--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Interp Calculator" developer_entity: "Stanislav Soroka" bundle_id: "com.ssdevelop.interpolationCalculator" app_store_id: "6747821560" google_play_id: "com.google.android.calculator" category: "Utilities" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: true market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-03-23" report_date: "2026-05-05" report_version: "1.0" total_reviews: 764564 overall_rating: 4.35 sentiment: "Mixed" sentiment_score: 45 confidence: "high" confidence_score: 0.8 top_praise_theme: "Core calculator functionality provides reliable utility for daily arithmetic and store shopping tasks" top_complaint_theme: "Post-update UI changes removed the running total display and quick answer functionality" top_request_theme: "Integration of financial conversion tools like currency converters into the primary interface" review_sample_size: 50 total_review_count: 50 analyzed_review_count: 50 data_age_days: 57 momentum_velocity: "maintenance" intelligence_version: 3 nemesis: "Calculator #" competitor_count: 7 tags: ["utilities", "freemium", "mixed sentiment", "mobile app", "app review", "app analysis", "students,", "engineers,", "technicians,"] canonical_url: "https://marlvel.ai/intel-report/utilities/interp-calculator" license: "CC-BY-NC 4.0" content_version: "v2" last_verified: "2026-05-05T19:41:26.252Z" --- # Interp Calculator App Audit ## TL;DR {#tldr} - **Category**: Utilities · Freemium - **Signal**: Rating 4.35 · Sentiment Mixed - **Recent focus**: Post-update UI changes removed the running total display and quick answer functionality (top complaint) · Core calculator functionality provides reliable utility for daily arithmetic and store shopping tasks (top praise) · Integration of financial conversion tools like currency converters into the primary interface (top request) > **TL;DR:** Interp Calculator is a utilities app by Stanislav Soroka, rated 4.35/5 by 764.6K users, with Mixed user sentiment (45/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence. > **Key Insight:** Interp Calculator shows Mixed sentiment (4.35/5 from 764.6K reviews) — users praise core calculator functionality provides reliable utility for daily arithmetic and store shopping tasks but report issues with post-update ui changes removed the running total display and quick answer functionality. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.35/5 (764.6K reviews) | | **User Mood** | Mixed | | **Category** | Utilities | | **Developer** | Stanislav Soroka | | **Pricing** | Freemium | | **Platforms** | iOS & Android | | **Confidence** | High (0.8/1.0) | | **Data Age** | 0d | ## Metadata & Market Performance - **Publisher:** Stanislav Soroka - **Category:** Utilities - **Target Audience:** Students, engineers, technicians, and maritime professionals who require accurate, offline numerical analysis tools. - **Platforms:** iOS & Android - **Version Audited:** 1.0 - **Audit Date:** 2026-05-05 - **Signal Count:** 50 reviews analyzed - **Confidence:** High (0.8/1.0) - **App Store ID (iOS):** 6747821560 - **Bundle ID:** com.ssdevelop.interpolationCalculator - **Google Play ID:** com.google.android.calculator - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-05-05 - **Short Description:** A simple calculator utility for Android ## Executive Snapshot **What it is:** Interp Calculator is a utility tool for linear and bilinear interpolation, designed for students and technical professionals on iOS and Android. **Why users hire it:** Users hire this app to perform specialized numerical analysis in offline environments where general-purpose calculators lack the necessary grid-based computation logic. ## App DNA (Features & Intent) - **[Standard] Linear Interpolation:** Calculates intermediate values between two known data points for tabular data analysis. - **[Differentiator] Bilinear Interpolation:** Computes values based on four surrounding points in a two-dimensional grid. - **[Differentiator] Offline Functionality:** Performs all calculations locally without requiring an internet connection. * *User Intent:* Users want uninterrupted access without internet dependency. ## Market Position {#market-position} The app maintains a 4.35 rating on Android with over 760,000 ratings, but the recent update's UI regressions threaten this established base against high-velocity competitors. ## Monetization Strategy - **Model:** Freemium - **Tiers:** iOS version priced at $0.99, Android version available for free - **Price:** iOS: $0.99 - **Analysis:** Monetization is split by platform, with a $0.99 one-time purchase on iOS and a free distribution model on Android. ## 🟡 User Sentiment (High Confidence: 50 of 50 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.35/5 - **Platform Split:** Android 4.4/5 (764.6K ratings) - **Overall Sentiment:** Mixed ### Top Praises - **Core calculator functionality provides reliable utility for daily arithmetic and store shopping tasks** ### Top Complaints (Impact Areas) - **Post-update UI changes removed the running total display and quick answer functionality** - **Visual regressions including oversized UI elements and flashing cursors disrupt the calculation flow** ### Top Requests (What Users Want) - **Integration of financial conversion tools like currency converters into the primary interface** ## SWOT Analysis {#swot} **Core Strengths:** - Offline-first architecture functions as a switching-cost barrier for maritime professionals - Specialized bilinear interpolation serves as a technical differentiator **Critical Frictions:** - 0.7★ Android-iOS rating gap on majority Android base - Removal of running total feature in the latest update - UI scaling issues on Android **Growth Levers:** - Home screen widget integration for faster access - Financial conversion tool expansion for broader utility **Market Threats:** - High-frequency update cadence of Calculator # - UI regressions causing app deletion - General-purpose calculators adding interpolation as a standard feature ## Recent Changes (v2 → v3) {#recent-changes} The app transitioned to a freemium pricing model and experienced a sentiment decline following UI regressions that removed core utility features. **Overall trend**: Declining **Compared at**: 2026-05-05 ### High-impact changes - **[Shifted] Freemium Pricing Model** (pricing) — Pricing model shifted from free to freemium, with a $0.99 one-time purchase on iOS and free access on Android. - **[Declined] UI Regression Complaints** (sentiment) — New complaints emerged regarding the removal of the subtotal display and quick answer functionality, alongside reports of oversized UI elements. - **[Improved] Feature Positioning Upgrade** (features) — Bilinear Interpolation and Offline Functionality were reclassified from 'standard' to 'differentiator' status. ### Medium-impact changes - **[Shifted] Audience Expansion** (audience) — Target audience expanded to include maritime professionals in addition to students and engineers. - **[Added] New SWOT Weaknesses and Threats** (swot) — Added weaknesses regarding the Android-iOS rating gap and UI scaling issues, and threats regarding UI-regression-driven churn. ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Interp Calculator vs Calculator # — Head to Head - **[Calculator #](https://marlvel.ai/intel-report/utilities/calculator-1)** by Incpt.Mobis: This app shares the same utility-focused distribution model and massive scale, serving as the primary benchmark for general-purpose calculation tools. - **Moat strength:** Medium — durable but contestable - **Key differences:** - Maintains a high-frequency update cadence to ensure compatibility with the latest Android OS versions. - Leverages a massive, established user base to dominate search visibility within the Utilities category. - Provides a standardized, no-frills interface that prioritizes speed over complex numerical analysis features. - **Where Interp Calculator wins:** - ✅ Offers specialized linear and bilinear interpolation tools that general-purpose calculators lack for engineering students. - ✅ Targets a specific technical niche rather than the broad, undifferentiated mass-market utility audience. - **Where Calculator # wins:** - ❌ Benefits from significant network effects and search ranking dominance due to its massive install base. - ❌ Provides a highly stable, battle-tested interface that minimizes user friction for basic arithmetic tasks. - **Verdict:** The target app should defend its niche by emphasizing its specialized interpolation capabilities, as it cannot compete with the nemesis on general-purpose utility scale. ### Contenders (Strong Challengers) - **[Calculator₊](https://marlvel.ai/intel-report/utilities/com-itwcalculator-calculatorforipadfree)** by Impala Studios [Moat: High]: A high-velocity competitor with significant market penetration and frequent feature updates. - Aggressive release schedule with nine updates in six months indicates a highly active development pipeline. - Optimized for tablet-first experiences, capturing a segment of the market that requires larger screen real estate. - **[Calculator!](https://marlvel.ai/intel-report/utilities/com-7thg-calculator)** by 7th Gear [Moat: Medium]: A long-standing utility app that maintains a massive footprint in the same category. - Focuses on extreme simplicity and minimal UI overhead to reduce cognitive load for casual users. - Established brand presence acts as a barrier to entry for new, specialized utility tools. ### Peers (What They Do Better) - **[Graphing Calculator X84](https://marlvel.ai/intel-report/education/graphing-calculator-x84)** by Incpt.Mobis: Targets the same academic and engineering audience but focuses on graphing rather than interpolation. - Provides advanced visual graphing capabilities that serve as a natural upgrade path for engineering students. - Positions itself as a comprehensive academic tool rather than a single-function utility. - **[Scientific Calculator](https://marlvel.ai/intel-report/tools/scientific-calculator)** by Philip Stephens: Adjacent tool that competes for the same technical user base in the Tools category. - Includes a broader suite of scientific functions that may overlap with interpolation needs. - Maintains a high update frequency to keep pace with evolving mobile hardware standards. - **[Calculator‰](https://marlvel.ai/intel-report/utilities/calculator-4)** by Tim O's Studios, LLC: A direct category peer that competes for the same general utility search intent. - Utilizes a generic utility branding strategy to capture broad, non-specific search traffic. - Offers a standard feature set that prioritizes broad compatibility over specialized mathematical functions. ### New Kids on the Block (What's Innovative) - **[Scientific Calculator](https://marlvel.ai/intel-report/tools/scientific-calculator-1)** by MoseratumApps: High-velocity development and recent entry suggest an attempt to capture niche technical users. ## What's New - **Latest (v9.1 (886477075), 1 months ago):** Updated UI to Material 3 Expressive design. ## App Momentum (Maintenance) {#momentum} - Ships frequent UI-focused updates. - Maintains specialized interpolation niche. > **Cadence:** 2 total versions · 1 majors in last 6 months · 43 days since last update · 269 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Interp Calculator is an established utilities app that is free with in-app purchases. With a 4.35/5 rating from 764.6K reviews, it shows polarized user reception. > **Bottom Line:** Interp Calculator retains a technical user base through specialized interpolation tools, but the latest update's UI regressions threaten retention, so the PM must prioritize restoring core utility features to stabilize the Android rating. **Best for:** Students, engineers, technicians, and maritime professionals who require accurate, offline numerical analysis tools. ### PM Action Plan (Next Best Moves) - [ ] [PIVOT] [HIGH IMPACT] Restore subtotal display because it is the top-cited complaint → stabilize Android rating — *Users report frustration over the removal of the subtotal feature during input* _(trade-off: deprioritize Pause the financial conversion tool sprint — subtotal restoration has higher retention impact.)_ - [ ] [MAINTAIN] [MEDIUM IMPACT] Audit UI scaling on Android because oversized elements cause screen cutoff → reduce churn — *The interface appears too large and gets cut off by screen boundaries* _(trade-off: deprioritize Same-quarter capacity available — no major lever displaced.)_ ### Feature Gaps vs Competitors - Financial conversion tools (available in stock calculators but missing here) - Memory functions M+/MRC (available in Calculator! but missing here) - Home screen widgets (available in Calculator₊ but missing here) ### Outlook: Declining The utility calculator market is consolidating around high-frequency update cadences, leaving Interp Calculator exposed to churn if it continues to prioritize UI changes over core functionality. The recent sentiment decline indicates that professional users prioritize calculation efficiency over visual updates, so the PM must pivot to stability to prevent further erosion of the Android install base. - 🔴 UI regressions in the latest update (oversized elements, missing subtotal) erode the daily active habit, which compounds the rating drag visible on Android. - ⚪ Recent updates focused on UI changes rather than feature expansion, leaving the app vulnerable to competitors with higher update cadences. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.35/5 | | Total Reviews | 764.6K | | Sentiment | Mixed (45/100) | | Confidence | High | | Pricing Model | Freemium | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Trend | Declining | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Interp Calculator** (this app) | 4.35/5 | Mixed | Stanislav Soroka | | [Calculator₊](https://marlvel.ai/intel-report/utilities/com-itwcalculator-calculatorforipadfree) | 4.7/5 | Mixed | Impala Studios | | [Calculator!](https://marlvel.ai/intel-report/utilities/com-7thg-calculator) | 4.8/5 | N/A | 7th Gear | | [Calculator #](https://marlvel.ai/intel-report/utilities/calculator-1) | 4.6/5 | N/A | Incpt.Mobis | | [Graphing Calculator X84](https://marlvel.ai/intel-report/education/graphing-calculator-x84) | 4.5/5 | N/A | Incpt.Mobis | | [Calculator‰](https://marlvel.ai/intel-report/utilities/calculator-4) | 4.9/5 | N/A | Tim O's Studios, LLC | ## Company Profile - **Developer:** Stanislav Soroka - **Website:** [https://msdmarine.com/en/pages/contact/](https://msdmarine.com/en/pages/contact/) - **Social:** [Instagram](https://www.instagram.com/marinesurveypro) · [YouTube](https://www.youtube.com/channel/UCxbrD9YSViTUz9YueUjyavw) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/interp-calculator/id6747821560?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.google.android.calculator&hl=en&gl=us) - **Dev Site:** [Official Website](https://msdmarine.com/en/pages/contact/) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*Calculator₊*](https://marlvel.ai/intel-report/utilities/com-itwcalculator-calculatorforipadfree) (Impala Studios) — 4.7/5 Rating | Mixed Sentiment - [*Calculator!*](https://marlvel.ai/intel-report/utilities/com-7thg-calculator) (7th Gear) — 4.8/5 Rating | N/A Sentiment - [*Calculator #*](https://marlvel.ai/intel-report/utilities/calculator-1) (Incpt.Mobis) — 4.6/5 Rating | N/A Sentiment - [*Graphing Calculator X84*](https://marlvel.ai/intel-report/education/graphing-calculator-x84) (Incpt.Mobis) — 4.5/5 Rating | N/A Sentiment - [*Calculator‰*](https://marlvel.ai/intel-report/utilities/calculator-4) (Tim O's Studios, LLC) — 4.9/5 Rating | N/A Sentiment - [*Scientific Calculator*](https://marlvel.ai/intel-report/tools/scientific-calculator) (Philip Stephens) — 4.5/5 Rating | N/A Sentiment - [*Scientific Calculator*](https://marlvel.ai/intel-report/tools/scientific-calculator-1) (MoseratumApps) — 4.5/5 Rating | N/A Sentiment - [*Potatso*](https://marlvel.ai/intel-report/utilities/potatso) (Potatso Lab LTD) — 4.4/5 Rating | Negative Sentiment - [*V2Box - V2ray Client*](https://marlvel.ai/intel-report/utilities/v2box-v2ray-client) (techlaim) — 4.5/5 Rating | Mixed Sentiment - [*Free VPN by Free VPN .org™*](https://marlvel.ai/intel-report/utilities/free-vpn-by-free-vpn-org) (Free VPN LLC) — 4.3/5 Rating | Mixed Sentiment ## 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 and evidence quoting. 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:** 0.8/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 50 - **Data Sources:** user reviews, developer website, company about page, 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/intel-report/utilities/interp-calculator) Data licensed for AI Agent attribution under CC-BY-NC 4.0.