Photo Time Lock vs Kairos
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Photo Time Lock
This app allows users to securely lock photos for a set duration, ranging from one minute to 365 days. It utilizes a timer-based system, preventing access to the photo until the countdown is complete. An optional keyholder feature allows designated individuals to unlock photos early.
- Time-delay photo locking
- Lock duration up to 365 days
- NTP server time verification
- Keyholder unlock option
- Intuitive and repeatable locking
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The only time-delay controlled Photo Lock app is now available on App store. Support iPhone 5 & iOS 6.0 What is Photo Time Lock? Using a secure, timer-locking feature, this app is the instinctive, intuitive, desired, and repeatable ability of an individual to voluntarily lock up anything (via photos contain combination of a lock), for any amount of time he or she selects, from 1 minutes to 365 days; items that are damaging to her health, or a threat to his very life. Scenarios: Gambling: An individual who knows that he has a gambling problem places all the “tools” of gambling (e.g. cash, checkbooks, credit cards, etc.) in a combination lockable container, scramble the combination and took a picture of the code via this app, and set a timer to lock this picture for 48 hours. Then he knows he will be out of gambling in the following two days. Beer: A beer drinker buys a case of beer, 24 cans. At home, he puts 3 beers on the top shelf of the refrigerator and 21 in a combination lockable container. He locks the container and put it on the bottom shelf of the refrigerator. He takes a picture of the randomly scramble combination via this app, and sets the timer-lock for 24 hours. Later in the day, could he go out and buy more beer? Yes, but a high percentage of individuals do not. Try it for yourself. Features: SECURE: The time of this app is verified via remote NTP server, thus tampering system time on the device will have absolutely no effect. KEYHOLDER UNLOCK: a keyholder who has the passcode can unlock any individual photo anytime even the countdown timer has not been reached zero. FLEXIBILITY: The lock time can be set from 1 minute to 365 days, in a minute interval. How to use it? 1. You may need a box that can be locked with a combination lock, and you should be able to randomly scramble the lock setting without looking it (or let your beloved one do it for you). 2. Run this app, create a new photo lock, and then take a picture of the combination lock without actually read the combination, you can look at a thumbnail of the picture to assure yourself you’ve got a decent picture, but the thumbnail doesn’t give enough resolution to see the combination. 3. Set a lock time from 1 minutes to 365 days, in one minute interval, you can also turn on “Keyholder Unlock” feature thus the keyholder can unlock this photo anytime by enter a passcode. Then tap “Start” to start the lock. WARNING – do not do this until you have thoroughly read the help manual and understood completely how this app works. 4. The photo will keep locked until the time countdown reached zero or your keyholder unlock it. Once unlocked, you can view the photo containing the combination. Now you can undo the combination lock to open your box.
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 price: Kairos at Free against Photo Time Lock's $9.99. Kairos also leads on update cadence (every 4 days vs every 55 months). Photo Time Lock's advantage is iOS requirement (8.0 vs 15.1). On ads, 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
Kairos is free to download; Photo Time Lock costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Photo Time Lock ships an update every 55 months, Kairos every 4 days. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.
| Parameter | Photo Time Lock | Kairos |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.2 (14 ratings) — better | — |
| Positive reviews | 63.6% of reviews | — |
| Number of ratings | 14 — better | — |
| Update frequency | Every 55 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 8.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 2 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Falcon In Motion LLC | Benno Kohrs |
In-app purchases
Photo Time Lock
No in-app purchases
Kairos
No in-app purchases









