Comparison

PSiO vs Zen

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

Head to head
About

PSiO

Features
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This application presents the advantages of the PSIO device in the shape of a pair of glasses combining light & relaxation. This device is revolutionary because it offers for the first time a real support for the mind to be in full shape all year. Sessions are available for morning, afternoon and evening. The app is designed for PSIO ambassadors as it allows them to present the benefits of the PSiO effectively in order to bring their prospects to test the device quickly. It is possible to make an appointment immediately with an ambassador. The app also gives the opportunity to test the level of alertness before and after a PSIO session. Indeed, a section proposes a reaction time test.

About

Zen

Features
Read full description

Just Sit. Your Way. Nothing Else. A silent meditation timer with traditional bells. The sit is free. Optional short guided sits when just sitting is hard. Then silence. No ads, no streaks, no account. JUST SIT Sit on a cushion or chair. Eyes barely open, soft gaze. Feel your body, breath, and posture. No mantra, no goal. When thoughts come and go, just return to sitting. The benefits are real β€” a calm mind, more focus, more clarity, better sleep, less stress, more presence. They show up when you stop chasing them. YOUR WAY Just sit. Easier said than done. Just sitting can be brutal. Most people need a little guidance, and that detour is fine. Optional short guided sits β€” the Just Sit course, one idea at a time β€” then sit in silence. Or leave every optional feature off. Not a library of courses. Discover your way to just sit. NOTHING ELSE Everything you need to just sit is included, and stays free. A timer, bells, Watch, widgets. No ads, no streaks, no account to sit. The sit stays free. Always. Native on iPhone, iPad, and Apple Watch. Focus on what matters: just sit. HOW IT WORKS Open the app Β· pick a duration Β· sit. Beautiful bells, soundscapes, intervals, warmup and cooldown. If you want to look around: Welcome on first launch, then short guided sits for ordinary life. Nothing required. Explore at your own pace. WHY THIS EXISTS Hi, I'm Francis, a longtime Apple developer. I discovered regular meditation about 15 years ago. I suffer from PTSD, and meditation has helped me survive β€” more than once β€” when things fall apart. Meditation only clicked for me with a Zen just-sit practice. To get there I had to put in the time: other practices, sampling, trial and error, year after year of showing up to sit. I needed those 10,000 minutes on apps before I could stop searching and, in the end, just sit. Zen : Your Way is my way of giving back. A quiet timer. Optional guidance to nudge you toward just sitting. Nothing in the way of the sit itself. ON IPHONE AND IPAD β€’ Apple Watch companion β€” start sits and complications on your wrist β€’ Home Screen widgets and Live Activities

Screenshots

PSiO4 screens
Zen4 screens

Verdict

The call

The clearest difference is update cadence: Zen at every 2 days against PSiO's every 11 months. Zen also leads on device support (6 vs 3). PSiO's advantage is iOS requirement (9.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

PSiO ships an update every 11 months, Zen every 2 days. The most recent releases landed on September 16, 2026 and September 29, 2026 respectively.

Scorecard3 real differences Β· 3 level
PSiO versus Zen: the parameters behind the verdict, then further details
ParameterPSiOZen
PriceFreeFree
Update frequencyEvery 11 monthsEvery 2 days β€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro β€” better
Requires iOS9.0 β€” better17.0
Further details β€” not scored
Size25 MB25 MB
Age rating4+4+
DeveloperPsychomed.com SAFrancis Dierick

In-app purchases

None

PSiO

No in-app purchases

None

Zen

No in-app purchases

Questions

Is PSiO free?
PSiO is free to download, with no in-app purchases.
Is Zen free?
Zen is free to download, with no in-app purchases.
Do PSiO or Zen have ads?
Neither PSiO nor Zen shows ads.
Which is updated more often, PSiO or Zen?
PSiO ships an update every 11 months, and Zen every 2 days. Most recently, PSiO was updated on September 16, 2026 and Zen on September 29, 2026.

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