Under appreciated
I cannot day enough about how important this app and its original book are to the study of Logic.
Archived App (Last seen on 12 May 2026)
This is an archived listing of the app previously available on the App Store.Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.
About
This app offers a novel approach to syllogistic reasoning, simplifying traditional logic with visual schematics. It also expands syllogisms to incorporate numerical quantification, allowing for more precise logical arguments.
✓New approach to traditional syllogism
✓Visual schematics for arguments
✓Numerical expansion of syllogisms
✓Interactive arrow-based conclusions
✓Tutorial for new logic methods
Show original description
What's New in ReasonLines
1.3
March 7, 2024
Minor updates and bug fixes.
User reviews
FAQ
What is the new approach to syllogisms in ReasonLines?
ReasonLines bundles statements with their equivalents into schematics represented by arrows. Users select premise schematics and follow arrows to display entailed conclusions, simplifying traditional argument structure.
How does ReasonLines expand traditional syllogisms numerically?
ReasonLines makes explicit the numerical interpretation of quantifiers like 'some,' 'all,' and 'no.' It allows for replacing traditional zero and one with other numbers, enabling more precise logical statements and calculations.
Is ReasonLines suitable for beginners in logic?
Yes, Part One of the Help page in ReasonLines provides a tutorial for its new approach to syllogisms, making it accessible for users new to formal logic.
What devices does ReasonLines support?
ReasonLines is available on iPhone, iPad, and iPod, making it accessible across a range of Apple mobile devices.
How often is ReasonLines updated?
The latest version of ReasonLines is 1.3, last updated on March 7, 2024. This indicates regular maintenance and potential feature additions.
What is the age rating for ReasonLines?
ReasonLines has an age rating of 4+, suggesting it is suitable for a wide audience, including younger learners interested in logic.
Does ReasonLines have ads?
No, ReasonLines does not contain advertisements, providing an uninterrupted learning experience for its users.
What is the price of ReasonLines?
ReasonLines is available for a one-time purchase of $0.99, offering an affordable entry into advanced logical reasoning tools.