# Gas Engineer Software vs Viessmann Warranty

The clearest difference is in-app purchases: Viessmann Warranty at none against Gas Engineer Software's 1. Viessmann Warranty also leads on iOS requirement (13.0 vs 15.0). Gas Engineer Software's advantage is update cadence (weekly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Gas Engineer Software sells 1 one-off in-app purchase. Viessmann Warranty asks for nothing beyond the download.

Gas Engineer Software ships an update weekly, Viessmann Warranty every 3 months. The most recent releases landed on October 29, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Gas Engineer Software | Viessmann Warranty |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 84.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 194 MB | 16 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Software Works for You Ltd](https://appshunter.io/developer/771853288) | [RK Marketing Ltd](https://appshunter.io/developer/956856410) |

## What reviewers say

### Gas Engineer Software

[App page](https://appshunter.io/ios/app/gas-engineer-software-ges/id771853285)

This comprehensive app helps gas, oil, and plumbing professionals streamline their business operations. It allows for the creation of industry-specific certificates, issuance of quotes and invoices, and efficient job scheduling. Manage your team, customers, and finances from any device, anywhere, saving time and boosting revenue.

**Highlights:** Create industry certificates, Issue quotes and invoices, Schedule jobs with calendar, Manage team and customers, Automated service reminders, Offline access

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Single Engineer - 12 Months Subscription | $19.00 | one-time |

**What reviewers like**

- 👍 Easy to use
- ⏱️ Time saver
- 💼 Professional appearance
- 📈 Scales with business growth
- 🛠️ Reliable day-to-day

**What reviewers complain about**

- 💰 Price keeps increasing
- 📉 No real improvement seen
- 😠 Greed perceived
- ⚠️ Unexpected maintenance
- ✍️ Small font size

**Reported bugs**

- Unexpected site shutdowns
- Syncing is slow
- Glitches in invoicing following a job report
- App has become very slow due to latest update
- Not usable at present time

**Requested features**

- Add multiple picture attachments
- Select several photos at once
- Flag jobs as finished
- Oil forms for non-OFTEC registered companies
- Calculate pipe work volume and purge volume


### Viessmann Warranty

[App page](https://appshunter.io/ios/app/viessmann-warranty/id1387870221)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gas Engineer Software free?

Gas Engineer Software is free to download, with in-app purchases available.

### Is Viessmann Warranty free?

Viessmann Warranty is free to download, with no in-app purchases.

### Do Gas Engineer Software or Viessmann Warranty have ads?

Neither Gas Engineer Software nor Viessmann Warranty shows ads.

### Which is updated more often, Gas Engineer Software or Viessmann Warranty?

Gas Engineer Software ships an update weekly, and Viessmann Warranty every 3 months. Most recently, Gas Engineer Software was updated on October 29, 2026 and Viessmann Warranty on October 26, 2026.

---

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