Comparison

WhatWhere? vs Periodic

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

Head to head
About

WhatWhere?

Identify unknown items, locations, and concepts within an image using on-device AI. This app analyzes pictures privately using your device's built-in AI hardware, working even in airplane mode without sending data to external servers.

Highlights
  • On-device AI analysis
  • Works offline
  • Identifies items in images
  • Analyzes locations
  • Recognizes key concepts
  • Uses device's AI hardware
Read full description

Identify unknown items, locations and key concepts of an image. You'll get different results from the various models that are used to identify your image. This App runs AI ON build in AI hardware on THE PHONE! (so it works in Airplane Mode). It does not use the network or any servers to analyze data and doesn't send the picture to a giant server in the sky like most other apps. Just sayin'. Take a picture with your camera and the machine learning models will identify the key subject in the picture! This is an example of Apple's staggeringly fantastic LOCAL AI on your device!!! Great new Core ML technology. Enjoy! This great little App lets you use the camera or library to select a picture and then lets the iPhone or iPad analyze the picture with pre-trained Machine Learning models. All private. All on the phone. Never talks to anything. Ever.

About

Periodic

Features
Read full description

The PeriodicTableElements is an elegant app that is interactive and fun. Easy to use, easy to understand, simple and effective. It shows the periodic table of elements in variety of ways 1) Classic grid with name that is color coded. You can configure it to look however you like. 2) Visually appealing electron distribution. 3) Visually appealing Lewis dot structure. 4) List that can be sorted based on different element properties like group, period, category etc. These awesome periodic tables can be shared by simple double click anywhere on the table. It is possible to copy the periodic table diagrams as high quality SVG xml. Drag your finger on the periodic table canvas to update elements automatically or tap on an element to see more details. Tap on an element and all the rest of the related elements are highlighted. Details of a selected element is shown in a beautifully drawn animated element. Tap on the animated element and you will see more details that can also be shared. Tapping on the list element will navigate you to a page that shows details of the element. It automatically saves your hard work locally on your device so you can come back and pick up from where you left off as your great effort will not be lost. This is a perfect app if you are a student learning chemistry. This is an app for all student groups. From high school to college to university students. Be creative. Enjoy the app!

Screenshots

WhatWhere?4 screens
Periodic4 screens

Verdict

The call

The clearest difference is ads: WhatWhere? at none against Periodic's shown. Periodic's advantage is update cadence (every 5 weeks vs every 100 months) and iOS requirement (15.1 vs 17.0). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

WhatWhere? ships an update every 100 months, Periodic every 5 weeks. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

Scorecard3 real differences · 6 level
WhatWhere? versus Periodic: the parameters behind the verdict, then further details
ParameterWhatWhere?Periodic
PriceFreeFree
Rating2.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 100 monthsEvery 5 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size185 MB35 MB
Age rating4+4+
DeveloperRobert L ZimmelmanOm Prakash Chapagain

In-app purchases

None

WhatWhere?

No in-app purchases

None

Periodic

No in-app purchases

Questions

Is WhatWhere? free?
WhatWhere? is free to download, with no in-app purchases.
Is Periodic free?
Periodic is free to download, with no in-app purchases.
Do WhatWhere? or Periodic have ads?
Periodic shows ads; WhatWhere? does not.
Which is updated more often, WhatWhere? or Periodic?
WhatWhere? ships an update every 100 months, and Periodic every 5 weeks. Most recently, WhatWhere? was updated on October 6, 2026 and Periodic on October 12, 2026.

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