Comparison

Periodic Timer vs AIert

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

Head to head
About

Periodic Timer

This app provides a simple, repeating interval timer that can run in the background without distracting you. It offers customizable alerts, quick start options, and prevents your screen from locking while active. Ideal for various activities like fitness, cooking, and learning.

Highlights
  • Repeating interval timer
  • Background operation
  • Customizable alerts (vibration/sound)
  • Prevent lockscreen
  • Shake to start
  • Multiple timer output modes
Features
Read full description

Keep track of time without being distracted by the device! Simple and easy timer that repeats at your chosen interval. FEATURES - Vibration, if sound is off. - Works in the background. - 3 timer output modes: intervals, total time, countdown. - You can cancel or pause the timer with help of a notification. - Quick Start from icon. - Shake To Start - can be enabled in settings. - Prevent Lockscreen - another useful setting, the screen will not lock, while the timer is running. USE CASES Here is a list of known use cases based on the real feedback: Fitness and health: - Stretching - Stationary bicycle (interval training) - On a treadmill - For HIIT - Jogging - Timed medication - Boxing Cooking - While frying potatoes - Roasting steaks - Checking an over or a grill to prevent burning Learning & science - Foreign language learning - As a lab timer - Periodic data collection - Speech training - Presentation timing Other - Mindfulness - Communication - To have a sense of time flying away :) HELP Q: Why the timer doesn't work in the background? A: You should allow notifications. Q: How to turn off the sound and turn on the vibration? A: On the device, turn the Silent Mode on. (Side Switch) Q: Alert is limited for 5 seconds! A: Go to Settings app, then Periodic Timer > Notifications > Banner Style > Persistent. Q: How to switch the Timer Output Mode? A: To switch the Output Mode touch the timer display at the top of the screen. Q: What is Shake To Start for? A: Shake To Start setting allows to start/cancel the timer by shaking the device. Thus, you don't touch the screen, what can be useful while cooking, for example. In order for this mode to work, the app should be open. If you still have questions or suggestions, you can visit the support page (https://goo.gl/forms/pggVBcaBxdW85EGE3), the Facebook group (http://www.facebook.com/groups/PeriodicTimer/) or you can email me (periodictimer.sup@gmail.com). If you like the app - please, rate it!

About

AIert

Features
Read full description

AIert keeps an eye on the AI services you depend on and tells you the moment they go down — or come back. Now you can explore their status as a living, interactive 3D universe. Every AI service is a planet, so you can see at a glance which ones are healthy and which are having trouble — then tap any service to drill down into its individual components. KEY FEATURES • Interactive 3D status view - explore AI services like a solar system and read their status at a glance • Per-service alerts - choose exactly which services and components you want to be notified about • Instant push notifications when a service goes down or recovers • Real-user reports - see what others are experiencing right now Stop refreshing status pages. Let AIert tell you. — AIert is an independent app and is not affiliated with, endorsed by, or sponsored by any of the providers it monitors. All product names and trademarks are the property of their respective owners.

Screenshots

Periodic Timer4 screens
AIert4 screens

Verdict

The call

The clearest difference is update cadence: AIert at every 4 days against Periodic Timer's every 2 months. Periodic Timer's advantage is device support (3 vs 1). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Periodic Timer ships an update every 2 months, AIert every 4 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
Periodic Timer versus AIert: the parameters behind the verdict, then further details
ParameterPeriodic TimerAIert
PriceFreeFree
Rating4.1 (170 ratings) — better—
Positive reviews52.1% of reviews—
Number of ratings170 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS18.018.0
Further details — not scored
Size26 MB12 MB
Age rating4+4+
DeveloperVladimir KelinMinsung Kim

Bugs and requests

Periodic Timer

Reported bugs

12 issues
  • Sound/notifications fail to trigger despite settings enabled
  • Timer cancels when phone is shaken or moved
  • Vibration doesn't work when screen is locked or off
  • App crashes on launch (especially after updates)
  • Watch app crashes or doesn't function
Show 7 more
  • Notifications inconsistent on Apple Watch
  • Timer speed inaccurate (runs too fast)
  • App won't open after deletion and reinstall
  • Upgrade popup spams every second, making app unusable
  • Heart rate monitor stays active, draining battery
  • Vibration doesn't work on silent mode
  • Watch green light stays on continuously

Requested features

15 requests
  • Adjustable sound volume and custom alert sounds
  • Customizable vibration patterns
  • Settings menu for user preferences
  • Ability to add notes/labels to timers
  • Seconds-only timer option
Show 10 more
  • Simple countdown timer (non-repeating)
  • Separate exercise and rest period intervals
  • Start timer at specific time of day
  • Disable sound option for silent vibration-only mode
  • Prevent screen lock while timer is running
  • Apple Watch vibration support
  • Seconds increment option (not just minutes)
  • Better Apple Watch complications and integration
  • Free trial period before purchase requirement
  • Disable shake-to-cancel functionality

AIert

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Periodic Timer

No in-app purchases

None

AIert

No in-app purchases

Questions

Is Periodic Timer free?
Periodic Timer is free to download, with no in-app purchases.
Is AIert free?
AIert is free to download, with no in-app purchases.
Do Periodic Timer or AIert have ads?
Neither Periodic Timer nor AIert shows ads.
Which is updated more often, Periodic Timer or AIert?
Periodic Timer ships an update every 2 months, and AIert every 4 days. Most recently, Periodic Timer was updated on October 24, 2026 and AIert on October 25, 2026.

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