Comparison

Oovium vs zeitweise

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

Head to head
About

Oovium

This app is a novel calculation sandbox that combines the functionality of calculators, spreadsheets, concept maps, and programming languages into a single, visually intuitive interface. It aims to make complex computing abilities accessible to a wider audience through explicit visual representations.

Highlights
  • Calculation sandbox
  • Visual programming interface
  • Spreadsheet functionality (GridBub)
  • Concept mapping (TextBub)
  • Custom function definition (MechBub)
  • Object instances (InstBub)
Features
Read full description

Oovium makes my geek heart flutter. - Anne Wind This app is a thing of beauty. - W Smith Jr Wow I love this - OkeyMor57 22nd century calculating - bill knighton This will become Hari Seldon’s Prime Radiant some day. - nicked off Oovium is not an attempt to rehash old outdated inventions, but it subsumes much of their functionality. The calculator, spreadsheet, concept map, programming language: Oovium is all of them and it's none of them. Oovium is the first (but certainly not the last) of an entirely new class of app, the calculation sandbox. It has been made possible by the invention of the touch device and Oovium's clean, efficient and tactile interface, designed for such devices, has been part of its DNA since its inception. At its heart, Oovium aspires to make powerful, sophisticated and complex abilities (such as those currently available only to programmers) accessible to a wider audience. Oovium understands that increasing accessibility does not mean dumbing down an application by hiding complex functionality, it means making that complex functionality understandable by creating explicit visual representations for it. The workspace of Oovium is a two-dimensional surface known as the Aether. Upon this aether a user can place Bubbles. There are currently four types of bubbles: - InstBub is an instance of an object, usually a number, which in turn may be the result of an expression. - MechBub allows the user to define their own functions. - GridBub allows for a tabular arrangement of numbers and expressions similar to a spreadsheet. - TextBub is a node that can be connected to other TextBub nodes in order to create concept maps. These bubbles can be connected to each other in order to render sophisticated calculations in a visual (and aesthetic) way. Libraries of custom functions can be developed and included in other aethers when needed. The concept of Oovium has six different aspects; in its current form it contains only one of these six aspects. It is a highly ambitious project with much more planned, that hopes to empower users; it hopes to change the way people think about and work with their computers; in short, it hopes to change the world! Come help drive its functionality; come help make Oovium happen!

About

zeitweise

A full-screen timer designed for schools and meetings to help users focus on tasks. It offers intuitive controls, customizable presets, and visual cues for the end of a session. The pro version unlocks all features.

Highlights
  • Full-screen display
  • Adjustable time and start/pause
  • Customizable preset buttons
  • Visual 'Last Section' indicator
  • On-the-fly digit changes
  • Custom sound support (iPad only)
Features
Read full description

Time in sight. Distractions out. zeitweise is the fullscreen timer for classrooms, presentations, focused work, and anywhere else you need to see the time at a glance. The display makes the most of your screen: landscape by design, truly fullscreen, with no distracting controls. Just the time – big, clear, and easy to see. TAP INSTEAD OF HUNTING FOR BUTTONS No unnecessary buttons. The timer itself becomes the interface. • Tap the timer to start or stop. • Pinch out on the timer to enter true fullscreen mode. • Running out of time? Simply swipe to add extra minutes while the timer is running. MORE THAN A COUNTDOWN A one-time upgrade to zeitweise Pro adds features including: • Stopwatch • Interval timer with customizable work and break phases • Last Section to highlight the final phase of a countdown • Quick-access buttons for frequently used times That makes zeitweise just as useful for classroom activities and presentations as it is for studying, focus sessions, Pomodoro, or custom intervals. YOUR TIMER. YOUR DESIGN. A timer can look good, too. With a clean design, custom colors, and different fonts, zeitweise adapts to your style and your surroundings. • Color themes and custom colors • Different fonts • Adjustable timer size • Sounds for the end of the timer and the last section • Your own songs and audio files • Background music and ticking sounds A FREE TIMER – MAKE IT YOURS WITH PRO The classic fullscreen timer is free to use and always ad-free. zeitweise Pro adds the stopwatch, interval timer, advanced timer features, and the full range of customization and audio options. zeitweise Pro is a one-time purchase. No subscription. No ads. Whether you're in the classroom, giving a presentation, or working at your desk, zeitweise makes time visible – big, clear, and distraction-free.

Screenshots

Oovium4 screens
zeitweise4 screens

Verdict

The call

The clearest difference is in-app purchases: Oovium at none against zeitweise's 1. Oovium also leads on update cadence (monthly vs every 3 months) and ratings volume (5 vs 1). zeitweise's advantage is review sentiment (88% vs 65%). On price, rating, ads and device support 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. zeitweise sells 1 one-off in-app purchase. Oovium asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Oovium against 5.0 for zeitweise. That said, the two scores are not equally well evidenced: Oovium has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 65% of Oovium's written reviews are positive against 88% of zeitweise's.

UpkeepUpdate frequency

Oovium ships an update monthly, zeitweise every 3 months. The most recent releases landed on October 31, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 5 level
Oovium versus zeitweise: the parameters behind the verdict, then further details
ParameterOoviumzeitweise
PriceFreeFree
Rating5.0 (5 ratings)5.0 (1 ratings)
Positive reviews64.7% of reviews87.5% of reviews — better
Number of ratings5 — better1
Update frequencyMonthly — betterEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterPaid
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size11 MB65 MB
Age rating4+4+
DeveloperAepryus SoftwareKreismedienzentrum Rems-Murr

Customer experience

Oovium

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews68 reviews
Positive64.7%
Neutral13.2%
Negative22.1%

zeitweise

Written reviews8 reviews
Positive87.5%
Neutral12.5%
Negative0.0%

Bugs and requests

Oovium

Reported bugs

134 issues
  • Subscription not working
  • Crashes on launch on iPad
  • Links to Dropbox no longer work
  • Update killed everything, crashes on first screen
  • Crashes regularly
Show 129 more
  • App crashes at launch
  • Crashes and lost data before saving
  • Crashes a few times on first use
  • Struggled to get rid of help demo
  • Crashes regularly and feels like a work in progress
  • On-screen hints don't rotate with screen orientation
  • Crashes very frequently
  • Cannot get an aether saved
  • App exits and data is gone
  • Redone calculations multiple times
  • Crashes at launch
  • Launch, crash, launch, crash
  • Splash screen up for a fraction of a second
  • Crashed 5 times in 15 minutes
  • Crash-prone
  • Keeps crashing
  • Is it this update?
  • Forum has no entries since September
  • App still supported/under development?
  • Testing of releases could be better
  • Crashes on start
  • Unusable
  • Landscape mode reverts to portrait
  • Attempts to remove bubble cause a crash
  • Problem with online forum
  • Forum in its infancy
  • Background fades slowly
  • No audio feedback option
  • No statistical functions
  • Too difficult to move and link bubbles
  • Help documentation nonexistent
  • No array of numbers from spreadsheet or data table
  • No zoom
  • No scrollbars
  • Black background poor choice
  • No labels for boxes
  • No separation in box between references and numbers
  • Can't move a box once it's down
  • No visual sign of connections like lines
  • Needs more functions
  • Hard to use and get lost
  • Trippy version of Apple calc
  • Odd to use
  • Subscription is paid but app not usable
  • Mac app not clear, tutorial for iOS only
  • Subscription not automatically renewed
  • App crashes on launch
  • App hasn't been updated in a long time
  • App hasn't kept up with iOS changes
  • Dropbox links no longer work
  • Crashes on launch on iPad
  • Update killed everything
  • Crashes on first screen
  • Crashes regularly
  • Feels like a work in progress
  • Implementation not intuitive enough
  • On-screen instructions are clunky
  • On-screen hints don't rotate
  • Odd, unwieldy interface
  • Tutorial limited to making bubbles
  • Lacks comprehensive help files
  • Video-based information useless for some
  • Interface prevents features from being used
  • Crashes regularly
  • Tedium
  • Custom UI elements instead of standard iOS
  • Not ready for prime-time
  • No statistical functions
  • Too difficult to move and link bubbles
  • Help documentation basically nonexistent
  • No ability to use an array of numbers from a spreadsheet or data table
  • Can't save a calculation web and reuse it
  • Can't zoom in
  • Interface isn't intuitive
  • Can be quite frustrating to begin with
  • Crashes very frequently
  • Can't get an aether saved
  • Once the app exits, it's gone
  • Redone the same calculations 3 times
  • Crashes at launch
  • Launch, crash, launch, crash
  • Splash screen up for a fraction of a second
  • Crashed 5 times in the last 15 minutes
  • GUI needs to be slicker and more polished
  • Crashed a few times on first use
  • Struggled to get rid of the help demo
  • Certain aspects are portrait orientation only
  • In app documentation is terribly lacking
  • Crash-prone
  • Documentation could be much better
  • Managed to crash it 5 times in the last 15 minutes
  • Lack of stability and good documentation
  • Beta at best right now
  • Keeps crashing
  • Is it this update?
  • Could do with a comprehensive set of instructions
  • Forum has no entries since September
  • Is this app still supported/under development?
  • Testing of releases could be better
  • Crashes on start
  • Unusable
  • Landscape mode reverts to portrait
  • Attempts to remove the offending bubble also cause a crash
  • In-app help is very sketchy
  • Price seems high for what seems more like an alpha version than a stable release
  • Limited in-app help
  • Problems with online forum
  • Needs Undo / Redo
  • Needs centering
  • Needs cut/paste formula
  • Needs colors
  • Needs search and save
  • Background fades slowly
  • No audio feedback option
  • No statistical functions
  • Too difficult to move and link bubbles
  • Help documentation is basically nonexistent
  • No ability to use an array of numbers from a spreadsheet or data table
  • No zoom
  • No scrollbars
  • Black is a poor choice of background color
  • No labels for boxes
  • No separation in a box between references from other boxes and numbers entered directly
  • Can't move a box once it's down
  • No visual sign of connections like lines
  • Needs more functions
  • Hard enough to use and once it is set up you get lost quickly
  • Trippy version of the apple calc
  • Kinda odd to use

Requested features

75 requests
  • Better terminology
  • Vastly better documentation
  • Pay-once option
  • Lower purchase price ($3.99 or less)
  • Graphing and graphics capabilities
Show 70 more
  • Loop structure (other than recursion)
  • Overlay for logic and decision making flow chart shapes
  • Link logic operators to number flow
  • Undo feature
  • Random number generator function
  • Loop structure
  • Better handling of labeling and grouped items
  • Standard iOS interface elements
  • Undo/Redo functionality
  • Centering
  • Cut/paste formula
  • Colors
  • Search and save functionality
  • Fade background faster
  • Audio feedback option (beep-boop sounds)
  • Statistical functions
  • Ability to use array of numbers from spreadsheet or data table
  • Scrollbars for canvas navigation
  • Labels for boxes
  • Separation in box between references and numbers
  • Ability to move a box after placement
  • Visual sign of connections (lines)
  • More functions
  • Zoom functionality
  • Scrollbars
  • Labels for boxes
  • Separation in box between references and numbers
  • Ability to move a box once it's down
  • Visual sign of connections like lines
  • More functions
  • Save calculations and functions
  • Improve UI slickness and polish
  • Remove help demo after first use
  • Add cues and clues for using the interface
  • Use standard iOS interface
  • Add simple titles or tips for objects
  • Guidance on aether list usage
  • Create own objects and make calculations based on them
  • Improve stability and error handling/recovery
  • Improve documentation
  • Add strings, constants, and units
  • Fix landscape mode orientation issue
  • Add Undo/Redo
  • Add centering
  • Add cut/paste formula
  • Add colors
  • Add search and save
  • Fade background faster
  • Audio feedback option
  • Statistical functions
  • Ability to use array of numbers from spreadsheet or data table
  • Zoom functionality
  • Scrollbars
  • Labels for boxes
  • Separation in box between references and numbers
  • Ability to move a box once it's down
  • Visual sign of connections like lines
  • More functions
  • Save calculations and functions
  • Improve UI slickness and polish
  • Remove help demo after first use
  • Add cues and clues for using the interface
  • Use standard iOS interface
  • Add simple titles or tips for objects
  • Guidance on aether list usage
  • Create own objects and make calculations based on them
  • Improve stability and error handling/recovery
  • Improve documentation
  • Add strings, constants, and units
  • Fix landscape mode orientation issue

zeitweise

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Oovium

No in-app purchases

1 purchases

zeitweise

One-time1
  • zeitweise Pro$3.99

Questions

Is Oovium free?
Oovium is free to download, with no in-app purchases.
Is zeitweise free?
zeitweise is free to download, with in-app purchases available.
Which has better reviews, Oovium or zeitweise?
Oovium and zeitweise are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.
Do Oovium or zeitweise have ads?
Neither Oovium nor zeitweise shows ads.
Which is updated more often, Oovium or zeitweise?
Oovium ships an update monthly, and zeitweise every 3 months. Most recently, Oovium was updated on October 31, 2026 and zeitweise on November 2, 2026.

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