# SiYuan vs Fydra

The clearest difference is device support: Fydra at 4 against SiYuan's 2. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. SiYuan sells 2 one-off in-app purchases and Fydra sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

SiYuan ships an update every 8 days, Fydra every 10 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | SiYuan | Fydra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (30 ratings)](https://appshunter.io/ios/app/siyuan/id1583226508/reviews)** | — |
| Number of ratings | **30** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 10 days |
| Monetization | Free with in-app purchases | — |
| Size | 440 MB | 5 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Yunnan Liandi Technology Co., Ltd.](https://appshunter.io/developer/1583226510) | [Radimir Bitsov](https://appshunter.io/developer/1895054079) |

## What reviewers say

### SiYuan

[App page](https://appshunter.io/ios/app/siyuan/id1583226508)

A privacy-focused personal knowledge management system that allows offline use and encrypted data synchronization. It combines blocks, outlines, and bidirectional links to enhance thinking processes.

**Highlights:** Privacy-first design, Offline data storage, End-to-end encrypted sync, Block and outline fusion, Bidirectional linking

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Features | $79.99 | one-time |
| Subscription | $188.99 | one-time |


### Fydra

[App page](https://appshunter.io/ios/app/fydra-secure-notes-and-ssh-keys/id6762874925)

**Features:** Family Sharing, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fydra Pro Monthly | $2.99 | per month |
| Fydra Pro Yearly | $17.99 | per year |
| Fydra Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is SiYuan free?

SiYuan is free to download, with in-app purchases available.

### Is Fydra free?

Fydra is free to download, with in-app purchases available.

### Do SiYuan or Fydra have ads?

Neither SiYuan nor Fydra shows ads.

### Which is updated more often, SiYuan or Fydra?

SiYuan ships an update every 8 days, and Fydra every 10 days. Most recently, SiYuan was updated on November 3, 2026 and Fydra on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*