Formula Conversion vs Element OTG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Formula Conversion
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It is a formula conversion application. You can print a formula or a modified formula. You can save unmodified formulas to your phone's storage medium and then open it if necessary. Upgrading An application without an upgrade is limited to 24 formula conversions. If you want to convert the formula more than ten times, you must make an in-app purchase. Creating and opening a formula You can open the formula by clicking the first button on the toolbar. You can create a new formula using the symbols, symbols, numbers, and letters on the keyboard. You can change the font size of letters and symbols by pressing the "alp." Or "ALP." And "sym." Or "SYM." Buttons on the toolbar. If you wish, you can delete the characters by pressing the "del." Key. And use the arrows to move between the elements of the formula. Formatting the formula You can format the formula by first selecting the characters you want to change. The selection key is "Sel.", And you can then select by scrolling between the elements of the formula or by pressing the finger on the desired character. You can format the selected formula by pressing the second button on the toolbar from the back. You can change the font, font size, font, and font color Saving and printing the sample You can save the formula by pressing another button on the toolbar. Press the third button on the toolbar to print. If you want to delete the saved formulas, press the fourth button on the toolbar. Converting a formula When the formula is ready, you can publish parts of the formula. To publish part of a formula, select the item with the cursor. Press the fifth button on the toolbar to publish the formula. You can also print the converted formula by clicking the "Print" button. Zoom a formula If you want to increase or decrease the formula, press the third button on the back of the toolbar.
Element OTG
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• Complete Periodic Table - All 118 elements with detailed information • Interactive Learning Center - Chemistry quizzes and symbol practice • Smart Search & Filter - Find elements by name, symbol, or properties • Dark Mode Support - Choose light, dark, or follow system theme • Responsive Design - Perfect for phones, tablets, and desktops
Screenshots
Verdict
The clearest difference is in-app purchases: Element OTG at none against Formula Conversion's 1. Element OTG also leads on update cadence (monthly vs every 26 months). Formula Conversion's advantage is ads (none vs shown). 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
Both are free to download. Formula Conversion sells 1 one-off in-app purchase. Element OTG asks for nothing beyond the download.
Formula Conversion ships an update every 26 months, Element OTG monthly. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.
| Parameter | Formula Conversion | Element OTG |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 26 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.1 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Janek Soomets | Japality Limited |
In-app purchases
Formula Conversion
- Upgrade Formula Conversion$3.99
Element OTG
No in-app purchases
Questions
Is Formula Conversion free?
Is Element OTG free?
Do Formula Conversion or Element OTG have ads?
Which is updated more often, Formula Conversion or Element OTG?
Other comparisons
