# Symbols: Learn Logic — Learn Symbolic Logic Easily

> App for learning symbolic logic and rules of inference with interactive exercises. (iPhone/iPad app by Matthew Rayes.)

- Source: https://appshunter.io/ios/app/symbols-learn-logic/id1642996557 (this page in markdown: same URL + `.md`)
- Developer: [Matthew Rayes](https://appshunter.io/developer/1642996559)
- Category: Education, Games, Puzzle, Strategy
- Price: Free with in-app purchases
- Rating: 4.50/5 from 8 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 78 MB
- Languages: English
- Released: 2022-09-18
- Data updated: 2026-06-01
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/symbols-learn-logic/id1642996557/reviews.md

## What is Symbols?

Learn logic with Symbols, the app that teaches natural deduction and the rules of inference in an intuitive, accessible way. Our unique Studycards feature visual pictographs and interactive, step-by-step exercises that allow you to grasp each rule easily and quickly. Then, challenge yourself with activities specifically designed to practice those rules, building your skills progressively, and cementing them in your memory with every level completed.

Why Symbols?

Comprehensive Studycards: Learn essential rules like Modus Ponens, Modus Tollens, Disjunctive Syllogism, and many more through clear explanations and examples. Perfect for students and anyone looking to understand formal logic.

Engaging Activities for Skill Mastery:

Validity: Sharpen your critical thinking by evaluating pre-solved arguments. This unique activity provides the benefits of repetition without the tedium, helping you apply, recognize, and grow familiar with the rules of inference.  

Justification: Challenge your understanding with puzzle-like scenarios where you deduce missing argument steps. This deepens your comprehension and refines your application of logical rules within complex arguments.

Inference: By this stage, the training wheels are off, and the student has to draw on everything they've learned so far. Their task is to mentally build a valid argument from what’s provided—or to recognize that no valid argument can be formed. What would normally be worked out slowly on paper is now done at the speed of thought.

Translation: Translation helps students practice turning statements with indicator words and phrases into logical form. These indicator words, commonly found in logic books and courses, give students a sense of how to translate everyday language into formal logic. Translation breaks this process into levels, allowing students to track their progress and earn new scores as they build proficiency.

Download Symbols for free and begin your journey into formal logic. Your free access includes the first level of every activity and the Modus Ponens study card, a must-have for getting started. For more advanced content and features, simply use our in-app purchases to continue building your logic skills.

Start your journey of mastering the rules of inference now!

## Key features

- Comprehensive Studycards with clear explanations
- Interactive activities for skill mastery
- Validity: Evaluate pre-solved arguments
- Justification: Deduce missing argument steps
- Inference: Build valid arguments
- Translation: Convert statements to logical form

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly Subscription | $6.99 | per month |
| Three Month Subscription | $18.99 | per 3 months |
| Annual Subscription | $39.99 | per year |
| Monthly Subscription | $3.99 | per month |
| Yearly Subscription | $24.99 | per year |
| Weekly subscription | $3.99 | per 7 days |


## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/symbols-learn-logic/id1642996557/reviews.md

### 5/5 — Essential App for using Logic

*2024-12-13, version 1.0.7*

Essential for reviewing arguments

### 5/5 — Symbolic Logic Lovers: Great App for Downtime (No More Endless Phone Scrolling!)

*2024-01-14*

I am someone who took a few formal logic courses in college and fell in love with symbolic logic. I have long been looking for some kind of simple phone application that would allow me to practice/review logic skills for fun during the times where I would both like to avoid using my computer for hobbies such as taking free courses but would also prefer to avoid simply surfing the internet on my phone. 

I had envisioned an application for symbolic logic that would be similar to the multiplication and division sheets I loved completing back in elementary school—simple, straightforward, effective, and fun. This app fits the bill perfectly. I want to thank the developer(s) for creating my dream application. No more mindlessly scrolling on my phone while waiting for appointments or relaxing at the end of the day—now I have symbolic logic to fill that void!

**Developer response:** Thank you so much for your thoughtful feedback! In many ways, what you envisioned was also the guiding vision for this app. I often wondered why there were so many arithmetic apps—like the multiplication and division tables you mentioned—but none for argument forms. The goal was to create something similar to those arithmetic apps but for symbolic logic.

Moreover, the idea of replacing mindless scrolling with logic exercises is exactly what I hoped the app would do during moments of downtime. Thank you again for your kind words! I'm truly grateful for your support and for sharing this feedback!

### 4/5 — Certain problems are wrong, other than that it’s a cool app

*2023-06-30*

In one game, you have to translate words into symbolic logic. One example is “If X, then Y”, which would be represented as: X ⇒ Y. 
One problem actually is incorrect, from what i’ve found. “Only if” is represented as a conditional with the antecedent and the consequent flipped. “X only if Y” is not X ⇒ Y, it’s Y ⇒ X. That’s why a biconditional is spoken as if and only if, it includes both the “if” and “only if”.

Other than that, it’s a cool app.

**Developer response:** First off, thank you very much for the kind words!

I am looking at the studycard for the implication's "only if" translation, and I see that as you have stated, given the statement "X only if Y", the translation is X → Y. Before moving on any further think about the statement for a moment.

"X only if Y"--in other words--the statement is conveying to us that Y is a necessary condition for X. The necessary condition is the consequent, therefore, X → Y is the correct translation. 

If you have any more questions or feedback, just shoot me an email at hello@symbols-app.com.

### 5/5 — Fantastic logic trainer

*2023-03-30, version 1.0.4*

Perfect app to practice logic in formal yet manageable way. Does exactly what it says it does, and does it well. 

Highly recommended.

### 4/5 — Great Learning Tool, learning progress should be shared across activities

*2022-11-06*

This app teaches you how to do symbolic logic. There are several activities, and several levels. The first level is extremely simple. To proceed to the next level, you must complete the current level several times. My complaint is that arduous progress in one activity is not shared to the other activities that use the same logic. I don’t want to train modus ponens separately for each game.

**Developer response:** Firstly, I would like to thank you for giving Symbols Logic a try, your kind words, and the high rating that you gave it.

Your complaint is not without merit, but it is a consequence of a design decision. The decision was to create Activities that are self-contained, since each Activity is different and focused on teaching something unique. Yes, you are right in that you will be faced with modus ponens in Validity and then again in Justification and Inference, but each one of these Activities is asking a different question about it. Validity asks, “Were the steps applied correctly?” Justification asks, “What is missing for the steps to be applied correctly?” Inference may hide several steps (sub-conclusions) and asks, “Is this correct?” These questions may seem redundant, but each one of them is different and they are designed to further a user’s understanding in a different way. The goal is to have these rules and their patterns so well ingrained in your mind that you can recognize them (or any sequence of them) effortlessly in your sleep.

Again, thanks for giving us a try!

## Frequently asked questions about Symbols

### What is Symbols: Learn Logic?

Symbols: Learn Logic is an educational app designed to teach symbolic logic and the rules of inference. It uses interactive exercises and visual study cards to help users grasp logical concepts.

### What logic rules does Symbols: Learn Logic teach?

Symbols: Learn Logic teaches essential rules of inference such as Modus Ponens, Modus Tollens, and Disjunctive Syllogism. It provides clear explanations and examples for each rule.

### What types of activities are available in Symbols: Learn Logic?

The app features activities like Validity (evaluating arguments), Justification (deducing missing steps), Inference (building arguments), and Translation (converting statements to logical form).

### Is Symbols: Learn Logic free to download?

Yes, Symbols: Learn Logic is free to download. Your free access includes the first level of every activity and the Modus Ponens study card.

### How does Symbols: Learn Logic handle advanced content?

For more advanced content and features, users can utilize in-app purchases to continue building their logic skills beyond the free introductory levels.

### What are the subscription options for Symbols: Learn Logic?

Symbols: Learn Logic offers various subscription plans, including weekly (with a 3-day free trial), monthly, three-month, and yearly options, with prices ranging from $3.99 to $24.99.

### What devices is Symbols: Learn Logic compatible with?

Symbols: Learn Logic is compatible with iPhone, iPad, and iPod devices.

### How often is Symbols: Learn Logic updated?

The app was last updated on September 23, 2025, indicating ongoing development and support.

## Version history (last 5 releases)

### 1.1.0 — 2025-09-23

Symbols: Learn Logic now lets you easily review any questions you missed. A new "Review Incorrect Questions" section—added by popular request—appears at the end of each activity, so every step forward can be a little clearer.

Your feedback continues to shape the app. Thank you.

### 1.0.11 — 2025-07-13

Symbols: Learn Logic now has a streamlined onboarding flow, reduced app clutter, and general bug fixes for a better experience.

### 1.0.8 — 2025-03-26

The "Suggested Studycards" section in the Activity Detail page has been improved, and I added new animations to better communicate intent. Under the hood, build tools and underlying frameworks have been updated. Additionally, new users will benefit from a redesigned onboarding process that clearly explains what they get and the purpose of Symbols Logic.

### 1.0.7 — 2023-12-17

Minor bug fixes for later levels in "Justification" activity.

### 1.0.6 — 2023-04-22

General bug fixes, avoid unnecessary re-renderings, and solved some subtle UI issues.

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## More apps by Matthew Rayes

- [Poopi: Dog Health Journal](https://appshunter.io/ios/app/poopi-dog-health-journal/id6670435183)

All apps by Matthew Rayes: https://appshunter.io/developer/1642996559

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*