Logical Construct & Philosophy vs Avocat du Diable
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Logical Construct & Philosophy
Engage with formal logic through interactive puzzles. Apply inference rules to construct valid proofs, making abstract reasoning concrete and intuitive. Explore propositional and modal logic, with classic philosophical arguments integrated into the learning process.
- Interactive proof construction
- 24 inference rules
- Propositional and modal logic
- Classic philosophical arguments
- Step-by-step solution viewer
- Progress tracking
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Logical Construct is an educational puzzle app that makes formal logic genuinely playable. Instead of passively reading about reasoning, you actively construct valid proofs by applying the same inference rules used by logicians, mathematicians, and philosophers: Modus Ponens, Modus Tollens, Hypothetical Syllogism, Reductio ad Absurdum, and more. Each puzzle gives you a few premises and a target conclusion. Your job is to build a chain of deductions, one rule at a time, until you reach the conclusion. By doing the proofs yourself, not just reading about them, abstract logical concepts become concrete, intuitive skills. You'll progress through propositional logic, work with modal operators of necessity (□) and possibility (◇), and tackle advanced techniques like Conditional Proof and Reductio ad Absurdum. Classic philosophical arguments (the Paradox of Omnipotence, the Problem of Evil, Anselm's Ontological Argument, and Plantinga's modal version of it) become living frameworks for applying these principles. Reasoning that shaped two millennia of philosophy, now something you can practise on your phone. WHAT'S INSIDE • 20 levels, 60 puzzles, from your first Modus Ponens to S5 modal logic • 24 inference rules organised into six categories: conditional, conjunction, disjunction, negation, biconditional, and modal • Step-by-step solution viewer that reveals the proof one move at a time: it shows you the path, it doesn't solve it for you • Truth tables for every propositional rule, with the row where all premises are true highlighted so you can see why the rule is valid • Live formula highlighting that shows which lines a rule will use • Subproofs with Fitch-style indentation: the natural way to learn Conditional Proof and Reductio ad Absurdum • First-launch tutorial that walks you through your very first deduction, plus dedicated intros for subproofs and modal logic • Atom legend on every puzzle: tap to see what each symbol stands for and read the puzzle as a story in plain language • Neumorphic design with colour-coded rule categories • Progress tracking with automatic level unlocking WHO IT'S FOR Students strengthening their formal reasoning, philosophy enthusiasts curious about how arguments actually work, or anyone who enjoys a good puzzle that makes you think clearly. - Privacy Policy: https://sites.google.com/view/logicalconstructapp/accueil - Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Avocat du Diable
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Et si votre pire contradicteur devenait votre meilleur allié ? Avocat du Diable est une application propulsée par l'IA qui argumente toujours CONTRE vous. Défendez une idée, une opinion ou une décision : l'IA la démonte sans complaisance pour muscler votre esprit critique, révéler vos angles morts et affûter vos raisonnements. UN ENTRAÎNEMENT INTELLECTUEL UNIQUE Parce qu'on ne progresse jamais autant qu'en affrontant la contradiction, Avocat du Diable vous confronte à des objections solides, structurées et parfois piquantes. Idéal avant une prise de parole, une négociation, un examen ou simplement pour penser plus clairement. CHOISISSEZ VOTRE INTENSITÉ De « Modéré » à « Sans pitié » : vous décidez à quel point la contradiction pique. À vous de tenir tête. EXPLOREZ DES CENTAINES DE SUJETS Société, éthique, travail, technologie, relations, IA… Parcourez une vaste bibliothèque de sujets tranchés, ou lancez votre propre débat sur n'importe quel thème. LE DÉFI DU JOUR Chaque jour, une nouvelle opinion tranchée à défendre. Enchaînez les défis, construisez votre série et progressez. APPRENEZ LA RHÉTORIQUE Découvrez les sophismes courants (ad hominem, homme de paille, faux dilemme…) et les techniques d'argumentation (steelman, question socratique…) pour débattre comme un pro. SUIVEZ VOTRE PROGRESSION Statistiques, série de jours actifs, défis accomplis : mesurez l'évolution de votre pensée. PREMIUM Passez en illimité : débats sans limite, mode Sans pitié et historique complet. Abonnement hebdomadaire, mensuel ou annuel, avec essai gratuit. Affûtez vos idées. Affrontez le diable. Conditions d'utilisation (EULA standard d'Apple) : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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Verdict
The clearest difference is iOS requirement: Logical Construct & Philosophy at 16.4 against Avocat du Diable's 26.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Logical Construct & Philosophy sells 2 in-app purchases, starting at $3.99 per month and Avocat du Diable sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
| Parameter | Logical Construct & Philosophy | Avocat du Diable |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 weeks | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 — better | 26.0 |
| Further details — not scored | ||
| Size | 51 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Lucainson Raymond | Martine Comte |
In-app purchases
Logical Construct & Philosophy
- Monthly Subscription$3.991 Month
- Annual Plan$19.991 Year
Avocat du Diable
- Premium Hebdomadaire$4.997 Days
- Premium Mensuel$9.991 Month
- Premium Annuel$59.991 Year
Questions
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