# Structural Formulas Study vs Dicter

The clearest difference is price: Structural Formulas Study at Free against Dicter's $1.99. Dicter's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 18.4). On update cadence, ads and in-app purchases there is nothing between them.

Structural Formulas Study is free to download; Dicter costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Structural Formulas Study ships an update every 5 weeks, Dicter every 3 weeks. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Structural Formulas Study | Dicter |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/structural-formulas-study/id6752260162/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | **Free** | Freemium |
| Size | 5 MB | 35 MB |
| Requires iOS | 18.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Jun Yamabe](https://appshunter.io/developer/1732682049) | [SeungHyeon Lee](https://appshunter.io/developer/1581552085) |

## What reviewers say

### Structural Formulas Study

[App page](https://appshunter.io/ios/app/structural-formulas-study/id6752260162)

Explore and study over 100 molecular structures with detailed properties and clear diagrams. This app offers quick search and filtering for efficient exam preparation and daily learning, with offline access available.

**Highlights:** 100+ molecular structures, Detailed structural formulas, Essential chemical properties, Quick search and filters, Offline access, Exam preparation tool

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

**In-app purchases:** none


### Dicter

[App page](https://appshunter.io/ios/app/dicter/id6753685328)

This app uses the Ebbinghaus forgetting curve theory to send timely review reminders for learned material. It features an AI assistant for definitions and questions, and allows easy saving of text from any app to create study cards. Tailored content is available for various learning goals.

**Highlights:** Spaced repetition learning based on forgetting curve, AI-generated definitions and explanations, Save text from any app to create flashcards, Customizable learning content for different goals, Interactive learning and AI-powered Q&A

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Structural Formulas Study free?

Structural Formulas Study is free to download, with no in-app purchases.

### Is Dicter free?

Dicter costs $1.99, with no in-app purchases.

### Do Structural Formulas Study or Dicter have ads?

Neither Structural Formulas Study nor Dicter shows ads.

### Which is updated more often, Structural Formulas Study or Dicter?

Structural Formulas Study ships an update every 5 weeks, and Dicter every 3 weeks. Most recently, Structural Formulas Study was updated on October 12, 2026 and Dicter on October 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.*