Comparison

FEEL THIS vs String Tension Calc

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

Head to head
About

FEEL THIS

Features
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FEEL THIS turns touch into an experience. From the crisp snap of a click to the deep rumble of thunder, explore over 20 finely-tuned vibration effects, each crafted to feel different under your fingertips. FEATURES โ€ข 20+ curated vibration presets โ€” Face ID, Heartbeat, Mech Click, Silk Ripple, Glitch, Laser, Waterfall, and more โ€ข 7 visual touch effects โ€” Ripple, Bounce, Fracture, Sonar, Particle, Ink, Orb โ€ข MAKE YOUR OWN MIX โ€” fine-tune intensity and sharpness to build your own vibration texture โ€ข Auto Mode โ€” draw a waveform and loop it as your own personal vibration sequence โ€ข Gallery โ€” a curated collection of sensory vibrations to explore โ€ข Light and dark themes, with support for multiple languages โ€ข One-time PRO purchase โ€” remove ads permanently and unlock Bomb mode No account required. No unnecessary data collection. Just your phone, and what it can make you feel.

About

String Tension Calc

Features
Read full description

Unlock the perfect tone and playability with precise string tension calculations. Whether you are a luthier, technician, or player, this app helps you optimize your guitar setup instantly. The intuitive String Tension Dashboard displays real-time data for all six strings. Simply input your scale length, string gauge, and tuning to see exact tension in pounds. Avoid breakage and improve intonation with data-driven precision. Designed for speed and accuracy, this tool supports standard and alternate tunings. Get the perfect feel for your instrument today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

FEEL THIS4 screens
String Tension Calc4 screens

Verdict

The call

The clearest difference is ads: String Tension Calc at none against FEEL THIS's shown. FEEL THIS's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and in-app purchases there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. FEEL THIS sells 1 one-off in-app purchase and String Tension Calc sells 4 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

FEEL THIS ships an update fortnightly, String Tension Calc every 3 weeks. The most recent releases landed on October 18, 2026 and October 21, 2026 respectively.

Scorecard3 real differences ยท 3 level
FEEL THIS versus String Tension Calc: the parameters behind the verdict, then further details
ParameterFEEL THISString Tension Calc
PriceFreeFree
Update frequencyFortnightly โ€” betterEvery 3 weeks
AdsYesNo โ€” better
In-app purchasesYesYes
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS15.0 โ€” better17.0
Further details โ€” not scored
Size22 MB44 MB
Age rating4+4+
DeveloperYOONGUN OHVasilii Polovnikov

In-app purchases

1 purchases

FEEL THIS

One-time1
  • Lifetime Pro Pass$1.99
4 purchases

String Tension Calc

Subscriptions3
  • Premium$2.997 Days
  • Premium$3.991 Month
  • Premium$5.991 Year
One-time1
  • Lifetime$7.99

Questions

Is FEEL THIS free?
FEEL THIS is free to download, with in-app purchases available.
Is String Tension Calc free?
String Tension Calc is free to download, with in-app purchases available.
Do FEEL THIS or String Tension Calc have ads?
FEEL THIS shows ads; String Tension Calc does not.
Which is updated more often, FEEL THIS or String Tension Calc?
FEEL THIS ships an update fortnightly, and String Tension Calc every 3 weeks. Most recently, FEEL THIS was updated on October 18, 2026 and String Tension Calc on October 21, 2026.

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