Comparison

Periodic vs DrPhos' Stoichiometry

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

Head to head
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!

About

DrPhos' Stoichiometry

This tool simplifies solving chemical reaction problems by allowing users to input balanced equations and identify known and unknown compounds. It instantly calculates moles and mass, assisting students with various stoichiometry challenges.

Highlights
  • Mole, mass, and volume conversions
  • Balanced chemical equation support
  • Compound selection
  • Limiting reactant detection
  • High school and college chemistry focus
Features
Read full description

Solve Stoichiometry Problems Fast The DrPhos Stoichiometry Tool makes solving chemical reaction problems simple. Enter a balanced equation, choose known and unknown compounds, and instantly calculate moles and mass. Designed for chemistry students, this tool walks you through the stoichiometric process with clean visuals and intelligent logic. Whether you’re solving basic mole ratios or limiting reactant problems, this app keeps your work fast, accurate, and focused. Features: • Supports mole, mass, and volume conversions • Works with balanced chemical equations • Select known and unknown compounds easily • Built-in limiting reactant detection • Ideal for high school and college chemistry Use this app on its own or unlock it within the full DrPhos GenChem Helper suite to streamline your chemistry toolkit.

Screenshots

Periodic4 screens
DrPhos' Stoichiometry4 screens

Verdict

The call

The clearest difference is in-app purchases: Periodic at none against DrPhos' Stoichiometry's 11. Periodic also leads on iOS requirement (15.1 vs 17.2). DrPhos' Stoichiometry's advantage is price ($0.99 vs $1.99). On update cadence, 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

Periodic costs $1.99 and DrPhos' Stoichiometry $0.99 up front. DrPhos' Stoichiometry sells 11 one-off in-app purchases. Periodic asks for nothing beyond the download.

UpkeepUpdate frequency

Periodic ships an update every 5 weeks, DrPhos' Stoichiometry every 3 weeks. The most recent releases landed on August 16, 2026 and September 20, 2026 respectively.

Scorecard3 real differences · 6 level
Periodic versus DrPhos' Stoichiometry: the parameters behind the verdict, then further details
ParameterPeriodicDrPhos' Stoichiometry
Price$1.99$0.99 — better
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 5 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Paid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better17.2
Further details — not scored
Size31 MB15 MB
Age rating4+4+
DeveloperOm Prakash ChapagainMonte L Helm

In-app purchases

None

Periodic

No in-app purchases

11 purchases

DrPhos' Stoichiometry

One-time11
  • Significant Figures Counter$0.99
  • Science Calculator$0.99
  • Quadratic Equation Solver$0.99
Show 8 more
  • Kinetics$0.99
  • Molar Mass Calculator$0.99
  • General Chemistry Naming$0.99
  • Ionic Compound Builder$0.99
  • Solution Concentrations$0.99
  • Reaction Balancer$0.99
  • pH Calculator$0.99
  • Stoichiometry$0.99

Questions

Is Periodic free?
Periodic costs $1.99, with no in-app purchases.
Is DrPhos' Stoichiometry free?
DrPhos' Stoichiometry costs $0.99, and also offers in-app purchases.
Do Periodic or DrPhos' Stoichiometry have ads?
Neither Periodic nor DrPhos' Stoichiometry shows ads.
Which is updated more often, Periodic or DrPhos' Stoichiometry?
Periodic ships an update every 5 weeks, and DrPhos' Stoichiometry every 3 weeks. Most recently, Periodic was updated on August 16, 2026 and DrPhos' Stoichiometry on September 20, 2026.

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