# Rinnai Central vs SlangDecoder

The clearest difference is price: Rinnai Central at Free against SlangDecoder's $2.99. Rinnai Central also leads on iOS requirement (15.4.1 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Rinnai Central is free to download; SlangDecoder costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rinnai Central ships an update monthly, SlangDecoder every 2 months. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Rinnai Central | SlangDecoder |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[1.6 (341 ratings)](https://appshunter.io/ios/app/rinnai-central/id6444321202/reviews)** | — |
| Number of ratings | **341** | — |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free | — |
| Size | 79 MB | 4 MB |
| Requires iOS | **15.4.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rinnai America Corp](https://appshunter.io/developer/1045235922) | [Greg Anderson](https://appshunter.io/developer/345127565) |

## What reviewers say

### Rinnai Central

[App page](https://appshunter.io/ios/app/rinnai-central/id6444321202)

This app connects Rinnai tankless water heater owners to their devices for temperature control and scheduling. Professional installers can use it to register appliances, perform service, access documentation, and order parts.

**Highlights:** Adjust water temperature, Schedule hot water, Activate recirculation, Register appliances, Perform remote service, Access documentation, Order replacement parts

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Works great
- 🚀 Much improved
- 🚀 Fantastic
- 🚀 Working perfectly now

**What reviewers complain about**

- 🐛 Doesn't work at all
- 🐛 Bug in 4.3.0
- 🐛 Awful. Just terrible
- 🐛 Lousy App
- 🐛 Rinnai does not care

**Reported bugs**

- Control failed is still happening in latest version
- Login screen freezes
- Incompatible with older devices

**Requested features**

- Add device through Bluetooth missing
- Dark mode option
- Advanced analytics dashboard


### SlangDecoder

[App page](https://appshunter.io/ios/app/slangdecoder/id6761937094)

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

**In-app purchases:** none


## Frequently asked questions

### Is Rinnai Central free?

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

### Is SlangDecoder free?

SlangDecoder costs $2.99, with no in-app purchases.

### Do Rinnai Central or SlangDecoder have ads?

Neither Rinnai Central nor SlangDecoder shows ads.

### Which is updated more often, Rinnai Central or SlangDecoder?

Rinnai Central ships an update monthly, and SlangDecoder every 2 months. Most recently, Rinnai Central was updated on October 14, 2026 and SlangDecoder on October 13, 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.*