Comparison

Simple Invoice Maker & Receipt vs Invoice Maker by SPK

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

Head to head
About

Simple Invoice Maker & Receipt

Streamline your business finances by creating and sending professional invoices, estimates, and receipts. Manage inventory, track payments, and generate reports for easier tax filing. Get paid faster with integrated payment options.

Highlights
  • Create professional invoices, estimates, and receipts
  • Manage inventory with low stock reminders
  • Accept online and in-person payments
  • Track partial payments and deposits
  • Generate reports for bookkeeping and tax filing
  • Cloud-based data storage
  • Multi-currency and multi-language support
Features
Read full description

Create, send & track invoices, estimates, receipts & inventory on your phone and keep your finances organized. Send the invoice before you leave your customer. SIR helps you create professional invoices, estimates and receipts in seconds. Introducing the most user-friendly and quick invoicing app you’ll ever use. Manage your whole invoicing game and inventory management from this single platform. SIMPLE INVOICE MAKER Make professional invoices easily in a few simple steps. Include your company logo, brand color, and information with our templates. Stay organized with our invoice tracker by sending invoices quickly via email or other messaging tool and receive notices once they read your messages. INVENTORY MANAGEMENT Discover inventory control like no other. SIR is the only app that allows users to add multiple companies and warehouses, and assign multiple users. Our inventory management makes tracking, recording, and stock updating easy and you’ll even get low stock reminders. GET PAID FASTER Accept online or in-person payments via credit card, debit card, Stripe or PayPal and get paid faster. Comparable to Square Point of Sale (POS), PayPal Business, and other payment systems. Easy Google Pay & Apple Pay options are available. PROFESSIONAL ESTIMATES MAKER Create professional estimates that guarantee you get the job. Our invoice maker app converts estimates to invoices with just one click. CREATE SMART RECEIPTS With our receipt maker, instantly create purchase orders and smart receipts once you receive payment. Easily keep track of all unpaid invoices so you never miss a payment. ADVANCED PAYMENTS MANAGEMENT Keep track of partial payments and deposits, and issue payment vouchers and debit/credit notes for customers. View the database of customers and suppliers in one place and keep things organized. TRACK & PAY TAXES Don’t stress about organizing or submitting your taxes for your small business! SIR gives you an easy way to trace and export reports for easier tax filing and payment. BOOKKEEPING REPORTS Stock management isn’t all we can do. You can export reports to PDF for bookkeeping and legal requirements with SIR. ADDITIONAL FEATURES - All data is cloud-based. - Add multiple currencies & view in multiple languages. - Attach photos, include payment information, payment terms, due dates, discounts, taxes, shipping details, notes, and more. - Share documents via email, WhatsApp, print or PDF. - Import customers & suppliers from your phone contacts. - Send auto-generated, professionally designed invoice reminders and thank you notes to customers - Multi-user control for your small business - Perfect to use alongside Invoice Simple, Bookipi - Billing Estimate, Invoice2go, Tiny Invoice, Easy Invoice Maker, Billdu, Zoho Inventory, QSR Inventory, Freshbooks, Xactimate, and more. Download SIR invoice maker app now. PRICING With the free tier, you get one business, one user, one invoice, one estimate, one receipt and one purchase order for free so you can try SIR before you upgrade. Then upgrade in-app for unlimited access. Subscribe to the Annual Package for $35.99 (or local equivalent) and save 70%, with a 3-day free trial. Pay $3.99 (or local equivalent) for monthly plan. Assign unlimited additional users with limited or unlimited access and add multiple businesses for free if subscribed. Automatic renewal of subscription by credit card through your iTunes account. You can turn off auto-renewal at any time. Your subscription automatically renews unless auto-renewal is turned off at least 24 hours before the expiry of the active subscription. An active subscription cannot be canceled before the subscription expires. Any unused portion of a free trial period will be forfeited when the user purchases a paid subscription. Terms of use: https://sir-app.com/terms-and-conditions/

About

Invoice Maker by SPK

Create and send professional PDF invoices and estimates quickly and easily. This ad-free, watermark-free app is ideal for small business owners, consultants, and freelancers on the go. Customize templates, track clients, and manage your billing efficiently.

Highlights
  • Create unlimited invoices and estimates
  • No ads or watermarks
  • Customizable invoice fields
  • Client list management
  • Multiple sharing options (email, WhatsApp, text)
  • Convert estimates to invoices
  • Company logo and signature upload
Features
Read full description

Invoice Maker+ is the #1 invoice app available today! It is an award-winning business utility app with NO ADS and NO WATERMARKS. It is the ideal on-the-go mobile solution for small business owners, consultants, contractors, and freelancers in all industries! Our easy-to-use generator allows you to create and send professional PDF invoices and estimates to your customers within seconds. Create invoices and estimates wherever you are! You can send an invoice while in the office, home, car, and even while you are still with your customer! Share via email, WhatsApp, text, print, and more! Our professionally designed template is sophisticated, clean, modern, and attractive, and the customization features allow you to add as much level of detail as you’d like! --- Features: * Create and Share UNLIMITED invoices and estimates with NO ADS and NO WATERMARKS * Select your region preference to customize your currency and date format * Preview via PDF while the invoice or estimate is being created * Customize invoice fields including billing date, due date, item name, item description, quantity, rate, item discount, shipping, tax, overall discount, etc. * Create, track, and store your client list * Deliver via customized email, whatsapp, text, messenger, print, and more * Track and organize your invoices and estimates using our filters and labels (“Outstanding”, “Paid”, “Open”, and “Closed”) * Upload a company logo to personalize your invoices and estimates * Include personal signature * Add payment details (bank transfer, check payable, paypal email) * Convert estimates to invoice with the press of a button * Duplicate an existing invoice or estimate with the press of a button (major time-saver for recurring customers!) * Mark an invoice or estimate as “Draft” if still a work in progress * Store and organize your invoices in one place so filing taxes is quick and easy * Automatically add names to your client list from your phone contacts * Add any additional notes you wish, such as payment terms, company policy, a “Thank You” note, etc. --- Privacy Policy: https://www.iubenda.com/privacy-policy/17124454 Terms and Conditions: https://www.iubenda.com/terms-and-conditions/17124454

Screenshots

Simple Invoice Maker & Receipt4 screens
Invoice Maker by SPK4 screens

Verdict

The call

The clearest difference is rating: Invoice Maker by SPK at 4.8 against Simple Invoice Maker & Receipt's 4.1. Invoice Maker by SPK also leads on update cadence (weekly vs monthly) and ratings volume (911 vs 35). Simple Invoice Maker & Receipt's advantage is iOS requirement (11.0 vs 13.0). On price, review sentiment, ads and in-app purchases 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. Simple Invoice Maker & Receipt sells 5 in-app purchases, starting at $3.99 per month and Invoice Maker by SPK sells 9 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Invoice Maker by SPK holds the better App Store score, 4.8 against 4.1. That said, the two scores are not equally well evidenced: Invoice Maker by SPK has 911 ratings behind it against 35, so its average is the more settled of the two. Written reviews split almost evenly too, at 74% and 73% positive.

UpkeepUpdate frequency

Simple Invoice Maker & Receipt ships an update monthly, Invoice Maker by SPK weekly. Both last shipped on October 24, 2026.

Scorecard4 real differences · 6 level
Simple Invoice Maker & Receipt versus Invoice Maker by SPK: the parameters behind the verdict, then further details
ParameterSimple Invoice Maker & ReceiptInvoice Maker by SPK
PriceFreeFree
Rating4.1 (35 ratings)4.8 (911 ratings) — better
Positive reviews73.9% of reviews — better73.3% of reviews
Number of ratings35911 — better
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.0 — better13.0
Further details — not scored
Size30 MB30 MB
Age rating4+4+
DeveloperSK Tech Systems LLCSPK Studios LLC

Customer experience

Simple Invoice Maker & Receipt

All ratings35 ratings
Positive77.1%
Neutral5.7%
Negative17.1%
Written reviews23 reviews
Positive73.9%
Neutral4.3%
Negative21.7%

Invoice Maker by SPK

All ratings906 ratings
Positive95.6%
Neutral1.4%
Negative3.0%
Written reviews30 reviews
Positive73.3%
Neutral10.0%
Negative16.7%

Bugs and requests

Simple Invoice Maker & Receipt

Not enough reviews yet to summarise bugs or requests.

Invoice Maker by SPK

Reported bugs

2 issues
  • Invoices not updating correctly
  • Inability to unsubscribe from paid features

Requested features

3 requests
  • Ability to sync data across devices
  • Increased character limit for item descriptions
  • Improved customer support

In-app purchases

5 purchases

Simple Invoice Maker & Receipt

Subscriptions2
  • Monthly Subscription$3.991 Month
  • Sir Invoices Annually3 Days trial$17.991 Year
One-time3
  • Buy additional companiesFree
  • Buy additional users$99.99
  • Lifetime$99.99
9 purchases

Invoice Maker by SPK

Subscriptions9
  • My Invoice Generator3 Days trial$4.991 Month
  • The Invoice Maker3 Days trial$7.991 Month
  • Invoice Maker App3 Days trial$9.991 Month
Show 6 more
  • Invoice Maker Pro3 Days trial$9.991 Month
  • Smart Invoice Maker3 Days trial$39.991 Year
  • Quick Invoice Maker3 Days trial$59.991 Year
  • Invoice Maker Professional3 Days trial$69.991 Year
  • App Invoice Maker3 Days trial$89.991 Year
  • Invoice Maker Plus3 Days trial$89.991 Year

Questions

Is Simple Invoice Maker & Receipt free?
Simple Invoice Maker & Receipt is free to download, with in-app purchases available.
Is Invoice Maker by SPK free?
Invoice Maker by SPK is free to download, with in-app purchases available.
Which has better reviews, Simple Invoice Maker & Receipt or Invoice Maker by SPK?
Invoice Maker by SPK is rated higher. Simple Invoice Maker & Receipt averages 4.1 out of 5 from 35 ratings, while Invoice Maker by SPK averages 4.8 from 911 ratings.
Do Simple Invoice Maker & Receipt or Invoice Maker by SPK have ads?
Neither Simple Invoice Maker & Receipt nor Invoice Maker by SPK shows ads.
Which is updated more often, Simple Invoice Maker & Receipt or Invoice Maker by SPK?
Simple Invoice Maker & Receipt ships an update monthly, and Invoice Maker by SPK weekly. Most recently, Simple Invoice Maker & Receipt was updated on October 24, 2026 and Invoice Maker by SPK on October 24, 2026.

Other comparisons