Stoichiometry vs Sift Science
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Stoichiometry
This tool helps balance chemical reactions and calculate molar masses, moles, and actual masses of reactants and products. It supports various formula formats and can identify limiting reagents. Data can be sent to another app for gas phase calculations.
- Balance chemical reactions
- Calculate molar masses
- Determine moles and actual masses
- Identify limiting reagents
- Supports various formula formats
- Integrates with Gas Phase Stoichiometry app
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Stoichiometry is an ultimate tool for balancing chemical reactions, finding molar masses, moles and actual masses of reactants and products based on their chemical formulas, stoichiometric coefficients and any quantitative data provided, that available on Apple Store for iOSΒ and Mac . It is enough to provide initial or final (after reaction accomplishment) mass or moles of one of the reaction component, to calculate all required and obtained masses and moles of all components. If data is available for several components, then limiting reagent will be found based on reaction stoichiometry. Molecular formula format: charge or unpaired electrons (in free radicals), if exist, must be provided as well, separated by coma: Na,+ ; R,: ; SO4,2- . Application supports state indexes: (g), (s), (l), (aq) β all are lowercase only, placed at the end of compound formula. App can send the data toΒ Gas Phase Stoichiometry app to further calculate pressures and volumes of gaseous compounds. Either moles or masses can be filled in, but if by mistake both are provided and they donβt match, then the moles value will have a preference. Component will be taken into consideration once the stoichiometric coefficient is provided for it. For balancing redox reactions please refer to Electrochemistry application. Further information and examples are provided at http://www.volard.wordpress.com.
Sift Science
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Sift helps researchers cut through scientific information overload. Most research feeds maximize volume. Sift maximizes relevance. Create personalized science feeds tailored to your exact interests using intelligent keyword optimization and customizable filtering. Instead of scrolling through hundreds of irrelevant papers, Sift surfaces the research that matters most to you. Built for researchers who want a faster, more focused way to stay current with the scientific literature. Features Personalized Research Feeds Create custom feeds based on keywords, topics, publications, or research interests. Sift continuously filters new literature to deliver highly relevant papers directly to your feed. Keyword Lab Optimize and refine keywords before creating a feed. Test combinations, evaluate article volume, and tune your feeds to achieve the right signal-to-noise ratio for your workflow. AI-Powered Abstract Analysis Instantly understand a paperβs core findings, methods, novelty, and significance with structured abstract analysis designed for rapid scientific discovery. Full Paper Analysis Go beyond abstracts with full-paper analysis that distills complex research into clear insights, highlights key contributions, and identifies important findings across the entire paper. Explore Landmark Research Discover influential and landmark papers across a wide range of scientific disciplines through the Explore page. Bookmarks & Reading Lists Save important papers from any feed or discovery surface to revisit later. Research Alerts Stay updated as new papers matching your interests are published. Easy Feed Creation Import publications and quickly generate personalized feeds based on your existing research profile and scientific interests. Designed for Researchers Whether you are an academic researcher, clinician-scientist, graduate student, or industry professional, Sift helps you spend less time filtering papers and more time engaging with the research that matters. Subscription Information Sift requires a subscription to access app features. A 7-day free trial is available for new users. Subscription features include: Up to 5 personalized feeds Unlimited abstract analyses Up to 30 full-paper analyses Keyword Lab access Bookmarks Alerts Explore access Additional premium research tools Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. You can manage and cancel subscriptions in your App Store account settings. Data Sources Sift indexes publicly available scientific metadata and research information from sources including PubMed and OpenAlex. Availability of full-text content may vary depending on publisher access and licensing. By downloading this app, you agree to Apple's Standard License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Sift Science at Free against Stoichiometry's $2.99. Sift Science also leads on update cadence (every 2 days vs every 2 months). Stoichiometry's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Sift Science is free to download; Stoichiometry costs $2.99 up front. Sift Science sells 2 in-app purchases, starting at $4.99 per month. Stoichiometry asks for nothing beyond the download.
Stoichiometry ships an update every 2 months, Sift Science every 2 days. The most recent releases landed on November 13, 2026 and October 31, 2026 respectively.
| Parameter | Stoichiometry | Sift Science |
|---|---|---|
| Price | $2.99 | Free β better |
| Positive reviews | 50.0% of reviews | β |
| Update frequency | Every 2 months | Every 2 days β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Monetization | Paid | β |
| Devices | iPhone, iPad β better | iPhone |
| Requires iOS | 17.1 β better | 18.6 |
| Further details β not scored | ||
| Size | 1 MB | 83 MB |
| Age rating | 4+ | 4+ |
| Developer | Roman Volinsky | Shobel LLC |
In-app purchases
Stoichiometry
No in-app purchases
Sift Science
- Sift Premium Monthly7 Days trial$4.991 Month
- Sift Premium7 Days trial$39.991 Year
Questions
Is Stoichiometry free?
Is Sift Science free?
Do Stoichiometry or Sift Science have ads?
Which is updated more often, Stoichiometry or Sift Science?
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