Rabbit RSSリーダー vs Smart Instant Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rabbit RSSリーダー
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シンプルで使いやすく、軽量で高速なRSSリーダーアプリです。 RSS対応しているサイトであればどのサイトでも登録することができます。 人気サイトから選んで登録することもできます。 標準で広告を非表示にする機能が搭載されているため、記事を快適に閲覧することができます。
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: Smart Instant Calculator at every 2 months against Rabbit RSSリーダー's every 23 months. Rabbit RSSリーダー's advantage is iOS requirement (15.0 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.
Rabbit RSSリーダー ships an update every 23 months, Smart Instant Calculator every 2 months. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.
| Parameter | Rabbit RSSリーダー | Smart Instant Calculator |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 23 months | Every 2 months — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 43 MB | 8 MB |
| Age rating | 17+ | 4+ |
| Developer | RANRAN Solutions | Ichi Hosotsuji |
In-app purchases
Rabbit RSSリーダー
No in-app purchases
Smart Instant Calculator
No in-app purchases
Questions
Is Rabbit RSSリーダー free?
Is Smart Instant Calculator free?
Do Rabbit RSSリーダー or Smart Instant Calculator have ads?
Which is updated more often, Rabbit RSSリーダー or Smart Instant Calculator?
Other comparisons
