Comparison

Elementium vs R2R

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

Head to head
About

Elementium

Access comprehensive information on every element of the periodic table. Explore detailed data, visualize trends, and utilize a built-in solubility calculator. Perfect for students and professionals needing quick, accurate chemical data.

Highlights
  • Detailed element information
  • Interactive periodic table
  • Dynamic filtering and trend visualization
  • Solubility calculator
  • Element image library
  • Bohr model visualizations
  • Home screen widgets
Features
Read full description

The premiere periodic table app for iPhone, iPad, and Apple TV. Quickly reference any element and all the information you need. Search for elements by on classification, phase, orbital, mass, or number. Dynamic filters help you understand periodic trends, like electronegativity, at a glance. Dive even deeper to get standard, frequently-used data points such as mass, electronegativity, radius, radioactivity, electron configuration, and more. LEARN Each element prominently features: • Symbol, name, and number • Atomic mass • Electronegativity • Electron configuration • Atomic radius • Melting and boiling points • Year of discovery • State at STP • Radioactivity Elements are also accompanied by discussions on its uses, discovery, and more. You can quickly find more information and publications about each element via links to Wikipedia, Science Direct®, and the American Chemical Society®. EXPLORE The periodic table is laid out in a clear, concise manner that adapts to the size of your screen. No more squinting at blurry images of the periodic table from web searches. Beautiful color-coding helps you quickly distinguish element classifications, phases at STP, electronegativity, and atomic radius. Trends and filtering help students who are learning chemistry to visualize patterns. SOLUBILITY CALCUALTOR A built in solubility calculator* answers all your, "is this soluble in that", questions. Just specify a solvent and a solute to check their compatibility. A solubility lookup table is also available for cross-referencing multiple combinations. VISUALIZATIONS See beautiful depictions of elements from raw to processed, and in other forms. The extensive library of images help you understand what your lab samples should look like, or may be helpful to students learning about chemistry.* SEARCH Search for elements by name, symbol, mass, or number from within Elementium™ or via Spotlight. Results are shown directly on the periodic table. Need faster access to element information? Search directly from Spotlight on the lock screen or home screen of your device. BOHR MODELS Animated Bohr models for each element help visualize how electrons are oriented around the nucleus.* WRITE & REPORT Academics and students writing reports and using data frequently in the classroom or the lab can simply tap on an aspect of an element to export its information.* HOME SCREEN WIDGETS Add the Periodic Table widget to your home screen for quick and easy reference to the Periodic Table. Or, try out the "random element" widget which is useful for students. ADDITIONAL NICE THINGS • Custom app icons • Set temperature and atomic radius to your preferred units • Search Spotlight for elements • Thoughtfully developed with accessibility in mind • A subscription is totally optional • No account required • Privacy focused (no tracking, no data collection) ------- ION Subscription Notice Subscription prices vary by duration and may vary by location. Subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled within 24-hours before the end of the current period. You can cancel anytime with your iTunes account settings. Manage your subscriptions in Account Settings after purchase. Privacy Policy: https://spencer-software.com/elementium/privacy Terms of Service: https://spencer-software.com/elementium/tos ------- *Requires in-app purchase. Elementium™ is a trademark of Samuel Spencer.

About

R2R

Learn and practice organic chemistry functional groups with interactive lessons and timed challenges. This app is designed for A-Level Chemistry students to prepare for exams and competitions.

Highlights
  • Learn functional groups
  • Practice with R-Groups
  • Timed challenges
  • Review different groups
  • Prepare for exams
Read full description

Put the Fun in Functional Groups with Prof. Rudi Rabbit! Aimed at those studying ALevel Chemistry, this app is designed to help you learn the different functional groups that may come up in your examinations or extension competitions. Use the 'Learn' screen to review the different groups and how you tell them apart, 'Practice' with different R-Groups and then 'Play' and try and beat the professor under timed conditions. Once you have beaten the professor then you are ready for some of Race to Revise's other organic synthesis games.

Screenshots

Elementium4 screens
R2R4 screens

Verdict

The call

The clearest difference is in-app purchases: R2R at none against Elementium's 9. R2R also leads on iOS requirement (9.0 vs 16.1). Elementium's advantage is update cadence (every 3 weeks vs every 5 months) and ratings volume (602 vs 129). On price, rating, review sentiment and ads 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. Elementium sells 9 in-app purchases, starting at $1.99 per month. R2R asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Elementium against 4.7 for R2R. Both are backed by a comparable volume of ratings — 602 and 129 respectively. Written reviews split almost evenly too, at 75% and 75% positive.

UpkeepUpdate frequency

Elementium ships an update every 3 weeks, R2R every 5 months. The most recent releases landed on October 20, 2026 and October 22, 2026 respectively.

Scorecard5 real differences · 5 level
Elementium versus R2R: the parameters behind the verdict, then further details
ParameterElementiumR2R
PriceFreeFree
Rating4.6 (602 ratings)4.7 (129 ratings) — better
Positive reviews75.0% of reviews75.0% of reviews
Number of ratings602 — better129
Update frequencyEvery 3 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, Apple TViPhone, iPad, iPod
Requires iOS16.19.0 — better
Further details — not scored
Size752 MB57 MB
Age rating4+4+
DeveloperSamuel SpencerJames Styles

Customer experience

Elementium

All ratings576 ratings
Positive91.5%
Neutral3.3%
Negative5.2%
Written reviews32 reviews
Positive75.0%
Neutral6.3%
Negative18.8%

R2R

All ratings124 ratings
Positive93.5%
Neutral4.8%
Negative1.6%
Written reviews8 reviews
Positive75.0%
Neutral25.0%
Negative0.0%

Bugs and requests

Elementium

Reported bugs

5 issues
  • App crashes on startup and when tapping elements
  • Crashes on older iOS devices and iPod Touch
  • Molar mass not visible in iPhone landscape orientation
  • Intrusive purchase prompt that's difficult to dismiss
  • Rating request spam appearing too early in user experience

Requested features

5 requests
  • Element images and visual representations
  • One-time purchase option instead of subscription
  • Zoom out to view entire periodic table at once
  • Better display of molar mass on iPhone in landscape mode
  • More detailed information and content

R2R

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

Elementium

Subscriptions4
  • ION, 1 month1 Month trial$1.991 Month
  • ION, 3 Months3 Days trial$3.993 Months
  • ION, 6 months$5.996 Months
Show 1 more
  • ION, 1 year$9.991 Year
One-time5
  • Export Data$0.99
  • Bohr Models$1.99
  • Advanced Sorting$2.99
Show 2 more
  • Visual Elements$3.99
  • Advanced Tools$4.99
None

R2R

No in-app purchases

Questions

Is Elementium free?
Elementium is free to download, with in-app purchases available.
Is R2R free?
R2R is free to download, with no in-app purchases.
Which has better reviews, Elementium or R2R?
R2R is rated higher. Elementium averages 4.6 out of 5 from 602 ratings, while R2R averages 4.7 from 129 ratings.
Do Elementium or R2R have ads?
Neither Elementium nor R2R shows ads.
Which is updated more often, Elementium or R2R?
Elementium ships an update every 3 weeks, and R2R every 5 months. Most recently, Elementium was updated on October 20, 2026 and R2R on October 22, 2026.

Other comparisons