Comparison

Reaction Time Training vs STACK

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

Head to head
About

Reaction Time Training

Enhance your reflexes with engaging mini-games designed to test and improve reaction speed. Track your progress, compete with friends in duels, and climb leaderboards to unlock achievements. Ideal for anyone looking to sharpen their reaction time.

Highlights
  • Reaction time testing
  • Challenging mini-games
  • Progress tracking
  • Friend duels
  • Leaderboards
  • Achievement unlocking
Features
Read full description

RTap is the perfect app for reaction training! Test and improve your reaction time through challenging mini-games that make training fun and engaging. Track your progress as you get faster and compete with friends in exciting duels. Climb the leaderboards to reach the top spot and unlock achievements as you master different game modes. RTap offers great reaction training for anyone who wants to improve their reaction time and reflexes. Whether alone or in a duel with friends - RTap is the perfect app for your reaction training! privacy policy: https://mrjohn10.github.io/rtap/privacy-policy Terms of Use (EULA): https://mrjohn10.github.io/rtap/terms-of-service

About

STACK

Read full description

How high can you build? STACK: Tower Builder is a minimalist one-tap arcade game about timing, precision, and the irresistible pull of one more run. TAP TO STACK A block moves above your tower. Tap to drop it. Any overhang is sliced away, making the next placement smaller and every decision sharper. CHASE THE PERFECT DROP Center a block to keep your full platform and build a perfect streak. Stay calm as the tower rises and the margin for error disappears. UNLOCK YOUR STYLE Earn gems as you play, complete 18 awards, and unlock colorful tower skins. Track your best score, perfect drops, play time, and more. PLAY YOUR WAY Continue a run with an optional rewarded ad, or unlock the Full Game to remove ads, open every skin, and receive a premium continue. FEATURES • Simple one-tap controls • Endless precision-based gameplay • Colorful 3D visuals and haptic feedback • Six tower skins to collect • 18 awards with gem rewards • Detailed personal statistics • Portrait play designed for one hand • No account required One block. One tap. One more chance to build higher.

Screenshots

Reaction Time Training4 screens
STACK4 screens

Verdict

The call

The clearest difference is ads: Reaction Time Training at none against STACK's shown. 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. Reaction Time Training sells 9 in-app purchases, starting at $2.99 per 7 days and STACK sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Reaction Time Training ships an update every 10 days, STACK every 2 weeks. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.

Scorecard1 real difference · 9 level
Reaction Time Training versus STACK: the parameters behind the verdict, then further details
ParameterReaction Time TrainingSTACK
PriceFreeFree
Rating4.7 (203 ratings) — better—
Positive reviews55.6% of reviews—
Number of ratings203 — better—
Update frequencyEvery 10 days — betterEvery 2 weeks
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.315.0 — better
Further details — not scored
Size89 MB25 MB
Age rating12+4+
DeveloperJan AugustyniakJonathan Rycx

In-app purchases

9 purchases

Reaction Time Training

Subscriptions6
  • Unlimited Access$2.997 Days
  • Unlimited Access3 Days trial2 variants$4.991 Month
  • Unlimited Access3 variants$4.997 Days
Show 3 more
  • Unlimited Access3 Days trial$7.991 Month
  • Unlimited Access3 Days trial2 variants$19.991 Year
  • Unlimited Access$19.991 Year
One-time3
  • Unlimited AccessFree
  • Unlimited Access$14.99
  • Unlimited Access$29.99
5 purchases

STACK

One-time5
  • 250 Gems$0.99
  • 700 Gems$2.99
  • 1,500 Gems$5.99
Show 2 more
  • Full Game$7.99
  • 3,500 Gems$9.99

Questions

Is Reaction Time Training free?
Reaction Time Training is free to download, with in-app purchases available.
Is STACK free?
STACK is free to download, with in-app purchases available.
Do Reaction Time Training or STACK have ads?
STACK shows ads; Reaction Time Training does not.
Which is updated more often, Reaction Time Training or STACK?
Reaction Time Training ships an update every 10 days, and STACK every 2 weeks. Most recently, Reaction Time Training was updated on September 24, 2026 and STACK on September 10, 2026.

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