interChem vs OpenAthena
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
interChem
Calculate atomic and molecular masses, element percentages, and view a periodic table. Features dynamic font sizing and Split View support for iPad.
- Atomic and molecular mass calculation
- Element percentage calculation
- Periodic table with element classification
- Dynamic font size support
- Split View and drag-and-drop for iPad
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Version 2.5 - Interface and interaction logic redesigned. - The search bar have been moved to the bottom of the screen which is more reachable when holding your phone with one hand. - This app now supports iOS / iPadOS's dynamic font size, which can be adjusted in system preferences. - The settings page have been moved onto a pop up sheet which is clearer. interChem A simple app which allows you to enter a chemical and calculates its relative atomic or molecular mass, as well as the percentage of each element, and a well designed list of all periods of elements, with classification. Also supports Split View on iPadOS, as well as drag and drop.
OpenAthena
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OpenAthena™ is a project which allows consumer and professional drones to spot precise locations through their images. This is accomplished by combining their sensor metadata with digital elevation data to provide the instant location of what is being observed.
Screenshots
Verdict
The clearest difference is update cadence: interChem at every 3 weeks against OpenAthena's every 2 months. On price, ads, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
interChem ships an update every 3 weeks, OpenAthena every 2 months. Both last shipped on November 3, 2026.
| Parameter | interChem | OpenAthena |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 1 MB | 74 MB |
| Age rating | 4+ | 4+ |
| Developer | interfinity Limited | Robert Krupczak |
In-app purchases
interChem
No in-app purchases
OpenAthena
No in-app purchases
