Comparison

Chemical Solution Simple vs TOEFL Practice | Test

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

Head to head
About

Chemical Solution Simple

This app assists in preparing chemical solutions through dissolution and dilution. It calculates moles, molar masses, required solute weights, and starting solution volumes, supporting various concentration units.

Highlights
  • Solution preparation by dissolution
  • Solution preparation by dilution
  • Mole calculation
  • Molar mass analysis
  • Required solute weight calculation
  • Starting solution volume calculation
  • Supports Molar, mM, uM, g/l, mg/l units
Features
Read full description

Chemical Solution Simple helps in preparation of chemical solution by dissolution of solid solute or by dilution of existing solution and in finding of moles, Molar masses, required weights of solutes and volumes of starting solutions. Supported concentration units are Molar (M), mM, uM, g/l, mg/l. Touch the units field to change the units in the aformentioned order. The app includes Molar Mass Analyser. Tap on arrow in the Mw field initiates analysis of chemical formula in the component field and set the value to Mw field. No charge values should be used. Valid examples: Mg(HCO3)2, CaCl2.2H2O, CaCl2*2H2O, (NH4)2Fe(SO4)2.6H2O, Mg(H2PO4)2, C6H12O6. Analyser is case sensitive. Application assigns dot as a decimal separator. For further details please refer to http://www.volard.wordpress.com

About

TOEFL Practice | Test

This app offers comprehensive preparation for the TOEFL exam, integrating listening, speaking, reading, and writing practice. It features AI-powered grammar and essay correction, along with real-time pronunciation assessment to help users improve their English skills and achieve high scores.

Highlights
  • English listening practice
  • Real-time speaking assessment
  • Smart AI grammar correction
  • Intelligent essay correction
  • Comprehensive TOEFL practice
Features
Read full description

TOEFL Preparation, Journeying with You — Your Professional TOEFL Learning Companion Facing the challenges of the TOEFL exam, every student seeks the most professional and comprehensive preparation support. This is precisely the mission and purpose of our app. Tailored specifically for TOEFL candidates, we offer an all-in-one English learning tool that integrates listening, speaking, reading, and writing, aimed at providing the most effective preparation experience. Key Features: English Listening Practice: We offer a wide range of listening materials to enhance your comprehension skills, making understanding English no longer a daunting task. Real-time Speaking Assessment: Just follow a sentence in English, and our intelligent scoring system will automatically evaluate the accuracy of your pronunciation, pinpointing which words or phonemes need improvement, aiding you in precise pronunciation correction. Smart AI Grammar Correction: Input an English sentence, and our AI will instantly detect and highlight any grammatical errors, providing detailed explanations, helping you learn the correct grammar usage. Intelligent Essay Correction: Submit your English essays, and our system will critique them thoroughly, just like a teacher, providing constructive feedback and suggestions for improvement. Comprehensive TOEFL Practice: Designed specifically for the TOEFL exam, covering listening, speaking, reading, and writing for a holistic training approach, making it an ideal choice for TOEFL preparation. Our application is not only a powerful tool for your TOEFL preparation but also your secret weapon to achieving high scores. We understand the difficulties and pressures of TOEFL preparation, so we are fully committed to providing the most personal and efficient learning experience. Download now and let's journey together towards high scores in TOEFL! Hello TOEFL Membership Agreement https://docs.qq.com/doc/DVW5yS3Zud0NYZFVq Hello TOEFL Privacy Policy https://docs.qq.com/doc/DVUx2Rndsc2RiQWZL Hello TOEFL User Agreement https://docs.qq.com/doc/DVXBiSk1qaGVTZ1BW

Screenshots

Chemical Solution Simple4 screens
TOEFL Practice | Test4 screens

Verdict

The call

The clearest difference is price: TOEFL Practice | Test at Free against Chemical Solution Simple's $2.99. TOEFL Practice | Test also leads on update cadence (every 3 weeks vs every 3 months) and device support (4 vs 2). Chemical Solution Simple's advantage is in-app purchases (none vs 3). On rating, review sentiment, ratings volume 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

TOEFL Practice | Test is free to download; Chemical Solution Simple costs $2.99 up front. TOEFL Practice | Test sells 3 in-app purchases, starting at $29.99 per 3 months. Chemical Solution Simple asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Chemical Solution Simple against 5.0 for TOEFL Practice | Test. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Chemical Solution Simple ships an update every 3 months, TOEFL Practice | Test every 3 weeks. The most recent releases landed on October 10, 2026 and October 8, 2026 respectively.

Scorecard6 real differences · 4 level
Chemical Solution Simple versus TOEFL Practice | Test: the parameters behind the verdict, then further details
ParameterChemical Solution SimpleTOEFL Practice | Test
Price$2.99Free — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings11
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS17.015.0 — better
Further details — not scored
Size1 MB126 MB
Age rating4+4+
DeveloperRoman Volinsky志桂 李

Customer experience

Chemical Solution Simple

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

TOEFL Practice | Test

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Chemical Solution Simple

No in-app purchases

3 purchases

TOEFL Practice | Test

Subscriptions3
  • VIP$29.993 Months
  • EliteAccess Monthly$29.991 Month
  • EliteAccess Year$69.991 Year

Questions

Is Chemical Solution Simple free?
Chemical Solution Simple costs $2.99, with no in-app purchases.
Is TOEFL Practice | Test free?
TOEFL Practice | Test is free to download, with in-app purchases available.
Which has better reviews, Chemical Solution Simple or TOEFL Practice | Test?
Chemical Solution Simple and TOEFL Practice | Test are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Chemical Solution Simple or TOEFL Practice | Test have ads?
Neither Chemical Solution Simple nor TOEFL Practice | Test shows ads.
Which is updated more often, Chemical Solution Simple or TOEFL Practice | Test?
Chemical Solution Simple ships an update every 3 months, and TOEFL Practice | Test every 3 weeks. Most recently, Chemical Solution Simple was updated on October 10, 2026 and TOEFL Practice | Test on October 8, 2026.

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