Comparison

Invoice Maker vs HeatSig

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

Head to head
About

Invoice Maker

Create professional invoices, estimates, and receipts quickly. Customize templates with your logo, add taxes, and track payment status. Ideal for freelancers and small businesses needing efficient billing.

Highlights
  • Professional invoice creation
  • Customizable templates with logo
  • Automatic tax and total calculations
  • PDF export and instant sharing
  • Client and product management
  • Invoice status tracking
  • Multiple currency and tax support
Features
Read full description

Create professional invoices, estimates/quotes, and receipts in minutes with Invoice Maker App — a simple invoice generator and invoice creator for freelancers, contractors, and small businesses. Customize invoice templates, add your logo and signature, apply taxes, and export a PDF invoice you can email or share instantly. Designed for fast, accurate invoicing and billing, the app lets you itemize services and products, set rates and quantities, add VAT/GST/sales tax, and see totals with automatic calculations. Keep your client invoicing organized, track invoice status (draft/sent/paid), and stay professional with consistent business invoice formatting. Key Features: - Simple invoice app & intuitive interface – start creating invoices with no learning curve. - Invoice & estimate templates – multiple layouts for invoices, estimates, and quotes. - Automatic tax & total calculations – itemized lines, rates, discounts, and accurate subtotals. - Logo, signature & company details – brand every professional invoice you send. - PDF invoice & receipt generator – export, print, or share as PDF in one tap. - Manage clients & products – save items, services, and customer details for faster billing. - Track invoices & payments – see when an invoice is sent, viewed, or marked paid. - Multiple currencies & tax systems – supports VAT, GST, and regional tax options. - Send invoices instantly – email invoices and estimates, or share via link and messenger. Made for Freelancers, contractors, self-employed professionals, service providers, trades, consultants, and small business owners who need a reliable invoice maker app, invoice generator app, estimate maker, and quote maker—all in one place. Start creating invoices today — fast, simple, and professional. Build consistent billing & invoicing workflows, maintain clear invoice PDF records, and get paid with polished business invoices every time. Privacy Policy: https://telegra.ph/Privacy-Policy-11-22-24 Terms of Service: https://telegra.ph/Terms-of-Use-11-22

About

HeatSig

Features
Read full description

HeatSig is your IoT-powered companion for monitoring heat signatures with precision. Connect to your thermal devices, stream real-time data, and visualize temperature changes in an intuitive dashboard. Whether you’re tracking equipment, monitoring environments, or running experiments, HeatSig helps you stay informed and in control. Features: • Real-time heat signature monitoring via IoT sensors • Secure MQTT/HTTP connectivity • Clear visual dashboards for temperature and heat maps • Works across networks — local and cloud • Dark/Light theme support Ideal for: • Industrial monitoring • Environmental tracking • Smart labs & research projects • IoT enthusiasts Stay connected to the heat — with HeatSig.

Screenshots

Invoice Maker4 screens
HeatSig4 screens

Verdict

The call

The clearest difference is in-app purchases: HeatSig at none against Invoice Maker's 6. HeatSig also leads on ads (none vs shown) and device support (3 vs 1). On price, update cadence 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 sells 6 in-app purchases, starting at $4.99 per 7 days. HeatSig asks for nothing beyond the download.

UpkeepUpdate frequency

Invoice Maker ships an update fortnightly, HeatSig every 3 weeks. The most recent releases landed on October 15, 2026 and October 12, 2026 respectively.

Scorecard3 real differences · 7 level
Invoice Maker versus HeatSig: the parameters behind the verdict, then further details
ParameterInvoice MakerHeatSig
PriceFreeFree
Rating5.0 (17 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings17 — better—
Update frequencyFortnightly — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.415.1 — better
Further details — not scored
Size33 MB66 MB
Age rating4+4+
DeveloperMyAppsHeatsig Pte. Ltd.

In-app purchases

6 purchases

Invoice Maker

Subscriptions6
  • Invoice Maker3 Days trial$4.997 Days
  • Invoices$4.997 Days
  • Invoice Generator$9.991 Month
Show 3 more
  • Invoice App3 Days trial$9.991 Month
  • Invoice Simple3 Days trial$39.991 Year
  • Make Receipt$39.991 Year
None

HeatSig

No in-app purchases

Questions

Is Invoice Maker free?
Invoice Maker is free to download, with in-app purchases available.
Is HeatSig free?
HeatSig is free to download, with no in-app purchases.
Do Invoice Maker or HeatSig have ads?
Invoice Maker shows ads; HeatSig does not.
Which is updated more often, Invoice Maker or HeatSig?
Invoice Maker ships an update fortnightly, and HeatSig every 3 weeks. Most recently, Invoice Maker was updated on October 15, 2026 and HeatSig on October 12, 2026.

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