# Chemistry AI vs Assessment Lock

The clearest difference is in-app purchases: Assessment Lock at none against Chemistry AI's 4. Assessment Lock also leads on update cadence (every 3 days vs weekly) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Chemistry AI sells 4 in-app purchases, starting at $4.99 per 7 days. Assessment Lock asks for nothing beyond the download.

Chemistry AI ships an update weekly, Assessment Lock every 3 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Chemistry AI | Assessment Lock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chemistry-ai-problem-solver/id6756354407/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 67 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aitolkyn Abdulvakhapova](https://appshunter.io/developer/1775616199) | [Vretta Inc.](https://appshunter.io/developer/561069753) |

## What reviewers say

### Chemistry AI

[App page](https://appshunter.io/ios/app/chemistry-ai-problem-solver/id6756354407)

This app provides instant, step-by-step solutions to chemistry problems by simply taking a photo. It offers clear explanations, generates study aids like flashcards and quizzes from notes, and includes essential chemistry tools.

**Highlights:** Instant photo-based problem solving, Step-by-step solution explanations, Auto-generated flashcards and quizzes, Interactive Periodic Table, Smart Chemistry Calculator, Quick Cheat Sheets

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chemistry Pro | $4.99 | per 7 days |
| Chemistry Pro | $6.99 | per 7 days |
| Chemistry Pro | $29.99 | per year |
| Chemistry Pro | $59.99 | per year |


### Assessment Lock

[App page](https://appshunter.io/ios/app/assessment-lock/id6782085725)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Chemistry AI free?

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

### Is Assessment Lock free?

Assessment Lock is free to download, with no in-app purchases.

### Do Chemistry AI or Assessment Lock have ads?

Neither Chemistry AI nor Assessment Lock shows ads.

### Which is updated more often, Chemistry AI or Assessment Lock?

Chemistry AI ships an update weekly, and Assessment Lock every 3 days. Most recently, Chemistry AI was updated on October 30, 2026 and Assessment Lock on October 31, 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.*