Interval Timer Sec+Sec vs コラッツ計算機｜数列シミュレーター
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interval Timer Sec+Sec
This free interval training timer app uses alarms and vibrations to mark specified second intervals. It automatically tracks repetitions and remembers your settings, making it ideal for High Intensity Interval Training (HIIT). Background operation is limited.
- Second-based interval timing
- Alarm and vibration alerts
- Repetition counter
- Saves interval settings
- Suitable for HIIT
- Background operation limited
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Simple free interval training timer application that alarm and vibration at the time specified in seconds. After the set time has elapsed, it counts the number of repetitions. Since it keeps the specified seconds setting, it is no need to set the seconds every time. The behavior in the background is limited. For High Intensity Interval Training (HIIT).
コラッツ計算機｜数列シミュレーター
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コラッツ予想をシンプルに体験できる計算アプリです。 任意の自然数を入力するだけで、数列の変化を自動で計算し、わかりやすく表示します。 ■ 主な機能 ・コラッツ予想の自動計算 ・計算過程の一覧表示 ・ステップ数・最大値の表示 ・履歴保存機能（過去の計算をすぐ確認） ・計算負荷が高い場合の自動停止機能 ■ プレミアム機能 ・広告の非表示 ・計算結果のグラフ表示 ■ こんな方におすすめ ・数学や数列が好きな方 ・コラッツ予想に興味がある方 ・シンプルな計算ツールを探している方 直感的な操作で、誰でも簡単にコラッツ予想の世界を体験できます。
Screenshots
Verdict
The clearest difference is update cadence: コラッツ計算機｜数列シミュレーター at weekly against Interval Timer Sec+Sec's every 12 months. Interval Timer Sec+Sec's advantage is iOS requirement (13 vs 26.2). 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. Interval Timer Sec+Sec sells 1 one-off in-app purchase and コラッツ計算機｜数列シミュレーター sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Interval Timer Sec+Sec ships an update every 12 months, コラッツ計算機｜数列シミュレーター weekly. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.
| Parameter | Interval Timer Sec+Sec | コラッツ計算機｜数列シミュレーター |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (13 ratings) — better | — |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 13 — better | — |
| Update frequency | Every 12 months | Weekly — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13 — better | 26.2 |
| Further details — not scored | ||
| Size | 12 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | SHIGETO TAKAGI | Kenji Yanase |
In-app purchases
Interval Timer Sec+Sec
- Remove Ads$1.99
コラッツ計算機｜数列シミュレーター
- プレミアム$0.49
Questions
Is Interval Timer Sec+Sec free?
Is コラッツ計算機｜数列シミュレーター free?
Do Interval Timer Sec+Sec or コラッツ計算機｜数列シミュレーター have ads?
Which is updated more often, Interval Timer Sec+Sec or コラッツ計算機｜数列シミュレーター?
Other comparisons
