# AP Environmental Science vs Trigonometry Identities Proofs

The clearest difference is price: AP Environmental Science at Free against Trigonometry Identities Proofs's $0.99. AP Environmental Science also leads on rating (4.4 vs 1.0) and review sentiment (33% vs 0%). Trigonometry Identities Proofs's advantage is in-app purchases (none vs 7) and iOS requirement (13.0 vs 15.6). On ads and device support there is nothing between them.

AP Environmental Science is free to download; Trigonometry Identities Proofs costs $0.99 up front. AP Environmental Science sells 7 in-app purchases, starting at $5.99 per 7 days. Trigonometry Identities Proofs asks for nothing beyond the download.

AP Environmental Science holds the better App Store score, 4.4 against 1.0. Both are backed by a comparable volume of ratings — 7 and 2 respectively. Written reviews point the same way: 33% of AP Environmental Science's written reviews are positive against 0% of Trigonometry Identities Proofs's.

AP Environmental Science ships an update every 6 months, Trigonometry Identities Proofs every 32 months. The most recent releases landed on October 15, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | AP Environmental Science | Trigonometry Identities Proofs |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.4 (7 ratings)](https://appshunter.io/ios/app/ap-environmental-science/id1514861166/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/trigonometry-identities-proofs/id1547838514/reviews) |
| Number of ratings | **7** | 2 |
| Positive reviews | **33.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 32 months |
| Monetization | **Freemium** | Paid |
| Size | 29 MB | 18 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Expanded Apps](https://appshunter.io/developer/313709778) | [H3Apps LLC](https://appshunter.io/developer/598620927) |

## What reviewers say

### AP Environmental Science

[App page](https://appshunter.io/ios/app/ap-environmental-science/id1514861166)

Prepare for your AP Environmental Science exam with 500 practice questions covering all topics. Utilize study, timed exam, and bookmark modes to track progress and review effectively. Access all content with a subscription.

**Highlights:** 500 AP-style practice questions, Concise answer explanations, Study, Timed Exam, and Bookmark modes, Progress tracking, iCloud save functionality, Interactive features

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week | $5.99 | per 7 days |
| 1 Week | $6.99 | per 7 days |
| 1 Month | $17.99 | per month |
| 3 Month Subscription Plan | $39.99 | per 3 months |
| 1 Year | $69.99 | per year |
| Annual Subscription Plan | $99.99 | per year |
| AP Environmental Science | $15.99 | one-time |


### Trigonometry Identities Proofs

[App page](https://appshunter.io/ios/app/trigonometry-identities-proofs/id1547838514)

Learn and practice trigonometric identity proofs with step-by-step solutions. Compare your work to the app's detailed explanations, revealing each step individually.

**Highlights:** 42 trigonometric identity proofs, Step-by-step solution reveal, Compare your work to app solutions, Practice trigonometry, Educational math tool

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is AP Environmental Science free?

AP Environmental Science is free to download, with in-app purchases available.

### Is Trigonometry Identities Proofs free?

Trigonometry Identities Proofs costs $0.99, with no in-app purchases.

### Which has better reviews, AP Environmental Science or Trigonometry Identities Proofs?

AP Environmental Science is rated higher. AP Environmental Science averages 4.4 out of 5 from 7 ratings, while Trigonometry Identities Proofs averages 1.0 from 2 ratings.

### Do AP Environmental Science or Trigonometry Identities Proofs have ads?

Neither AP Environmental Science nor Trigonometry Identities Proofs shows ads.

### Which is updated more often, AP Environmental Science or Trigonometry Identities Proofs?

AP Environmental Science ships an update every 6 months, and Trigonometry Identities Proofs every 32 months. Most recently, AP Environmental Science was updated on October 15, 2026 and Trigonometry Identities Proofs on October 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*