Comparison

369Sonic vs my15c

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

Head to head
About

369Sonic

Features
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369Sonic is an application designed for easy and intuitive control of ultrasonic knives and cutters. It allows users to change blade types and customize settings such as cutting frequency. The application also provides useful real-time information, including current performance, temperature, and battery charge status.

About

my15c

Features
Read full description

my15C is a faithful emulation of the classic 15C — the legendary RPN scientific programmable calculator, running the original Voyager-series microcode ROM, cycle-accurate. Built for engineers, scientists, and RPN enthusiasts who want the real thing in their pocket — not just a look-alike. FEATURES • Authentic 15C ROM emulation — same logic, same quirks as the original 1982 hardware • Full RPN entry with a 4-level stack • Complex number arithmetic • Matrix operations • Numerical integration (∫f(x)) • Root solving (SOLVE) • Full programmability — write, edit, and run your own programs • Continuous memory with iCloud sync across your devices • Authentic 7-segment LCD display and keyboard layout • Landscape-optimized for iPhone, iPad, and Mac

Screenshots

369Sonic4 screens
my15c4 screens

Verdict

The call

The clearest difference is in-app purchases: 369Sonic at none against my15c's 1. 369Sonic also leads on iOS requirement (13.0 vs 26.0). my15c's advantage is update cadence (every 2 days vs every 9 days). On price, ads and device support there is nothing between them.

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. my15c sells 1 one-off in-app purchase. 369Sonic asks for nothing beyond the download.

UpkeepUpdate frequency

369Sonic ships an update every 9 days, my15c every 2 days. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.

Scorecard3 real differences Ā· 3 level
369Sonic versus my15c: the parameters behind the verdict, then further details
Parameter369Sonicmy15c
PriceFreeFree
Update frequencyEvery 9 daysEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPodiPhone, iPad, Mac — better
Requires iOS13.0 — better26.0
Further details — not scored
Size46 MB53 MB
Age rating4+4+
Developer369sonic s.r.o.Miroslav Perovic

In-app purchases

None

369Sonic

No in-app purchases

1 purchases

my15c

One-time1
  • Unlock Full App$9.99

Questions

Is 369Sonic free?
369Sonic is free to download, with no in-app purchases.
Is my15c free?
my15c is free to download, with in-app purchases available.
Do 369Sonic or my15c have ads?
Neither 369Sonic nor my15c shows ads.
Which is updated more often, 369Sonic or my15c?
369Sonic ships an update every 9 days, and my15c every 2 days. Most recently, 369Sonic was updated on September 10, 2026 and my15c on September 14, 2026.

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