# Zero? vs RiddleSum

The clearest difference is review sentiment: Zero? at 100% against RiddleSum's 0%. Zero? also leads on in-app purchases (none vs 1) and ads (none vs shown). RiddleSum's advantage is rating (4.6 vs 3.3) and update cadence (every 2 months vs every 3 months). On price and ratings volume there is nothing between them.

Both are free to download. RiddleSum sells 1 one-off in-app purchase. Zero? asks for nothing beyond the download.

RiddleSum holds the better App Store score, 4.6 against 3.3. Both are backed by a comparable volume of ratings — 4 and 10 respectively. Written reviews complicate that: 100% of Zero?'s written reviews are positive against 0% of RiddleSum's, so the app with the better star average is not the one people write more warmly about.

Zero? ships an update every 3 months, RiddleSum every 2 months. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Zero? | RiddleSum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (4 ratings)](https://appshunter.io/ios/app/zero/id1025506040/reviews) | **[4.6 (10 ratings)](https://appshunter.io/ios/app/riddlesum-math-puzzle/id6474078443/reviews)** |
| Number of ratings | 4 | **10** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 27 MB | 20 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Greg Sharpe](https://appshunter.io/developer/817544895) | [Dmitriy Romanov](https://appshunter.io/developer/689955162) |

## What reviewers say

### Zero?

[App page](https://appshunter.io/ios/app/zero/id1025506040)

A fast-paced number game where players must quickly determine if sums of numbers are multiples of ten. Offers various modes for solo play or head-to-head challenges with friends.

**Highlights:** Sum calculation challenges, Timed gameplay, Relaxed mode without time pressure, Two-player head-to-head mode, Multiplayer on a single device

**Features:** macOS Compatibility

**In-app purchases:** none


### RiddleSum

[App page](https://appshunter.io/ios/app/riddlesum-math-puzzle/id6474078443)

This number puzzle game challenges you to balance rows and columns by selecting the correct numbers. It offers a relaxing, clean design with hundreds of handcrafted puzzles to sharpen logic and mental math skills at your own pace.

**Highlights:** Hundreds of handcrafted puzzles, Clean and minimal design, Helpful hints, No timers, solve at your own pace, Daily brain workout, Logic and mental math training

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Zero? free?

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

### Is RiddleSum free?

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

### Which has better reviews, Zero? or RiddleSum?

RiddleSum is rated higher. Zero? averages 3.3 out of 5 from 4 ratings, while RiddleSum averages 4.6 from 10 ratings.

### Do Zero? or RiddleSum have ads?

RiddleSum shows ads; Zero? does not.

### Which is updated more often, Zero? or RiddleSum?

Zero? ships an update every 3 months, and RiddleSum every 2 months. Most recently, Zero? was updated on October 3, 2026 and RiddleSum on October 2, 2026.

---

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