# River Ruler: Length & Map — Kayak, hiking & world rivers

> Measures river lengths and provides detailed hydrological and travel data. (iPhone/iPad app by Alex Pupko.)

- Source: https://appshunter.io/ios/app/river-ruler-length-and-map/id6793469300 (this page in markdown: same URL + `.md`)
- Developer: [Alex Pupko](https://appshunter.io/developer/1891763444)
- Category: Travel
- Price: Free with in-app purchases
- Rating: 3.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 14 MB
- Languages: German (Germany), Arabic, Danish, American English, Finnish, French (France), Italian, Japanese, Korean, Dutch and 10 more
- Released: 2026-07-29
- Data updated: 2026-09-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/river-ruler-length-and-map/id6793469300/reviews.md

## What is River Ruler?

How long is that stretch of river you are about to paddle? Drop two pins and River Ruler measures the riverbed itself, following every bend instead of drawing a straight line.
You also get the numbers that decide a trip: where the river starts and ends, how much water it carries, how steep it runs, how winding it is, and how long the section takes by kayak, SUP or on foot.
• Measure any river section — along the real riverbed, not a straight line
• See the whole river, from source to mouth, with its total length
• Find rivers by name, or jump straight to coordinates
• Sinuosity, gradient, elevation drop, discharge, basin area, flow direction
• Travel time for kayak, SUP or walking
• Export as GPX for your GPS, KML for Google Earth, PDF or a ready-to-send image
• Saved log of your measurements
• Light and dark map styles
Built on open OpenStreetMap data. No account, no sign-up, no ads.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://docs.google.com/document/d/1yTks6ZXW39TOUheZfEf96e-T1cFWzF1eWik8Ax-9HAo/edit?tab=t.0

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RiverRuler lifetime | $4.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/river-ruler-length-and-map/id6793469300/reviews.md

### 5/5 — Pretty nice!

*2026-08-29*

very simple and useful app

**Developer response:** Thanks for your feedback!

### 1/5 — Не работает

*2026-08-18*

Заплатил, но мерить маршрут приложение не хочет, долго крутит загрузку и в итоге на мой плохой интернет ссылается. Чушь.

**Developer response:** Hi! Thanks for the honest feedback. We're a young app and we keep making it better with every update. In version 1.2 measuring is noticeably more reliable: if the map server is slow, the app now retries automatically through another server, already-loaded data isn't re-downloaded, and wide rivers like the Mississippi need far fewer requests. You can get a refund anytime via Apple: reportaproblem.apple.com → "Request a refund". And after the refund, email us at tenkapp@proton.me — we'll gladly gift you a promo code so you can try 1.2 for free.

Здравствуйте! Спасибо за честный отзыв. Мы только начинаем развивать сервис и с каждым обновлением стараемся делать его лучше. В версии 1.2 замер стал заметно надёжнее: если сервер карт отвечает медленно, приложение само повторяет запрос через другой сервер, уже загруженное не качается заново, а широким рекам вроде Миссисипи нужно куда меньше запросов. Возврат можно оформить через Apple: reportaproblem.apple.com → «Запросить возврат». А после возврата напишите нам на tenkapp@proton.me — с радостью подарим промокод, чтобы попробовать 1.2 бесплатно.

## Frequently asked questions about River Ruler

### How does River Ruler measure river length?

River Ruler measures river length by precisely following the actual riverbed, accounting for every bend and curve, rather than drawing a straight line between two points. This provides a more accurate measurement for your paddling or hiking trips.

### What kind of data does River Ruler provide about a river section?

River Ruler provides comprehensive data including sinuosity, gradient, elevation drop, discharge, basin area, flow direction, and estimated travel time for kayak, SUP, or walking. This helps users understand the river's characteristics and plan their journey.

### Can I use River Ruler measurements with my GPS device?

Yes, River Ruler allows you to export your measurements in GPX format, which is compatible with most GPS devices. You can also export as KML for Google Earth, PDF, or a ready-to-send image.

### Does River Ruler require an account or sign-up?

No, River Ruler does not require an account or sign-up to use its features. You can start measuring rivers immediately after downloading the app.

### Does River Ruler have ads?

No, River Ruler is ad-free. The app explicitly states 'no ads' in its description, ensuring an uninterrupted user experience.

### What platforms is River Ruler available on?

River Ruler is available on iPhone and iPad, as indicated by the supported devices list. It is designed for Apple's mobile operating systems.

### How often is River Ruler updated?

The latest version of River Ruler is 1.2, which was last updated on August 21, 2026. This indicates a recent update, suggesting ongoing development and support for the application.

### What is the age rating for River Ruler?

River Ruler has an age rating of 4+. This means it is suitable for users aged 4 and above, making it accessible for a wide range of younger and older users interested in its features.

## Version history (last 5 releases)

### 1.4 — 2026-09-02

New
• The app now speaks eight more languages: Swedish, Danish, Finnish, Norwegian, Dutch, Polish, Czech and Traditional Chinese.

Improved
• Pins snap to the river. You no longer have to hit a narrow channel exactly with your finger.
• Wide rivers measure from the bank — the app widens its search until it finds the channel instead of saying there is no river nearby.
• The map recovers on its own after a network hiccup. Before, it stayed grey until you restarted the app.

Fixed
• Taking the free measurements offered on the purchase screen now continues your measurement. Your two points stay where you put them.

### 1.3 — 2026-08-28

Improved
• Wide rivers now measure from the bank. Put a pin on the shore of the Severn or the Danube and the app widens its search until it finds the channel, instead of telling you there is no river there.
• Only the pin that missed is looked up again, so a measurement finishes sooner and runs into the timeout far less often.

Fixed
• Small corrections on the purchase and settings screens.

### 1.2 — 2026-08-21

New
• What's along the section: rapids, slipways and campsites. Loaded with a tap, and every point gets a card with coordinates you can copy.
• Whole rivers now save to your history alongside measurements.
• Quick map ↔ satellite switch: the thumbnail shows this exact place.

Fixed
• Whole-river length came out too high where the channel is duplicated in the data. Source and mouth now sit at the river's ends, not in the middle.
• Switching the base map no longer moves the map to your location.
• When a river isn't found you can see it, and the search can be retried.
• River highlighting no longer reloads places you've already viewed.

### 1.1 — 2026-08-14

bug fixes, new features

### 1.0 — 2026-07-29

No release notes.

## More apps by Alex Pupko

- [tenk: Step Counter & Tracker](https://appshunter.io/ios/app/tenk-step-counter-and-tracker/id6761849536)
- [Subvibe: Subtitle Editor SRT](https://appshunter.io/ios/app/subvibe-subtitle-editor-srt/id6786253524)

All apps by Alex Pupko: https://appshunter.io/developer/1891763444

## Related topics

[my sky river](https://appshunter.io/ios/topics/my-sky-river) · [dungeness river flow monitor](https://appshunter.io/ios/topics/dungeness-river-flow-monitor) · [river maps](https://appshunter.io/ios/topics/river-maps) · [river map](https://appshunter.io/ios/topics/river-map) · [gosup](https://appshunter.io/ios/topics/gosup) · [river mapp](https://appshunter.io/ios/topics/river-mapp) · [blue liner flows](https://appshunter.io/ios/topics/blue-liner-flows)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-11.*