# Delta Calc vs Note by Xi

The clearest difference is in-app purchases: Note by Xi at none against Delta Calc's 3. Delta Calc's advantage is update cadence (every 3 days vs every 8 days). On price, ads, device support and iOS requirement there is nothing between them.

Delta Calc costs $0.99 and Note by Xi $0.99 up front. Delta Calc sells 3 in-app purchases, starting at $0.99 per month. Note by Xi asks for nothing beyond the download.

Delta Calc ships an update every 3 days, Note by Xi every 8 days. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Delta Calc | Note by Xi |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/delta-calc/id6504148868/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 8 days |
| Monetization | Paid | — |
| Size | 2 MB | 56 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Stephen Coffey](https://appshunter.io/developer/1723308273) | [鉴 郗](https://appshunter.io/developer/559961494) |

## 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, Vision Pro support

**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 |


### Note by Xi

[App page](https://appshunter.io/ios/app/note-by-xi-the-cleanest-note/id6757339447)

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

**In-app purchases:** none


## Frequently asked questions

### Is Delta Calc free?

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

### Is Note by Xi free?

Note by Xi costs $0.99, with no in-app purchases.

### Do Delta Calc or Note by Xi have ads?

Neither Delta Calc nor Note by Xi shows ads.

### Which is updated more often, Delta Calc or Note by Xi?

Delta Calc ships an update every 3 days, and Note by Xi every 8 days. Most recently, Delta Calc was updated on October 17, 2026 and Note by Xi on October 19, 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.*