Comparison

OTenkeyCalc vs Chain Calculator

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

Head to head

Easy Edit,Save History,No Ads

Free

🔧 Utilities

No ratingsView app →

About

OTenkeyCalc

Features

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Numeric ten keypad calculator that also displays the current temperature and weather at your current location * Weather information source: Apple Weather Service https://developer.apple.com/weatherkit/data-source-attribution/ https://support.apple.com/ja-jp/105038

About

Chain Calculator

Read full description

[Key Features] - Edit & Auto-Update : Modify any past value and watch all connected results update in real-time. - Save History : Save your frequently used formulas to your favorites and reuse them whenever you need. - Dark Mode Support : Enjoy a sleek, eye-friendly dark mode that adapts to your system settings. - Ad-Free Experience : Enjoy a clean, distraction-free environment with absolutely no ads.

Screenshots

OTenkeyCalc1 screens

Chain Calculator4 screens

Verdict

The call

The clearest difference is ads: Chain Calculator at none against OTenkeyCalc's shown. Chain Calculator also leads on iOS requirement (13.0 vs 16.7.10). OTenkeyCalc's advantage is update cadence (every 2 weeks vs monthly). On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

OTenkeyCalc ships an update every 2 weeks, Chain Calculator monthly. The most recent releases landed on October 17, 2026 and October 6, 2026 respectively.

Scorecard3 real differences · 3 level

OTenkeyCalc versus Chain Calculator: the parameters behind the verdict, then further details
Parameter	OTenkeyCalc	Chain Calculator
Price	Free	Free
Update frequency	Every 2 weeks — better	Monthly
Ads	Yes	No — better
In-app purchases	No	No
Devices	iPhone, iPad	iPhone, iPod
Requires iOS	16.7.10	13.0 — better
Further details — not scored
Size	37 MB	18 MB
Age rating	4+	4+
Developer	Hideaki Uchikoshi	seongkuk park

In-app purchases

None

OTenkeyCalc

No in-app purchases

None

Chain Calculator

No in-app purchases

Questions

Is OTenkeyCalc free?

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

Is Chain Calculator free?

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

Do OTenkeyCalc or Chain Calculator have ads?

OTenkeyCalc shows ads; Chain Calculator does not.

Which is updated more often, OTenkeyCalc or Chain Calculator?

OTenkeyCalc ships an update every 2 weeks, and Chain Calculator monthly. Most recently, OTenkeyCalc was updated on October 17, 2026 and Chain Calculator on October 6, 2026.