maker ▸ Invoice Simple nor FLEX PLUS shows ads.
Which is updated more often, Invoice Maker ▸ Invoice Simple or FLEX PLUS?
Invoice Maker ▸ Invoice Simple ships an update every 11 days, and FLEX PLUS every 46 months. Most recently, Invoice Maker ▸ Invoice Simple was updated on October 14, 2026 and FLEX PLUS on September 23, 2026.

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