BookNapper vs XGas
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BookNapper
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Singapore National Library Board (NLB) Book Availability Search. Keep a list of books to read by scanning in their ISBN bar code numbers. The app will tell you where each book can be found in the NLB branch library system. Also, when you walk into an NLB branch library, the app will tell you which of the books in your to-read list can be found there, together with their call numbers, so you can quickly locate the book.
XGas
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It is an app that allows you to view gas information, temperature, humidity, and air pressure by connecting to the XMG100 gas device through Bluetooth. You can view the data by graphing the stored data on the calendar screen. You can change the alarm ON/OFF, sound, and vibration on the settings screen.
Screenshots
Verdict
The clearest difference is iOS requirement: XGas at 13.0 against BookNapper's 16.0. On price, update cadence, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BookNapper ships an update every 2 weeks, XGas every 3 weeks. Both last shipped on October 3, 2026.
| Parameter | BookNapper | XGas |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 22 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Cutedge | Chois Technology |
In-app purchases
BookNapper
No in-app purchases
XGas
No in-app purchases
