# Calculator # vs One Converter

The clearest difference is review sentiment: Calculator # at 60% against One Converter's 11%. Calculator # also leads on rating (4.6 vs 2.0) and ratings volume (36K vs 7). One Converter's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 2 months). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Calculator # sells 6 in-app purchases, starting at $1.49 per month and One Converter sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Calculator # holds the better App Store score, 4.6 against 2.0. That said, the two scores are not equally well evidenced: Calculator # has 36K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 60% of Calculator #'s written reviews are positive against 11% of One Converter's.

Calculator # ships an update every 2 months, One Converter every 2 weeks. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Calculator # | One Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (36K ratings)](https://appshunter.io/ios/app/calculator/id458535080/reviews)** | [2.0 (7 ratings)](https://appshunter.io/ios/app/one-converter-unit-calculator/id1357652887/reviews) |
| Number of ratings | **36K** | 7 |
| Positive reviews | **59.5% of reviews** | 11.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 57 MB | 15 MB |
| Requires iOS | **12.1** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Incpt.Mobis](https://appshunter.io/developer/445261166) | [Novvio, Inc.](https://appshunter.io/developer/1357247399) |

## What reviewers say

### Calculator #

[App page](https://appshunter.io/ios/app/calculator/id458535080)

This multi-function calculator offers basic to advanced scientific and algebraic computations. It includes features like handwriting recognition, equation solvers, and 2D graphing, making it suitable for students and professionals. In-app purchases unlock advanced capabilities.

**Highlights:** Math Photos Solver, Handwriting Recognition, AI Math Problem Solver, Mathematical Display, Equation Solvers, 2D Graphing, Algebraic Functions

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Upgrade 1 Month | $1.49 | per month |
| PRO Upgrade 3 Months | $2.99 | per 3 months |
| PRO + Recognition 1 Month | $4.99 | per month |
| PRO + Recognition 3 Months | $11.99 | per 3 months |
| 250 AI Recognition & Queries | $0.99 | one-time |
| 600 AI Recognition & Queries | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Powerful functionality
- 💡 Helpful for math classes
- ⭐ Great for students
- 👌 Works like a real calculator

**What reviewers complain about**

- 🔍 Confusing interface after update
- 📢 Too many intrusive ads
- 💰 Paywall for advanced features
- 🐛 Incorrect calculations
- 🔇 Loud audio ads

**Reported bugs**

- Crashes when trying to use certain functions
- Handwriting recognition not working reliably
- Inability to input negative numbers

**Requested features**

- Add option to turn off animation
- Improve ad placement to avoid obstructing usage
- Provide more transparency on paid features


### One Converter

[App page](https://appshunter.io/ios/app/one-converter-unit-calculator/id1357652887)

Easily convert between thousands of measurement units for daily life, lessons, or work. This tool offers a simple interface to convert any unit within various categories, including length, velocity, temperature, mass, volume, and more. It functions entirely offline, making it a convenient measurement conversion tool.

**Highlights:** Extensive unit conversion categories, Simple and useful interface, Offline functionality, Supports thousands of units, Daily life, lessons, and work utility, Metric and US measurement support

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unit & Metric Converter Plus | $1.99 | one-time |
| Unit Converter & Calculator | $3.99 | one-time |
| Measurement Unit Converter Pro | $4.99 | one-time |
| Unit & Metric Converter Plus | $4.99 | one-time |
| Unit Conversion Calculator Pro | $5.99 | one-time |


## Frequently asked questions

### Is Calculator # free?

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

### Is One Converter free?

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

### Which has better reviews, Calculator # or One Converter?

Calculator # is rated higher. Calculator # averages 4.6 out of 5 from 36K ratings, while One Converter averages 2.0 from 7 ratings.

### Do Calculator # or One Converter have ads?

Calculator # shows ads; One Converter does not.

### Which is updated more often, Calculator # or One Converter?

Calculator # ships an update every 2 months, and One Converter every 2 weeks. Most recently, Calculator # was updated on November 6, 2026 and One Converter on November 2, 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.*