Comparison

Invoice Maker & Estimate App vs Lock

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

Head to head
About

Invoice Maker & Estimate App

Create professional invoices, estimates, and receipts quickly. Automate payment tracking, send smart reminders, and accept various payment methods. Streamline your business accounting and reporting with secure cloud sync.

Highlights
  • Professional invoice creation
  • Automated payment tracking
  • Smart payment reminders
  • Accept various payment methods
  • Generate PDF reports
  • Secure cloud sync
Features
Read full description

*** Bookipi just won Gold in the 2026 June Award Contest for Best Mobile App (Monthly Contest) from Best Mobile App Awards — bestmobileappawards.com/app-submission/invoice-maker-estimate-app. *** Run your business with Bookipi's award‑winning invoice maker, built for fast, reliable invoicing, estimates, and receipts. Join over 2,500,000 businesses in 150+ countries who trust Bookipi to manage invoicing and payments—risk-free for your first 3 documents. What Can Businesses Do on Bookipi with Invoice Maker & Estimates App? Bookipi's invoice app simplifies your business accounting by automating invoices, estimates, and payment tracking. • Quick & Easy Invoice Maker App: Build branded, professional invoices, quotes, and receipts in under two minutes. • Automated Payment Tracking: Stay on top of your income with real-time notifications when invoices are sent, viewed, paid, or overdue. • Smart Reminders & Fast Payments: Bookipi automatically notifies clients on overdue invoices so you get paid on time. Accept payments via credit cards, PayPal, and contactless payments. • Professional Invoice Templates: Choose from a wide range of customizable invoice templates for every business type—trades, freelancers, consultants, and more. • Effortless Tax and Reporting: Generate organized PDF reports by month, customer, or item for easy accounting and tax filing. • Universal Compatibility: Perfect for freelancers, contractors, and small businesses in any industry—invoice for services, products, or milestones. • Seamless Proposals & Recurring Billing: Create proposals, convert them to invoices, and automate recurring invoices for ongoing clients. • Secure & Synced: ISO 27001 certified cloud protection with multi-device sync between mobile and web. • Tap to Pay on iPhone - Available to All in USA, UK & Australia: Turn your phone into a wireless terminal to accept in-person, contactless payments with just a tap. • Best Available Payment Methods: Get paid via American Express, Visa, MasterCard, PayPal and more. Process invoices, send instant receipts, and manage transactions on one app. • One-click Receipt Maker: Send receipts right after recording a payment, keeping your clients updated and your records organized without any extra steps. Why Use Bookipi Invoice Maker & Estimate App? Bookipi is the best flexible, all-in-one invoice generator for freelancers and small businesses. We help streamline the sales process from invoice building to receiving payment. How Secure is Your Data on Bookipi? Bookipi free invoice maker runs securely on the cloud, with your data backed up and protected from third parties. Your information is locked behind your secure login credentials, and Bookipi ensures your privacy with industry-leading security practices, including ISO 27001 certification and regular audits. Who is Bookipi for? • Trades (builders, electricians, plumbers, etc.) • Creative freelancers & consultants • Food/gig delivery, e-commerce, retail, contractors • Anyone who wants simple and professional billing Other Features for Better Invoices, Estimates, and Receipts • Automatic sync between devices and web app. • Invoice hours worked, services, products, or by milestone. • Charge credit card surcharges to clients. • Import customer details from the contact list. • Make calls or send emails directly from the customer list. • Send overdue payment reminders. Try Bookipi today and experience the easiest way to send invoices, create estimates, collect payments, and grow your business—all from your iOS device. Bookipi is constantly updating its free invoice app and developing new features. If you have any problems or suggestions, chat with us on our website: https://bookipi.com/ Terms of Service: https://bookipi.com/terms-of-service/ Privacy Policy: https://bookipi.com/privacy-policy/

About

Lock

Features
Read full description

Lock-Syc is designed to work exclusively with compatible Lock-Sync BLE Tags.

Screenshots

Invoice Maker & Estimate App4 screens
Lock3 screens

Verdict

The call

The clearest difference is in-app purchases: Lock at none against Invoice Maker & Estimate App's 23. Invoice Maker & Estimate App's advantage is chart position (#106 vs unranked). On price, ads, device support and iOS requirement 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 & Estimate App sells 21 in-app purchases, starting at $7.49 per month. Lock asks for nothing beyond the download.

Scorecard2 real differences · 9 level
Invoice Maker & Estimate App versus Lock: the parameters behind the verdict, then further details
ParameterInvoice Maker & Estimate AppLock
PriceFreeFree
Rating4.9 (16K ratings) — better—
Positive reviews62.0% of reviews—
Number of ratings16K — better—
Update frequencyEvery 2 weeks—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
Best chart rank#106 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.114.0 — better
Further details — not scored
Size116 MB11 MB
Age rating4+4+
DeveloperBookipi Pty LtdLOCK N TRACK LTD

Bugs and requests

Invoice Maker & Estimate App

Reported bugs

6 issues
  • Invoices disappearing after editing
  • Inability to change bank details
  • Crashes when adding items to invoices
  • Incorrect invoice numbering
  • Compatibility issues with iOS 15
Show 1 more
  • Unresponsive 'Save' button

Requested features

6 requests
  • Inventory management feature
  • Searchable job or PO field
  • Ability to see overdue invoices easily
  • Option to turn quotes into invoices
  • Customizable logo and branding
Show 1 more
  • Improved mobile experience

Lock

Not enough reviews yet to summarise bugs or requests.

In-app purchases

21 purchases

Invoice Maker & Estimate App

Subscriptions21
  • Unlimited Documents$7.491 Month
  • Unlimited Documents2 variants$9.991 Month
  • Remove Bookipi Branding$9.991 Month
Show 18 more
  • Unlimited Customers$9.991 Month
  • Full History Access$9.991 Month
  • Unlimited Documents$12.491 Month
  • Unlimited Documents Monthly$12.991 Month
  • Unlimited Documents Monthly1 Month trial$12.991 Month
  • Unlimited Documents$14.991 Month
  • Unlimited Documents$17.491 Month
  • Unlimited Documents$74.991 Year
  • Unlimited Documents$99.901 Year
  • Unlimited Customers$99.901 Year
  • Remove Bookipi Branding$99.901 Year
  • Full History Access$99.901 Year
  • Unlimited Documents$99.991 Year
  • Unlimited Documents$124.991 Year
  • Unlimited Documents Yearly2 variants$129.991 Year
  • Unlimited Documents Yearly1 Year trial$129.991 Year
  • Unlimited Documents$149.991 Year
  • Unlimited Documents$174.991 Year
None

Lock

No in-app purchases

Questions

Is Invoice Maker & Estimate App free?
Invoice Maker & Estimate App is free to download, with in-app purchases available.
Is Lock free?
Lock is free to download, with no in-app purchases.
Do Invoice Maker & Estimate App or Lock have ads?
Neither Invoice Maker & Estimate App nor Lock shows ads.

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