Comparison

Depth vs Smart Diary

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

Head to head
About

Depth

Measure the depth of wells, cliffs, and other vertical drops by dropping an object and listening for the impact. It also calculates the speed of a falling object in real-time.

Highlights
  • Measure well and cliff depths
  • Calculate freefall speed
  • Real-time drop analysis
  • Uses sound for measurement
Features
Read full description

Well, cliffs, skyscrapers... Drops something and you hear when it touches the ground. iPhone will say the depth of the well, cliffs or other. If you rely on sight. the program displayes depth and speed, at the moment, of the body in freefall.

About

Smart Diary

This student planner helps organize your academic life by tracking homework, tests, and absences. It includes tools for time management, grade tracking, and setting academic goals. Customize your experience with themes and access advanced features through an in-app purchase.

Highlights
  • Add homework, tests, and notes
  • Manage absences and count by type
  • Time management organizer
  • Track and manage grades
  • Set academic goals
  • Customizable timetable
  • Notes with text formatting
Features
Read full description

Smart Diary is a complete student planner / school diary, with this application you can: • add homework, tests and free notes on the Diary • manage your absences • use the Organizer, a tool that help you managing the time dedicated to tasks Upgrading to the Premium version (through in-app purchase) you will be able to: • manage your weekly timetable • manage your grades, set goals • customize the app appearance with themes Here are all the functions. 1. Subjects and Timetable • For every subject you can choose a color, add the Professor, and other notes • Set the timetable selecting the subject and the lesson type. You can customize the timetable changing the maximum hours, the end of the week, set the hour in the 'hour:minute' format • Multiple Timetables • Print your weekly timetable 2. Tasks and Absences • Mark a task as important or done, set the required time, set a reminder, associate an emoji • View your tasks in different ways; classic diary with pages or list grouped by day • Reorder the tasks to better organize the Diary, just tap and hold on a task • Mark absences. Count absences by type and period • Memos section 3. Time Management • Organizer - a powerful but simple tool to schedule tasks, it allow you to specify the required time and schedule the task over multiple days. Calculation of the daily work, swipe and consult the days with the bar chart • Time - a pure time management tool. Create work session with customized countdowns 4. Grades Management • Multiple evaluation systems supported (numeric 0 - 10, alphabetical A - F, etc) • Grades chart and filter by grade type / period • Check your general average 5. Goals • Set a grade as a goal, by subject and grade type • Calculate the required grade to reach your goal or the sufficiency 6. Notes • Dedicated editor to write notes • Text formatting in bold, italic, highlighted • History of the previous text reviews 7. General features and customization • Set a reminder notification for tasks, you can select a rapid reminder or a specific date • 3D Touch Shortcut by pressing deeply on the app icon • Customize the appereance of the Diary section with themes 8. Widget and backup • Widget with tasks overview for the following day, timetable widget • Data and Preferences Backup on iCloud 9. Apple Watch • Add new tasks dictating in natural language • View tasks and timetable • Mark a task as done The app is free with limitations, you can unlock all the features through in-app purchase.

Screenshots

Depth4 screens
Smart Diary4 screens

Verdict

The call

The clearest difference is price: Smart Diary at Free against Depth's $0.99. Smart Diary also leads on rating (4.8 vs 1.0) and update cadence (every 2 months vs every 21 months). Depth's advantage is in-app purchases (none vs 1). On 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

Smart Diary is free to download; Depth costs $0.99 up front. Smart Diary sells 1 one-off in-app purchase. Depth asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Smart Diary holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Smart Diary has 42 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Depth's written reviews are positive against 66% of Smart Diary's.

UpkeepUpdate frequency

Depth ships an update every 21 months, Smart Diary every 2 months. The most recent releases landed on August 22, 2026 and October 19, 2026 respectively.

Scorecard7 real differences · 3 level
Depth versus Smart Diary: the parameters behind the verdict, then further details
ParameterDepthSmart Diary
Price$0.99Free — better
Rating1.0 (1 ratings)4.8 (42 ratings) — better
Positive reviews50.0% of reviews65.9% of reviews — better
Number of ratings142 — better
Update frequencyEvery 21 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS11.0 — better12.0
Further details — not scored
Size73 MB23 MB
Age rating4+4+
DeveloperPietro MassiminoMatteo D'Ignazio

Customer experience

Depth

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Smart Diary

All ratings42 ratings
Positive95.2%
Neutral2.4%
Negative2.4%
Written reviews44 reviews
Positive65.9%
Neutral18.2%
Negative15.9%

In-app purchases

None

Depth

No in-app purchases

1 purchases

Smart Diary

One-time1
  • Premium version$2.99

Questions

Is Depth free?
Depth costs $0.99, with no in-app purchases.
Is Smart Diary free?
Smart Diary is free to download, with in-app purchases available.
Which has better reviews, Depth or Smart Diary?
Smart Diary is rated higher. Depth averages 1.0 out of 5 from 1 ratings, while Smart Diary averages 4.8 from 42 ratings.
Do Depth or Smart Diary have ads?
Neither Depth nor Smart Diary shows ads.
Which is updated more often, Depth or Smart Diary?
Depth ships an update every 21 months, and Smart Diary every 2 months. Most recently, Depth was updated on August 22, 2026 and Smart Diary on October 19, 2026.

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