# Delta vs Waterline

The clearest difference is in-app purchases: Waterline at none against Delta's 3. Delta's advantage is update cadence (monthly vs every 16 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Delta ships an update monthly, Waterline every 16 months. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Delta | Waterline |
| --- | --- | --- |
| 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** | Every 16 months |
| Monetization | Freemium | — |
| Size | 5 MB | 114 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Groupe MINASTE](https://appshunter.io/developer/1378426984) | [Games for Citizens](https://appshunter.io/developer/1573438126) |

## 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 |


### Waterline

[App page](https://appshunter.io/ios/app/waterline/id6446896688)

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

**In-app purchases:** none


## Frequently asked questions

### Is Delta free?

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

### Is Waterline free?

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

### Do Delta or Waterline have ads?

Neither Delta nor Waterline shows ads.

### Which is updated more often, Delta or Waterline?

Delta ships an update monthly, and Waterline every 16 months. Most recently, Delta was updated on October 14, 2026 and Waterline on October 5, 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.*