DrPhos' pH Calculator vs Flashcards by SwiftStudy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DrPhos' pH Calculator
This tool instantly calculates pH, pOH, and ion concentrations for strong and weak acids and bases. It supports molarity and scientific notation, ensuring accurate results for general chemistry problems.
- Calculate pH, pOH, [H⁺], or [OH⁻]
- Handles strong and weak acids/bases
- Supports Ka and Kb values
- Built-in molarity and scientific notation
- Automatic pH + pOH = 14
- Clean, focused layout
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Easily Calculate pH, pOH, [H⁺], and [OH⁻] The DrPhos pH Calculator is a fast, reliable tool for solving acid-base problems in general chemistry. It supports both strong and weak acids and bases—automatically solving equilibrium expressions using the appropriate Ka or Kb values. Whether you’re converting between pH and concentration, calculating [H⁺], or just checking your work, this app provides accurate, instant results. Features: • Calculate pH, pOH, [H⁺], or [OH⁻] from any one value • Handles strong and weak acids/bases with Ka or Kb • Built-in support for molarity and scientific notation • Maintains pH + pOH = 14 automatically • Clean, focused layout with visual feedback Need more chemistry tools? Unlock additional features within the app or explore the full DrPhos GenChem Helper, which includes: • Significant Figures Counter • Molar Mass Calculator • Ionic Compound Builder • General Chemistry Naming Tool • Equation Balancer • Stoichiometry Solver • Solution Concentration Calculator • Integrated Rate Law Calculator • Scientific Calculator • Quadratic Equation Solver Unlock individual tools for $0.99 each—or get everything in the full GenChem Helper for just $9.99.
Flashcards by SwiftStudy
Create and study double-sided flashcards with text and visuals. Organize them into custom stacks and track your progress through four mastery levels. Study from anywhere on any device and build a consistent learning streak.
- Double-sided flashcards with text and visuals
- Organize cards into topic-based stacks
- Customizable stack designs
- Four mastery levels: New, In practice, Familiar, Mastered
- Cross-device study access
- Learning streak tracking
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Studying for a math exam? Memorizing that pesky chemical reaction formula for class? Or looking to impress your in-laws with some new Spanish vocabulary? Elevate your memory game with SwiftStudy, a flashcards app to memorize anything and test your knowledge in a rewarding way. With SwiftStudy you can: - Fill double-sided flashcards with words, visuals, definitions, formulae or whole poems and test your memory - Organize your flashcards into neat stacks on any topic - Customize your stacks to add a personal touch and stay engaged - Achieve mastery of your stacks with 4 levels of progression - from “New” through to “In practice”, “Familiar” and “Mastered” - Open your flashcards on any device to study from anywhere - Practice makes perfect - record your streak and stay on track The SwiftStudy app is an environmentally friendly way (no ink or paper involved ;) ) to test your memory and learn anything, one swipe at a time. Privacy policy https://www.swiftstudyapp.com/#/privacyPolicy
Screenshots
Verdict
The clearest difference is price: Flashcards by SwiftStudy at Free against DrPhos' pH Calculator's $0.99. Flashcards by SwiftStudy also leads on rating (4.6 vs 3.7) and update cadence (every 2 days vs every 10 days). On ads, in-app purchases, monetization model 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
Flashcards by SwiftStudy is free to download; DrPhos' pH Calculator costs $0.99 up front. DrPhos' pH Calculator sells 11 one-off in-app purchases and Flashcards by SwiftStudy sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Flashcards by SwiftStudy holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Flashcards by SwiftStudy has 31 ratings behind it against 3, so its average is the more settled of the two.
DrPhos' pH Calculator ships an update every 10 days, Flashcards by SwiftStudy every 2 days. The most recent releases landed on June 4, 2026 and June 1, 2026 respectively.
| Parameter | DrPhos' pH Calculator | Flashcards by SwiftStudy |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.7 (3 ratings) | 4.6 (31 ratings) — better |
| Positive reviews | — | 84.6% of reviews |
| Number of ratings | 3 | 31 — better |
| Update frequency | Every 10 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.2 | 17.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Monte L Helm | KD incubator UG (haftungsbeschrankt) |
Customer experience
DrPhos' pH Calculator
Flashcards by SwiftStudy
In-app purchases
DrPhos' pH Calculator
- Science Calculator$0.99
- Quadratic Equation Solver$0.99
- Significant Figures Calculator$0.99
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- Molar Mass Calculator$0.99
- Stoichiometry$0.99
- pH Calculator$0.99
- Ionic Compound Builder$0.99
- General Chemistry Naming$0.99
- Solution Concentrations$0.99
- Reaction Balancer$0.99
- Kinetics Calculator$0.99
Flashcards by SwiftStudy
- Flashcards - Coffee tip$3.99
- Drink Tip$9.99
- Lunch Tip$19.99
Questions
Is DrPhos' pH Calculator free?
Is Flashcards by SwiftStudy free?
Which has better reviews, DrPhos' pH Calculator or Flashcards by SwiftStudy?
Do DrPhos' pH Calculator or Flashcards by SwiftStudy have ads?
Which is updated more often, DrPhos' pH Calculator or Flashcards by SwiftStudy?
Other comparisons
