Comparison

Zettelkasten vs Corteks

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

Head to head
About

Zettelkasten

This app creates a visual knowledge graph from your notes, allowing you to see and explore connections between ideas. It uses wiki-style linking and automatic backlinks to help you rediscover relationships and build a personal knowledge base without relying on traditional folders. Enjoy a private, ad-free experience where all your data stays on your device.

Highlights
  • Visual knowledge graph
  • Automatic backlinks
  • Wiki-style linking
  • Interactive orbit graph
  • Full-text search
  • Markdown export
Features
Read full description

Stop losing ideas in a pile of disconnected notes. NoteOrbit is a linked-notes app that turns everything you write into a living knowledge graph — every note becomes a node you can see, connect, and explore. Most note apps bury your thinking in folders. NoteOrbit does the opposite: type a note, drop a [[wiki-link]] to any other note, and the connection is built for you — both ways. Open any note and you instantly see what references it. Then step back and watch your ideas orbit as a glowing constellation you can pan, zoom, and tap to follow the thread. WHAT YOU GET - Write a note, add a [[wiki-link]], and NoteOrbit autocompletes titles and wires up the connection for you - Automatic backlinks so every note shows exactly what links to it — context folders can never give you - An interactive orbit graph that lays out your notes by how they actually connect - Instant tags with #hashtags to slice your notes any way you think - Hubs and orphans finder that surfaces your most-connected ideas and the notes hanging loose - Full-text search across every note, title, and link PERFECT FOR - Students and researchers building study and reference notes that reinforce each other - Writers and thinkers growing a personal knowledge base or second brain - Zettelkasten and PKM fans who want backlinks without a heavy desktop setup - Anyone journaling ideas and projects who wants to rediscover old connections WHY NOT JUST USE FOLDERS Folders force every note into one place and hide how your ideas relate. NoteOrbit lets a note live in as many contexts as it links to, then draws the map for you — so the connection you made months ago is one tap away, not lost three folders deep. PRIVACY Everything stays on your device. No account, no sign-in, no ads, no tracking. Your notes never leave your phone. FULL ACCESS NoteOrbit Premium unlocks the full experience: unlimited notes and connections, the complete interactive orbit graph, hubs, tags and the orphan finder, plus Markdown export to take your notes anywhere. Choose the plan that fits: - Weekly - Yearly - Lifetime (one-time purchase) Open NoteOrbit, write your first note, and link it — watch your thinking take shape. Terms of Use (EULA): https://web-levi.web.app/terms Privacy Policy: https://web-levi.web.app/privacy-policy Questions? tphuc.work@gmail.com

About

Corteks

Features
Read full description

Corteks is where you put a thought so you can stop holding it. Speak it, type it, or snap a photo. That is the whole job. Corteks reads what you captured, titles it, files it, and connects it to everything you have thought before. WHAT IT DOES WITH YOUR THINKING Reads every capture. A title, a one-line summary, what it is about, and the older thoughts it genuinely connects to. You never file anything yourself. Builds a graph, not a folder tree. Your thoughts cluster by what they are actually about, and you start seeing that you have been circling something for weeks. Writes your week, every Sunday. Not a step count. What you thought about, what changed, and what you keep returning to. Answers questions about your own mind. Chat is grounded in what you captured, so it points at your own words instead of inventing advice. Holds what you are working toward. Write down your objectives, focus three at a time, and Corteks reads those three closely. Three, because attention does not divide well. WHAT IT IS NOT No feed. No streaks. No badges. Nothing is public and nothing is shared, so there is nobody to perform for. It never tells you that you are behind. An objective that has gone quiet is reported as a fact, never as a failing. YOUR THOUGHTS ARE YOURS Everything is private to your account. It is used to build what the app shows you and nothing else: your graph, your readings, your weekly story, and the answers you get in chat. Export everything to your email whenever you like, in a readable file and as JSON. Delete your account and it all goes with it. CORTEKS PRO Start with a free trial. No card, and nothing is charged when you sign up. Pro covers capturing without limits, having every capture read and connected, your weekly reading, readings on your three focused objectives, and chat. After the trial, everything you already captured stays readable forever. Browsing, search, the graph, past readings and export never stop working. Corteks Pro is $9.99 per month or $79.99 per year. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. Manage or cancel it any time in your Apple Account settings. Terms: https://corteks.app/terms Privacy: https://corteks.app/privacy-policy

Screenshots

Zettelkasten4 screens
Corteks4 screens

Verdict

The call

The clearest difference is update cadence: Corteks at every 3 days against Zettelkasten's monthly. Corteks also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support 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

Both are free to download. Zettelkasten sells 2 in-app purchases, starting at $9.99 per 7 days and Corteks sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Zettelkasten ships an update monthly, Corteks every 3 days. Both last shipped on October 31, 2026.

Scorecard2 real differences · 7 level
Zettelkasten versus Corteks: the parameters behind the verdict, then further details
ParameterZettelkastenCorteks
PriceFreeFree
Rating3.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyMonthlyEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhoneiPhone, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size6 MB35 MB
Age rating4+17+
DeveloperPhuc PhamSanad Shegem

In-app purchases

2 purchases

Zettelkasten

Subscriptions2
  • Weekly$9.997 Days
  • Yearly3 Days trial$49.991 Year
2 purchases

Corteks

Subscriptions2
  • Corteks Pro Monthly$9.991 Month
  • Corteks Pro Yearly$79.991 Year

Questions

Is Zettelkasten free?
Zettelkasten is free to download, with in-app purchases available.
Is Corteks free?
Corteks is free to download, with in-app purchases available.
Do Zettelkasten or Corteks have ads?
Neither Zettelkasten nor Corteks shows ads.
Which is updated more often, Zettelkasten or Corteks?
Zettelkasten ships an update monthly, and Corteks every 3 days. Most recently, Zettelkasten was updated on October 31, 2026 and Corteks on October 31, 2026.

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