Octuple Calc vs Smart Instant Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Octuple Calc
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Display eight calculators and perform calculations with each one.
Smart Instant Calculator
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◇Why Smart Calculator?◇ ・Real-time results: No “=” required—answers appear as you type. ・Widget-first: Do the math right on the Home Screen, then hand off values to the app. ・Keep & Drop: Ditch confusing M+/M−. Save a value with Keep, remove it with Drop—simple and intuitive. ・Only the essentials: All the everyday functions you actually use. ・Designed for comfort: Clean UI and eye-friendly colors for long sessions. ・Completely free: Every feature, no paywall. ◇Recommended For◇ ・You want a clean, straightforward calculator ・The default calculator feels limited ・You prefer instant results and minimal taps ・Opening an app for every quick calc is a hassle
Screenshots
Verdict
The clearest difference is update cadence: Octuple Calc at every 2 weeks against Smart Instant Calculator's every 2 months. Octuple Calc also leads on iOS requirement (15.8.3 vs 18.0). On price, ads, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Octuple Calc ships an update every 2 weeks, Smart Instant Calculator every 2 months. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.
| Parameter | Octuple Calc | Smart Instant Calculator |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.8.3 — better | 18.0 |
| Further details — not scored | ||
| Size | 36 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideaki Uchikoshi | Ichi Hosotsuji |
In-app purchases
Octuple Calc
No in-app purchases
Smart Instant Calculator
No in-app purchases
Questions
Is Octuple Calc free?
Is Smart Instant Calculator free?
Do Octuple Calc or Smart Instant Calculator have ads?
Which is updated more often, Octuple Calc or Smart Instant Calculator?
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