Comparison

Lexicon LSAT vs Premise One

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Lexicon LSAT

Features
Read full description

Lexicon LSAT is a personal LSAT coach that lives on your phone. Most prep apps hand you a question bank and wish you luck. Lexicon does the opposite: it watches how you think, finds the exact reasoning traps you keep falling for, and builds practice around your specific weak spots. MEET LEX, YOUR AI COACH Lex is a conversational LSAT coach. Ask why an answer is wrong, work through a tough Logical Reasoning question step by step, or have Lex build a focused lesson on the question type that's costing you points. Lex remembers your history and adapts every session. PRACTICE THAT ADAPTS TO YOU - AI-generated questions tuned to your weak spots — not a static bank everyone drills - Every Logical Reasoning question type on the current LSAT, individually targetable - A diagnostic that gives you a live, honest score estimate from day one RECOVER FROM EVERY MISS Get a question wrong and Lexicon doesn't just show you the answer. It generates five more questions built around the same trap, so you fix the pattern instead of memorizing one explanation. SEE WHERE YOU'RE LOSING POINTS Lexicon tracks your recurring error patterns across every question type and stack-ranks them, so you always know exactly what to drill next. FREE TO START - Curated bank drills - Full diagnostic and score estimate - Streak tracking and daily reminders No card required to begin. LEXICON & LEXICON PRO Upgrade to unlock the Lex AI coach, AI-generated drills tuned to your weaknesses, and 5x recovery loops on every miss. Every new account gets a 7-day free trial of everything. Pricing is shown in the app before any purchase. Built for the current LSAT format. --- Subscription details: Lexicon and Lexicon Pro are auto-renewable subscriptions, available monthly or annually. New subscribers get a 7-day free trial. Payment is charged to your Apple ID at confirmation of purchase. Your subscription renews automatically unless cancelled at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours prior to the end of the period. Manage or cancel anytime in iPhone Settings > Apple ID > Subscriptions. Privacy Policy: https://hilarious-panda-338af3.netlify.app/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Premise One

This app teaches critical thinking and reasoning skills through structured lessons on logic, from fundamental concepts to advanced formal and philosophical topics. It helps users identify fallacies, analyze arguments, and strengthen their understanding with interactive exercises and quizzes.

Highlights
  • Structured logic lessons
  • Formal and philosophical logic
  • Identifying logical fallacies
  • Argument analysis
  • Interactive exercises
  • Practice questions and quizzes
Features
Read full description

Premise One is a comprehensive learning app designed to help you think clearly, reason effectively, and understand the logic behind every argument. Whether you’re completely new to logic or ready to explore advanced concepts, Premise One takes you from the foundations of reasoning to deeper areas of formal and philosophical logic through structured, easy-to-understand lessons. START WITH THE FUNDAMENTALS Learn how arguments work by exploring premises, conclusions, deductive and inductive reasoning, validity, soundness, and necessary and sufficient conditions. MASTER THE LANGUAGE OF LOGIC Progress into propositional logic, conditional reasoning, categorical syllogisms, predicate logic, quantifiers, identity, predication, and symbolic notation. Learn what symbols like ¬, ∧, ∨, →, ↔, ∀, ∃, □, and ◇ mean and how to use them. SPOT BAD REASONING Learn to recognize common logical fallacies, including straw man arguments, ad hominem attacks, false dilemmas, circular reasoning, equivocation, special pleading, non sequiturs, and more. GO DEEPER Explore modal and philosophical logic through concepts such as possibility, necessity, contingency, possible worlds, identity, essence, contradictions, counterfactuals, and logical consequence. PUT YOUR REASONING TO THE TEST Strengthen your understanding through examples, practice questions, argument analysis, interactive exercises, and quizzes designed to help you apply what you learn. Premise One isn’t about telling you what to think. It’s about teaching you how to think. Question assumptions. Analyze arguments. Follow the evidence. Understand why a conclusion follows—or why it doesn’t. Premise One — Where Reasoning Begins.

Screenshots

Lexicon LSAT4 screens
Premise One4 screens

Verdict

The call

The clearest difference is in-app purchases: Premise One at none against Lexicon LSAT's 4. Premise One also leads on device support (3 vs 1). On price, ads and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Lexicon LSAT sells 4 in-app purchases, starting at $19.99 per month. Premise One asks for nothing beyond the download.

Scorecard2 real differences · 7 level
Lexicon LSAT versus Premise One: the parameters behind the verdict, then further details
ParameterLexicon LSATPremise One
PriceFreeFree
Rating—5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.015.1 — better
Further details — not scored
Size54 MB189 MB
Age rating4+4+
DeveloperPhineas PambianchiNASIF FRANKLIN

In-app purchases

4 purchases

Lexicon LSAT

Subscriptions4
  • Lexicon Monthly7 Days trial$19.991 Month
  • Lexicon Pro Monthly7 Days trial$29.991 Month
  • Lexicon Yearly7 Days trial$179.991 Year
Show 1 more
  • Lexicon Pro Yearly7 Days trial$269.991 Year
None

Premise One

No in-app purchases

Questions

Is Lexicon LSAT free?
Lexicon LSAT is free to download, with in-app purchases available.
Is Premise One free?
Premise One is free to download, with no in-app purchases.
Do Lexicon LSAT or Premise One have ads?
Neither Lexicon LSAT nor Premise One shows ads.

Other comparisons