# GNSS Circuit Logger vs QUAD

The clearest difference is ads: QUAD at none against GNSS Circuit Logger's shown. QUAD also leads on review sentiment (100% vs 78%). GNSS Circuit Logger's advantage is monetization model (ad-supported vs free with in-app purchases) and iOS requirement (10.3 vs 15.1). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GNSS Circuit Logger ships an update every 11 days, QUAD every 2 weeks. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | GNSS Circuit Logger | QUAD |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 77.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 11 days** | Every 2 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 14 MB | 49 MB |
| Requires iOS | **10.3** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yuji Kanda](https://appshunter.io/developer/1244419770) | [SYNSETECH LTD](https://appshunter.io/developer/6792617372) |

## What reviewers say

### GNSS Circuit Logger

[App page](https://appshunter.io/ios/app/gnss-circuit-logger/id1435155551)

This application functions as a lap timer for circuit driving, utilizing GNSS technology. It supports various BLE devices for data logging and offers CSV, NMEA, and GPX output formats for lap times.

**Highlights:** GNSS lap timer for circuit driving, BLE device compatibility (LNS and QSTARZ protocols), CSV, NMEA, GPX lap time output, Data logging for circuit racing

**Features:** macOS Compatibility

**In-app purchases:** none


### QUAD

[App page](https://appshunter.io/ios/app/quad-g-forcemeter-laptimer/id6792617370)

This app uses your phone's sensors and GPS to provide real-time lap timing, sector splits, and vehicle dynamics data like G-forces and four-wheel weight transfer. It also includes a data logger for post-drive analysis and alerts for understeer and oversteer.

**Highlights:** GPS lap and sector timing, Four-wheel load monitoring, Real-time G-G diagram, Understeer/oversteer alerts, Data logging and playback, Customizable UI themes and units

**In-app purchases:** none


## Frequently asked questions

### Is GNSS Circuit Logger free?

GNSS Circuit Logger is free to download, with no in-app purchases.

### Is QUAD free?

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

### Do GNSS Circuit Logger or QUAD have ads?

GNSS Circuit Logger shows ads; QUAD does not.

### Which is updated more often, GNSS Circuit Logger or QUAD?

GNSS Circuit Logger ships an update every 11 days, and QUAD every 2 weeks. Most recently, GNSS Circuit Logger was updated on November 2, 2026 and QUAD on November 5, 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.*