# Calculator # vs HPLC Advisor

The clearest difference is rating: Calculator # at 4.6 against HPLC Advisor's 4.0. Calculator # also leads on ratings volume (36K vs 2) and review sentiment (71% vs 50%). HPLC Advisor's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Calculator # sells 6 in-app purchases, starting at $1.49 per month. HPLC Advisor asks for nothing beyond the download.

Calculator # holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: Calculator # has 36K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 71% of Calculator #'s written reviews are positive against 50% of HPLC Advisor's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 12, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Calculator # | HPLC Advisor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (36K ratings)](https://appshunter.io/ios/app/calculator/id458535080/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/hplc-advisor/id1566882318/reviews) |
| Number of ratings | **36K** | 2 |
| Positive reviews | **70.7% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 57 MB | 24 MB |
| Requires iOS | 12.1 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Incpt.Mobis](https://appshunter.io/developer/445261166) | [Agilent Technologies, Inc](https://appshunter.io/developer/355827609) |

## 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


### HPLC Advisor

[App page](https://appshunter.io/ios/app/hplc-advisor/id1566882318)

This app provides tools for HPLC troubleshooting, method development, and data management. It offers calculators for method translation and performance prediction, a data library with conversions and formulas, and troubleshooting guides. Works offline for all HPLC instruments.

**Highlights:** HPLC troubleshooting guides, Method translation calculator, Chromatographic performance calculator, LC-related data library, Offline functionality, Universal instrument compatibility

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculator # free?

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

### Is HPLC Advisor free?

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

### Which has better reviews, Calculator # or HPLC Advisor?

Calculator # is rated higher. Calculator # averages 4.6 out of 5 from 36K ratings, while HPLC Advisor averages 4.0 from 2 ratings.

### Do Calculator # or HPLC Advisor have ads?

Calculator # shows ads; HPLC Advisor does not.

### Which is updated more often, Calculator # or HPLC Advisor?

Calculator # ships an update every 2 months, and HPLC Advisor every 2 months. Most recently, Calculator # was updated on November 12, 2026 and HPLC Advisor 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.*