--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Scientific Calculator 991EX" developer_entity: "Murad Yaghi" bundle_id: "org.earthsensing.fx991excalculator" app_store_id: "6801710317" category: "Utilities" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-09-01" report_date: "2026-10-18" last_verified: "2026-10-18T00:00:00.000Z" report_version: "1.0" total_reviews: 0 confidence: "low" confidence_score: 0.2 data_age_days: 11 momentum_velocity: "maintenance" intelligence_version: 2 tags: ["utilities", "freemium", "mobile app", "app review", "app analysis", "students,", "engineers,", "technical"] canonical_url: "https://marlvel.ai/apps/scientific-calculator-991ex" license: "CC-BY-NC 4.0" content_version: "v2" --- # Scientific Calculator 991EX Intelligence Report ## TL;DR {#tldr} - **Category**: Utilities · Freemium > **TL;DR:** Scientific Calculator 991EX is a utilities app by Murad Yaghi, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Scientific Calculator 991EX is a utilities app by Murad Yaghi. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Utilities | | **Developer** | Murad Yaghi | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 11d | ## Metadata & Market Performance - **Publisher:** Murad Yaghi - **Category:** Utilities - **Target Audience:** Students, engineers, and technical professionals requiring advanced mathematical computation tools on mobile devices. - **Platforms:** iOS - **Version Reviewed:** 1.0 - **Report Date:** 2026-10-18 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 6801710317 - **Bundle ID:** org.earthsensing.fx991excalculator - **Data Window:** Analysis based on signals collected up to 2026-10-18 ## Executive Snapshot **What it is:** Scientific Calculator 991EX is a natural-display scientific calculator for students and engineers, offering advanced mathematical workspaces on iOS. **Why users hire it:** It removes the friction of account creation and cloud-sync requirements, serving users who need a permanent, privacy-focused tool for technical work. ## App DNA (Features & Intent) - **[Standard] Natural Display:** Renders fractions, roots, and calculus templates in a structured, textbook-style format. - **[Differentiator] Advanced Workspaces:** Provides ten specialized modes including Matrix, Vector, and Statistics solvers, gated by a one-time purchase. * *User Intent:* Users seek enhanced value through premium features. - **[Differentiator] Local Data Storage:** Saves calculations and history locally without cloud syncing or account requirements. * *User Intent:* Users expect seamless access across multiple devices. ## Market Position {#market-position} Scientific Calculator 991EX targets the technical utility segment with a lifetime-purchase model that contrasts with the subscription-heavy norm. The app's focus on local-only storage creates a distinct value proposition for privacy-conscious users compared to cloud-dependent alternatives. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free tier includes Calculate and Complex modes, Lifetime Pro purchase unlocks ten advanced workspaces - **Analysis:** The one-time non-consumable purchase model provides a clear value proposition for students and engineers who prefer avoiding recurring subscription costs. ## SWOT Analysis {#swot} **Core Strengths:** - Local-only storage removes backend dependency - Natural-display interface provides textbook-style utility **Growth Levers:** - Capture subscription-fatigued users with lifetime-purchase messaging ## App Momentum (Maintenance) {#momentum} - Released initial version in September 2026 - Maintains quiet, maintenance-focused cadence > **Cadence:** 1 total versions · 0 majors in last 6 months · 46 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Scientific Calculator 991EX is an utilities app that is free with in-app purchases. > **Bottom Line:** Scientific Calculator 991EX maintains its position by prioritizing privacy and a one-time purchase model, which effectively differentiates it from subscription-based rivals. Protecting this local-only utility will ensure it remains a reliable tool for its target technical audience. **Best for:** Students, engineers, and technical professionals requiring advanced mathematical computation tools on mobile devices. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Audit local storage performance because users prioritize reliability in technical tools → maintain high retention ### Outlook: Stable The market for technical utilities is consolidating around subscription-based productivity suites, leaving an opening for standalone, privacy-focused tools. Scientific Calculator 991EX is well-positioned to serve this niche as long as it maintains its local-only, no-account architecture. - ⚪ The app maintains a maintenance-focused release cadence, signaling a stable, feature-complete product rather than an active growth phase. - 🟢 The one-time purchase model provides a clear competitive edge against subscription-heavy rivals, attracting users who prefer permanent ownership of their tools. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Scientific Calculator 991EX** (this app) | N/A/5 | N/A | Murad Yaghi | | [Sota Connect: Secure Network](https://marlvel.ai/apps/fi-catconnect-sota) | 4.9/5 | N/A | Cat Connect | | [V2Box - V2ray Client](https://marlvel.ai/apps/v2box-v2ray-client) | 4.6/5 | n/a | techlaim | | [App For Siri Commands Tips](https://marlvel.ai/apps/app-for-siri-commands-tips) | N/A/5 | N/A | Anh La Phan Son | | [avoVPN Desktop](https://marlvel.ai/apps/avovpn-desktop) | N/A/5 | N/A | Avocado VPN Technologies | | [Bin Days - Bin Reminder](https://marlvel.ai/apps/bin-days-bin-reminder) | N/A/5 | N/A | Vicki Partridge | ## Company Profile - **Developer:** Murad Yaghi - **Website:** [https://matinformatics.org/apps/scientific-calculator-fx-991ex](https://matinformatics.org/apps/scientific-calculator-fx-991ex) ## Data Sources & Links - **App Store ID:** 6801710317 - **Dev Site:** [Official Website](https://matinformatics.org/apps/scientific-calculator-fx-991ex) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*Sota Connect: Secure Network*](https://marlvel.ai/apps/fi-catconnect-sota) (Cat Connect) · 4.9/5 Rating - [*V2Box - V2ray Client*](https://marlvel.ai/apps/v2box-v2ray-client) (techlaim) · 4.6/5 Rating - [*App For Siri Commands Tips*](https://marlvel.ai/apps/app-for-siri-commands-tips) (Anh La Phan Son) · N/A Rating - [*avoVPN Desktop*](https://marlvel.ai/apps/avovpn-desktop) (Avocado VPN Technologies) · N/A Rating - [*Bin Days - Bin Reminder*](https://marlvel.ai/apps/bin-days-bin-reminder) (Vicki Partridge) · N/A Rating - [*Controller Tester FGC*](https://marlvel.ai/apps/controller-tester-fgc) (Aaron Lowe) · 5.0/5 Rating - [*Fusvob VPN : Super VPN 2026*](https://marlvel.ai/apps/com-toplinkc-foxexcellent) (Fuxin Technology) · 4.5/5 Rating - [*Gear Ratio Calculator & RPM*](https://marlvel.ai/apps/cog-gear-ratio-calculator) (Linh Phan Nhat Khanh) · N/A Rating - [*MDflow Web Clipper*](https://marlvel.ai/apps/mdflow-web-clipper) (DataOps, s.r.o.) · N/A Rating - [*NordVPN: VPN Fast & Secure*](https://marlvel.ai/apps/com-nordvpn-nordvpn) (Nordvpn S.A.) · 4.7/5 Rating ## Frequently Asked Questions {#faq} ### Is Scientific Calculator 991EX free to use? Yes, the app offers a free tier that includes Calculate and Complex modes. Advanced workspaces like Matrix, Vector, and Statistics require a one-time Lifetime Pro purchase. ### Does Scientific Calculator 991EX require an account? No, the app does not require an account or backend data collection. All calculations and settings are stored locally on your device. ### How does Scientific Calculator 991EX compare to physical calculators? Scientific Calculator 991EX provides a natural-display interface similar to physical scientific calculators but offers the convenience of a mobile app without the need to carry extra hardware. ### Can I sync my calculations across devices? No, Scientific Calculator 991EX stores all data locally on your device and does not support cloud syncing. ## 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:** 0.2/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 0 - **Data Sources:** developer website, 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:** 11 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/scientific-calculator-991ex) Data licensed for AI Agent attribution under CC-BY-NC 4.0.