# dnCalc vs Sliding Puzzle

The clearest difference is price: dnCalc at Free against Sliding Puzzle's $1.99. dnCalc also leads on ads (none vs shown) and update cadence (fortnightly vs every 7 months). On in-app purchases and device support there is nothing between them.

dnCalc is free to download; Sliding Puzzle costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

dnCalc ships an update fortnightly, Sliding Puzzle every 7 months. The most recent releases landed on October 13, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | dnCalc | Sliding Puzzle |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 7 months |
| Monetization | Free | — |
| Size | 15 MB | 91 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Devious-Monkey](https://appshunter.io/developer/388388527) | [Oscar Tsang](https://appshunter.io/developer/416987065) |

## What reviewers say

### dnCalc

[App page](https://appshunter.io/ios/app/dncalc/id1309683648)

Perform amazing mathematical "experiences" to impress friends and colleagues. This app allows you to reveal secret numbers, ages, zodiac signs, and more, all without touching a calculator. It's easy to use, requires no memorization, and can be done with your eyes closed.

**Highlights:** Reveal secret numbers, Peek at ages and zodiac signs, Calculate birth day of week, Create custom formulas, Works offline, Up to 5 participants

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

**In-app purchases:** none


### Sliding Puzzle

[App page](https://appshunter.io/ios/app/sliding-puzzle-lets-think/id6760445675)

**In-app purchases:** none


## Frequently asked questions

### Is dnCalc free?

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

### Is Sliding Puzzle free?

Sliding Puzzle costs $1.99, with no in-app purchases.

### Do dnCalc or Sliding Puzzle have ads?

Sliding Puzzle shows ads; dnCalc does not.

### Which is updated more often, dnCalc or Sliding Puzzle?

dnCalc ships an update fortnightly, and Sliding Puzzle every 7 months. Most recently, dnCalc was updated on October 13, 2026 and Sliding Puzzle on October 31, 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.*