# Eureka Viewer vs TIA Study

The clearest difference is review sentiment: TIA Study at 100% against Eureka Viewer's 0%. TIA Study also leads on rating (4.2 vs 2.9) and update cadence (every 3 weeks vs every 3 months). Eureka Viewer's advantage is in-app purchases (none vs 10). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. TIA Study sells 10 one-off in-app purchases. Eureka Viewer asks for nothing beyond the download.

TIA Study holds the better App Store score, 4.2 against 2.9. Both are backed by a comparable volume of ratings — 9 and 23 respectively. Written reviews point the same way: 0% of Eureka Viewer's written reviews are positive against 100% of TIA Study's.

Eureka Viewer ships an update every 3 months, TIA Study every 3 weeks. The most recent releases landed on September 13, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Eureka Viewer | TIA Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (9 ratings)](https://appshunter.io/ios/app/eureka-viewer/id1532773030/reviews) | **[4.2 (23 ratings)](https://appshunter.io/ios/app/tia-study/id1547036414/reviews)** |
| Number of ratings | 9 | **23** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 260 MB | 67 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Archimedia Advantage Inc.](https://appshunter.io/developer/1532773032) | [The Infinite Actuary](https://appshunter.io/developer/886356301) |

## What reviewers say

### Eureka Viewer

[App page](https://appshunter.io/ios/app/eureka-viewer/id1532773030)

This eReader allows secure access and annotation of digitally protected PDF documents from specific platforms. It offers tools like highlighting, underlining, and note-taking, with an automatic index for easy reference and cross-device syncing. Optimized for statistical and mathematical content, it's ideal for intensive study.

**Highlights:** Secure access to protected PDFs, Highlighting and underlining, Margin notes and custom page notes, Automatic annotation index, Cross-device syncing, Optimized for statistical/mathematical content, Offline access (limited terms)

**Features:** macOS Compatibility

**In-app purchases:** none


### TIA Study

[App page](https://appshunter.io/ios/app/tia-study/id1547036414)

This learning platform offers a comprehensive study experience for exams. It provides scheduled daily tasks, video lessons, practice problems with AI scoring, and spaced repetition flashcards to aid memorization and mastery.

**Highlights:** Scheduled daily study tasks, Downloadable video lessons, AI-powered practice problems, Spaced repetition flashcards, Customizable quizzes and exams, Progress tracking and mastery scores

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| R Course | $199.99 | one-time |
| Accounting VEE - 6 Mo Access | $349.99 | one-time |
| Corp Finance VEE - 6 Mo Access | $349.99 | one-time |
| Micro Econ VEE - 6 Mo Access | $349.99 | one-time |
| Macro Econ VEE - 6 Mo Access | $349.99 | one-time |
| Databases Theory & Practice | $399.99 | one-time |
| Tech Skills - 12 Months Access | $449.99 | one-time |
| Exam P - 6 Months Access | $499.99 | one-time |
| Exam FM - 6 Months Access | $499.99 | one-time |
| Math Stats VEE - 6 Mo Access | $599.99 | one-time |


## Frequently asked questions

### Is Eureka Viewer free?

Eureka Viewer is free to download, with no in-app purchases.

### Is TIA Study free?

TIA Study is free to download, with in-app purchases available.

### Which has better reviews, Eureka Viewer or TIA Study?

TIA Study is rated higher. Eureka Viewer averages 2.9 out of 5 from 9 ratings, while TIA Study averages 4.2 from 23 ratings.

### Do Eureka Viewer or TIA Study have ads?

Neither Eureka Viewer nor TIA Study shows ads.

### Which is updated more often, Eureka Viewer or TIA Study?

Eureka Viewer ships an update every 3 months, and TIA Study every 3 weeks. Most recently, Eureka Viewer was updated on September 13, 2026 and TIA Study on September 10, 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.*