# Delta Calc vs Chartes

The clearest difference is price: Chartes at Free against Delta Calc's $0.99. Chartes also leads on iOS requirement (15.1 vs 17.6). Delta Calc's advantage is update cadence (every 3 days vs every 6 weeks). On ads, in-app purchases and device support there is nothing between them.

Chartes 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 Chartes sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Delta Calc ships an update every 3 days, Chartes every 6 weeks. The most recent releases landed on June 1, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Delta Calc | Chartes |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/delta-calc/id6504148868/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 6 weeks |
| Monetization | Paid | — |
| Size | 2 MB | 50 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stephen Coffey](https://appshunter.io/developer/1723308273) | [Aiofeffect LLC](https://appshunter.io/developer/1833105894) |

## 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 |


### Chartes

[App page](https://appshunter.io/ios/app/chartes/id6756995293)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chartes Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is Delta Calc free?

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

### Is Chartes free?

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

### Do Delta Calc or Chartes have ads?

Neither Delta Calc nor Chartes shows ads.

### Which is updated more often, Delta Calc or Chartes?

Delta Calc ships an update every 3 days, and Chartes every 6 weeks. Most recently, Delta Calc was updated on June 1, 2026 and Chartes on September 15, 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.*