Comparison

Chemist Calc vs Prime Arch Int.

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

Head to head

Chemist Calc

Chemist Calculator

Free

📚 Education

★ 5.01 ratingsView app →

Prime Arch Int.

The Best of EA Standards

Free

📚 Education

No ratingsView app →

About

Chemist Calc

This app serves as a smart chemistry calculator for converting between moles and grams. It also provides a comprehensive periodic table with element specifications and unit conversion tools.

Highlights

Mole to gram conversion
Gram to mole conversion
Periodic table with element specifications
Unit conversion
Learn chemistry signs

Features

Read full description

Chemist Calc is a very smart chemist calculator. You can calculate moles to gram or gram to moles. You also have the whole periodic table elements with specification inside. You can convert between different units and also learn about all chemistry signs.

About

Prime Arch Int.

Features

Read full description

A practical guideline for how to use PrimeArch, an EA framework that combines the best of the most popular EA frameworks. Includes background, structure, meta objects, view types, cases and practical examples. The app is currently available in English (this app) and Swedish.

Screenshots

Chemist Calc4 screens

Prime Arch Int.4 screens

Verdict

The call

The clearest difference is in-app purchases: Prime Arch Int. at none against Chemist Calc's 1. Prime Arch Int. also leads on update cadence (every 4 months vs every 9 months). Chemist Calc's advantage is ads (none vs shown). On price, device support and iOS requirement 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. Chemist Calc sells 1 one-off in-app purchase. Prime Arch Int. asks for nothing beyond the download.

UpkeepUpdate frequency

Chemist Calc ships an update every 9 months, Prime Arch Int. every 4 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

Scorecard3 real differences · 6 level

Chemist Calc versus Prime Arch Int.: the parameters behind the verdict, then further details
Parameter	Chemist Calc	Prime Arch Int.
Price	Free	Free
Rating	5.0 (1 ratings) — better	—
Number of ratings	1 — better	—
Update frequency	Every 9 months	Every 4 months — better
Ads	No — better	Yes
In-app purchases	Yes	No — better
Monetization	Free	—
Devices	iPhone, iPad	iPhone, iPad, iPod — better
Requires iOS	16.0	15.0 — better
Further details — not scored
Size	11 MB	54 MB
Age rating	4+	17+
Developer	ilan TETRUASHVILI	aRway AB

In-app purchases

1 purchases

Chemist Calc

One-time1

Remove Ad's$0.99

None

Prime Arch Int.

No in-app purchases

Questions

Is Chemist Calc free?

Chemist Calc is free to download, with in-app purchases available.

Is Prime Arch Int. free?

Prime Arch Int. is free to download, with no in-app purchases.

Do Chemist Calc or Prime Arch Int. have ads?

Prime Arch Int. shows ads; Chemist Calc does not.

Which is updated more often, Chemist Calc or Prime Arch Int.?

Chemist Calc ships an update every 9 months, and Prime Arch Int. every 4 months. Most recently, Chemist Calc was updated on November 2, 2026 and Prime Arch Int. on November 7, 2026.