Not Emacs vs Möbius Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Not Emacs
A programmer's text editor that mimics common Emacs keybindings and supports iCloud document syncing across devices. It offers syntax highlighting for several languages and is optimized for external keyboards, with an extended virtual keyboard as a backup.
- Emacs keybinding support
- iCloud document editing
- Syntax highlighting (Lisp, Scheme, JS, CSS, XML)
- External Bluetooth keyboard optimization
- Extended virtual keyboard
Read full descriptionHide full description
Not Emacs is a text editor for programmers that supports many of the most common emacs keybindings. It allows editing iCloud documents that are automatically available from other devices. The app has been designed to be used with an external Bluetooth keyboard, but if you forgot it at home, it is still possible to get by with the extended virtual keyboard. This app is based on the ymacs editor (http://www.ymacs.org) and the Gambit Scheme programming system (http://gambitscheme.org). It has syntax highlighting for the following languages: Lisp, Scheme, JavaScript, CSS and XML.
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.
- 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
Read full descriptionHide 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).
Screenshots
Verdict
The clearest difference is in-app purchases: Not Emacs at none against Möbius Sync's 1. Not Emacs also leads on update cadence (every 2 weeks vs every 2 months) and iOS requirement (6.1 vs 14.1). Möbius Sync's advantage is ratings volume (140 vs 21). On price, rating, review sentiment and ads 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
Both are free to download. Möbius Sync sells 1 one-off in-app purchase. Not Emacs asks for nothing beyond the download.
Not Emacs holds the better App Store score, 4.0 against 3.8. That said, the two scores are not equally well evidenced: Möbius Sync has 140 ratings behind it against 21, so its average is the more settled of the two. Written reviews complicate that: 50% of Not Emacs's written reviews are positive against 55% of Möbius Sync's, so the app with the better star average is not the one people write more warmly about.
Not Emacs ships an update every 2 weeks, Möbius Sync every 2 months. The most recent releases landed on October 16, 2026 and October 21, 2026 respectively.
| Parameter | Not Emacs | Möbius Sync |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (21 ratings) — better | 3.8 (140 ratings) |
| Positive reviews | 50.0% of reviews | 55.0% of reviews — better |
| Number of ratings | 21 | 140 — better |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 6.1 — better | 14.1 |
| Further details — not scored | ||
| Size | 18 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Marc Feeley | Pickup Infinity Limited |
Customer experience
Not Emacs
Möbius Sync
Bugs and requests
Not Emacs
Not enough reviews yet to summarise bugs or 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 moreShow fewer
- 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 moreShow fewer
- 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
In-app purchases
Not Emacs
No in-app purchases
Möbius Sync
- Unlimited file sync$4.99
