Comparison

GPS String vs 88Keys Multi Tones Piano

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

Head to head
About

GPS String

Measure distances between two points on a map, calculate areas by marking three or more points, and save or copy results. It also provides current GPS location data that can be copied for use in emails or notes.

Highlights
  • Measure distance between two points
  • Calculate area with three or more points
  • Save and copy measurement results
  • Switch map views (map, satellite, hybrid)
  • Copy current GPS location
  • Toggle GPS data display (angle, DMS)
Features
Read full description

マップ画面で任意の2ポイントを指示するとその間の距離を計測します。(PINボタン) ピンをタッチするとその前のピンとの距離を表示します。 更に3点以上のポイントを指示すれば面積も算出します。(コンパスアイコン) 計測結果は内部に保存したり、ペーストボードに文字列でコピーすることが出来ます。 マップは地図形式、地図+衛星写真、衛星写真を切り替えできます。 また検索機能を備えています。 ホーム画面ではiPhoneのGPS機能で現在地を測位し、そのデータをボタンだけでペーストボードに文字列でコピーします、コピーされたデータはメイルやメモ等にペーストすることが出来ます。 測位情報は角度表示と一般的なDMS表示(度、分、秒の表示)を切り替えることが出来ます。 コピー文字列はレポート等に適した形式とマップアプリの検索項に適した形式の2種類を切り替えできます。

About

88Keys Multi Tones Piano

This application offers a virtual piano experience with multiple instrument sounds like strings, bass, and drums. It features two piano rolls for easy playing across a wide range and includes volume and reverb controls.

Highlights
  • Dual piano rolls
  • Multiple instrument tones
  • Volume and reverb controls
  • Adjustable tuning (440/442 Hz)
  • Steinway & Sons piano sound
Features
Read full description

Play Piano, Strings, Bass and Drums on two keyboard rows. Explore a wide range of notes, choose a different instrument for each row, and adjust the sound to suit your playing. FEATURES • Two keyboard rows, with up to 88 keys on each row • Four instruments: Piano, Strings, Bass and Drums • Keyboard scrolling and zoom • Volume and reverb controls • 440 Hz / 442 Hz tuning FREE PLAY The basic mode lets you play Piano with 24 fixed keys on each row, including offline. Volume, reverb, tuning, scrolling and zoom remain available. Basic mode may display ads at breaks in use. On your first launch, try all keys and instruments for 3 minutes of use. No purchase is required and this preview does not start a subscription. When a rewarded ad is available, you can choose to watch it to unlock all keys and instruments for another 3 minutes. If an ad is unavailable, you can continue playing the basic piano. FULL ACCESS Choose a monthly subscription or a one-time lifetime purchase for all 88 keys on each row, all four instruments, and unlimited play without ads. Purchased access supports offline play while the entitlement remains valid. Existing owners of the previous No Ads purchase retain full access without purchasing again. Purchases can be restored from the plans screen. The monthly subscription renews automatically until cancelled. You can manage or cancel renewal in your App Store account settings. After cancellation, access continues until the paid period ends. Prices are shown in the app for your App Store region. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

GPS String4 screens
88Keys Multi Tones Piano3 screens

Verdict

The call

The clearest difference is in-app purchases: GPS String at none against 88Keys Multi Tones Piano's 1. GPS String also leads on ads (none vs shown) and update cadence (every 3 days vs every 3 months). On price, review sentiment 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. 88Keys Multi Tones Piano sells 1 one-off in-app purchase. GPS String asks for nothing beyond the download.

UpkeepUpdate frequency

GPS String ships an update every 3 days, 88Keys Multi Tones Piano every 3 months. The most recent releases landed on October 7, 2026 and October 19, 2026 respectively.

Scorecard5 real differences · 5 level
GPS String versus 88Keys Multi Tones Piano: the parameters behind the verdict, then further details
ParameterGPS String88Keys Multi Tones Piano
PriceFreeFree
Rating—5.0 (5 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—5 — better
Update frequencyEvery 3 days — betterEvery 3 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS8.0 — better15.0
Further details — not scored
Size1 MB226 MB
Age rating4+4+
DeveloperTakuo MatsumuraKANIYONIKA

Customer experience

GPS String

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

88Keys Multi Tones Piano

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

GPS String

No in-app purchases

1 purchases

88Keys Multi Tones Piano

One-time1
  • No Ads$1.99

Questions

Is GPS String free?
GPS String is free to download, with no in-app purchases.
Is 88Keys Multi Tones Piano free?
88Keys Multi Tones Piano is free to download, with in-app purchases available.
Do GPS String or 88Keys Multi Tones Piano have ads?
88Keys Multi Tones Piano shows ads; GPS String does not.
Which is updated more often, GPS String or 88Keys Multi Tones Piano?
GPS String ships an update every 3 days, and 88Keys Multi Tones Piano every 3 months. Most recently, GPS String was updated on October 7, 2026 and 88Keys Multi Tones Piano on October 19, 2026.

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