Comparison

Zettelbox vs Singularity Codex

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

Head to head
About

Zettelbox

Capture inspiration and organize your life with this app that integrates notes, to-dos, and scheduling. It helps transform scattered information into a structured knowledge base through smart review and related note linking. Enjoy secure local storage with optional cloud backups.

Highlights
  • Quick note capture with desktop widget
  • Intuitive tagging and nested categorization
  • Smart review to rediscover past thoughts
  • Link related notes for deeper understanding
  • Local encrypted storage
  • Cloud backup support
Features
Read full description

Unleash creativity and easily capture inspiration! Smartly integrate notes, to-dos, and schedule. Organize your life and work efficiently, ensuring you don’t miss any bursts of inspiration. In today's era of information overload, Zettelbox serves as a reliable companion, helping you capture every valuable thought amidst a sea of ideas. It's not just a tool, but a bridge that connects your inspiration with reality. Whether during a hectic workday or a quiet night, Zettelbox is always ready to record your thoughts, transforming scattered information into a well-organized knowledge treasure trove. [Main Features] Quick Capture: Wherever you are, you can use Zettelbox to jot down any information you need. Our desktop widget offers quick access and recording capabilities, ensuring no important content is missed. Flexible Management: With an intuitive tagging system, managing your notes is effortless. Nested tags allow for efficient categorization and filtering, ensuring important content is always within reach. Smart Review: Zettelbox's smart review feature helps you rediscover past thoughts and notes, connecting bits of inspiration to spark new insights. Whether you're revisiting old notes or seeking new ideas, Zettelbox is your dependable assistant. Related Notes: Zettelbox links scattered ideas, helping you build a coherent network of thoughts and enhancing the overall value of your information. The simplified linking feature makes it easy to find related content for deeper understanding and application. [Data Security and Offline Use] Your information security is paramount. Zettelbox offers local encrypted storage and supports cloud service backups, ensuring your data is always secure and accessible. More flexible data export options will be available in the future for your peace of mind. Zettelbox is the perfect tool for exploring, recording, and connecting ideas. It makes knowledge management smarter, allowing your thoughts to grow continuously through recording and reflection. Whether turning inspiration into action or weaving fragmented information into a complete knowledge network, Zettelbox will accompany you every step of the way, helping you embrace a brighter future. [Subscription Information] Unlock the full potential of Zettelbox with our PowerPack subscription. Choose between monthly or annual plans and manage your subscription with ease. Please note that all subscriptions are non-refundable, and benefits take effect immediately upon purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://zettelboxapp.com/PrivacyPolicy.html

About

Singularity Codex

Features
Read full description

The only person worth messaging is you. Singularity Codex is a private chat with yourself — a note-to-self app, a journal and a personal archive in one conversation. Text yourself a thought. Send yourself a photo, a voice note, a link, a PDF. It lands where you left it, in the order you had it, and it stays there. No folders to choose. No titles to write. No account to create. You already message yourself. Everyone does: the chat with just you in it, the email to your own address, the notes app you never open twice. Codex is what that habit deserves — a codex of your own life, written a line at a time and kept for good. SEND YOURSELF ANYTHING • Notes, thoughts, ideas, lists — type and send • Photos and videos from your library, or straight from the camera • Voice messages, transcribed on your iPhone so you can search what you said • Links, with a preview card instead of a bare address • PDFs and documents from Files • Anything from any app, through the share sheet • Hands-free with Siri and Shortcuts: "Send to Codex" • Reply to an old message to carry a thought forward • Star, pin, copy, or select many at once REMINDERS WRITTEN IN YOUR OWN WORDS Write "Call the dentist tomorrow at 10" and Codex offers the reminder. One tap and it is set — no form, no date picker, no second app. It understands English, Turkish, German, French and Spanish. The Now tab gathers what matters today: overdue, due today, tasks, pinned messages, what you just saved, and what you wrote on this day. YOUR PERSONAL HISTORY, DRAWN The Codex tab turns your archive into a history you can read. Every year you have kept becomes twelve calendars, shaded by how much you wrote. Tap any day and read yourself back. Collections build themselves — starred, pinned, reminders, tasks, links, photos, videos, voice, files — and on-device labels such as Idea, Task, Work, Personal, Memory and Event sort your messages without you ever filing a thing. Now and then, Codex shows you what you wrote a week, a month or a year ago. TODAY: WHAT YOU CHOSE TO READ Follow a site's feed, a podcast, a YouTube channel, a Mastodon or Bluesky account, a subreddit. Posts arrive newest first, grouped by day — no algorithm, no ranking, nothing promoted. Mute a word, hide someone, or keep a post in your archive with one tap. FIND ANYTHING IN A SECOND Search every message, link title, file name and voice transcript at once, then narrow it to photos, links, voice, files or ideas. PRIVATE BY ARCHITECTURE, NOT BY PROMISE • No account. No sign-up. No login. • No analytics, no tracking, no ads, no third-party SDKs • No server of ours — there is nowhere for your archive to be sent • Labels are worked out on your iPhone and never leave it • Voice is transcribed on the device, or not at all • App Store privacy label: Data Not Collected ICLOUD, ONLY IF YOU WANT IT Turn on sync and your archive — messages, photos, recordings and documents — lives in your own private iCloud database and appears on your other iPhones. We have no access to it. With Advanced Data Protection on, it is end-to-end encrypted. AN ARCHIVE YOU CAN LEAVE WITH Export everything, any time: your messages as JSON and as plain text, with every photo, recording and document, in one zip that opens without this app. Save any photo or video back to your library in a tap. MAKE IT YOURS Five color themes, light and dark appearance, and the whole app in five languages. ONE PRICE. NO SUBSCRIPTION. Try everything free for 14 days. When the trial ends, your archive stays readable, searchable and exportable — forever, at no cost. Adding new messages takes one purchase, once. No subscription, no renewals, no ads. Your thoughts are not content. Your archive is not a product. Start your codex.

Screenshots

Zettelbox4 screens
Singularity Codex4 screens

Verdict

The call

The clearest difference is device support: Zettelbox at 3 against Singularity Codex's 1. Zettelbox also leads on iOS requirement (16.0 vs 26.0). On price, 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

Both are free to download. Zettelbox sells 3 in-app purchases, starting at $4.99 per month and Singularity Codex sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Scorecard2 real differences · 8 level
Zettelbox versus Singularity Codex: the parameters behind the verdict, then further details
ParameterZettelboxSingularity Codex
PriceFreeFree
Rating4.3 (24 ratings) — better—
Positive reviews30.8% of reviews—
Number of ratings24 — better—
Update frequencyEvery 2 weeks—
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, Mac — betteriPhone
Requires iOS16.0 — better26.0
Further details — not scored
Size117 MB5 MB
Age rating4+17+
DeveloperHong Kong Source Research Society Supply Chain LimitedBURAK KADAN

In-app purchases

3 purchases

Zettelbox

Subscriptions2
  • Monthly Plan$4.991 Month
  • Yearly Plan$19.991 Year
One-time1
  • PowerPack Permanent$64.99
2 purchases

Singularity Codex

One-time2
  • 14-day TrialFree
  • Codex, for good$12.99

Questions

Is Zettelbox free?
Zettelbox is free to download, with in-app purchases available.
Is Singularity Codex free?
Singularity Codex is free to download, with in-app purchases available.
Do Zettelbox or Singularity Codex have ads?
Neither Zettelbox nor Singularity Codex shows ads.

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