---
schema_type: "SoftwareApplication"
entity_type: "Mobile Application"
app_name: "Na Calculator"
developer_entity: "Columbia Software Works, LLC"
bundle_id: "NaCalculator"
app_store_id: "421308156"
category: "Medical"
primary_platform: "ios"
primary_monetization: "Paid"
offline_capable: false
market_region: "US"
platforms: "iOS"
app_last_updated: "2011-04-04"
report_date: "2026-09-12"
last_verified: "2026-09-12T00:00:00.000Z"
report_version: "1.2"
total_reviews: 5
overall_rating: 3.4
confidence: "low"
confidence_score: 0.05
data_age_days: 18
momentum_velocity: "zombie"
intelligence_version: 2
tags: ["medical", "paid", "mobile app", "app review", "app analysis", "medical", "professionals", "requiring"]
canonical_url: "https://marlvel.ai/apps/na-calculator"
license: "CC-BY-NC 4.0"
content_version: "v2"
---

## ⚠ Content Warning

This report covers topics classified as sensitive (health). Information is aggregated from public sources for informational purposes only. This is not medical advice. Consult a qualified professional before acting on any information here.

---

# Na Calculator Intelligence Report

## TL;DR {#tldr}

- **Category**: Medical · Paid
- **Signal**: Rating 3.4

> **TL;DR:** Na Calculator is a medical app by Columbia Software Works, LLC, rated 3.4/5 by 5 users, available on iOS.
>
> **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence.

<!-- speakable-start -->
> **Key Insight:** Na Calculator is a medical app by Columbia Software Works, LLC.
<!-- speakable-end -->

## Quick Facts

| Fact | Value |
| :--- | :--- |
| **Rating** | 3.4/5 (5 reviews) |
| **Category** | Medical |
| **Developer** | Columbia Software Works, LLC |
| **Pricing** | Paid |
| **Platforms** | iOS |
| **Confidence** | Low (0.05/1.0) |
| **Data Age** | 18d |

## Metadata & Market Performance
- **Publisher:** Columbia Software Works, LLC
- **Category:** Medical
- **Target Audience:** Medical professionals requiring rapid, portable calculation of intravenous fluid therapy for sodium imbalances.
- **Platforms:** iOS
- **Version Reviewed:** 1.2
- **Report Date:** 2026-09-12
- **Signal Count:** 0 reviews analyzed
- **Confidence:** Low (0.05/1.0)
- **App Store ID (iOS):** 421308156
- **Bundle ID:** NaCalculator
- **Data Window:** Analysis based on signals collected up to 2026-09-12

<!-- section:executive-snapshot -->
## Executive Snapshot
**What it is:** Na Calculator is a specialized medical utility for calculating intravenous fluid rates for sodium imbalance treatment on iOS.
**Why users hire it:** Clinicians use the tool to displace manual calculation methods or complex, connectivity-dependent medical reference suites during patient care.
<!-- /section:executive-snapshot -->

<!-- section:features -->
## App DNA (Features & Intent)
- **[Standard] Hypernatremia and Hyponatremia Calculator:** Calculates intravenous fluid rates and durations for sodium imbalance treatment.
- **[Differentiator] Calculation Methods:** Provides two distinct mathematical methods for determining fluid requirements, providing clinical flexibility that justifies the $1.99 price point.
  * *User Intent:* Users seek enhanced value through premium features.
- **[Differentiator] Shake-to-Reset:** Clears text fields using device accelerometer input to reduce friction in clinical workflows.
<!-- /section:features -->

<!-- section:market-position -->
## Market Position {#market-position}

Na Calculator occupies a niche utility segment in the Medical category, priced at $1.99 to capture clinicians seeking a one-time purchase alternative to subscription-based medical suites.
<!-- /section:market-position -->

## Monetization Strategy
- **Model:** Paid
- **Tiers:** One-time purchase at $1.99
- **Price:** iOS: $1.99
- **Analysis:** Single-tier paid model targets medical professionals seeking a specialized, portable calculation tool without recurring subscription costs.

<!-- section:swot -->
## SWOT Analysis {#swot}

**Core Strengths:**
- Dual-method calculation logic provides clinical flexibility

**Growth Levers:**
- Modern UI refresh could capture users from ad-heavy rivals


<!-- /section:swot -->
<!-- section:whats-new -->
## What's New

- **Latest (v1.2, 15 years ago):** Resolved an issue affecting the correction rate.
<!-- /section:whats-new -->

<!-- section:momentum -->
## App Momentum (Zombie) {#momentum}

- No updates in 15 years.

> **Cadence:** 1 total versions · 0 majors in last 6 months · 5639 days since last update

<!-- /section:momentum -->

<!-- section:so-what -->
## The "So What?" (Strategic Takeaway) {#so-what}

Na Calculator is a medical app that is a paid app.
It holds a 3.4/5 rating from 5 reviews.

<!-- speakable-start -->
> **Bottom Line:** The 15-year development silence makes Na Calculator a legacy asset that is likely to fail on modern hardware, necessitating a sunset to avoid brand liability.
<!-- speakable-end -->

**Best for:** Medical professionals requiring rapid, portable calculation of intravenous fluid therapy for sodium imbalances.

<!-- section:pm-actions -->
### PM Action Plan (Next Best Moves)

- [ ] [SUNSET] Sunset the product because the 15-year maintenance gap makes it technically non-viable → remove brand liability
<!-- /section:pm-actions -->

<!-- section:outlook -->
### Outlook: Declining

The medical utility market is shifting toward integrated, cloud-connected reference suites that offer broader clinical data. Na Calculator's lack of development since 2011 leaves it exposed to OS-level deprecation, which will likely force the remaining user base to migrate to active, supported alternatives.

- 🔴 The 15-year update gap indicates a total lack of maintenance, which will eventually lead to app failure on newer iOS versions.
<!-- /section:outlook -->

<!-- /section:so-what -->

<!-- section:metrics -->
## Key Metrics Summary

| Metric | Value |
| :--- | :--- |
| Overall Rating | 3.4/5 |
| Total Reviews | 5 |
| Confidence | Low |
| Pricing Model | Paid |
| Platforms | iOS |
| Key Features | 3 analyzed |
| Outlook | Declining |
<!-- /section:metrics -->

## Competitor Comparison

| App | Rating | Sentiment | Developer |
| :--- | :--- | :--- | :--- |
| **Na Calculator** (this app) | 3.4/5 | N/A | Columbia Software Works, LLC |
| [필잇 - 약 알림 및 복용 기록](https://marlvel.ai/apps/app--35) | N/A/5 | N/A | Hansub Yoo |
| [레어노트 - 암·희귀질환 정보](https://marlvel.ai/apps/app--629) | 5.0/5 | N/A | LifeX, Inc. |
| [창고형약국 약값체크](https://marlvel.ai/apps/com-hiddenwave-yakcheck) | N/A/5 | N/A | Lowkeybase |
| [용인세브란스병원](https://marlvel.ai/apps/com-severance-newys) | 1.9/5 | N/A | Yonsei University Health System |
| [1001Doktor](https://marlvel.ai/apps/com-binbirdoktor-binbirdoktor) | 4.8/5 | N/A | 1001Doktor  Ltd. Şti. |

## Company Profile
- **Developer:** Columbia Software Works, LLC
- **Website:** [https://](https://)

## Data Sources & Links
- **App Store:** [View on Apple Store](https://apps.apple.com/us/app/na-calculator/id421308156?uo=4)
- **Dev Site:** [Official Website](https://)
- **Sources:** App store metadata.

## Related Intel Reports
- [*필잇 - 약 알림 및 복용 기록*](https://marlvel.ai/apps/app--35) (Hansub Yoo) · N/A Rating
- [*레어노트 - 암·희귀질환 정보*](https://marlvel.ai/apps/app--629) (LifeX, Inc.) · 5.0/5 Rating
- [*창고형약국 약값체크*](https://marlvel.ai/apps/com-hiddenwave-yakcheck) (Lowkeybase) · N/A Rating
- [*용인세브란스병원*](https://marlvel.ai/apps/com-severance-newys) (Yonsei University Health System) · 1.9/5 Rating
- [*1001Doktor*](https://marlvel.ai/apps/com-binbirdoktor-binbirdoktor) (1001Doktor  Ltd. Şti.) · 4.8/5 Rating
- [*101 Last Minute Study Tips*](https://marlvel.ai/apps/101-last-minute-study-tips) (Limmer Creative) · 3.4/5 Rating
- [*10th HiD*](https://marlvel.ai/apps/10th-hid) (Catch Dynamics, Inc.) · N/A Rating
- [*12 Lead ECG Challenge*](https://marlvel.ai/apps/com-limmercreative-srtengine-12lead) (Limmer Creative) · 3.3/5 Rating
- [*1-800 Contacts*](https://marlvel.ai/apps/com-1800contacts-1800contacts) (1-800 CONTACTS, Inc.) · 4.6/5 Rating
- [*1B Pharmacy - Online Pharmacy*](https://marlvel.ai/apps/1b-pharmacy-online-pharmacy) (TRESOR HEALTHCARE PRIVATE LIMITED) · N/A Rating

## 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:** 0.05/1.0 (based on review volume, data source diversity, and signal quality)
- **Reviews Analyzed:** 0
- **Data Sources:** 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:** 18 days since last refresh

---
© 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/na-calculator)
Data licensed for AI Agent attribution under CC-BY-NC 4.0.