Comparison

Obsidian vs Aldiax

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

Head to head
About

Obsidian

Organize your thoughts and ideas with a powerful knowledge base that stores your notes as plain text Markdown files. Access your personal second brain on any device, with extensive customization options and community-driven plugins.

Highlights
  • Local Markdown file storage
  • Customizable toolbar
  • Graph view
  • Community plugins
  • Themes
  • Sidebar pinning
  • iCloud vaults
Features
Read full description

Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files. It is a second brain, for you, forever. Now available on the go for iOS! Features include: - Customizable toolbar - Pull down quick actions - Graph view - Community plugins - Themes - Sidebar pinning for tablet - iCloud vaults

About

Aldiax

Features
Read full description

Aldiax teaches you to use artificial intelligence by working through real situations, not by memorising definitions. Five minutes a day. No theory you will have forgotten by tomorrow. HOW IT WORKS Every lesson is a handful of short exercises about something you will actually run into: asking for a piece of writing and getting what you had in mind, spotting that it has made a fact up, deciding what information you should never paste into it, or recognising when pushing further stops improving the result. Right or wrong, we always tell you why. Getting it wrong here carries no penalty: it is part of learning. FOUR SECTIONS · Knowledge: the skills that work today and will still work in a year. Giving context, iterating, verifying, setting limits. Free and complete. · Latest: what keeps changing in AI, turned into practice. Not so you stay informed, but so you know how to use it. · Vocabulary: the words everyone uses and nobody explains to you. API, prompt, token, RAG, agent. · News: what has come out in AI, in three sentences. Free for everyone. AT YOUR OWN PACE A streak that keeps you company without nagging, freezes for when life gets in the way, and a profile that shows you which skills you are strong in and which you are not. ALDIAX PRO The subscription gives you every capsule in "Latest", the full Vocabulary glossary and twice the lives. You can use Aldiax free for as long as you like: the full Knowledge path and the News are included at no cost. There are two plans: Aldiax Pro Weekly, one week long, and Aldiax Pro Monthly, one month. The price of each is shown on the subscription screen inside the app. The subscription renews automatically unless you cancel at least 24 hours before the current period ends. You can manage or cancel it any time in your App Store account settings. Privacy policy: https://aldiax.com/privacidad Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Obsidian4 screens
Aldiax4 screens

Verdict

The call

The clearest difference is in-app purchases: Obsidian at none against Aldiax's 2. Obsidian also leads on chart position (#126 vs unranked) and device support (3 vs 1). Aldiax's advantage is update cadence (every 9 days vs every 3 weeks). On price, ads and iOS requirement 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. Aldiax sells 2 in-app purchases, starting at $0.99 per 7 days. Obsidian asks for nothing beyond the download.

UpkeepUpdate frequency

Obsidian ships an update every 3 weeks, Aldiax every 9 days. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 7 level
Obsidian versus Aldiax: the parameters behind the verdict, then further details
ParameterObsidianAldiax
PriceFreeFree
Rating4.5 (2.8K ratings) — better—
Positive reviews62.0% of reviews—
Number of ratings2.8K — better—
Update frequencyEvery 3 weeksEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
Best chart rank#126 — better—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better16.4
Further details — not scored
Size39 MB58 MB
Age rating4+12+
DeveloperDynalist Inc.Francisco Alabau

Bugs and requests

Obsidian

Reported bugs

3 issues
  • Sync issues leading to data loss
  • Freezing and crashing on mobile devices
  • Editing bugs and text input issues

Requested features

5 requests
  • Improved sorting and organization options
  • WYSIWYG editing on mobile
  • Better integration with other cloud storage services
  • More intuitive onboarding process for new users
  • Native mobile widgets and share sheet integration

Aldiax

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Obsidian

No in-app purchases

2 purchases

Aldiax

Subscriptions2
  • Aldiax Pro Weekly$0.997 Days
  • Aldiax Pro Monthly$2.991 Month

Questions

Is Obsidian free?
Obsidian is free to download, with no in-app purchases.
Is Aldiax free?
Aldiax is free to download, with in-app purchases available.
Do Obsidian or Aldiax have ads?
Neither Obsidian nor Aldiax shows ads.
Which is updated more often, Obsidian or Aldiax?
Obsidian ships an update every 3 weeks, and Aldiax every 9 days. Most recently, Obsidian was updated on November 9, 2026 and Aldiax on October 31, 2026.

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