Comparison

メトロノーム Poly vs Jazz Time Trainer

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

Head to head
About

メトロノーム Poly

Features
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【2つのリズムを同時演奏】ポリリズムに対応したメトロノーム 上下2分割画面の「ツインメトロノーム」。 2つのメトロノームが完全に独立して動くので、複雑なポリリズムや変拍子の練習がこれ1台で完結します。 リズムの異なるピアノの右手と左手の練習にも使えます。 タップテンポに対応しました。 利用規約: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Jazz Time Trainer

Features
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Jazz Time Trainer is a focused metronome and inner-pulse trainer built for jazz musicians, drummers, students, and serious practice sessions. This is not a generic click app. JTT is designed around the way musicians actually train time: internal pulse, click independence, 2 & 4 practice, gap-click work, odd meters, grouping, swing ride practice, subdivisions, and clean visual feedback. Key features: - 20-400 BPM tempo range - Stable high-output click engine - All Beats, 2 & 4, 1 Only, 4 Only - Gap Click and Random Drop timing challenges - Common time signatures for jazz practice - Odd meter and grouping concepts for modern jazz training - Subdivision practice for 8ths, 16ths, and triplet feels - Customizable beat accents and mute states - Multiple click sound profiles, including voice count mode - Swing Ride practice with Center, Ahead, and Layback feel options - Memory slots for saving practice setups - Minimal dark interface designed for practice, not distraction - Media mix mode for practicing while playing along with other audio JTT is made for musicians who care about time feel, not just BPM. No ads.

Screenshots

メトロノーム Poly3 screens
Jazz Time Trainer4 screens

Verdict

The call

The clearest difference is ads: Jazz Time Trainer at none against メトロノーム Poly's shown. Jazz Time Trainer also leads on iOS requirement (13.0 vs 15.6). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

メトロノーム Poly ships an update every 6 days, Jazz Time Trainer every 4 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 4 level
メトロノーム Poly versus Jazz Time Trainer: the parameters behind the verdict, then further details
Parameterメトロノーム PolyJazz Time Trainer
PriceFreeFree
Update frequencyEvery 6 daysEvery 4 days — better
AdsYesNo — better
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.613.0 — better
Further details — not scored
Size6 MB19 MB
Age rating4+4+
DeveloperNito KiyoshiSangwoo Shin

In-app purchases

None

メトロノーム Poly

No in-app purchases

None

Jazz Time Trainer

No in-app purchases

Questions

Is メトロノーム Poly free?
メトロノーム Poly is free to download, with no in-app purchases.
Is Jazz Time Trainer free?
Jazz Time Trainer is free to download, with no in-app purchases.
Do メトロノーム Poly or Jazz Time Trainer have ads?
メトロノーム Poly shows ads; Jazz Time Trainer does not.
Which is updated more often, メトロノーム Poly or Jazz Time Trainer?
メトロノーム Poly ships an update every 6 days, and Jazz Time Trainer every 4 days. Most recently, メトロノーム Poly was updated on October 30, 2026 and Jazz Time Trainer on October 31, 2026.

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