--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Calculator ×" developer_entity: "DOUBLE U s.r.o." bundle_id: "com.doubleu.calculator2" app_store_id: "1039645790" category: "Utilities" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2023-12-21" report_date: "2026-09-30" last_verified: "2026-09-30T00:00:00.000Z" report_version: "2.1" total_reviews: 143 overall_rating: 4.5 confidence: "low" confidence_score: 0.2 data_age_days: 0 momentum_velocity: "zombie" intelligence_version: 2 tags: ["utilities", "free", "mobile app", "app review", "app analysis", "iphone", "users", "seeking"] canonical_url: "https://marlvel.ai/apps/calculator-19" license: "CC-BY-NC 4.0" content_version: "v2" --- # Calculator × Intelligence Report ## TL;DR {#tldr} - **Category**: Utilities · Free - **Signal**: Rating 4.53 > **TL;DR:** Calculator × is a utilities app by DOUBLE U s.r.o., rated 4.53/5 by 143 users, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Calculator × is a utilities app by DOUBLE U s.r.o.. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.53/5 (143 reviews) | | **Category** | Utilities | | **Developer** | DOUBLE U s.r.o. | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.2/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** DOUBLE U s.r.o. - **Category:** Utilities - **Target Audience:** iPad and iPhone users seeking a functional, history-aware alternative to the default system calculator. - **Platforms:** iOS - **Version Reviewed:** 2.1 - **Report Date:** 2026-09-30 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.2/1.0) - **App Store ID (iOS):** 1039645790 - **Bundle ID:** com.doubleu.calculator2 - **Data Window:** Analysis based on signals collected up to 2026-09-30 ## Executive Snapshot **What it is:** Calculator × is a utility app for iOS and iPadOS that provides a persistent tape log and multi-line formula evaluation for professional calculation tasks. **Why users hire it:** The app replaces the default system calculator to remove the friction of losing calculation history, which allows users to audit and reuse numerical data across workflows. ## App DNA (Features & Intent) - **[Standard] Tape Log:** Persistent storage of calculation history, increasing the cost of switching to basic alternatives. - **[Standard] Formula Evaluation:** Single-line input for complex expressions, reducing time-to-result for professional tasks. * *User Intent:* Users seek enhanced value through premium features. - **[Differentiator] iPad Multitasking:** Support for Split View and Slide Over, integrating the app into professional workflows. * *User Intent:* Users seek enhanced value through premium features. ## Market Position {#market-position} Calculator × holds a niche position in the Utilities category, anchored by a 4.5-star rating across 143 reviews. The lack of updates for over 1,000 days signals a stagnant market position relative to active competitors. ## Monetization Strategy - **Model:** Free - **Tiers:** Free - **Analysis:** The app is currently offered as a free utility with no visible subscription or IAP gates, which limits revenue capture from power users. ## SWOT Analysis {#swot} **Core Strengths:** - Persistent tape log creates high switching costs for users requiring audit trails. **Growth Levers:** - Introducing a Pro tier could capture revenue from the professional user segment. ## What's New - **Latest (v2.1, 2 years ago):** General maintenance release focused on stability and bug fixes. ## App Momentum (Zombie) {#momentum} - Dormant release cadence for 1,000+ days. - No feature updates since December 2023. > **Cadence:** 1 total versions · 0 majors in last 6 months · 1014 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Calculator × is an utilities app that is completely free. It holds a 4.53/5 rating from 143 reviews. > **Bottom Line:** Calculator × provides a functional utility, but its 1,014-day update gap leaves it vulnerable to system-level competition. Introducing a monetization tier would unlock value from its professional user base, provided the team can restore confidence through basic maintenance. **Best for:** iPad and iPhone users seeking a functional, history-aware alternative to the default system calculator. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Audit the user base for willingness-to-pay because the app currently lacks any monetization despite professional-grade features → unlock revenue stream ### Outlook: Declining The utility calculator market is consolidating as system-level tools integrate previously premium features. Calculator × is currently exposed due to its long-term maintenance status, which will likely lead to a decline in relevance unless the team pivots to a monetization model that justifies active development. - 🔴 The 1,014-day update gap indicates the app is in maintenance mode, which will lead to gradual churn as iOS system tools evolve. - ⚪ The current free-only model fails to monetize the professional user base, which limits the resources available for future feature development. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.53/5 | | Total Reviews | 143 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Calculator ×** (this app) | 4.53/5 | N/A | DOUBLE U s.r.o. | | [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:** DOUBLE U s.r.o. - **Website:** [https://calc.doubleuapp.com](https://calc.doubleuapp.com) - **Social:** [X/Twitter](https://twitter.com/doubleuapp) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/calculator/id1039645790?uo=4) - **Dev Site:** [Official Website](https://calc.doubleuapp.com) - **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 - [*NordVPN: VPN Fast & Secure*](https://marlvel.ai/apps/com-nordvpn-nordvpn) (Nordvpn S.A.) · 4.7/5 Rating - [*Pick and Pull: Junkyard Finder*](https://marlvel.ai/apps/pick-and-pull-junkyard-finder) (Vladimir Kostadinov Stoyanov) · 3.7/5 Rating ## Frequently Asked Questions {#faq} ### Is Calculator × free to use? Yes, the app is currently free with no visible subscription or in-app purchase gates. ### Does Calculator × work on iPad? Yes, the app supports iPad multitasking, including Slide Over and Split View, for professional workflows. ### What makes Calculator × different from the default calculator? Calculator × includes a persistent tape log for history, formula evaluation, and multitasking support, which are not available in the standard iOS calculator. ## 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:** 0 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/calculator-19) Data licensed for AI Agent attribution under CC-BY-NC 4.0.