Comparison

Soff Seller vs Rustoz

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

Head to head

About

Soff Seller

Features

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With Soff Seller you are able to: -See the benefits -Upload your documents -Download the products you bought

About

Rustoz

Features

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Изучайте русский язык с Rustoz — интерактивным приложением, которое помогает развивать разговорные навыки, словарный запас и грамматику. Rustoz подходит как для начинающих, так и для пользователей с базовыми знаниями. В приложении доступны: • Speaking Assistant — практика разговорной речи • Упражнения для изучения слов и грамматики • Интерактивные задания (переводы, сопоставление, аудио) • Прогресс и таблица лидеров • Игровой режим (Battle mode) • Чат и уведомления Все функции доступны внутри приложения и помогают улучшать навыки чтения, письма, понимания и речи. Обучение проходит в интерактивной форме, что делает процесс более удобным и понятным.

Screenshots

Soff Seller4 screens

Rustoz4 screens

Verdict

The call

The clearest difference is device support: Rustoz at 3 against Soff Seller's 1. Rustoz also leads on iOS requirement (15.0 vs 17.6). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Soff Seller ships an update every 3 weeks, Rustoz every 2 weeks. The most recent releases landed on September 19, 2026 and September 15, 2026 respectively.

Scorecard2 real differences · 4 level

Soff Seller versus Rustoz: the parameters behind the verdict, then further details
Parameter	Soff Seller	Rustoz
Price	Free	Free
Update frequency	Every 3 weeks	Every 2 weeks — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone	iPhone, iPad, iPod — better
Requires iOS	17.6	15.0 — better
Further details — not scored
Size	27 MB	61 MB
Age rating	4+	4+
Developer	Alisher Shamuratov	Mirazam Abdullaev

In-app purchases

None

Soff Seller

No in-app purchases

None

Rustoz

No in-app purchases

Questions

Is Soff Seller free?

Soff Seller is free to download, with no in-app purchases.

Is Rustoz free?

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

Do Soff Seller or Rustoz have ads?

Neither Soff Seller nor Rustoz shows ads.

Which is updated more often, Soff Seller or Rustoz?

Soff Seller ships an update every 3 weeks, and Rustoz every 2 weeks. Most recently, Soff Seller was updated on September 19, 2026 and Rustoz on September 15, 2026.