Comparison

Zen Timer. vs iSera Mentor

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

Head to head
About

Zen Timer.

This app helps you focus on meditation and mindfulness with customizable timers. Set preparation, meditation, interval, and cool-down times with various alert sounds and background music. Track your progress and maintain logs for a more peaceful practice.

Highlights
  • Create unlimited custom timers
  • Adjust preparation, meditation, and interval times
  • Select from 18 free interval sounds
  • Choose background music
  • Supports background and lock screen operation
  • Meditation log and report tracking
  • Multiple profiles and reminders
Features
Read full description

Zen Timer is a handy app to help you focusing on zen/meditation/insight, you can totally relax without worrying about time. It has four default timers and you can create and custom your own timers. You can custom the preparation time, meditation time, interval number & interval time (each interval time can be different), cool down time. 18 free sounds are available to be chosen as switch interval alert sound. Start the timer and enjoy the peace... Key Features: ⁃ Custom and create unlimited timers. ⁃ Custom preparation time, meditation time, interval number, interval time, cool down time and background picture. ⁃ Each interval time can be set as different duration. ⁃ Choose background music to be played from device. ⁃ Supports running in background and lock screen. ⁃ 18 free interval switch sounds. ⁃ Set switch sounds to be played one, two or three times. ⁃ Keep and share meditation logs. ⁃ Meditation time reports. ⁃ Multiple profiles. ⁃ Create unlimited reminders. ⁃ Passcode protection. ⁃ Dropbox backup and restore. ⁃ Supports transferring to Health app. ⁃ Supports Today Widget. ⁃ Supports Apple Watch version. ⁃ Supports universal version (available on both iPhone and iPad). If you have any question or suggestion, please email to linklinksapp@tom.com.

About

iSera Mentor

Features
Read full description

iSera is a mental wellness and journaling app. With AI-powered mentor character "Sera" you engage in Socratic dialogue and find your own answers. Not a fast chatbot - a calm, measured, non-judgmental companion. CORE FEATURES AI MENTOR CONVERSATIONS Sera is a calm 40-something character who blends Anatolian simplicity with a modern outlook. She asks first, never imposes. Her replies are short - 1 to 3 sentences. She doesn't recite proverbs or offer false hope. When she doesn't know something, she gently steers the conversation back to lived experience. EMOTION JOURNAL Log your daily emotion, body, and mind state. Leave a note. Choose from tags like calm, tired, hopeful, undecided, sensitive. Notes are only for you. WEEKLY SUMMARY Once you have two or more entries, the History screen shows an automatic 7-day emotional trend summary. Most frequent emotion, longest streak, day count. REMINDERS A daily nudge at your chosen time to take a moment for yourself. Adjust anytime from Profile. HISTORY VIEW Filter all your entries by time, emotion, or text. Open any entry for full details or delete it. ADDITIONAL FEATURES - 4-language support: Turkish, English, Spanish, German full localization - Themes: light green or dark green; auto mode follows your device theme - Optional sun sign greeting and a gentle daily note (small cultural touch, distance kept) - Sera persona settings for Premium users YOUR DATA All your entries and conversations live only on your device. Apart from the AI conversation service (Anthropic) and subscription infrastructure, no data is sent to servers. Profile > Data & privacy > "Share my data" gives you a JSON backup. KVKK and GDPR compliant. PLANS AND PRICING iSera Basic (Trial) - 7 days free trial - 35 total messages with Sera - After trial: YOU MADE IT badge + 10% off Plus/Premium for the first month iSera Plus - $9.99/month or $59.99/year (50% off) - 210 messages per week - 90 days of history - 5 reminders iSera Premium - $19.99/month or $119.99/year (50% off) - 525 messages per week - Unlimited history access - Sera persona settings - Early access to new features Yearly plans start with 7 days free. Auto-renews unless cancelled at the end of the period. You can cancel anytime in your App Store account settings. IMPORTANT iSera is not psychotherapy, it's a companion. For acute or chronic mental health needs, please consult a professional. TERMS OF USE: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ PRIVACY POLICY: https://go034.github.io/isera-privacy/privacy.html SUPPORT: oktayriding@gmail.com --- IMPORTANT: iSera is a wellness and journaling app. It does not provide medical diagnosis, treatment, or psychological counseling. Consult a healthcare professional for health concerns. Emergency resources are accessible from Profile > Settings > Emergency support.

Screenshots

Zen Timer.4 screens
iSera Mentor4 screens

Verdict

The call

The clearest difference is ads: iSera Mentor at none against Zen Timer.'s shown. iSera Mentor also leads on update cadence (every 2 weeks vs every 11 months). On price, in-app purchases, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Zen Timer. sells 2 in-app purchases, starting at $4.99 per 6 months and iSera Mentor sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Zen Timer. ships an update every 11 months, iSera Mentor every 2 weeks. The most recent releases landed on September 25, 2026 and October 3, 2026 respectively.

Scorecard2 real differences · 8 level
Zen Timer. versus iSera Mentor: the parameters behind the verdict, then further details
ParameterZen Timer.iSera Mentor
PriceFreeFree
Rating3.4 (13 ratings) — better—
Positive reviews65.2% of reviews—
Number of ratings13 — better—
Update frequencyEvery 11 monthsEvery 2 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.615.1 — better
Further details — not scored
Size76 MB41 MB
Age rating+412+
DeveloperLINKLINKS LTDGuven Davut Oktay

In-app purchases

2 purchases

Zen Timer.

Subscriptions1
  • Premium - 6 months14 Days trial$4.996 Months
One-time1
  • Pro Version$49.99
4 purchases

iSera Mentor

Subscriptions4
  • iSera Plus$4.991 Month
  • iSera Premium$9.991 Month
  • iSera Plus7 Days trial$49.991 Year
Show 1 more
  • iSera Premium7 Days trial$79.991 Year

Questions

Is Zen Timer. free?
Zen Timer. is free to download, with in-app purchases available.
Is iSera Mentor free?
iSera Mentor is free to download, with in-app purchases available.
Do Zen Timer. or iSera Mentor have ads?
Zen Timer. shows ads; iSera Mentor does not.
Which is updated more often, Zen Timer. or iSera Mentor?
Zen Timer. ships an update every 11 months, and iSera Mentor every 2 weeks. Most recently, Zen Timer. was updated on September 25, 2026 and iSera Mentor on October 3, 2026.

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