# ThinkByte vs Cortis

The clearest difference is review sentiment: ThinkByte at 50% against Cortis's 0%. ThinkByte also leads on rating (4.2 vs 1.0) and ratings volume (12 vs 1). Cortis's advantage is update cadence (weekly vs fortnightly). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. ThinkByte sells 1 one-off in-app purchase and Cortis sells 6 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ThinkByte holds the better App Store score, 4.2 against 1.0. That said, the two scores are not equally well evidenced: ThinkByte has 12 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of ThinkByte's written reviews are positive against 0% of Cortis's.

ThinkByte ships an update fortnightly, Cortis weekly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ThinkByte | Cortis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (12 ratings)](https://appshunter.io/ios/app/thinkbyte-offline-local-ai/id6746089787/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/cortis-on-device-ai-chat/id6760265080/reviews) |
| Number of ratings | **12** | 1 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 64 MB | 79 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [ByteInk L.L.C-FZ](https://appshunter.io/developer/1765895279) | [Batuhan Ayhan](https://appshunter.io/developer/1880809979) |

## What reviewers say

### ThinkByte

[App page](https://appshunter.io/ios/app/thinkbyte-offline-local-ai/id6746089787)

This AI assistant operates entirely on your device, offering private and fast responses without internet access. It's ideal for brainstorming, learning, and getting writing support, ensuring your data remains secure and local.

**Highlights:** Fully offline AI operation, Private and secure on-device data, Instant AI responses, Choice of local AI models, Writing and learning support, No accounts or tracking

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $9.99 | one-time |


### Cortis

[App page](https://appshunter.io/ios/app/cortis-on-device-ai-chat/id6760265080)

This app provides an on-device AI chatbot that functions entirely offline, requiring no internet connection or account. It integrates with Siri and Shortcuts for hands-free use and automations, and can analyze images locally. The free version offers extensive features, with an optional Pro upgrade for more models and advanced capabilities.

**Highlights:** On-device AI processing, Offline functionality, Siri integration, Shortcuts automation, Image analysis, Multiple AI models, No ads or tracking

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cortis Pro Monthly | $2.99 | per month |
| Cortis Pro Weekly | $4.99 | per 7 days |
| Cortis Pro Annual | $9.99 | per year |
| Cortis Pro Annual | $29.99 | per year |
| Cortis Pro | $14.99 | one-time |
| Cortis Pro Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is ThinkByte free?

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

### Is Cortis free?

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

### Which has better reviews, ThinkByte or Cortis?

ThinkByte is rated higher. ThinkByte averages 4.2 out of 5 from 12 ratings, while Cortis averages 1.0 from 1 ratings.

### Do ThinkByte or Cortis have ads?

Neither ThinkByte nor Cortis shows ads.

### Which is updated more often, ThinkByte or Cortis?

ThinkByte ships an update fortnightly, and Cortis weekly. Most recently, ThinkByte was updated on November 5, 2026 and Cortis on October 31, 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.*