Comparison

Reaction Lab vs Reflex Trainer

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

Head to head
About

Reaction Lab

Measure and improve your response speed with a suite of scientifically-inspired tests. Track progress over time with detailed analytics and gain insights into your performance in various situations. Designed for focus and privacy, all data stays on your device.

Highlights
  • Multiple reaction time test types
  • Visual, audio, and haptic cues
  • Grip-release and motion-based tests
  • Dual-task and fatigue tracking
  • Detailed session summaries and trend charts
  • On-device data privacy
  • Offline functionality
Features
Read full description

Reaction Lab is a fast, accurate reaction-time testing suite built to help you measure and understand how quickly you respond in different situations. Whether you’re training for sports, improving focus, or tracking performance over time, Reaction Lab gives you clean, scientifically-inspired tests and easy-to-read analytics—right on your iPhone. Test Your Reaction Time in Multiple Ways Reaction time isn’t just one thing. Reaction Lab includes multiple test types designed to measure different pathways and skills: • Simple Visual Tap – Tap as soon as a visual stimulus appears • Choice Reaction – Respond to directional or on-screen prompts with speed and accuracy • Audio Reaction – React to sound cues for “eyes-off” testing • Haptic Reaction – React to vibration cues with no visuals or audio • Grip-Release (Inhibitory Control) – Hold, then release as fast as possible when prompted • Motion Reaction – React by moving the phone (tilt/lift/rotate) • Dual-Task Under Load – React while performing a secondary task to measure real-world performance • Fatigue Drift – Track how reaction time changes over a continuous timed session • Anticipation vs Reaction – Detect premature responses and impulse control patterns • Asymmetry Testing – Compare dominant vs non-dominant performance Track Progress Over Time Reaction Lab automatically saves your sessions and turns raw reaction data into meaningful insights: • Session summaries: median, average, best, worst, variability • Accuracy metrics: false starts, errors, timeouts • Trend charts by test type over 7 / 30 / 90 days • Per-session breakdowns across every trial Clean, Focused, Tool-Like Design Reaction Lab is built to be simple, fast, and distraction-free: • Large touch targets and high-contrast test screens • Clear trial progress indicators • Instant feedback on mistakes or false starts • Smooth navigation between tests, history, insights, and settings Fully On-Device and Private Your data stays on your device. • No accounts • No cloud sync required • No tracking • Works offline If you’ve ever wondered how your reaction time changes with training, fatigue, stress, or consistency—Reaction Lab gives you the tools to measure it. Download Reaction Lab and start testing. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://anthonyharveyapps.com/privacy-policy-reaction-lab

About

Reflex Trainer

Features
Read full description

Reflex Trainer measures your reaction time with precision, using real motion detected by your Apple Watch or iPhone. How It Works A visual stimulus flashes on your screen. React as fast as you can by throwing a punch (detected by your Apple Watch or iPhone accelerometer at 50Hz). Your reaction time is measured in milliseconds. Two Training Modes Combat Sports Mode Designed for boxing, MMA, kickboxing, and martial arts athletes. Throw a real punch when you see the flash. Your Apple Watch detects the motion, no screen tapping needed. Hold your phone in your fist as a fallback when training without a watch. General Reaction Mode A classic reaction time test for anyone. Tap the screen or move your wrist the instant you see the stimulus. Perfect for gamers, athletes, and anyone who wants to measure and improve their reflexes. Live 1v1 Duels Challenge a friend to a real-time reflex showdown. Share a code over iMessage or jump into the public lobby for a quick match. Both phones fire the same stimulus at the exact same moment, with server-authoritative timing keeping every round fair. Best of 1, 3, 5, or 10 rounds. Fastest reaction wins. Friends, Stats & History (NEW) Your Profile now has three tabs: Stats for your personal bests, History for every session you've ever run, and Friends for the people you train against. Add friends by username, get a push notification when they accept, and tap any past session to see every individual rep. Compare reaction times head to head and track your progress over time. Three Difficulty Levels - Easy: punch when you see red - Medium: no early punches allowed - Hard: distractor flashes appear, only red counts Climb the Leaderboards Sign in with Apple to track personal bests and rank globally. Every solo session and every clean duel feeds the same leaderboard, ranked by mode, difficulty, and round count. Your duel results count toward your personal bests too. Key Features - Apple Watch integration with real-time accelerometer punch detection - Live 1v1 duels with server-synchronised stimulus timing - Public lobby and quick match for instant duels - Friends list with mutual approval and push notifications - Full session history with per-rep breakdown - Three difficulty levels (Easy, Medium, Hard) - Customisable rounds (1 to 10 per session) - Per-round breakdown with average, best, and worst times - Global and weekly leaderboards - Personal bests tracked per mode and difficulty - Sign in with Apple (no email or password required) - Works with or without Apple Watch - No ads. No subscriptions. Who Is This For? - Boxers, MMA fighters, and combat sports athletes - Martial arts practitioners training reaction speed - Gamers looking to benchmark and improve reaction time - Personal trainers and coaches measuring client reflexes - Friends who want to settle who really has the faster reflexes - Anyone curious about their reaction speed Start training. Challenge a friend. Get faster.

Screenshots

Reaction Lab4 screens
Reflex Trainer2 screens

Verdict

The call

The clearest difference is in-app purchases: Reflex Trainer at none against Reaction Lab's 2. Reflex Trainer also leads on update cadence (every 5 days vs every 7 months) and device support (3 vs 1). On price, ads and iOS requirement 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 Lab sells 2 in-app purchases, starting at $1.99 per month. Reflex Trainer asks for nothing beyond the download.

UpkeepUpdate frequency

Reaction Lab ships an update every 7 months, Reflex Trainer every 5 days. The most recent releases landed on September 26, 2026 and October 12, 2026 respectively.

Scorecard3 real differences · 6 level
Reaction Lab versus Reflex Trainer: the parameters behind the verdict, then further details
ParameterReaction LabReflex Trainer
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 7 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad, Apple Watch — better
Requires iOS18.017.0 — better
Further details — not scored
Size22 MB7 MB
Age rating4+4+
DeveloperAnthony HarveyMax Szolcek

In-app purchases

2 purchases

Reaction Lab

Subscriptions2
  • React Fast Monthly3 Days trial$1.991 Month
  • React Fast Yearly3 Days trial$4.991 Year
None

Reflex Trainer

No in-app purchases

Questions

Is Reaction Lab free?
Reaction Lab is free to download, with in-app purchases available.
Is Reflex Trainer free?
Reflex Trainer is free to download, with no in-app purchases.
Do Reaction Lab or Reflex Trainer have ads?
Neither Reaction Lab nor Reflex Trainer shows ads.
Which is updated more often, Reaction Lab or Reflex Trainer?
Reaction Lab ships an update every 7 months, and Reflex Trainer every 5 days. Most recently, Reaction Lab was updated on September 26, 2026 and Reflex Trainer on October 12, 2026.

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