Comparison

Periodic Timer vs Siftello

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

Siftello

Features
Read full description

Make room for more memories, one photo at a time. Siftello turns a crowded photo library into small, manageable sorting sessions. Choose the photos you want to keep, set aside the ones you might delete, and come back to the maybes when you are ready. Sort 5 photos a day for free. Siftello Premium removes the daily limit. Available plans and prices are shown in the app before purchase. THREE SIMPLE CHOICES Swipe right to keep a photo. Swipe left to add it to Review. Swipe up to decide later. Prefer buttons? Use Keep, Delete, and Later instead. A left swipe does not delete a photo from your library. START WITH A SMALL SESSION Choose 10, 25, or 50 photos, or work through the whole collection. Browse recent photos, months, All Photos, and accessible albums to find a place to start. REVIEW BEFORE YOU DELETE Open the review grid, preview photos at full size, and adjust your selection. Only the photos you select are included in the final deletion request. Siftello asks you to confirm before requesting removal from your photo library. PICK UP WHERE YOU LEFT OFF Your collection progress and review queue are saved on your device. Take a break and return to the same cleanup later. Undo a recent sorting choice while you are in a session. YOUR PHOTOS STAY WITH YOU Siftello processes your library on your device and does not upload your photos. There is no Siftello account to create. Optional usage analytics and crash and performance reports are off by default; you can change these choices in Settings. Store and purchase services process the information needed to provide paid access. MAKE IT FEEL LIKE YOUR APP Choose light, dark, or system appearance, pick an accent palette, and adjust haptics, photo details, and swipe hints. ON iPHONE AND iPAD Confirmed deletions use the system photo-library flow. Deleted photos go to Photos' Recently Deleted album; storage may not be reclaimed immediately. Siftello respects the photo access you grant, including limited access. PREMIUM ACCESS Siftello supports monthly and yearly auto-renewing subscriptions and a lifetime one-time purchase, where offered. The available plans, localized prices, billing period, and any eligible introductory offer are displayed before purchase. Subscriptions renew automatically unless canceled through your Apple account before the store's renewal deadline. Manage or cancel a subscription in your Apple subscription settings, accessible from the app. Lifetime does not renew. Use Restore purchases to restore eligible purchases from your store account. Support: https://siftello.web.app/support Privacy Policy: https://siftello.web.app/privacy Terms of Use: https://siftello.web.app/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Contact: commonlistapp@gmail.com

Screenshots

Periodic Timer4 screens
Siftello4 screens

Verdict

The call

The clearest difference is in-app purchases: Periodic Timer at none against Siftello's 3. Siftello's advantage is update cadence (every 5 days vs every 2 months) and iOS requirement (15.0 vs 17.0). On price, ads 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. Siftello sells 3 in-app purchases, starting at $1.00 per month. Periodic Timer asks for nothing beyond the download.

UpkeepUpdate frequency

Periodic Timer ships an update every 2 months, Siftello every 5 days. Both last shipped on October 16, 2026.

Scorecard3 real differences · 7 level
Periodic Timer versus Siftello: the parameters behind the verdict, then further details
ParameterPeriodic TimerSiftello
PriceFreeFree
Rating4.1 (167 ratings) — better—
Positive reviews52.1% of reviews—
Number of ratings167 — better—
Update frequencyEvery 2 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS17.015.0 — better
Further details — not scored
Size23 MB45 MB
Age rating4+4+
DeveloperVladimir KelinGrzegorz Gaworowski

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

Siftello

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Periodic Timer

No in-app purchases

3 purchases

Siftello

Subscriptions2
  • Siftello Premium Monthly3 Days trial$1.001 Month
  • Siftello Premium Yearly$5.001 Year
One-time1
  • Siftello Premium Lifetime$10.00

Questions

Is Periodic Timer free?
Periodic Timer is free to download, with no in-app purchases.
Is Siftello free?
Siftello is free to download, with in-app purchases available.
Do Periodic Timer or Siftello have ads?
Neither Periodic Timer nor Siftello shows ads.
Which is updated more often, Periodic Timer or Siftello?
Periodic Timer ships an update every 2 months, and Siftello every 5 days. Most recently, Periodic Timer was updated on October 16, 2026 and Siftello on October 16, 2026.

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