Comparison

JumpEye vs Chrono Tap

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

Head to head
About

JumpEye

This app analyzes vertical jump height by calculating flight time using your device's high-speed camera. Record or import videos, mark takeoff and landing frames, and get an automatic jump height calculation. It also offers a Rebound Jump Index for continuous jumping analysis.

Highlights
  • Vertical jump height calculation
  • Flight time measurement
  • High-speed camera integration
  • Video import from Photo Library
  • Manual frame marking (takeoff/landing)
  • Rebound Jump Index calculation
  • Automatic file naming and editing
Read full description

JUMP EYE ◆Attention on using slow videos in the camera roll◆ 

The playback speed of slow videos saved in the camera roll will be edited to normal speed forcibly instead of slow at the beginning and the end of the video. If you load the video as it is, the playback speed at the beginning and end of the video will not be slow in JumpEye as well, so you will not be able to measure the video accurately.

To fix this issue, go to the Photos app, select the video you want to import and tap the Edit button in the upper right corner of the playback screen.
The barcode white lines displayed at the bottom of the video on the edit screen will be narrower at the left and right edges than at the center.
By widening the spacing between the rightmost and leftmost white lines, you can slow down the playback speed of all of your videos.
After editing, please load the video in JumpEye for measurement.

In addition, if you can not start the camera application in JumpEye, please open the settings application and search "JumpEye" in the search window.
Tap "JumpEye" in the search results, you will go to the privacy settings screen of JumpEye.
After that, please give permission for all photos, microphone, camera. □General Information□ JUMP EYE has been developed to calculate the vertical jump height by using the flight time. Use your iPhone's high-speed camera to measure the flight time during a vertical jump. □Procedure□ 1. Open JUMP EYE and adjust the camera’s focus on an athlete's feet. 2. Simply record videos of a vertical jump using Slo-Mo (120/240 fps) or import the ones you want from the Photo Library. 3. Once we playback the video, we have to then manually go through frame by frame to identify and mark the takeoff and landing frames (press “start” and “stop”). 4. The formula then automatically calculates the duration of the flight and the jump height. □Main characteristics□ ・Videos are given an automatic file name (hh:mm:ss), which can be edited by holding down on the icon for one second, then we can rename or delete the file. ・After marking the frames, the jump height is automatically labelled after the file name. ・You can also import movies from the Photo Library. ・Manual focus makes feet and floor easily identifiable and precise. ・You can playback the movie in 3 ways (manual slider, frame by frame, and 10 frame mode). ・The pinch-to-zoom feature is available. ・The Rebound Jump Index (RJI) can be calculated by continuous jumping (press “RJindex”). □Note□ The equation to calculate jump height is justified only if the center of mass height is the same at takeoff and landing. Therefore, if you land on the ground in a crouched position, your jump height will be overestimated.

About

Chrono Tap

Record videos and instantly analyze timing for sports with this app. It combines video recording and stopwatch functionality, allowing for precise time measurement by marking start and end points within your footage. Analyze laps, playback at different speeds, and even draw on videos.

Highlights
  • Record video and analyze time simultaneously
  • Mark start and end points for precise timing
  • Unlimited lap measurements
  • Playback video at variable speeds
  • Draw lines on video
  • Export results to other apps
  • Pinch-to-zoom video playback
Features
Read full description

ChronoTapは、スマートフォンで動画を撮影、すぐその場でタイムの分析ができるアプリです。 スポーツのシーンにおいて動画の撮影は欠かせないツールの一つとなりました。 0.01秒を競うスポーツにおいて、正確なタイムの計測は欠かせません。 ストップウォッチを持って動画も撮影する。 そんな煩わしさを解消してくれるアプリです! これ一つでビデオがストップウォッチに早変わり。 ・簡単な操作方法 1. スマートフォンのカメラで動画を撮影 2. ChronoTapアプリを立ち上げる 3. Menuから動画の読み込み 4. 撮影した動画を選択 5. スタートの位置を決定したら時計のマークをクリック 6. タイムを測定したい場所まで動画を動かして旗のマークをクリック 操作はたったのこれだけ! ビデオの開始点と終了点に合わせて、正確なタイムを算出できます。 Lapは、無制限に何回でも計測可能。 ・便利な機能 間違えて押してしまったLapは、スワイプすることで削除できる Menuから、過去に分析した履歴を遡ることができる 結果を、LINEやメモなどに吐き出せる 動画を2本指でピンチすることで拡大できる 拡大した動画は、ダブルクリックで元のサイズに戻すことができる ペンのマークをクリックすると、動画内に直線を引くことができる 動画の再生速度を0.25、0.5、0.75倍速に変更することができる 動画は全画面表示のまま再生、コマ送り、コマ戻しに対応 電卓機能を入れたことで、動画を見ながらピッチの計算ができる

Screenshots

JumpEye4 screens
Chrono Tap2 screens

Verdict

The call

The clearest difference is review sentiment: Chrono Tap at 100% against JumpEye's 56%. JumpEye's advantage is price ($2.99 vs $9.99) and update cadence (every 2 months vs every 4 months). On ads, in-app purchases, monetization model 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

JumpEye costs $2.99 and Chrono Tap $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

JumpEye ships an update every 2 months, Chrono Tap every 4 months. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
JumpEye versus Chrono Tap: the parameters behind the verdict, then further details
ParameterJumpEyeChrono Tap
Price$2.99 — better$9.99
Rating4.7 (3 ratings) — better—
Positive reviews55.6% of reviews100.0% of reviews — better
Number of ratings3 — better—
Update frequencyEvery 2 months — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS16.6 — better18.2
Further details — not scored
Size5 MB3 MB
Age rating4+4+
Developer株式会社S-CADEmaho yamamoto

Customer experience

JumpEye

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive55.6%
Neutral0.0%
Negative44.4%

Chrono Tap

Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

JumpEye

No in-app purchases

None

Chrono Tap

No in-app purchases

Questions

Is JumpEye free?
JumpEye costs $2.99, with no in-app purchases.
Is Chrono Tap free?
Chrono Tap costs $9.99, with no in-app purchases.
Do JumpEye or Chrono Tap have ads?
Neither JumpEye nor Chrono Tap shows ads.
Which is updated more often, JumpEye or Chrono Tap?
JumpEye ships an update every 2 months, and Chrono Tap every 4 months. Most recently, JumpEye was updated on October 29, 2026 and Chrono Tap on October 28, 2026.

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