# Delta Calc vs Memory Roulette

The clearest difference is price: Memory Roulette at Free against Delta Calc's $0.99. Memory Roulette also leads on iOS requirement (14.0 vs 17.6). On rating, ratings volume, update cadence and ads there is nothing between them.

Memory Roulette is free to download; Delta Calc costs $0.99 up front. Delta Calc sells 3 in-app purchases, starting at $0.99 per month and Memory Roulette sells 3 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Delta Calc against 5.0 for Memory Roulette. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Delta Calc ships an update every 3 days, Memory Roulette every 4 days. The most recent releases landed on June 1, 2026 and August 14, 2026 respectively.

## The numbers

| Metric | Delta Calc | Memory Roulette |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/delta-calc/id6504148868/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/memory-roulette/id6755274912/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 37 MB |
| Requires iOS | 17.6 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stephen Coffey](https://appshunter.io/developer/1723308273) | [志文 李](https://appshunter.io/developer/1852909959) |

## What reviewers say

### Delta Calc

[App page](https://appshunter.io/ios/app/delta-calc/id6504148868)

Quickly calculate percent changes, discounts, and financial gains without complex math. Solve for any of the three values in the percent change formula with an intuitive interface and fun animations.

**Highlights:** Calculate percent changes, Solve for any variable in the formula, Customizable decimal places, Haptic feedback, Fun animations, Adjustable keyboard buttons

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Delta Calc Monthly | $0.99 | per month |
| Delta Calc Yearly | $4.99 | per year |
| Delta Calc Lifetime | $9.99 | one-time |


### Memory Roulette

[App page](https://appshunter.io/ios/app/memory-roulette/id6755274912)

Transform your cluttered camera roll into a curated collection of cherished memories. This app gamifies photo organization, offering daily surprise selections for quick review and decluttering. Rediscover forgotten moments and enjoy a cleaner, more meaningful photo library.

**Highlights:** Daily surprise photo crates, 3-second swipe review (Favorite, Share, Delete), Gamified photo decluttering, Unlimited draws with premium, Customizable roulette filters (year, location, type), Rediscover forgotten memories

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $5.99 | per month |
| Yearly Subscription | $49.99 | per year |
| lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Delta Calc free?

Delta Calc costs $0.99, and also offers in-app purchases.

### Is Memory Roulette free?

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

### Which has better reviews, Delta Calc or Memory Roulette?

Delta Calc and Memory Roulette are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Delta Calc or Memory Roulette have ads?

Neither Delta Calc nor Memory Roulette shows ads.

### Which is updated more often, Delta Calc or Memory Roulette?

Delta Calc ships an update every 3 days, and Memory Roulette every 4 days. Most recently, Delta Calc was updated on June 1, 2026 and Memory Roulette on August 14, 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.*