Comparison

Pockster StrongArm vs FastZen

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

Head to head
About

Pockster StrongArm

Measure your physiological state by testing your fine motor control. Hold your iPhone steady with your arm outstretched for one minute to pass the challenge. The app tracks your ability to maintain stillness against gravity and fatigue.

Highlights
  • Measure steady hand control
  • Test against gravity
  • Track physiological state
  • Challenge friends and colleagues
  • Simple, intuitive gameplay
Features
Read full description

Stress affects people on a very basic level. While for most casual activities the changes might not be as noticeable, it still contributes to the overall state of health. And if you are dependent on fine motor control (anybody make trips to the rifle range on a regular basis or play hard core video games?), you may find that simple stress can affect you more than you realize. Our nervous system and fine motor control state can be a good measure of our overall physiological state of being. It should not be surprising that our sense of control can vary each day depending on our health and outside influences. Now, thanks to the mechanical abilities of the iPhone, you can measure your current ability of steady control. The challenge is to simply hold your iPhone in your hand with your arm outstretched and steady. If you can do this easy sounding task for one minute, you pass the test. However, if your arm moves too much, the count starts over. And over. Once you raise your arm and have the phone in position, it will start announcing the count every five seconds. Until then, tones indicate that you do not yet have it level. Why level? Because that is the position that creates the greatest challenge with gravity. Sounds simple enough, but the iPhone senses slight movement that you may not be aware of making. After a few count resets, fatigue becomes a large factor in your success. Of course, there are some people who have a steady hand seemingly all the time, though few in number. If you are curious how you rank, one way to find out is to take the StongArm challenge. For an additional challenge, consider setting up a course to walk while trying to beat the clock. Simple movement adds another level of complexity to the process. You can also check out the state of your friends and colleagues Now, we do not condone the use of StrongArm to help win arguments, nor do we suggest use it to prove a point, but we are sure that you can find creative ways to use this capability. Thank you for looking at Pockster Strongarm!

About

FastZen

This app helps you manage your fasting schedule with customizable timers and reminders. It offers a recurring weekly routine, a timer that remembers your progress, and a clear view of your active fast. Review your history and track your streaks, all while keeping your data private on your device.

Highlights
  • Customizable fasting schedules
  • Recurring weekly routine setup
  • Live Activities for active fast tracking
  • Detailed fasting history and streaks
  • No account, ads, or server sync
  • Custom Week one-time purchase
Read full description

Follow your current fast and organize a week that fits your routine. Start or end your timer, adjust times and review your history. Rest days belong in your schedule: the plan should fit your life, not the other way around. The core timer is free. Custom Week is available as a one-time purchase, without a subscription. People who used FastZen before version 1.1.0 keep that access without paying. This is a tracking tool, not medical advice or a weight-loss promise.

Screenshots

Pockster StrongArm2 screens
FastZen4 screens

Verdict

The call

The clearest difference is review sentiment: FastZen at 100% against Pockster StrongArm's 0%. FastZen also leads on update cadence (weekly vs every 108 months). Pockster StrongArm's advantage is in-app purchases (none vs 3). On price, ads, 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. FastZen sells 3 one-off in-app purchases. Pockster StrongArm asks for nothing beyond the download.

UpkeepUpdate frequency

Pockster StrongArm ships an update every 108 months, FastZen weekly. The most recent releases landed on September 26, 2026 and October 7, 2026 respectively.

Scorecard4 real differences · 6 level
Pockster StrongArm versus FastZen: the parameters behind the verdict, then further details
ParameterPockster StrongArmFastZen
PriceFreeFree
Rating1.4 (5 ratings) — better—
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings5 — better—
Update frequencyEvery 108 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhoneiPhone, iPad — better
Requires iOS17.017.0
Further details — not scored
Size5 MB2 MB
Age rating4+4+
DeveloperGreg ChaffinsBenjamin Dupin

Customer experience

Pockster StrongArm

All ratings5 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

FastZen

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Pockster StrongArm

No in-app purchases

3 purchases

FastZen

One-time3
  • Coffee$0.99
  • Thanks$2.99
  • Support development$4.99

Questions

Is Pockster StrongArm free?
Pockster StrongArm is free to download, with no in-app purchases.
Is FastZen free?
FastZen is free to download, with in-app purchases available.
Do Pockster StrongArm or FastZen have ads?
Neither Pockster StrongArm nor FastZen shows ads.
Which is updated more often, Pockster StrongArm or FastZen?
Pockster StrongArm ships an update every 108 months, and FastZen weekly. Most recently, Pockster StrongArm was updated on September 26, 2026 and FastZen on October 7, 2026.

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