Random Timer Generator vs Kairos
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Random Timer Generator
This app generates random countdown timers within a specified time range. It's versatile for games, meditation, exercise, studying, and more. Customize sounds, vibrations, and looping modes for a personalized experience.
- Configurable random countdowns
- Adjustable time ranges (0 seconds to 24 hours)
- Background operation support
- Customizable sound and vibration alerts
- Upload custom alarm sounds
- Looping mode with break periods
- Progress tracking for loops
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Random Timer Generator is a random countdown timer that allows you to input a Minimum and Maximum time, and then it will start a random timer somewhere within that range. Random Timer Generator allows you to create random timer countdowns, which makes it great as an exercise timer, a meditation timer, a random timer for studying, a Musical Chairs timer, or as a timer for Hot Potato style games like Catch Phrase, The Last Word, Pass The Bomb... or Hot Potato. ************************************ FEATURES * Fully configurable random countdowns with adjustable seconds, minutes, and hours * Supports timer durations from 0 seconds to 24 hours * The timer and alarm will still run properly even if your screen is locked or you have another app open * Enable or disable countdown noise options * Enable or disable vibrations when the timer ends * Enable or disable showing how much time is left while the random timer is going * Sounds an alarm when the timer hits 0. Choose from different alarm noise options, or go silent with vibrate-only option * Upload your own sound or song as the countdown sound, the sound when timer ends, or the sound when break period ends * Animates and vibrates when going off, so you'll notice the timer expiring in a noisy situation * Looping mode - set a random timer to go off repeatedly, so the next random timer starts again after one ends. You can even add a "break period between random timers", where you can set how many seconds you'd like as a break between random timers when Loop mode is on. * If Looping mode is on, it will tell you how many loops you have completed ************************************ Random Timer Generator is great for: * Games There are many Hot Potato style games where you don't want to be the person holding the ball (or potato) when the random timer goes off. Random Timer Generator works great for these Hot Potato style games, such as Catch Phrase, The Last Word, Pass The Bomb... or Hot Potato. Also great for board games where you need a random timer * Meditation When meditating, you may want to set a timer... but not know exactly when that timer will end (for example, a random timer that will go off somewhere between 10 and 30 minutes). Random Timer Generator works great for that. * Exercise While exercising, you may want to have a random timer for doing certain exercises, but not know exactly how long you will need to do it for. For example, you could set a minimum of 15 seconds and a maximum of 60 seconds while holding a forearm plank. * Musical Chairs With Random Timer Generator, you can set a random timer (for example between 5 seconds and 30 seconds) to go off for playing Musical Chairs. You can even have it playing songs while the timer is counting down. * Studying Andrew Huberman has popularized the Gap Effect or Spacing Effect method of studying, where you have a random timer go off every now and then while studying, to give yourself a short break. During that break, your brain replays what you were just learning at hyper speed.
Kairos
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Most timers tell you exactly when they end. Kairos does not. Set a minimum and maximum duration, start the timer, and Kairos chooses a random moment in between. You know the range. You do not know the exact finish. That simple twist makes Kairos useful anywhere timing should stay unpredictable. USE KAIROS FOR - Meditation: sit without watching the clock - Exercise: hold effort without bracing for the last seconds - Study sessions: add flexible focus or break intervals - Interval training: Auto Repeat randomises every set so you never anticipate the next round - Party games: perfect for Hot Potato, Musical Chairs, and other pass-it-fast games FEATURES - Random timer between your chosen minimum and maximum - Clean countdown interface designed for iPhone - Hide Time Display for a more focused, less predictable experience - Auto Repeat, Overtime, and Auto Stop modes after the timer ends - Label your timers for quick recognition in Recents - Choice of built-in alarm sounds - Haptic feedback when time is up - Recents for quickly restarting favorite timer setups - Light, Dark, and System theme - No ads or sign-up required Kairos is built for the moments when exact timing gets in the way and a little uncertainty makes the experience better.
Screenshots
Verdict
The clearest difference is in-app purchases: Kairos at none against Random Timer Generator's 1. Kairos also leads on update cadence (every 4 days vs every 2 months). On price, ads, device support 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
Both are free to download. Random Timer Generator sells 1 one-off in-app purchase. Kairos asks for nothing beyond the download.
Random Timer Generator ships an update every 2 months, Kairos every 4 days. The most recent releases landed on September 12, 2026 and September 15, 2026 respectively.
| Parameter | Random Timer Generator | Kairos |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (56 ratings) — better | — |
| Positive reviews | 82.9% of reviews | — |
| Number of ratings | 56 — better | — |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 30 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | OneUp App LLC | Benno Kohrs |
In-app purchases
Random Timer Generator
- Lifetime access$7.99
Kairos
No in-app purchases
Questions
Is Random Timer Generator free?
Is Kairos free?
Do Random Timer Generator or Kairos have ads?
Which is updated more often, Random Timer Generator or Kairos?
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