Comparison

Forethumb いろは vs Prime Time NTP

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

Head to head
About

Forethumb いろは

This app enables Japanese Morse code input on your iOS device. Once you memorize the codes, you can type even with your eyes closed. It supports single-key or paddle input with audible feedback and customizable spacing.

Highlights
  • Japanese Morse code input
  • Single-key or paddle input
  • Audible Morse feedback
  • Customizable space intervals
  • Swipe gestures for delete/space
Features
Read full description

「Forethumb いろは」はあなたのiOSデバイス上で和文モールス符号による文字入力を可能とします。 モールス符号を暗記させしてしまえば、目隠しをしても文字を入力することができます。 【機能】 ・単鍵式またはパドル式のモールス入力により文字入力が可能です。 ・モールスの入力時に音が鳴ります。 ・単鍵式の場合、キーを左にスワイプすると「削除」、右にスワイプすると「空白の入力」ができます。 ・空白(各点の間隔)の基本長を変更することが可能です。 【注意点】 ご利用にはキーボードの追加設定が必要です(設定 -> 一般 -> キーボード)。 また、音を鳴らすためには「フルアクセスの許可」をオンにする必要があります。 ※「フルアクセスの許可」によるデータ収集は一切行いませんのでご安心ください。 【サポート】 ・不具合報告やご質問・ご要望はお気軽にご連絡ください。 ・機能追加に関しましても対応を検討させていただきます。 ・開発者は予告なく古いiOSへのサポートを終了することがあります。

About

Prime Time NTP

This utility app displays the precise current time, accurate to the millisecond, by querying multiple NTP servers. It offers detailed insights into clock synchronization and network performance, with advanced features available via a one-time purchase.

Highlights
  • Millisecond time display
  • Queries multiple NTP servers
  • Detailed sync accuracy
  • Network performance metrics
  • Adaptive polling
  • One-time Pro upgrade
Features
Read full description

"Prime Time" is a high-precision time app that shows the true time, accurate to the millisecond. It queries NTP servers directly — the same infrastructure that keeps the internet in sync — and works out the correct time from their answers. Your device's own clock is never used for the display. [New in version 1.4] • Display Offset (Pro): run the large clock up to 99.999 seconds ahead of or behind real time, in 1 ms steps — for remote broadcasts, live streams, or any delayed feed. While it is on, the time turns yellow, with the offset above and the actual time below, so there is no mistaking it for real time. Measurements are never shifted. • Server details now use two columns in landscape on iPhone, so everything fits on one screen. • On iPhone with ProMotion, the clock now refreshes up to 120 times a second. [Free — one server, in full detail] • Real-time sync with one NTP server of your choice • Every exchange laid open: address, stratum, reference, root delay, jitter, estimated error, and the last eight exchanges • Millisecond display, refreshed up to 120 times a second on ProMotion screens • Offset and round-trip time with sparkline history • Adaptive polling that eases off as a server proves steady [Pro — one-time purchase, no subscription] • Compare up to 30 servers. With three or more, a server that is off is outvoted instead of skewing the time shown. • Manual sync on demand • Keep the screen awake while the app is open • Display Offset: run the clock ahead of or behind real time A note on accuracy: a round trip is a single number covering two unknown halves, and nothing in the exchange reveals how it was divided. Prime Time widens the reported ± rather than inventing a correction to hide it. On cellular, where the two directions are least alike, that margin is wider — and shown. Made for developers, network engineers, broadcast crews, and anyone curious about how far off their device's clock really is. Available in English, Japanese, German, and French.

Screenshots

Forethumb いろは4 screens
Prime Time NTP4 screens

Verdict

The call

The clearest difference is price: Prime Time NTP at Free against Forethumb いろは's $0.99. Prime Time NTP also leads on review sentiment (100% vs 58%) and update cadence (every 6 weeks vs every 31 months). Forethumb いろは's advantage is in-app purchases (none vs 1) and iOS requirement (16.4 vs 26.0). On ads 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

Prime Time NTP is free to download; Forethumb いろは costs $0.99 up front. Prime Time NTP sells 1 one-off in-app purchase. Forethumb いろは asks for nothing beyond the download.

UpkeepUpdate frequency

Forethumb いろは ships an update every 31 months, Prime Time NTP every 6 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
Forethumb いろは versus Prime Time NTP: the parameters behind the verdict, then further details
ParameterForethumb いろはPrime Time NTP
Price$0.99Free — better
Rating—4.0 (1 ratings) — better
Positive reviews58.3% of reviews100.0% of reviews — better
Number of ratings—1 — better
Update frequencyEvery 31 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.4 — better26.0
Further details — not scored
Size37 MB11 MB
Age rating4+4+
DeveloperTakuto NakamuraKentaro Saito

Customer experience

Forethumb いろは

Written reviews12 reviews
Positive58.3%
Neutral16.7%
Negative25.0%

Prime Time NTP

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Forethumb いろは

No in-app purchases

1 purchases

Prime Time NTP

One-time1
  • Pro Features$4.99

Questions

Is Forethumb いろは free?
Forethumb いろは costs $0.99, with no in-app purchases.
Is Prime Time NTP free?
Prime Time NTP is free to download, with in-app purchases available.
Do Forethumb いろは or Prime Time NTP have ads?
Neither Forethumb いろは nor Prime Time NTP shows ads.
Which is updated more often, Forethumb いろは or Prime Time NTP?
Forethumb いろは ships an update every 31 months, and Prime Time NTP every 6 weeks. Most recently, Forethumb いろは was updated on October 25, 2026 and Prime Time NTP on October 24, 2026.

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