# Delta vs Posture Timer

The clearest difference is in-app purchases: Posture Timer at none against Delta's 3. Delta's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 15.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Delta sells 3 one-off in-app purchases. Posture Timer asks for nothing beyond the download.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 29, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Delta | Posture Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (7 ratings)](https://appshunter.io/ios/app/delta-algorithms/id1436506800/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Freemium | — |
| Size | 5 MB | 1 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Groupe MINASTE](https://appshunter.io/developer/1378426984) | [Chin Jui Kuo](https://appshunter.io/developer/1042103853) |

## What reviewers say

### Delta

[App page](https://appshunter.io/ios/app/delta-algorithms/id1436506800)

This app helps users solve math problems by creating and executing algorithms. It offers tools for homework checking, test preparation, and creating custom quizzes. Users can save, share, and download algorithms via the cloud.

**Highlights:** Create algorithms with natural language, Execute algorithms to solve math problems, Create and download custom quizzes, Save and share algorithms, Cloud synchronization for algorithms

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation 1 | $0.99 | one-time |
| Donation 2 | $2.99 | one-time |
| Donation 3 | $4.99 | one-time |


### Posture Timer

[App page](https://appshunter.io/ios/app/posture-timer-homework-helper/id6756823780)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Delta free?

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

### Is Posture Timer free?

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

### Do Delta or Posture Timer have ads?

Neither Delta nor Posture Timer shows ads.

### Which is updated more often, Delta or Posture Timer?

Delta ships an update monthly, and Posture Timer monthly. Most recently, Delta was updated on September 29, 2026 and Posture Timer on September 17, 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.*