---
schema_type: "SoftwareApplication"
entity_type: "Mobile Application"
app_name: "d20 Calculator"
developer_entity: "Lion's Den"
bundle_id: "com.lionsden.d20calculator"
app_store_id: "817035968"
category: "Productivity"
primary_platform: "ios"
primary_monetization: "Free"
offline_capable: false
market_region: "US"
platforms: "iOS"
app_last_updated: "2020-02-21"
report_date: "2026-05-14"
last_verified: "2026-05-14T01:34:34.506Z"
report_version: "2.12"
total_reviews: 341
overall_rating: 4.67
sentiment: "Excited"
sentiment_score: 85
confidence: "high"
confidence_score: 0.45
top_praise_theme: "Flexibility of custom dice engine"
review_sample_size: 49
data_age_days: 3
momentum_velocity: "zombie"
intelligence_version: 3
competitor_count: 6
tags: ["productivity", "free", "excited sentiment", "mobile app", "app review", "app analysis", "tabletop", "roleplaying", "players"]
canonical_url: "https://marlvel.ai/intel-report/productivity/d20-calculator"
license: "CC-BY-NC 4.0"
content_version: "v2"
---

# d20 Calculator App Audit

## TL;DR {#tldr}

- **Category**: Productivity · Free
- **Signal**: Rating 4.67 · Sentiment Excited
- **Recent focus**: Flexibility of custom dice engine (top praise)

> **TL;DR:** d20 Calculator is a productivity app by Lion's Den, rated 4.67/5 by 341 users, with Excited user sentiment (85/100), available on iOS.
>
> **Marlvel.ai App Intelligence** — Independent analysis. US Market. No publisher influence.

<!-- speakable-start -->
> **Key Insight:** d20 Calculator maintains Excited user sentiment (4.67/5 from 341 reviews), with users consistently praising flexibility of custom dice engine.
<!-- speakable-end -->

## Quick Facts

| Fact | Value |
| :--- | :--- |
| **Rating** | 4.67/5 (341 reviews) |
| **User Mood** | Excited |
| **Category** | Productivity |
| **Developer** | Lion's Den |
| **Pricing** | Free |
| **Platforms** | iOS |
| **Confidence** | High (0.45/1.0) |
| **Data Age** | 0d |

## Metadata & Market Performance
- **Publisher:** Lion's Den
- **Category:** Productivity
- **Target Audience:** Tabletop roleplaying game players who require a flexible, digital tool for complex dice calculations.
- **Platforms:** iOS
- **Version Audited:** 2.12
- **Audit Date:** 2026-05-14
- **Signal Count:** 49 reviews analyzed
- **Confidence:** High (0.45/1.0)
- **App Store ID (iOS):** 817035968
- **Bundle ID:** com.lionsden.d20calculator
- **Performance Trend:** Declining
- **Data Window:** Analysis based on signals collected up to 2026-05-14

<!-- section:executive-snapshot -->
## Executive Snapshot
**What it is:** d20 Calculator is a productivity tool for tabletop RPG players to perform complex dice combinations and save roll presets on iOS.
**Why users hire it:** Users hire this app to automate complex dice math during tabletop sessions, removing the manual effort of calculating results for multi-die attacks.
<!-- /section:executive-snapshot -->

<!-- section:features -->
## App DNA (Features & Intent)
- **[Standard] Custom Dice Calculator:** Calculates complex dice combinations including addition, subtraction, multiplication, and division of any die type.
  * *User Intent:* Users value self-expression and personalized experiences.
- **[Standard] Saved Roll Presets:** Allows users to save frequently used dice rolls with custom labels for specific attacks.
  * *User Intent:* Users value self-expression and personalized experiences.
- **[Differentiator] Customizable Dice (dx):** Enables rolling non-standard dice sizes like d7 or d100.
  * *User Intent:* Users value self-expression and personalized experiences.
<!-- /section:features -->

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

The app maintains a 4.67 rating across 341 ratings, signaling high satisfaction with the core calculation engine despite no updates since early 2020.
<!-- /section:market-position -->

## Monetization Strategy
- **Model:** Free
- **Tiers:** Free
- **Analysis:** The app operates on a free model with no visible IAP or subscription gates.

<!-- section:sentiment -->
## 🟢 User Sentiment (High Confidence: 341 reviews) {#user-sentiment}
- **Overall Rating:** 4.67/5
- **Platform Split:** iOS 4.7/5 (341 ratings)
- **Overall Sentiment:** Excited

### Top Praises
- **Flexibility of custom dice engine**

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

**Core Strengths:**
- High 4.67 rating sustains organic install velocity
- Flexible calculation engine addresses complex RPG math

**Critical Frictions:**
- No feature updates since 2020
- Lacks integrated game-state tracking

**Growth Levers:**
- Integration of game timers for session management
- Adding visual analytics for performance trends

**Market Threats:**
- Competitors with active 2-week update cadences
- Integrated game-state tools rendering static calculators obsolete

<!-- /section:swot -->
## Recent Changes (v2 → v3) {#recent-changes}

The app's competitive positioning has shifted from a focus on internal technical stability to an external threat assessment regarding the lack of integrated game-management features.

**Overall trend**: Declining
**Compared at**: 2026-05-14

### High-impact changes
- **[Shifted] Competitive Landscape Re-alignment** (positioning) — The competitive set was entirely replaced to focus on tabletop management tools (ScorePal, Skorer) rather than standalone dice calculators.
- **[Declined] Outlook Trend Downgrade** (positioning) — Outlook trend moved from mixed to declining due to the six-year development stagnation.

### Medium-impact changes
- **[Shifted] Strategic Threat Assessment** (swot) — Threats shifted from specific competitor update cadences to the broader risk of integrated game-state tools rendering static calculators obsolete.
- **[Added] New Strategic Opportunities** (swot) — Opportunities added for session management and visual analytics to counter feature-rich rivals.

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

- **Latest (v2.12, 6 years ago):** Enabled portrait mode support for iPad and resolved UI sizing issues.
<!-- /section:whats-new -->

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

- No feature updates since 2020.

> **Cadence:** 1 total versions · 0 majors in last 6 months · 2273 days since last update

<!-- /section:momentum -->

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

d20 Calculator is a market-leading productivity app that is completely free.
With a 4.67/5 rating from 341 reviews, it delivers strong user satisfaction.

<!-- speakable-start -->
> **Bottom Line:** d20 Calculator holds a strong baseline rating, but the lack of updates since 2020 leaves it vulnerable to rivals with integrated game-state tools, so the PM should prioritize adding session-management features to defend against churn.
<!-- speakable-end -->

**Best for:** Tabletop roleplaying game players who require a flexible, digital tool for complex dice calculations.

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

- [ ] [INVEST] [MEDIUM IMPACT] Audit competitive feature set because rivals like ScorePal offer game timers → retain utility-seeking users — *Competitors are adding session-management tools that directly address the broader tabletop workflow.* _(trade-off: deprioritize Pause the UI theme expansion — functional utility has higher retention impact than visual variety.)_
<!-- /section:pm-actions -->

<!-- section:feature-gaps -->
### Feature Gaps vs Competitors

- Integrated game timer (available in ScorePal)
- Visual score graph analytics (available in ScorePal)
- Integrated game notes (available in Skorer)
<!-- /section:feature-gaps -->

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

The tabletop utility market is consolidating around apps that provide integrated game-state tracking, leaving static calculators like d20 Calculator exposed. The PM must transition from maintenance to active development to prevent further erosion of the user base to feature-rich rivals.

- 🔴 The lack of updates since 2020 signals a shift to maintenance mode, which invites competitors to capture the active user base.
<!-- /section:outlook -->

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

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

| Metric | Value |
| :--- | :--- |
| Overall Rating | 4.67/5 |
| Total Reviews | 341 |
| Sentiment | Excited (85/100) |
| Confidence | High |
| Pricing Model | Free |
| Platforms | iOS |
| Key Features | 3 analyzed |
| Trend | Declining |
| Outlook | Declining |
<!-- /section:metrics -->

## Competitor Comparison

| App | Rating | Sentiment | Developer |
| :--- | :--- | :--- | :--- |
| **d20 Calculator** (this app) | 4.67/5 | Excited | Lion's Den |
| [My Board Game Collection](https://marlvel.ai/intel-report/utilities/my-board-game-collection) | 4.4/5 | N/A | Tommy Uytterhaegen |
| [Dice Roller!](https://marlvel.ai/intel-report/utilities/dice-roller-1) | 4.6/5 | Excited | Harry Foster |
| [Reef Tank Guides](https://marlvel.ai/intel-report/productivity/reef-tank-guides) | N/A/5 | N/A | Wontae Lee |
| [Skorer - Your Score Tracker](https://marlvel.ai/intel-report/utilities/skorer-your-score-tracker) | 4.7/5 | Excited | Touseef Hassan Nasir |
| [ScorePal](https://marlvel.ai/intel-report/games/scorepal) | 4.3/5 | N/A | Pace Apps Inc. |

## Company Profile
- **Developer:** Lion's Den

## Data Sources & Links
- **App Store:** [View on Apple Store](https://apps.apple.com/us/app/d20-calculator/id817035968?uo=4)
- **Sources:** App store metadata, User reviews.

## Related Intel Reports
- [*My Board Game Collection*](https://marlvel.ai/intel-report/utilities/my-board-game-collection) (Tommy Uytterhaegen) — 4.4/5 Rating | N/A Sentiment
- [*Dice Roller!*](https://marlvel.ai/intel-report/utilities/dice-roller-1) (Harry Foster) — 4.6/5 Rating | Positive Sentiment
- [*Reef Tank Guides*](https://marlvel.ai/intel-report/productivity/reef-tank-guides) (Wontae Lee) — N/A Rating | N/A Sentiment
- [*Skorer - Your Score Tracker*](https://marlvel.ai/intel-report/utilities/skorer-your-score-tracker) (Touseef Hassan Nasir) — 4.7/5 Rating | Positive Sentiment
- [*ScorePal*](https://marlvel.ai/intel-report/games/scorepal) (Pace Apps Inc.) — 4.3/5 Rating | N/A Sentiment
- [*GameTally: Simple Score Keeper*](https://marlvel.ai/intel-report/entertainment/gametally-simple-score-keeper) (Fabien Maurice) — N/A Rating | N/A Sentiment
- [*Mitsu: AI Life Coach*](https://marlvel.ai/intel-report/productivity/mitsu-ai-life-coach) (C2 Insights) — N/A Rating | N/A Sentiment
- [*Pattrn - Discipline Tracker*](https://marlvel.ai/intel-report/productivity/pattrn-discipline-tracker) (Pedro Schott) — 4.8/5 Rating | Positive Sentiment
- [*ChatGPT*](https://marlvel.ai/intel-report/productivity/chatgpt) (OpenAI OpCo, LLC) — 4.8/5 Rating | Negative Sentiment
- [*Whats In The Box*](https://marlvel.ai/intel-report/productivity/com-asp-whatsinthebox) (Arron Penfold) — N/A Rating | N/A 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:** 0.45/1.0 (based on review volume, data source diversity, and signal quality)
- **Reviews Analyzed:** 49
- **Data Sources:** user reviews, 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/productivity/d20-calculator)
Data licensed for AI Agent attribution under CC-BY-NC 4.0.