ThinkByte vs Cortis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ThinkByte
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.
- 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
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ThinkByte is an AI assistant that runs on your iPhone instead of in the cloud. Ask it a question, talk to it, or show it a photo, and it answers right on the device. Nothing connects to a server, so it works the same on a flight, on the subway, or anywhere with no signal. Your conversations stay on your phone and are never uploaded. Type or talk. Use the keyboard, or hold the mic and speak. ThinkByte takes voice and images, not just text. Choose your model. Download a small, fast model or a larger one for tougher questions, right from the app. More get added over time. Private by default. No account. No sign-up. Your chats never leave your phone. Anonymous diagnostics are optional and you can turn them off in Settings. Built for real life: Flights and travel Subways, basements, and dead zones Limited or expensive data plans Anyone who would rather keep their conversations off other people's servers Download ThinkByte and start chatting, fully offline.
Cortis
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.
- On-device AI processing
- Offline functionality
- Siri integration
- Shortcuts automation
- Image analysis
- Multiple AI models
- No ads or tracking
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AI chat that runs on your phone. Cortis runs language models directly on your iPhone. Once a model is downloaded, chats work without an internet connection, and you don't need an account to start. WHAT YOU GET • Chat without a connection once a model is downloaded: the model runs on your device • No account needed • Ask about a photo with a vision model • Choose the model that fits your phone: smaller models are fast and light, larger ones give stronger answers FREE PLAN AND PRO Cortis has a free plan with smaller models. Cortis Pro unlocks larger models and the performance view. Pro is offered as a weekly subscription (with a free trial when you are eligible), an annual subscription, or a one-time lifetime purchase. Prices are shown in the app before you buy and may vary by country. Weekly and annual subscriptions renew automatically unless you cancel at least 24 hours before the end of the current period. Payment is charged to your Apple ID at confirmation of purchase (or when a free trial ends). Manage or cancel in your Apple ID account settings. Any unused part of a free trial is forfeited when you buy a subscription. Terms of Use: https://neron.app/products/cortis/terms Privacy Policy: https://neron.app/products/cortis/privacy
Screenshots
Verdict
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.
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. 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.
| Parameter | ThinkByte | Cortis |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (12 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 50.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 12 — better | 1 |
| Update frequency | Fortnightly | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 64 MB | 79 MB |
| Age rating | 4+ | 12+ |
| Developer | ByteInk L.L.C-FZ | Batuhan Ayhan |
Customer experience
ThinkByte
Cortis
In-app purchases
ThinkByte
- Lifetime Premium$9.99
Cortis
- Cortis Pro Monthly7 Days trial$2.991 Month
- Cortis Pro Weekly3 Days trial$4.997 Days
- Cortis Pro Annual7 Days trial$9.991 Year
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- Cortis Pro Annual3 Days trial$29.991 Year
- Cortis Pro$14.99
- Cortis Pro Lifetime$49.99
