ShapeInfo Plus vs Memo in the Sky
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ShapeInfo Plus
This app calculates lengths, angles, and areas for various geometric shapes. It supports a wide range of 2D and 3D shapes, making it a handy tool for engineers and students.
- Calculate lengths, angles, and area
- Calculate volume for 3D shapes
- Supports various 2D and 3D shapes
- User-friendly input for calculations
- Immediate calculation results
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Feature The ShapeInfo is useful application for calculating shape lengths, angles and area. You can get some calculated lengths and angles of the shape from choosing and entering values in the boxes upon the orange points. How to use 1. Choosing shape from the list. 2. Enter the value to the box upon the orange points. You can change the formation of the orange points by "NEXT" button (orange color) or tapping orange/gray point near the box that you are going to enter the value. 3. You can get calculated values of the shape, immediately after entering values. Applications - For the software developer, the mechanical engineer, the dynamics engineer and the surveying engineer. - Study mathematics for high school students. Functions - Calculate lengths, angles and the area for the right triangle, the triangle, the sector, the circle and ellipse. - Calculate volume for the triangular pyramid, the triangular prism, the circular cone, circular cylinder and the sphere. Shapes - Right triangle - Triangle - Sector - Circle - Ellipse - Triangular pyramid - Triangular prism - Circular cone - Circular cylinder - Oblique cutting circular cylinder - Sphere Disclaimer Appsys does not accept responsibility for any loss, which may arise from reliance on the software or materials published on this site.
Memo in the Sky
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When something is done, you don't just delete it. You burn it. Things to do. Things to remember. Things you want kept in plain sight for a while. What you write becomes a wooden plank and floats in a blue sky. It stays there until you are finished with it. When you are, hold the plank under your finger. It smolders, catches fire, burns through, and falls away as ash. A checkbox turns grey. A line slips quietly off a list. That is not much of an ending. So the ending is the part I made large. Once it burns, nothing is left You burned it, so nothing remains. I chose burning rather than deleting because that needs no explanation. No history is kept of what you wrote or what you burned. What remains is in your own mind instead, clearly, for a while. That is how I meant it to work. This is a place for things you only need to hold briefly. Anything you will need to look back on later, write somewhere else. It connects to nothing No calendar. No reminders. No notifications. No due dates, no repeats, no tags, no sharing. If you need any of that, use an app that has it. This one is for people who find those things more of a nuisance than a help. Who want to feel only what their own hands did — wrote it, moved it, burned it — and nothing beyond that. There is almost no button Touch the empty sky and wait a moment. A plank appears. Touch a plank and hold still. It begins to burn. Pull a plank sideways, then move it up or down. The order changes. Double-tap a plank. You can rewrite it. The only things resembling buttons are the small wooden plank you press to commit what you have written, the × that lets you stop, and a small cloud that opens a guide. The cloud appears at the top right when the app opens, and otherwise stays out of sight above the screen. Pull the screen down and it comes back at any time. There is no sound No sound effects. This is something you may open in front of other people. Everything you feel comes through vibration. As the fire approaches, the trembling under your finger grows stronger. While it is still trembling, you can turn back. When it stops, you cannot. Nothing leaves your phone What you write is stored only on your iPhone. The app makes no network connection of any kind. No one, including me, can see what you wrote. iPhone only.
Screenshots
Verdict
The clearest difference is update cadence: Memo in the Sky at every 2 weeks against ShapeInfo Plus's every 6 months. ShapeInfo Plus's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price, ads and in-app purchases 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
ShapeInfo Plus costs $0.99 and Memo in the Sky $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ShapeInfo Plus ships an update every 6 months, Memo in the Sky every 2 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | ShapeInfo Plus | Memo in the Sky |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 4.6 (31 ratings) — better | — |
| Positive reviews | 65.5% of reviews | — |
| Number of ratings | 31 — better | — |
| Update frequency | Every 6 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 11 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Noriyasu Kutsuzawa | HARUHIKO ONO |
In-app purchases
ShapeInfo Plus
No in-app purchases
Memo in the Sky
No in-app purchases
Questions
Is ShapeInfo Plus free?
Is Memo in the Sky free?
Do ShapeInfo Plus or Memo in the Sky have ads?
Which is updated more often, ShapeInfo Plus or Memo in the Sky?
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