--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Calculator 42 with History PRO" developer_entity: "Nikolay Donets" bundle_id: "org.donets.calc" app_store_id: "1525901717" category: "Productivity" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2022-05-29" report_date: "2026-08-20" last_verified: "2026-08-20T00:00:00.000Z" report_version: "1.2.28" total_reviews: 74 overall_rating: 4.6 confidence: "low" confidence_score: 0.15 data_age_days: 41 momentum_velocity: "zombie" intelligence_version: 3 tags: ["productivity", "freemium", "mobile app", "app review", "app analysis", "students", "professionals", "requiring"] canonical_url: "https://marlvel.ai/apps/calculator-42-with-history-pro" license: "CC-BY-NC 4.0" content_version: "v2" --- # Calculator 42 with History PRO Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Freemium - **Signal**: Rating 4.61 > **TL;DR:** Calculator 42 with History PRO is a productivity app by Nikolay Donets, rated 4.61/5 by 74 users, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Calculator 42 with History PRO is a productivity app by Nikolay Donets. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.61/5 (74 reviews) | | **Category** | Productivity | | **Developer** | Nikolay Donets | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Low (0.15/1.0) | | **Data Age** | 41d | ## Metadata & Market Performance - **Publisher:** Nikolay Donets - **Category:** Productivity - **Target Audience:** Students and professionals requiring a persistent log of mathematical calculations for reference or reuse. - **Platforms:** iOS - **Version Reviewed:** 1.2.28 - **Report Date:** 2026-08-20 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.15/1.0) - **App Store ID (iOS):** 1525901717 - **Bundle ID:** org.donets.calc - **Performance Trend:** Stable - **Data Window:** Analysis based on signals collected up to 2026-08-20 ## Executive Snapshot **What it is:** Calculator 42 is a productivity utility for iOS that provides a persistent calculation history log for students and professionals. **Why users hire it:** It removes the friction of re-entering multi-step expressions by saving every calculation in a searchable, reusable journal. ## App DNA (Features & Intent) - **[Standard] Calculation History Log:** Saves all past expressions and results in a journal for reuse or copying. - **[Differentiator] Context Menu Interaction:** Long-press on history items to trigger a menu for copying, deleting, or re-using data. ## Market Position {#market-position} Calculator 42 maintains a 4.6-star rating across 74 reviews, though the lack of updates since May 2022 limits its competitive standing in the productivity category. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free version with all features, PRO plan with yearly billing - **Analysis:** The app offers full feature access for free, with a PRO plan available via in-app purchase. ## SWOT Analysis {#swot} **Core Strengths:** - Persistent journal enables multi-step workflow reuse - Context menu interaction allows granular history management **Growth Levers:** - Implement cloud-sync for history logs ## Recent Changes (v2 → v3) {#recent-changes} The competitive outlook for Calculator 42 shifted from declining to stable, as the analysis now frames the app as a niche, static utility rather than a failing growth-focused product. This pivot acknowledges the app's long-term maintenance state while refining the threat landscape to focus on OS-native competition. **Overall trend**: Stable **Compared at**: 2026-08-20 ### Medium-impact changes - **[Shifted] Outlook Trend Adjustment** (positioning) - **[Shifted] Threat Landscape Refinement** (swot) ## What's New - **Latest (v1.2.28, 4 years ago):** Version 1.2.28 focuses exclusively on general bug fixes and performance optimizations. ## App Momentum (Zombie) {#momentum} - Dormant development for four years. - Last major release May 2022. > **Cadence:** 1 total versions · 0 majors in last 6 months · 1543 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Calculator 42 with History PRO is a productivity app that is free with in-app purchases. It holds a 4.61/5 rating from 74 reviews. > **Bottom Line:** Calculator 42 serves as a stable utility for users needing persistent logs, but the four-year development gap makes it a legacy asset that requires a maintenance audit to ensure continued platform compatibility. **Best for:** Students and professionals requiring a persistent log of mathematical calculations for reference or reuse. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Audit codebase for iOS compatibility because the app has not been updated since May 2022 → maintain platform stability ### Outlook: Stable The productivity calculator market is consolidating around OS-integrated tools, leaving standalone apps like Calculator 42 in a niche position. Without a clear update cadence, the app remains exposed to platform-level changes that could break its core functionality. - ⚪ The four-year development gap suggests a maintenance-only posture, which limits the potential for new user acquisition in a crowded category. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.61/5 | | Total Reviews | 74 | | Confidence | Low | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 2 analyzed | | Trend | Stable | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Calculator 42 with History PRO** (this app) | 4.61/5 | N/A | Nikolay Donets | | [Mitsu: AI Life Coach](https://marlvel.ai/apps/mitsu-ai-life-coach) | N/A/5 | N/A | C2 Insights | | [ChatGPT](https://marlvel.ai/apps/chatgpt) | 4.8/5 | n/a | OpenAI OpCo, LLC | | [HitWave](https://marlvel.ai/apps/ciendor-applications-hitwave) | 2.6/5 | Mixed | Ciendor Holdings Corp. LTD | | [Paper: Sketch, Draw & Create](https://marlvel.ai/apps/paper-sketch-draw-create) | 4.6/5 | N/A | Evernote Corporation | | [Pattrn - Discipline Tracker](https://marlvel.ai/apps/pattrn-discipline-tracker) | 4.8/5 | Thrilled | Pedro Schott | ## Company Profile - **Developer:** Nikolay Donets - **Website:** [https://donets.org](https://donets.org) - **Social:** [YouTube](https://youtu.be/ueSn7zTDDWY) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/calculator-42-with-history-pro/id1525901717?uo=4) - **Dev Site:** [Official Website](https://donets.org) - **Sources:** Developer website content, App store metadata. ## Related Intel Reports - [*Mitsu: AI Life Coach*](https://marlvel.ai/apps/mitsu-ai-life-coach) (C2 Insights) · N/A Rating - [*ChatGPT*](https://marlvel.ai/apps/chatgpt) (OpenAI OpCo, LLC) · 4.8/5 Rating - [*HitWave*](https://marlvel.ai/apps/ciendor-applications-hitwave) (Ciendor Holdings Corp. LTD) · 2.6/5 Rating - [*Paper: Sketch, Draw & Create*](https://marlvel.ai/apps/paper-sketch-draw-create) (Evernote Corporation) · 4.6/5 Rating - [*Pattrn - Discipline Tracker*](https://marlvel.ai/apps/pattrn-discipline-tracker) (Pedro Schott) · 4.8/5 Rating | Excellent Sentiment - [*SpaceDesk App*](https://marlvel.ai/apps/spacedesk-app) (Hawsabah) · N/A Rating - [*한음달-한국인에게 꼭 맞는 음력달력, 캘린더*](https://marlvel.ai/apps/app--103) (YunaSoft Inc.) · 4.6/5 Rating - [*바로메모 - 매일 바로 작성하는 메모장*](https://marlvel.ai/apps/cswpd-memo) (SuWon Choi) · N/A Rating - [*근로장려금 알리미 - 신청, 기준, 금액계산 가이드*](https://marlvel.ai/apps/com-swing2app-v3-d83e9bb95c05347f59ad81dea3b925ebf) (SY Company) · 3.8/5 Rating - [*통화관리솔루션 (부평구청용)*](https://marlvel.ai/apps/byto-bupyeong) (BYTO) · N/A Rating ## Frequently Asked Questions {#faq} ### Is Calculator 42 free to use? Yes, Calculator 42 is free and provides access to all calculation features without intrusive advertising or subscription requirements, though a PRO plan is available. ### Does Calculator 42 save my past calculations? Yes, Calculator 42 includes a calculation history log that saves expressions and results for later reuse or copying. ### Is Calculator 42 still being updated? No, the app has not received a major update since May 2022, indicating that it is currently in a maintenance-only state. ## 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:** 0.15/1.0 (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:** 41 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/calculator-42-with-history-pro) Data licensed for AI Agent attribution under CC-BY-NC 4.0.