# Chemical Solution Simple vs NotesPro AI

The clearest difference is price: NotesPro AI at Free against Chemical Solution Simple's $2.99. NotesPro AI also leads on update cadence (every 3 weeks vs every 3 months) and ratings volume (7 vs 1). Chemical Solution Simple's advantage is in-app purchases (none vs 2). On rating, review sentiment, ads and device support there is nothing between them.

NotesPro AI is free to download; Chemical Solution Simple costs $2.99 up front. NotesPro AI sells 2 in-app purchases, starting at $14.99 per month. Chemical Solution Simple asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Chemical Solution Simple against 5.0 for NotesPro AI. That said, the two scores are not equally well evidenced: NotesPro AI has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Chemical Solution Simple ships an update every 3 months, NotesPro AI every 3 weeks. The most recent releases landed on October 10, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Chemical Solution Simple | NotesPro AI |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/chemical-solution-simple/id1080912267/reviews) | [5.0 (7 ratings)](https://appshunter.io/ios/app/notespro-ai/id6749456596/reviews) |
| Number of ratings | 1 | **7** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 34 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Apricot AI](https://appshunter.io/developer/1638182016) |

## What reviewers say

### Chemical Solution Simple

[App page](https://appshunter.io/ios/app/chemical-solution-simple/id1080912267)

This app assists in preparing chemical solutions through dissolution and dilution. It calculates moles, molar masses, required solute weights, and starting solution volumes, supporting various concentration units.

**Highlights:** Solution preparation by dissolution, Solution preparation by dilution, Mole calculation, Molar mass analysis, Required solute weight calculation, Starting solution volume calculation, Supports Molar, mM, uM, g/l, mg/l units

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

**In-app purchases:** none


### NotesPro AI

[App page](https://appshunter.io/ios/app/notespro-ai/id6749456596)

This app offers an AI-enhanced note-taking experience, allowing users to record lectures, annotate slides, and generate notes automatically. It also provides AI-powered learning tools like flashcards and a personalized tutor to help users master their study materials.

**Highlights:** Freeform notepad, Annotate on slides/PDFs, Live lecture recording, AI-generated notes, Automatic flashcard creation, Personalized AI tutor, Centralized study hub

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NotesPro - Monthly | $14.99 | per month |
| NotesPro - Annually | $99.99 | per year |


## Frequently asked questions

### Is Chemical Solution Simple free?

Chemical Solution Simple costs $2.99, with no in-app purchases.

### Is NotesPro AI free?

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

### Which has better reviews, Chemical Solution Simple or NotesPro AI?

Chemical Solution Simple and NotesPro AI are both rated 5.0 out of 5 on the App Store, from 1 and 7 ratings respectively.

### Do Chemical Solution Simple or NotesPro AI have ads?

Neither Chemical Solution Simple nor NotesPro AI shows ads.

### Which is updated more often, Chemical Solution Simple or NotesPro AI?

Chemical Solution Simple ships an update every 3 months, and NotesPro AI every 3 weeks. Most recently, Chemical Solution Simple was updated on October 10, 2026 and NotesPro AI on October 15, 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.*