--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Calculus — formulas" developer_entity: "AppCrab" bundle_id: "net.appcrab.calculus" app_store_id: "1236663426" category: "Education" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2017-09-19" report_date: "2026-09-21" last_verified: "2026-09-21T00:00:00.000Z" report_version: "1.0.0" total_reviews: 3 overall_rating: 5 sentiment: "Thrilled" sentiment_score: 90 confidence: "low" confidence_score: 0.3 top_praise_theme: "Educational video content provides clear learning value that keeps students engaged with the material" review_sample_size: 1 total_review_count: 1 analyzed_review_count: 1 data_age_days: 9 momentum_velocity: "zombie" intelligence_version: 2 tags: ["education", "freemium", "thrilled sentiment", "mobile app", "app review", "app analysis", "students", "preparing", "calculus"] canonical_url: "https://marlvel.ai/apps/calculus-formulas" license: "CC-BY-NC 4.0" content_version: "v2" --- # Calculus — formulas Intelligence Report ## TL;DR {#tldr} - **Category**: Education · Freemium - **Signal**: Rating 5 · Sentiment Thrilled - **Recent focus**: Educational video content provides clear learning value that keeps students engaged with the material (top praise) > **TL;DR:** Calculus — formulas is a education app by AppCrab, rated 5/5 by 3 users, with Thrilled user sentiment (90/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Calculus — formulas maintains Thrilled user sentiment (5/5 from 3 reviews), with users consistently praising educational video content provides clear learning value that keeps students engaged with the material. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 5/5 (3 reviews) | | **User Mood** | Thrilled | | **Category** | Education | | **Developer** | AppCrab | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Low (0.3/1.0) | | **Data Age** | 9d | ## Metadata & Market Performance - **Publisher:** AppCrab - **Category:** Education - **Target Audience:** Students preparing for calculus exams who require a consolidated reference for formulas, textbook material, and video lessons. - **Platforms:** iOS - **Version Reviewed:** 1.0.0 - **Report Date:** 2026-09-21 - **Signal Count:** 1 review analyzed - **Confidence:** Low (0.3/1.0) - **App Store ID (iOS):** 1236663426 - **Bundle ID:** net.appcrab.calculus - **Data Window:** Analysis based on signals collected up to 2026-09-21 ## Executive Snapshot **What it is:** Calculus — formulas is an educational reference app for students, providing a digital textbook and video lessons on iOS. **Why users hire it:** Students use the app to consolidate complex calculus theorems and visual explanations into a single, portable study reference during exam preparation. ## App DNA (Features & Intent) - **[Differentiator] Video Lessons:** Library of 93 video tutorials providing visual explanations for calculus concepts. * *User Intent:* Users need clear guidance to understand and adopt the product quickly. - **[Standard] Calculus Textbook:** Structured digital textbook covering 15 core topics from functions to Taylor’s formula. - **[Standard] Formula Reference:** Curated collection of basic theorems and formulas with accompanying explanations. ## Market Position {#market-position} Calculus — formulas maintains a 5.0 rating on a limited sample of 3 total ratings, reflecting its niche status in the Education category. The 9-year gap since the last update signals a lack of competitive positioning against active learning platforms. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free access to core content, In-App Purchases for additional features - **Analysis:** The app uses a freemium model to gate advanced features behind in-app purchases, though the lack of recent updates makes the value proposition of these purchases unclear. ## 🟢 User Sentiment (Low Confidence: 1 of 1 review analyzed) {#user-sentiment} - **Overall Rating:** 5/5 - **Platform Split:** iOS 5.0/5 (3 ratings) - **Overall Sentiment:** Thrilled ### Top Praises - **Educational video content provides clear learning value that keeps students engaged with the material** ## SWOT Analysis {#swot} **Core Strengths:** - 93-video library provides a visual learning mechanism that drives user satisfaction **Growth Levers:** - Localized textbook content could capture non-English speaking student segments currently underserved ## What's New - **Latest (v1.0.0, 9 years ago):** Resolved issues with In-App Purchases. ## App Momentum (Zombie) {#momentum} - Dormant for 108 months. - Last release occurred September 2017. > **Cadence:** 1 total versions · 0 majors in last 6 months · 3288 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Calculus — formulas is an education app that is free with in-app purchases. It holds a 5/5 rating from 3 reviews. > **Bottom Line:** Calculus — formulas relies on a static content repository that no longer matches the interactive expectations of the current student demographic, necessitating a sunset to avoid brand drag. **Best for:** Students preparing for calculus exams who require a consolidated reference for formulas, textbook material, and video lessons. ### PM Action Plan (Next Best Moves) - [ ] [SUNSET] Sunset the app because the 9-year maintenance gap prevents necessary feature evolution → eliminate brand drag ### Outlook: Declining The educational app market is shifting toward adaptive, AI-driven feedback loops that provide real-time assessment for students. Calculus — formulas remains a static reference tool, and its lack of updates ensures it will continue to lose relevance as students migrate to platforms that offer more than just passive content consumption. - 🔴 The 108-month release silence indicates the product is in maintenance-mode, which prevents it from competing with modern, interactive educational platforms. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 5/5 | | Total Reviews | 3 | | Sentiment | Thrilled (90/100) | | Confidence | Low | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Calculus — formulas** (this app) | 5/5 | Thrilled | AppCrab | | [Catbus Student](https://marlvel.ai/apps/catbus-student) | 4.3/5 | N/A | Cohota Join Stock Company | | [Money Matrix (CAD)](https://marlvel.ai/apps/money-matrix-cad) | 5.0/5 | N/A | Blooming Kids Software LLC | | [Quran Treasure Island for Kids](https://marlvel.ai/apps/quran-treasure-island-for-kids) | 4.9/5 | Mixed | Akeela Manekia | | [Valencia College - MyVC](https://marlvel.ai/apps/valencia-college-myvc) | 5.0/5 | N/A | Valencia College | | [Verbi: Learn a New Language](https://marlvel.ai/apps/verbi-learn-a-new-language) | 4.3/5 | n/a | ACADIA LABS INC. | ## Company Profile - **Developer:** AppCrab ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/calculus-formulas/id1236663426?uo=4) - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*Catbus Student*](https://marlvel.ai/apps/catbus-student) (Cohota Join Stock Company) · 4.3/5 Rating - [*Money Matrix (CAD)*](https://marlvel.ai/apps/money-matrix-cad) (Blooming Kids Software LLC) · 5.0/5 Rating - [*Quran Treasure Island for Kids*](https://marlvel.ai/apps/quran-treasure-island-for-kids) (Akeela Manekia) · 4.9/5 Rating - [*Valencia College - MyVC*](https://marlvel.ai/apps/valencia-college-myvc) (Valencia College) · 5.0/5 Rating - [*Verbi: Learn a New Language*](https://marlvel.ai/apps/verbi-learn-a-new-language) (ACADIA LABS INC.) · 4.3/5 Rating - [*자주 틀리는 우리말*](https://marlvel.ai/apps/app--424) (DaolSoft, Co., Ltd.) · N/A Rating - [*달공부 - 한 달 공부 다이어리 + 루틴/공부 타이머*](https://marlvel.ai/apps/azlabs-dalstudy) (SuWon Choi) · N/A Rating - [*타요콘 - 타요 아바타 놀이동화*](https://marlvel.ai/apps/com-kigle-project-tayocon) (KIGLE) · 3.1/5 Rating - [*천자문 워치*](https://marlvel.ai/apps/app--385) (kim juyoung) · N/A Rating - [*천자문 공부 도우미*](https://marlvel.ai/apps/app--382) (kim juyoung) · 5.0/5 Rating ## Frequently Asked Questions {#faq} ### Is Calculus — formulas still updated in 2026? No, the app has not received an update since September 2017, making it a legacy reference tool rather than an active learning platform. ### Does Calculus — formulas offer interactive practice problems? No, the app focuses on a static textbook and video lessons. It does not provide interactive testing or real-time feedback for students. ### Is Calculus — formulas safe for students to use? The app is rated 4+ and functions as a standard educational reference tool, though its lack of recent updates means it may not be optimized for current iOS versions. ## Methodology {#methodology} This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline: 1. **Signal Collection & Normalization** - Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps. 2. **Feature & Market Positioning Analysis** - Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks. 3. **User Sentiment Analysis** - Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction into synthesised themes (no verbatim quotes). 4. **Competitive Landscape Analysis** - Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category. 5. **Intelligence Synthesis** - Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights. - **Confidence Score:** 0.3/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 1 - **Data Sources:** user reviews, App Store metadata - **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform - **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence. - **Report Age:** 9 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/calculus-formulas) Data licensed for AI Agent attribution under CC-BY-NC 4.0.