# Modular Arithmetic vs Water

The clearest difference is update cadence: Water at fortnightly against Modular Arithmetic's every 12 months. Modular Arithmetic's advantage is price ($1.99 vs $2.99) and iOS requirement (12.0 vs 15.5). On ads, in-app purchases and device support there is nothing between them.

Modular Arithmetic costs $1.99 and Water $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Modular Arithmetic ships an update every 12 months, Water fortnightly. The most recent releases landed on September 17, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Modular Arithmetic | Water |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/modular-arithmetic/id687735575/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 2 MB | 1 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Benjamin Burton](https://appshunter.io/developer/687735578) | [Konstantinos Ladiellis](https://appshunter.io/developer/1516103440) |

## What reviewers say

### Modular Arithmetic

[App page](https://appshunter.io/ios/app/modular-arithmetic/id687735575)

Perform calculations with remainders using a chosen modulus. Supports large numbers, fast modular division and exponentiation, and displays a full calculation transcript. Ideal for understanding modular arithmetic's applications in math and computer science.

**Highlights:** Fixed modulus selection, Arbitrarily large numbers, Fast modular division and exponentiation, Full calculation transcript, Order of operations convention, External keyboard and Siri Shortcuts support

**Features:** Vision Pro support

**In-app purchases:** none


### Water

[App page](https://appshunter.io/ios/app/water-steam-properties/id1640984269)

**In-app purchases:** none


## Frequently asked questions

### Is Modular Arithmetic free?

Modular Arithmetic costs $1.99, with no in-app purchases.

### Is Water free?

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

### Do Modular Arithmetic or Water have ads?

Neither Modular Arithmetic nor Water shows ads.

### Which is updated more often, Modular Arithmetic or Water?

Modular Arithmetic ships an update every 12 months, and Water fortnightly. Most recently, Modular Arithmetic was updated on September 17, 2026 and Water on September 10, 2026.

---

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