# FIRSTLIGHT READER vs Chemistry AI

The clearest difference is in-app purchases: FIRSTLIGHT READER at none against Chemistry AI's 3. Chemistry AI's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Chemistry AI sells 3 in-app purchases, starting at $3.99 per 7 days. FIRSTLIGHT READER asks for nothing beyond the download.

FIRSTLIGHT READER ships an update every 4 months, Chemistry AI every 2 weeks. The most recent releases landed on September 10, 2026 and August 18, 2026 respectively.

## The numbers

| Metric | FIRSTLIGHT READER | Chemistry AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Size | 74 MB | 52 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Caelestis Production, Inc.](https://appshunter.io/developer/1542218191) | [Yaroslav Trofimov](https://appshunter.io/developer/1851395994) |

## What reviewers say

### FIRSTLIGHT READER

[App page](https://appshunter.io/ios/app/firstlight-reader/id1542218189)

**In-app purchases:** none


### Chemistry AI

[App page](https://appshunter.io/ios/app/chemistry-ai-problem-solver/id6757663773)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Week | $3.99 | per 7 days |
| Premium Monthly | $6.99 | per month |
| Premium Yearly | $39.99 | per year |


## Frequently asked questions

### Is FIRSTLIGHT READER free?

FIRSTLIGHT READER is free to download, with no in-app purchases.

### Is Chemistry AI free?

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

### Do FIRSTLIGHT READER or Chemistry AI have ads?

FIRSTLIGHT READER shows ads; Chemistry AI does not.

### Which is updated more often, FIRSTLIGHT READER or Chemistry AI?

FIRSTLIGHT READER ships an update every 4 months, and Chemistry AI every 2 weeks. Most recently, FIRSTLIGHT READER was updated on September 10, 2026 and Chemistry AI on August 18, 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.*