---
title: "Logic 101 - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "You thought logic would be easier than math. Now you're doing derivations and it's too late to drop the course. This app is for you.  - Checks the syntax of symbolic sentences. - Tests whether the der"
---

# Logic 101 — United States

![Logic 101 App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/24/50/a7/2450a760-f5eb-6d2c-682a-dd9ded017c38/AppIcon-1x_U007emarketing-0-5-0-85-220.png/434x0w.png)

**Developer:** [D. Johnston](https://apptail.io/developer/d-johnston-vWXb)
**Category:** Education
**Rating:** 1.1/5 (11 ratings)
**Price:** Free
**Bundle ID:** com.hatzicware.logic101
**Store:** Apple App Store
**Country:** United States
**Version:** 2.2 (released 2020-05-23)
**Original Release:** 2009-08-29
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id327944112)
**AppTail Page:** [https://apptail.io/app/logic-101-Hodg/united-states](https://apptail.io/app/logic-101-Hodg/united-states)

## Logic 101 Description
You thought logic would be easier than math. Now you're doing derivations and it's too late to drop the course. This app is for you.

- Checks the syntax of symbolic sentences.
- Tests whether the derivation is complete.
- Derivable lines are coloured blue; hypotheses are coloured green.
- Provides an annotation of the derivation, showing line justifications.
- Annotated derivations can be emailed as RTF files.

See the complete app help files here:


See a list of the app's selectable derivation rules here:


## Logic 101 Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/45/65/3d/45653d4f-a767-d510-b683-26ec59435296/pr_source.png/640x920.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/11/b1/ff/11b1ff2d-c675-9bf2-72f4-541a68d6fea1/pr_source.png/640x920.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/e8/4d/d7/e84dd783-4d48-9d44-1a13-363e1dd986f9/pr_source.png/640x920.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/23/10/b5/2310b564-1ec5-3e03-ea52-6ef2ede452a0/pr_source.png/640x920.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/12/6c/99/126c9971-f557-8e8e-5173-e1f9f0308d80/pr_source.png/640x920.png)

## Logic 101 Rating Breakdown in United States
- 5 stars: 0 (0%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 1 (9%)
- 1 stars: 10 (91%)

## Logic 101 Reviews in United States

### **--- "The App does Work as a proof checker"
This app does work.  It can tell you if your argument proofs have errors or when they are free from errors.  That is all it is there for.

This app does not TEACH you how the inference rules work and this app does not walk you through a proof. You must already KNOW what you are doing and you are checking to see if your proof works. This is fine for someone with lots of experience and wants confirmation that a particular proof works out.

Can this app be improved?  YES, all they need to do is constantly update the features. We know the checking capabilities work. You can enter proofs done from a textbook and the checker will show the layout and validity of the proof.  All they need now is some modules that explain and teach concepts. Explain and introduce concepts and walkthrough some proofs so users can see the concepts applied would make an awesome app.  As is this only checks proofs only and you need to understand that before you purchase.
-- logicreasoner, 2022-09-02

### *---- "Not what it sounds like"
I thought this was supposed to teach logic, which is what the title of the app indicates: “Logic 101.” What it actually does, I have no idea. Useless. Stealing money is what it does. More pawns of predatory, nihilistic capitalism. Congratulations.
-- rey_80, 2021-05-25

### *---- "Absolutely Useless"
I bought this thinking maybe the other reviewers just couldn’t figure out how to work it or it had been updated since their reviews... NO. GARBAGE. And even once I thought I was getting the answers I needed, those turned out to be completely wrong. This is the biggest waste of time and money on this marketplace. Just use Chegg or Google it if you need homework answers.
-- Pinkie pie :D, 2020-12-06

### *---- "Worst app ever"
This app supposed to help solving symbolic problems but it doesn’t do anything
-- Maral.pi, 2018-11-09

### *---- "Don’t buy!"
I’m not sure what this app was supposed to accomplish but it certainly does not meet the advertised goal of natural deduction
-- Sean Velo, 2018-07-09

### *---- "Terrible App"
This App did not help what so ever. Total waste of money! No support either
-- Bigfrye, 2016-11-26

### *---- "Usability nightmare!"
Nice idea, but it's extremely basic and a usability nightmare! You have to memorize shift-key combinations to add logical symbols. I find Notepad and a makeshift symbol-scheme to be more effective.
-- ryrw, 2010-12-04

[View all Logic 101 reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)



## Logic 101 Discovered Keywords
- logic 101

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## Logic 101 Available In
- [United States](https://apptail.io/app/logic-101-Hodg/united-states)
- [Canada](https://apptail.io/app/logic-101-Hodg/canada)
- [Italy](https://apptail.io/app/logic-101-Hodg/italy)
- [Spain](https://apptail.io/app/logic-101-Hodg/spain)
- [Australia](https://apptail.io/app/logic-101-Hodg/australia)
- [Ukraine](https://apptail.io/app/logic-101-Hodg/ukraine)
- [United Arab Emirates](https://apptail.io/app/logic-101-Hodg/united-arab-emirates)
- [South Africa](https://apptail.io/app/logic-101-Hodg/south-africa)
- [Germany](https://apptail.io/app/logic-101-Hodg/germany)
- [United Kingdom](https://apptail.io/app/logic-101-Hodg/united-kingdom)
- [Croatia](https://apptail.io/app/logic-101-Hodg/croatia)
- [Saudi Arabia](https://apptail.io/app/logic-101-Hodg/saudi-arabia)

---

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