# Soulver 4 vs Nitro PDF Pro

The clearest difference is review sentiment: Soulver 4 at 76% against Nitro PDF Pro's 12%. Soulver 4 also leads on rating (4.9 vs 3.9) and update cadence (monthly vs every 2 months). Nitro PDF Pro's advantage is monetization model (free with in-app purchases vs paid). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Soulver 4 sells 10 in-app purchases, starting at $26.00 per year and Nitro PDF Pro sells 2 in-app purchases, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.

Soulver 4 holds the better App Store score, 4.9 against 3.9. Both are backed by a comparable volume of ratings — 436 and 161 respectively. Written reviews point the same way: 76% of Soulver 4's written reviews are positive against 12% of Nitro PDF Pro's.

Soulver 4 ships an update monthly, Nitro PDF Pro every 2 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Soulver 4 | Nitro PDF Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (436 ratings)](https://appshunter.io/ios/app/soulver-4/id1508732804/reviews)** | [3.9 (161 ratings)](https://appshunter.io/ios/app/nitro-pdf-pro-read-and-edit/id1608616539/reviews) |
| Number of ratings | **436** | 161 |
| Positive reviews | **76.0% of reviews** | 12.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 40 MB | 63 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Zac Cohan](https://appshunter.io/developer/1508732803) | [Nitro Software, Inc.](https://appshunter.io/developer/1607870122) |

## What reviewers say

### Soulver 4

[App page](https://appshunter.io/ios/app/soulver-4/id1508732804)

This app combines the functionality of a notepad with a powerful calculator. It allows users to perform complex calculations using natural language, supports unit conversions, date math, and live currency conversions. Organize your calculations in sheets with text comments and share them as PDFs.

**Highlights:** Natural language calculations, Unit and currency conversions, Date and time math, Live currency and stock prices, Customizable accessory keyboards, Spreadsheet-like line references, Variables and conditional statements

**Features:** Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Assistant, Stocks & Weather | $26.00 | per year |
| 60-day free trial (for iPad) | Free | one-time |
| 60-day free trial (for Mac) | Free | one-time |
| Soulver 3 for iPhone | $14.00 | one-time |
| Soulver 4 for iPhone | $15.00 | one-time |
| Soulver 3 for iPad | $20.00 | one-time |
| Soulver 4 (Upgrade from Soulver 3) | $29.00 | one-time |
| Soulver 3 for Mac | $39.00 | one-time |
| Soulver 4 | $54.00 | one-time |
| Soulver 4 | $59.00 | one-time |

**What reviewers like**

- 💻 Powerful calculation tool
- 📝 Seamless note-taking integration
- 🔢 Intuitive natural language input
- 🗂️ Organized folder and sheet management
- ⚙️ Extensive unit conversion capabilities

**What reviewers complain about**

- 💰 Expensive one-time purchase price
- 🔁 Separate purchases for Mac, iPad, and iPhone
- 🤖 AI integration requires additional subscription
- 🐛 Occasional crashes and bugs reported
- 📊 Limited spreadsheet-like functionality

**Reported bugs**

- Crashes when using certain emojis in sheet titles
- Issues with iCloud sync and data migration from older versions
- Inconsistent behavior when modifying variables and formulas

**Requested features**

- Improved iPad and iPhone UI/UX
- Enhanced data export and sharing options
- More advanced mathematical and scientific functions
- Ability to define custom units and unit conversions


### Nitro PDF Pro

[App page](https://appshunter.io/ios/app/nitro-pdf-pro-read-and-edit/id1608616539)

Edit, annotate, and secure PDF documents on the go. This app offers powerful tools for professionals to manage PDFs, including mobile scanning and AI-powered data extraction. Seamlessly integrate with cloud services and use styluses for precise markups.

**Highlights:** Edit and annotate PDFs with precision tools, Organize pages, merge, and extract PDFs, Mobile scanning with OCR for searchable PDFs, Secure documents with password protection, AI-powered data extraction from tables, Seamless integration with cloud storage

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $19.99 | per year |
| Nitro PDF Pro for iOS | $9.99 | one-time |

**What reviewers like**

- 👍 Helpful for managing project documents
- 👍 Convenient for PDF modifications
- 👍 Superior PDF handling on Mac
- 👍 Satisfactory in both Mac and Windows environments

**What reviewers complain about**

- 👎 Pro features not available on iOS/iPadOS
- 👎 Yearly charges for basic features
- 👎 Expensive and useless
- 👎 Fails to deliver promised features
- 👎 Impossible to reorder PDF files

**Reported bugs**

- Cannot reorder PDF files
- Crashes when opening PDFs from websites/email
- Does not save markups or documents
- Difficulty creating new folders
- Cannot rotate pages

**Requested features**

- Keyboard support (Cmd + F for search)
- Ability to cancel search with Esc
- OCR and conversion to text documents on tablets
- User manual for iPad app
- Support for Apple Pencil


## Frequently asked questions

### Is Soulver 4 free?

Soulver 4 is free to download, with in-app purchases available.

### Is Nitro PDF Pro free?

Nitro PDF Pro is free to download, with in-app purchases available.

### Which has better reviews, Soulver 4 or Nitro PDF Pro?

Soulver 4 is rated higher. Soulver 4 averages 4.9 out of 5 from 436 ratings, while Nitro PDF Pro averages 3.9 from 161 ratings.

### Do Soulver 4 or Nitro PDF Pro have ads?

Neither Soulver 4 nor Nitro PDF Pro shows ads.

### Which is updated more often, Soulver 4 or Nitro PDF Pro?

Soulver 4 ships an update monthly, and Nitro PDF Pro every 2 months. Most recently, Soulver 4 was updated on November 7, 2026 and Nitro PDF Pro on November 3, 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.*