# TARRAN vs River Ruler

The clearest difference is rating: TARRAN at 5.0 against River Ruler's 3.0. TARRAN also leads on in-app purchases (none vs 2) and iOS requirement (15.5 vs 17.0). River Ruler's advantage is update cadence (weekly vs every 6 weeks). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. River Ruler sells 2 one-off in-app purchases. TARRAN asks for nothing beyond the download.

TARRAN holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

TARRAN ships an update every 6 weeks, River Ruler weekly. The most recent releases landed on September 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | TARRAN | River Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tarran/id6553982054/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/river-ruler-length-and-map/id6793469300/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 132 MB | 14 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TARRAN](https://appshunter.io/developer/1758042435) | [Alex Pupko](https://appshunter.io/developer/1891763444) |

## What reviewers say

### TARRAN

[App page](https://appshunter.io/ios/app/tarran/id6553982054)

Manage your TARRAN bikes with this official companion app. Pair your device, control your bike remotely, track its live location, and receive security alerts with Sentry Mode.

**Highlights:** Device Pairing & Bike Management, Remote Lock/Unlock, Live GPS Tracking, Sentry Mode with Motion Detection, Security Alerts

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

**In-app purchases:** none


### River Ruler

[App page](https://appshunter.io/ios/app/river-ruler-length-and-map/id6793469300)

Measure river lengths precisely by following the actual riverbed, not a straight line. Get detailed trip data like flow, gradient, and estimated travel times for various watercraft and on foot. Export your measurements in multiple formats for GPS devices and mapping software.

**Highlights:** Measure river length along riverbed, View river source to mouth, Find rivers by name or coordinates, Analyze sinuosity, gradient, and discharge, Estimate travel time for kayak, SUP, or walking, Export measurements as GPX, KML, or PDF, Save measurement logs

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Unlock | $5.99 | one-time |
| RiverRuler lifetime | $9.99 | one-time |


## Frequently asked questions

### Is TARRAN free?

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

### Is River Ruler free?

River Ruler is free to download, with in-app purchases available.

### Which has better reviews, TARRAN or River Ruler?

TARRAN is rated higher. TARRAN averages 5.0 out of 5 from 1 ratings, while River Ruler averages 3.0 from 2 ratings.

### Do TARRAN or River Ruler have ads?

Neither TARRAN nor River Ruler shows ads.

### Which is updated more often, TARRAN or River Ruler?

TARRAN ships an update every 6 weeks, and River Ruler weekly. Most recently, TARRAN was updated on September 27, 2026 and River Ruler on October 25, 2026.

---

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