Comparison

Norkta vs Cortex

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Norkta

Features
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Meet Norkta, the privacy-focused PDF powerhouse designed for efficiency. KEY FEATURES โ€ข Compress: Reduce file sizes significantly while maintaining quality. โ€ข Invert Colors: Two algorithms that transform standard PDFs for a comfortable Dark Mode reading experience. โ€ข Merge: Combine multiple documents into a single file in seconds. โ€ข Extract Text: Instantly grab text content from your PDFs for editing or sharing. WHY NORKTA? โ€ข 100% Local Processing: Your data stays on your device. No servers, no uploads. Simple, fast, and secure. โ€ข Clean and intuitive interface design that keep your process focused and efficient. Take control of your PDFs starting today!

About

Cortex

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Cortex reads your images, documents, and text โ€” entirely on your device. No cloud. No account. No data sent anywhere. After a one-time model download, it works with no internet connection at all. Built for professionals who can't hand their confidential work to a cloud service, Cortex gives you the full power of a modern AI without the data exposure. No terms of service that claim rights to your inputs. No server logs. No risk of a breach leaking your client's name. Key features: - Voice mode โ€” speak naturally, get spoken replies. Fully on-device, nothing stored - Audio & video input โ€” attach media files and ask questions about them - Image & document input โ€” analyse photos, contracts, receipts, prescriptions and more - Fully offline after model download โ€” works on a plane, in a courthouse, anywhere - Zero data collection โ€” nothing is ever transmitted or stored outside your device - 43 supported languages โ€” switch freely between languages in any conversation - One-time purchase โ€” no monthly subscription, no usage limits after going Pro - Free tier included โ€” 25 messages per day at no cost, upgrade whenever you're ready - GDPR-friendly โ€” no data transfers to US servers or third parties Cortex runs a powerful on-device language model entirely on your hardware, giving you conversational AI that's fast and capable without any cloud dependency. Download free and try it today. Upgrade once โ€” use it forever.

Screenshots

Norkta4 screens
Cortex4 screens

Verdict

The call

The clearest difference is iOS requirement: Cortex at 15.1 against Norkta's 18.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Norkta sells 3 in-app purchases, starting at $0.99 per month and Cortex sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Norkta ships an update every 2 months, Cortex every 4 months. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

Scorecard1 real difference ยท 5 level
Norkta versus Cortex: the parameters behind the verdict, then further details
ParameterNorktaCortex
PriceFreeFree
Update frequencyEvery 2 months โ€” betterEvery 4 months
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS18.615.1 โ€” better
Further details โ€” not scored
Size2 MB84 MB
Age rating4+4+
DeveloperZixiang ZhangIppocode Technologies LLP

In-app purchases

3 purchases

Norkta

Subscriptions2
  • Norkta Pro Monthly$0.991 Month
  • Norkta Pro Yearly$2.991 Year
One-time1
  • Norkta Pro Lifetime$6.99
1 purchases

Cortex

One-time1
  • Cortex Pro$19.99

Questions

Is Norkta free?
Norkta is free to download, with in-app purchases available.
Is Cortex free?
Cortex is free to download, with in-app purchases available.
Do Norkta or Cortex have ads?
Neither Norkta nor Cortex shows ads.
Which is updated more often, Norkta or Cortex?
Norkta ships an update every 2 months, and Cortex every 4 months. Most recently, Norkta was updated on November 9, 2026 and Cortex on October 31, 2026.

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