Comparison

Stack|自己投資アプリ vs Predy

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

Head to head
About

Stack|自己投資アプリ

Features
Read full description

自己投資にハマるための今ままでにないプラットフォーム

About

Predy

This app helps you overcome procrastination and build consistent work habits. It focuses on making starting easy, keeping motivation high, and visualizing your progress. Designed for those who struggle with task management, it turns effort into visible achievement.

Highlights
  • Project-based task management
  • Work tracking with timers and Pomodoro
  • StudyWithMe focus mode
  • AutoPilot for easy task initiation
  • Streak bonuses and productivity rankings
  • Progress analytics and prediction training
  • Goal estimation and feedback
Features
Read full description

Predy is a study timer and planner that helps you start studying, stay consistent, and make your progress visible. Use a study timer, Pomodoro, stopwatch, or manual entry to track learning time and build a routine that lasts. In Predy, goals are organized as projects, with tasks and work logs contained within them. Tasks can be managed by project, priority, deadline, and estimated time, preventing work from becoming scattered. Because all work logs are tied to projects, progress accumulates automatically, making it easy to see where you stand. Estimating required time in advance also helps users realistically understand what it will take to reach deadlines, reducing failed plans. The first problem Predy tackles is “not being able to start.” Work tracking supports Timer, Pomodoro, Stopwatch, and manual entry, allowing flexible use depending on the task and mental state. StudyWithMe mode further lowers the barrier by creating a focus-friendly atmosphere with immersive visuals and ambient sounds. On days when starting feels hardest, AutoPilot is especially effective. With one tap, a 2-minute timer begins alongside a simple starter action, such as tidying your desk. After that, you naturally move into a focused 20-minute session. This uses behavioral activation—you don’t start because you’re motivated; you get motivated because you started—minimizing resistance and building momentum naturally. Predy is also designed to make you want to continue. Daily login and task completion bonuses grow with streaks, while rankings visualize productivity through multiple metrics such as project completions, focus level, efficiency, total work time, and consecutive days. Even “just one minute today” feels meaningful, often leading to longer sessions. Consistency is supported not by grit, but by structure. Progress is clearly visible through analytics that show work volume and time for today, this week, and this month. Seeing effort accumulate creates a sense of achievement and naturally leads to “Maybe I’ll do a little more.” Predy’s core differentiator is Prediction. Before working, users estimate how long a task will take and compare it with the actual result. Feedback at project completion helps clarify why estimates were off. Repeating this process improves planning accuracy, reducing deadline overruns. Predy doesn’t just manage tasks—it trains how to plan. Predy isn’t only for your best days. It’s for people who tried task management apps many times and couldn’t keep going. By lowering the barrier to starting, creating reasons to continue, and leaving visible proof of effort, Predy helps users try again. From “I have to push myself” to “I’ve already moved forward.” Predy is designed to make that state part of everyday life. Privacy Policy → https://team-app-dev.com/predy/privacy/ Terms of Use → https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Stack|自己投資アプリ4 screens
Predy4 screens

Verdict

The call

The clearest difference is in-app purchases: Stack|自己投資アプリ at none against Predy's 3. Stack|自己投資アプリ also leads on ads (none vs shown). Predy's advantage is update cadence (every 3 days vs every 10 days). On price, 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. Predy sells 3 in-app purchases, starting at $4.39 per month. Stack|自己投資アプリ asks for nothing beyond the download.

UpkeepUpdate frequency

Stack|自己投資アプリ ships an update every 10 days, Predy every 3 days. The most recent releases landed on September 28, 2026 and September 20, 2026 respectively.

Scorecard3 real differences · 7 level
Stack|自己投資アプリ versus Predy: the parameters behind the verdict, then further details
ParameterStack|自己投資アプリPredy
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 10 daysEvery 3 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS17.017.0
Further details — not scored
Size41 MB339 MB
Age rating17+4+
DeveloperNagato KadoyaGO SHIMIZU

In-app purchases

None

Stack|自己投資アプリ

No in-app purchases

3 purchases

Predy

Subscriptions2
  • Predy Premium7 Days trial$4.391 Month
  • Predy Premium7 Days trial$36.491 Year
One-time1
  • Predy$53.99

Questions

Is Stack|自己投資アプリ free?
Stack|自己投資アプリ is free to download, with no in-app purchases.
Is Predy free?
Predy is free to download, with in-app purchases available.
Do Stack|自己投資アプリ or Predy have ads?
Predy shows ads; Stack|自己投資アプリ does not.
Which is updated more often, Stack|自己投資アプリ or Predy?
Stack|自己投資アプリ ships an update every 10 days, and Predy every 3 days. Most recently, Stack|自己投資アプリ was updated on September 28, 2026 and Predy on September 20, 2026.

Other comparisons