# Tathastu vs PrepAiro

The clearest difference is update cadence: PrepAiro at every 10 days against Tathastu's every 9 months. PrepAiro also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Tathastu sells 1 one-off in-app purchase and PrepAiro sells 29 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Tathastu ships an update every 9 months, PrepAiro every 10 days. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Tathastu | PrepAiro |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 92.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 73 MB | 264 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ajay Kumar Jain](https://appshunter.io/developer/1772052251) | [PrepAIro](https://appshunter.io/developer/1795391659) |

## What reviewers say

### Tathastu

[App page](https://appshunter.io/ios/app/tathastu-ics/id6736460338)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HISTORY FOUNDATION - 2024 | $199.99 | one-time |


### PrepAiro

[App page](https://appshunter.io/ios/app/prepairo-crack-upsc-cse/id6741750813)

This app offers comprehensive preparation for the UPSC Civil Services Exam with AI-powered learning tools. It features voice-based doubt solving, extensive video lessons, mock tests, and AI-driven answer evaluation to help aspirants master Prelims and Mains.

**Highlights:** AI Voice Mentor for doubt solving, 2000+ video lessons, 10 Lakh+ UPSC MCQs, AI Mains Answer Evaluation, Daily Current Affairs, PYQs, NCERTs, and Mock Tests, Personalized study plans

**In-app purchases (29)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PrepAiro Plus Weekly | $0.99 | per 7 days |
| PrepAiro Plus Monthly | $1.99 | per month |
| PrepAiro Plus Monthly | $2.99 | per month |
| PrepAiro Monthly Plan | $2.99 | per month |
| PrepAiro Plus Monthly | $3.99 | per month |
| PrepAiro Plus Monthly | $7.99 | per month |
| PrepAiro Plus Monthly Plan 899 | $8.99 | per month |
| PrepAiro Plus Monthly Plan | $9.99 | per month |
| PrepAiro Plus Yearly | $9.99 | per year |
| PrepAiro Plus Yearly | $19.99 | per year |
| PrepAiro Plus Target 2026 | $7.99 | one-time |
| PrepAiro Prelims Mock Test Series | $7.99 | one-time |
| PrepAiro Plus Yearly | $8.99 | one-time |
| PrepAiro Yearly Plan | $9.99 | one-time |
| PrepAiro Plus Target 2026 | $9.99 | one-time |
| PrepAiro Plus Yearly | $9.99 | one-time |
| PrepAiro Pro Yearly | $11.99 | one-time |
| PrepAiro Pro Plan | $14.99 | one-time |
| PrepAiro Plus Yearly | $14.99 | one-time |
| PrepAiro Plus Target 2027 | $19.99 | one-time |
| PrepAiro Yearly Plan | $19.99 | one-time |
| PrepAiro Yearly Plan | $22.99 | one-time |
| PrepAiro Plus Target 2027 | $24.99 | one-time |
| Upgrade to 2028 Prep | $29.99 | one-time |
| PrepAiro Yearly Plan | $29.99 | one-time |
| PrepAiro Plus Target 2027 | $34.99 | one-time |
| PrepAiro Plus Target 2027 | $39.99 | one-time |
| PrepAiro Yearly Plan | $39.99 | one-time |
| PrepAiro Plus Target 2028 | $79.99 | one-time |


## Frequently asked questions

### Is Tathastu free?

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

### Is PrepAiro free?

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

### Do Tathastu or PrepAiro have ads?

Neither Tathastu nor PrepAiro shows ads.

### Which is updated more often, Tathastu or PrepAiro?

Tathastu ships an update every 9 months, and PrepAiro every 10 days. Most recently, Tathastu was updated on October 25, 2026 and PrepAiro on October 23, 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.*