SynoSync vs Mellow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SynoSync
This app synchronizes files between your iOS device and Synology NAS, WebDAV, or SMB servers. It integrates seamlessly with the iOS Files app, offering multiple sync modes and conflict resolution options for efficient file management.
- Synology NAS, WebDAV, SMB support
- iOS Files app integration
- Server-to-Local sync
- Local-to-Server sync
- Two-Way synchronization
- Flexible conflict resolution
- Background syncing
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SynoSync is a file synchronization tool crafted for iPhone and iPad, supporting Synology NAS, WebDAV, and SMB services. It is specifically designed to solve the long-standing issue where traditional sync software cannot flexibly integrate into the iOS "Files" app workflow. Simply log into your server, select a shared directory, and use the system file picker to specify a local target—allowing you to sync files to any authorized directory accessible by the Files app. The app supports three sync modes: Server-to-Local, Local-to-Server, and Two-Way synchronization, while offering flexible conflict resolution strategies (Keep Newer, Keep Local, Keep Remote, or Keep Both). With support for extended foreground syncing and automatic background syncing, it is the perfect tool for long-term maintenance of note libraries, document repositories, research data, and project files.
Mellow
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Thoughts do not always arrive as finished text. Sometimes you want to say a message better, capture an idea, or put an important task on your schedule. Mellow is an AI writing and capture assistant built around voice and text. You explicitly choose Rewrite, Quick Note, or Arrange. Mellow never guesses the mode, sends a message, or writes to your calendar automatically. THREE WAYS TO USE MELLOW • Rewrite: preserve your intent while making a message clearer and more considerate for the audience you choose • Quick Note: faithfully turn spontaneous ideas and observations into a readable title and natural paragraphs • Arrange: extract the task, relative time, place, and things to bring into a draft card, then decide whether to add it to Calendar, Reminders, or an alarm KEY FEATURES • Voice or text input: choose hold-to-talk or tap-to-start/stop, or stay entirely in text • Scene templates: control audience, tone, and writing guidelines, or create your own scene • Knowledge Base: save specialist terms, names, and common variants for consistent use in speech recognition, Rewrite, Quick Note, and Arrange; optionally sync them across signed-in Mac, iPhone, and iPad devices • Share extension: send selected text to Mellow from the system Share menu • Saving and connectors: use the system share sheet for Apple Notes, or sign in and explicitly save a selected Quick Note to Notion • Local records: Rewrite, Quick Note, and Arrange records stay on your device and can be deleted or disabled YOU STAY IN CONTROL Mellow never sends messages or creates schedules on its own. Every AI-generated result is labeled and shown to you first, so you can review, edit, copy, share, or save it. PRIVACY Mellow does not upload or store microphone audio. Only text and necessary context you explicitly submit to Rewrite, Quick Note, or Arrange is sent to Mellow Cloud. Knowledge Base entries stay local by default and can sync with your account when enabled. Connecting Notion sends no note by itself; Mellow sends a title and body only after you explicitly save that note. Mellow helps you put down what you want to say, what you just thought of, and what you need to do.
Screenshots
Verdict
The clearest difference is in-app purchases: Mellow at none against SynoSync's 1. SynoSync's advantage is update cadence (every 4 days vs every 10 days). On price, ads, device support 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
Both are free to download. SynoSync sells 1 one-off in-app purchase. Mellow asks for nothing beyond the download.
SynoSync ships an update every 4 days, Mellow every 10 days. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.
| Parameter | SynoSync | Mellow |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 days — better | Every 10 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 20 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | 成豪 董 | 海鑫 李 |
In-app purchases
SynoSync
- SynoSync-Plus$4.99
Mellow
No in-app purchases









