Twi vs Structura
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Twi
This app helps you manage your time spent on social media platforms like Twitter and Facebook. It allows you to set daily limits and timers for browsing sessions, preventing excessive use and promoting a healthier balance between online and offline activities.
- Set daily social media limits
- Schedule browsing timers
- Supports Twitter and Facebook
- Automatic session shutdown
- Prevents internet addiction
- Promotes healthy digital habits
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■Timer + ■Twitter + ■Counter → Save your time. This app is a "Time Saver for the Twitter use” ■ You won't waste your time on the SNSs, saving you from SNS Addiction! ① As you plan beforehand, you'll quit the SNS as scheduled. ② The ONE-DAY-LIMIT for the SNS use, you can regulate the SNS browsing. By ① and ②, you won't waste your time anymore. ◯ You can select Facebook as well as Twitter. ■ How to use ■ 1. Set the one-day-limit counter once in a day. 2. Set the timer for the browsing. 2. Select Twitter or Facebook. 3. Tap the start button to enjoy the SNS. When the timer is over, the view automatically shut down and you can naturally quit the SNS. ■ Purpose■ @ Save your time @ Prevent you from Internet addiction. @ Get your healthy rhythm between SNSs and real activities. [Please Note!] This app supports for English and Japanese language environment. Please use on English or Japanese language environment. (The counter for one-day-limit doesn't work on other language preferences.)
Structura
Learn chemical reactions by playing a falling-block puzzle game. Combine elements and ions to build compounds, with over 350 reactions covered. Practice recall with quizzes and tests, and experiment freely with all elements.
- Falling-block puzzle gameplay
- Element and ion combination
- 356 chemical reactions covered
- 46 learning stages
- In-game quizzes and tests
- Free experiment mode
- Visual representation of compounds
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LEARN CHEMICAL REACTIONS WITH A FALLING-BLOCK PUZZLE Drop elements and ions, place them side by side, and they combine. H plus O makes −OH. Add another H and you have H₂O. A compound forms only when the bonds and charges add up. Instead of turning textbook pages, you build each reaction with your own hands. WHAT'S INSIDE 356 reactions across inorganic, organic and polymer chemistry (308 in the Codex), in 46 stages. - From atoms to molecules - Making gases, and the halogens - Metals, oxides and industrial methods (contact process, Ostwald process, ammonia-soda process, blast furnace) - Acids, bases, neutralization and salts - Redox and ionization tendency (permanganate, dichromate, iodometric titration) - Metal ion precipitates and complex ions - Aliphatic compounds (oxidizing alcohols, esterification, silver mirror test, iodoform test) - Aromatic compounds (nitration, sulfonation, diazotization, azo dyes, cumene process) - Polymers (sugars, amino acids, protein tests, resins, rubber, vinylon) This app is about reactions. It does not cover calculation topics such as moles, equilibrium, electrochemistry, thermochemistry or crystal lattices. The content follows the Japanese high school chemistry curriculum, so some topics and terms may differ from your course. BUILT TO BE SEEN Benzene is drawn as a hexagon, glucose as a ring, starch as linked rings. Precipitates sink to the bottom and gases escape upward, in their real colors. PRACTICE RECALLING - A 3-question quiz after each stage, with the product hidden - A Test mode in the Codex that masks the products - Reactions you miss come back in later quizzes, and their materials fall more often SET UP THE CONDITIONS YOURSELF Heat, electrolysis, light and catalysts are devices you use on the whole flask. You decide when to use them. FREE EXPERIMENT MODE With the full unlock, choose what falls, in the order you like, and try your own combinations. No targets and no material limit. MEET THE ELEMENTS Each of the 46 stages introduces a character who teaches the key point of that topic, in a short conversation with Mol, an apprentice chemist. PRICING Units 1-3 (14 stages, 91 Codex entries) are free. A one-time purchase unlocks everything else. - No additional charges - No subscriptions - No ads - No gacha - No stamina
Screenshots
Verdict
The clearest difference is in-app purchases: Twi at none against Structura's 1. Twi also leads on iOS requirement (9.2 vs 17.0). Structura's advantage is update cadence (every 4 days vs every 2 weeks). On price, review sentiment, 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
Both are free to download. Structura sells 1 one-off in-app purchase. Twi asks for nothing beyond the download.
Twi ships an update every 2 weeks, Structura every 4 days. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.
| Parameter | Twi | Structura |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 9.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 100 MB |
| Age rating | 4+ | 4+ |
| Developer | Masao Yamashita | SNAPLACE LLC |
Customer experience
Twi
Structura
In-app purchases
Twi
No in-app purchases
Structura
- Unlock All Units$2.99









