Comparison

Möbius Sync vs MyBrainn

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

Head to head
About

Möbius Sync

Synchronize files between your iOS devices and other Syncthing-supported platforms without relying on cloud storage. Manage multiple folders and remote devices, with options for sandbox or experimental cross-app sandbox syncing.

Highlights
  • File synchronization between iOS and other Syncthing devices
  • No cloud service required
  • Supports multiple folders and remote devices
  • Sync within app sandbox or other app sandboxes (paid)
  • Uses open-source Syncthing engine
Features
Read full description

Möbius Sync brings Syncthing to your iPhone or iPad, allowing you to synchronize selected files between iOS devices and other devices supported by Syncthing, without the need for any cloud service. Supports multiple folders and multiple remote devices. Synchronized folders can be created either: 1. in the Möbius Sync sandbox and files can be added to and retrieved from shared folders via the iOS Files app; or 2. (PAID feature) by accessing other apps' sandboxes. This feature is EXPERIMENTAL and may break other app's functionality. Uses the open-source Syncthing engine internally. Usage within the Möbius Sync sandbox is free up to 20MB. Unlimited file sync, including files in other apps' sanboxes is available for a one-time purchase. NOTE: The functionality unlocked by in-app purchase is identical to that in Möbius Sync Pro (which is purchased up-front).

About

MyBrainn

Features
Read full description

Capture thoughts before they disappear. MyBrainn is a minimal voice-first second-brain app designed for creators, founders, thinkers, and anyone who wants to remember ideas before they disappear. Start a voice memo quickly from the app, Shortcuts, Siri, Control Center, Back Tap, or the Action Button on supported iPhones. When you stop recording, MyBrainn automatically transcribes your voice, generates a clean Markdown note, and saves it to the folder you choose. Your thoughts become searchable files without a manual export ritual. No accounts. No clutter. No unnecessary complexity. FEATURES • Fast voice capture • Shortcut, Siri, Control Center, Back Tap, and Action Button workflows • Automatic transcription after recording • Automatic Markdown note generation • Save to your own iCloud Drive, On My iPhone, or Files app folder • Local audio backup • Library with transcript viewing and audio playback • Offline-friendly workflow • Minimal, calm interface • Lock Screen and Live Activity recording status • Privacy-first architecture PRIVACY FIRST The current release performs transcription locally on your device. Your recordings, transcripts, and Markdown files stay on your device and in the folders you choose. MyBrainn does not upload your voice recordings to developer-owned servers in the current local release.

Screenshots

Möbius Sync1 screens
MyBrainn4 screens

Verdict

The call

The clearest difference is update cadence: MyBrainn at fortnightly against Möbius Sync's every 2 months. Möbius Sync's advantage is iOS requirement (14.1 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. Möbius Sync sells 1 one-off in-app purchase and MyBrainn sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Möbius Sync ships an update every 2 months, MyBrainn fortnightly. The most recent releases landed on October 13, 2026 and September 15, 2026 respectively.

Scorecard2 real differences · 8 level
Möbius Sync versus MyBrainn: the parameters behind the verdict, then further details
ParameterMöbius SyncMyBrainn
PriceFreeFree
Rating3.8 (140 ratings) — better—
Positive reviews55.0% of reviews—
Number of ratings140 — better—
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS14.1 — better17.0
Further details — not scored
Size23 MB8 MB
Age rating4+4+
DeveloperPickup Infinity LimitedSho Ito

Bugs and requests

Möbius Sync

Reported bugs

16 issues
  • Syncthing version incompatibility with v2.x devices
  • Device discovery limited to 1 of 5 paired devices
  • Insufficient space errors despite available storage
  • Purchase dialog rendering issues on older devices
  • Purchase not persisting after app reinstall
Show 11 more
  • Settings reset after app updates
  • External folder bookmark path cannot be changed
  • .stfolder sync failures and naming conflicts
  • Sync hangs at intermediate percentages
  • Files not appearing in designated folders despite sync confirmation
  • App crashes and becomes unresponsive
  • Language preference not saved between sessions
  • Syncthing disabled errors with no explanation
  • Quick Sync feature not working reliably
  • Accessibility issues with VoiceOver
  • App storage consuming excessive disk space (10GB+)

Requested features

15 requests
  • Update internal Syncthing to version 2.x or higher
  • iOS Photos app sync capability (at least one-way upload)
  • True background synchronization
  • Selective folder sync to save storage space
  • File Provider extension for deeper iOS integration
Show 10 more
  • Widget for continuous background operation
  • Photo library backup functionality
  • Family sharing support for purchases
  • Better UI/UX with custom frontend instead of web interface
  • Automatic sync without manual app opening
  • Support for untrusted devices
  • Folder encryption support
  • Location-based sync triggers
  • More frequent Syncthing core updates
  • Better documentation and setup guides

MyBrainn

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Möbius Sync

One-time1
  • Unlimited file sync$4.99
1 purchases

MyBrainn

One-time1
  • Lifetime Unlock$7.99

Questions

Is Möbius Sync free?
Möbius Sync is free to download, with in-app purchases available.
Is MyBrainn free?
MyBrainn is free to download, with in-app purchases available.
Do Möbius Sync or MyBrainn have ads?
Neither Möbius Sync nor MyBrainn shows ads.
Which is updated more often, Möbius Sync or MyBrainn?
Möbius Sync ships an update every 2 months, and MyBrainn fortnightly. Most recently, Möbius Sync was updated on October 13, 2026 and MyBrainn on September 15, 2026.

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