Comparison

Calcu vs Muster Army Builder

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Calcu

This unofficial player aid assists with hit calculations for robot battle games. Easily input values, sum categories, and calculate hit probability based on dice rolls. Customize your experience with multiple color options.

Highlights
  • Input values for categories and robots
  • Sum all category values
  • Calculate hit probability
  • 2d6 dice roll simulation
  • Multiple color themes
Read full description

This is an unofficial player aid to help facilitate hit calculations for players interested in robot battles. It's a fun way to engage and plan out attacks on the tabletop Key Features - Ability to input values easily for each category or GATOR - Provide a total number of all categories - Calculate the hit probability based on the 2d6 dice roll - Multiple colors to choose from! -Cluster and Hit Location reference tables

About

Muster Army Builder

Features
Read full description

Muster is a fast army-list builder for miniature tabletop wargames. Muster ships empty and imports the community-maintained datasets you already use, so your unit and rules data always comes from your own source — not from us. • Build legal lists — add units, set a points limit, and watch a live budget as you go. • Detachments & enhancements — pick detachments and enhancements with automatic points/slot enforcement. • Import your data — load community dataset files at runtime; nothing is bundled. • Dice roller — D3/D6/D12/D20 with history, for quick in-game rolls. • Collection tracker — record which miniatures you own and their paint status. • Campaign tracker — track your force across a narrative campaign with rank and experience progression. • AI list coaching (Pro) — a read on your list's strengths, weaknesses and swaps, or a plan for a specific opponent. • No account, no sign-up — your lists stay on your device. Muster needs a connection twice: once to download a dataset, and again if you use the AI features, which send only your list text for analysis. Everything else works offline. Muster Pro is a one-time purchase, not a subscription. It unlocks unlimited army lists (free covers one), Rate My List, matchup analysis, and all future Pro features. Not affiliated with, licensed by, or endorsed by any game publisher. For use with your own rulebooks and community data.

Screenshots

Calcu3 screens
Muster Army Builder4 screens

Verdict

The call

The clearest difference is in-app purchases: Calcu at none against Muster Army Builder's 1. Calcu also leads on iOS requirement (13.0 vs 18.0). Muster Army Builder's advantage is update cadence (every 3 days vs every 6 weeks). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Muster Army Builder sells 1 one-off in-app purchase. Calcu asks for nothing beyond the download.

UpkeepUpdate frequency

Calcu ships an update every 6 weeks, Muster Army Builder every 3 days. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 7 level
Calcu versus Muster Army Builder: the parameters behind the verdict, then further details
ParameterCalcuMuster Army Builder
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 6 weeksEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad
Requires iOS13.0 — better18.0
Further details — not scored
Size16 MB6 MB
Age rating4+4+
DeveloperJoe WatsonJAMES ROBERT DE RUYTER

In-app purchases

None

Calcu

No in-app purchases

1 purchases

Muster Army Builder

One-time1
  • Muster Pro$4.99

Questions

Is Calcu free?
Calcu is free to download, with no in-app purchases.
Is Muster Army Builder free?
Muster Army Builder is free to download, with in-app purchases available.
Do Calcu or Muster Army Builder have ads?
Neither Calcu nor Muster Army Builder shows ads.
Which is updated more often, Calcu or Muster Army Builder?
Calcu ships an update every 6 weeks, and Muster Army Builder every 3 days. Most recently, Calcu was updated on October 7, 2026 and Muster Army Builder on October 13, 2026.

Other comparisons