# Linear System Solver vs AI Essay Writer

The clearest difference is price: AI Essay Writer at Free against Linear System Solver's $0.99. Linear System Solver's advantage is in-app purchases (none vs 12) and update cadence (every 3 days vs every 3 weeks). On ads, device support and iOS requirement there is nothing between them.

AI Essay Writer is free to download; Linear System Solver costs $0.99 up front. AI Essay Writer sells 12 in-app purchases, starting at $6.99 per 7 days. Linear System Solver asks for nothing beyond the download.

Linear System Solver ships an update every 3 days, AI Essay Writer every 3 weeks. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Linear System Solver | AI Essay Writer |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.8 (752 ratings)](https://appshunter.io/ios/app/ai-essay-writer-parawriter/id6471593416/reviews)** |
| Number of ratings | — | **752** |
| Positive reviews | — | 61.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 130 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Luigi Fonti](https://appshunter.io/developer/360904185) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## What reviewers say

### Linear System Solver

[App page](https://appshunter.io/ios/app/linear-system-solver/id6469396751)

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

**In-app purchases:** none


### AI Essay Writer

[App page](https://appshunter.io/ios/app/ai-essay-writer-parawriter/id6471593416)

This app assists users in writing, paraphrasing, and generating various types of content. It offers tools for essay generation, text rewriting, paragraph creation, summarization, and grammar correction, making writing faster and smarter for students and professionals alike.

**Highlights:** AI Essay Writer, Paraphrase Text, Paragraph Generator, Summarization Tool, Grammar Correction, AI Story Generator

**Features:** macOS Compatibility

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $6.99 | per 7 days |
| Weekly Pro | $6.99 | per 7 days |
| Unlimited Access | $7.99 | per 7 days |
| Weekly Premium | $7.99 | per 7 days |
| Unlimited Access | $8.99 | per 7 days |
| Monthly Pro | $9.99 | per month |
| Monthly Pro | $9.99 | per month |
| Yearly Pro Discounted | $29.99 | per year |
| Yearly Pro | $39.99 | per year |
| Yearly Pro | $39.99 | per year |
| Unlimited Access | $49.99 | per year |
| Yearly Premium | $49.99 | per year |

**What reviewers like**

- 🚀 Excellent paraphrasing capabilities
- 👍 Helpful for writing essays and papers
- 🚀 Efficient and time-saving
- 👍 Beneficial for improving writing skills

**What reviewers complain about**

- 🐛 Occasional issues with functionality
- 🔒 Concerns about subscription renewals
- 🔒 Lack of syncing between devices

**Reported bugs**

- Doesn't work all the time even with subscription
- Error summarizing long texts
- Cuts off towards the end

**Requested features**

- Add gift to a friend feature
- More 3D design options
- Renew and update chatbots
- Desktop version that connects with phone
- Option to choose writing language beforehand


## Frequently asked questions

### Is Linear System Solver free?

Linear System Solver costs $0.99, with no in-app purchases.

### Is AI Essay Writer free?

AI Essay Writer is free to download, with in-app purchases available.

### Do Linear System Solver or AI Essay Writer have ads?

Neither Linear System Solver nor AI Essay Writer shows ads.

### Which is updated more often, Linear System Solver or AI Essay Writer?

Linear System Solver ships an update every 3 days, and AI Essay Writer every 3 weeks. Most recently, Linear System Solver was updated on October 12, 2026 and AI Essay Writer on October 6, 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.*