# testo Smart vs Invoice Maker

The clearest difference is rating: Invoice Maker at 5.0 against testo Smart's 2.7. Invoice Maker also leads on update cadence (monthly vs every 2 months) and iOS requirement (15.0 vs 18.0). testo Smart's advantage is ads (none vs shown) and ratings volume (167 vs 5). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. testo Smart sells 5 in-app purchases, starting at $6.99 per month and Invoice Maker sells 2 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Invoice Maker holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 167 ratings behind it against 5, so its average is the more settled of the two.

testo Smart ships an update every 2 months, Invoice Maker monthly. The most recent releases landed on October 13, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | testo Smart | Invoice Maker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (167 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/invoice-maker-invoflow/id6756097909/reviews)** |
| Number of ratings | **167** | 5 |
| Positive reviews | 16.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 195 MB | 51 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [Pixoo LLC](https://appshunter.io/developer/1839405939) |

## What reviewers say

### testo Smart

[App page](https://appshunter.io/ios/app/testo-smart/id1482139629)

This app supports measurements for refrigeration, HVAC, and heating systems. It also aids in food safety, frying oil quality, and indoor climate monitoring. Quickly interpret data, create digital reports with photos, and send them via email.

**Highlights:** All-in-one system measurements, Graphical display of measured values, Digital PDF/CSV measurement reports, Email report sharing, Leak test analysis, Automatic refrigerant charging, Indoor air quality monitoring

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Multi-site measurement | $6.99 | per month |
| Air balancing | $9.99 | per month |
| Multi-site measurement | $69.90 | per year |
| Air balancing | $99.90 | per year |
| Logging digital manifold | $44.99 | one-time |

**What reviewers like**

- 👍 Good app with some features
- 🚀 Great product
- 🚀 Useful app for measurements

**What reviewers complain about**

- 🐛 App won't connect
- 🐛 Connectivity issues
- 🐛 Unreliable connection
- 🐛 Forced updates
- 🐛 Laggy and unresponsive UI

**Reported bugs**

- App won't connect to devices
- Compatibility issues with newer iOS versions
- Frequent crashes and freezes
- Inability to save favorite refrigerants
- Measurement data not displaying properly

**Requested features**

- Add option to toggle Bluetooth discovery
- Improve Bluetooth range
- Add ability to customize colors and graphs
- Improve data export functionality
- Add option to name sensors


### Invoice Maker

[App page](https://appshunter.io/ios/app/invoice-maker-invoflow/id6756097909)

Create and send professional invoices quickly and easily. Save client and service details for faster billing, track payments, and export polished PDF invoices. Ideal for freelancers and small businesses needing efficient invoicing.

**Highlights:** Fast invoice creation (under 30 seconds), Smart templates for clients and services, PDF export for sharing, Multi-currency support, Payment tracking dashboard, Offline access

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Invoice Maker - Weekly | $7.99 | per 7 days |
| Invoice Maker - Yearly | $39.99 | per year |


## Frequently asked questions

### Is testo Smart free?

testo Smart is free to download, with in-app purchases available.

### Is Invoice Maker free?

Invoice Maker is free to download, with in-app purchases available.

### Which has better reviews, testo Smart or Invoice Maker?

Invoice Maker is rated higher. testo Smart averages 2.7 out of 5 from 167 ratings, while Invoice Maker averages 5.0 from 5 ratings.

### Do testo Smart or Invoice Maker have ads?

Invoice Maker shows ads; testo Smart does not.

### Which is updated more often, testo Smart or Invoice Maker?

testo Smart ships an update every 2 months, and Invoice Maker monthly. Most recently, testo Smart was updated on October 13, 2026 and Invoice Maker on September 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*