Comparison

Linsen vs TK

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

Head to head
About

Linsen

This app helps patients select the right intraocular lens for cataract surgery based on their diopters, eye conditions, and personal goals. It provides vendor-independent information and visual examples to prepare patients for discussions with their ophthalmologists.

Highlights
  • Intraocular lens selection based on diopters
  • Considers accompanying eye diseases
  • Supports individual patient goals
  • Vendor-independent information
  • Illustrates post-surgery visual impressions
  • Includes all current intraocular lens types
Features
Read full description

Select your intraocular lens for cataract surgery depending on diopters and goal. By choosing an intraocular lens you can achieve a multitude of different targets. Whatever you're aiming at (e.g. getting rid of glasses for good, staying short-sighted in order to be able to read without glasses etc.) it is essential to be well informed before surgery in order to make the right decision. Ophthalmologists developed this app: depending on your diopters, accompanying eye diseases (macular drusen, age-related macular degeneration) and individual desires the app provides (vendor-independent) information about which intraocular lens can realize your plan and describes alternatives if your whishes exceed available options. Photos illustrate the visual impression you can achieve after surgery. All current intraocular lens types are included. As a well informed patient you are prepared for talking with your ophthalmologists when it comes to choosing among the variety of intraocular lenses.

About

TK

This app allows secure access to digital health services using your health insurance ID. It enables login to various health applications, manages registered devices, and handles consent settings for your health data.

Highlights
  • Create and use personal health ID
  • Login to digital health applications
  • Manage registered devices
  • Manage consents and authorizations
  • Secure identification via ID card or health card
Read full description

Nutzen Sie die App um TK-Safe, E-Rezepte in der TK-App oder den TK-GesundheitsMessenger (TI-M) zu nutzen. Mit TK-Ident und Ihrer TK-GesundheitsID können Sie sich an digitalen Gesundheitsanwendungen anmelden - bequem per Smartphone, jederzeit und überall. FUNKTIONEN - Erstellen und nutzen Sie über TK-Ident Ihre persönliche TK-GesundheitsID - Verwenden Sie TK-Ident, um sich z. B. an TK-Safe, E-Rezept in der TK-App oder dem TK-GesundheitsMessenger anzumelden. - Verwalten Sie Ihre registrierten Geräte - Verwalten Sie Ihre Zustimmungen und Freigaben SICHERHEIT Über die TK-Ident App können Sie auf sensible Gesundheitsdaten, wie beispielsweise Ihre elektronische Patientenakte TK-Safe, zugreifen. Diese Daten haben einen besonders hohen Schutzbedarf und deshalb auch hohe Sicherheitsanforderungen. Damit Sie die App nutzen können, ist eine sichere Identifikation erforderlich. Nutzen Sie dafür einfach die Online-Ausweisfunktion Ihres Personalausweises oder Ihre Gesundheitskarte mit PIN. Wir bitten Sie außerdem, diese Identifikation in regelmäßigen Abständen zu wiederholen. Unser Sicherheitskonzept für TK-Ident basiert auf strengen gesetzlichen Vorgaben. Um Ihnen ein gutes und sicheres Kundenerlebnis bieten zu können, entwickeln wir unser Konzept stetig weiter. WEITERENTWICKLUNG Wir verbessern die TK-Ident App kontinuierlich – Ihre Ideen und Hinweise helfen uns dabei am meisten. Schreiben Sie uns gerne an service@tk.de. VORAUSSETZUNG - TK-Versichert - iOS 16 oder höher BARRIEREFREIHEIT Wir bemühen uns, Ihnen eine möglichst barrierefreie App zur Verfügung zu stellen. Die Erklärung zur Barrierefreiheit finden Sie unter: https://www.tk.de/techniker/2026116

Screenshots

Linsen2 screens
TK4 screens

Verdict

The call

The clearest difference is review sentiment: TK at 65% against Linsen's 0%. TK also leads on price (Free vs $5.99) and update cadence (every 5 weeks vs every 5 months). Linsen's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

TK is free to download; Linsen costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Linsen ships an update every 5 months, TK every 5 weeks. The most recent releases landed on September 16, 2026 and September 24, 2026 respectively.

Scorecard6 real differences · 4 level
Linsen versus TK: the parameters behind the verdict, then further details
ParameterLinsenTK
Price$5.99Free — better
Rating—1.4 (14 ratings) — better
Positive reviews0.0% of reviews65.2% of reviews — better
Number of ratings—14 — better
Update frequencyEvery 5 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better18.0
Further details — not scored
Size70 MB192 MB
Age rating4+4+
DeveloperRonald KruegerTechniker Krankenkasse (TK)

Customer experience

Linsen

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

TK

All ratings14 ratings
Positive7.1%
Neutral7.1%
Negative85.7%
Written reviews69 reviews
Positive65.2%
Neutral7.2%
Negative27.5%

In-app purchases

None

Linsen

No in-app purchases

None

TK

No in-app purchases

Questions

Is Linsen free?
Linsen costs $5.99, with no in-app purchases.
Is TK free?
TK is free to download, with no in-app purchases.
Do Linsen or TK have ads?
Neither Linsen nor TK shows ads.
Which is updated more often, Linsen or TK?
Linsen ships an update every 5 months, and TK every 5 weeks. Most recently, Linsen was updated on September 16, 2026 and TK on September 24, 2026.

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