Comparison

QuaternionCalc vs Tredecuple Calc

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

Head to head

About

QuaternionCalc

Features

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Performs quaternion operations. Includes operations are quaternion transpose, quaternion multiplication, forward transformations, reverse transformations, conversion from quaternion to Euler angles and generation a quaternion from two unit vectors.

About

Tredecuple Calc

Features

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Display 13 calculators and perform calculations with each one.

Screenshots

QuaternionCalc1 screens

Tredecuple Calc1 screens

Verdict

The call

The clearest difference is price: Tredecuple Calc at Free against QuaternionCalc's $2.99. Tredecuple Calc also leads on update cadence (every 2 weeks vs every 15 months) and iOS requirement (15.8.3 vs 18.0). QuaternionCalc's advantage is ads (none vs shown). On in-app purchases 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

Tredecuple Calc is free to download; QuaternionCalc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

QuaternionCalc ships an update every 15 months, Tredecuple Calc every 2 weeks. The most recent releases landed on October 12, 2026 and July 31, 2026 respectively.

Scorecard4 real differences · 2 level

QuaternionCalc versus Tredecuple Calc: the parameters behind the verdict, then further details
Parameter	QuaternionCalc	Tredecuple Calc
Price	$2.99	Free — better
Update frequency	Every 15 months	Every 2 weeks — better
Ads	No — better	Yes
In-app purchases	No	No
Devices	iPhone, iPad	iPhone, iPad, iPod — better
Requires iOS	18.0	15.8.3 — better
Further details — not scored
Size	2 MB	36 MB
Age rating	4+	4+
Developer	Princeton Satellite Systems	Hideaki Uchikoshi

In-app purchases

None

QuaternionCalc

No in-app purchases

None

Tredecuple Calc

No in-app purchases

Questions

Is QuaternionCalc free?

QuaternionCalc costs $2.99, with no in-app purchases.

Is Tredecuple Calc free?

Tredecuple Calc is free to download, with no in-app purchases.

Do QuaternionCalc or Tredecuple Calc have ads?

Tredecuple Calc shows ads; QuaternionCalc does not.

Which is updated more often, QuaternionCalc or Tredecuple Calc?

QuaternionCalc ships an update every 15 months, and Tredecuple Calc every 2 weeks. Most recently, QuaternionCalc was updated on October 12, 2026 and Tredecuple Calc on July 31, 2026.