# Timeruler HRSpectacles vs Flow21 Systems

The clearest difference is update cadence: Timeruler HRSpectacles at every 3 days against Flow21 Systems's every 2 months. Timeruler HRSpectacles also leads on iOS requirement (12.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Timeruler HRSpectacles ships an update every 3 days, Flow21 Systems every 2 months. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Timeruler HRSpectacles | Flow21 Systems |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 months |
| Size | 51 MB | 335 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [DxForm](https://appshunter.io/developer/1504267171) | [Flow21 Systems](https://appshunter.io/developer/1785598054) |

## What reviewers say

### Timeruler HRSpectacles

[App page](https://appshunter.io/ios/app/timeruler-hrspectacles/id1618615390)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flow21 Systems

[App page](https://appshunter.io/ios/app/flow21-systems/id6739488079)

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Timeruler HRSpectacles free?

Timeruler HRSpectacles is free to download, with no in-app purchases.

### Is Flow21 Systems free?

Flow21 Systems is free to download, with no in-app purchases.

### Do Timeruler HRSpectacles or Flow21 Systems have ads?

Neither Timeruler HRSpectacles nor Flow21 Systems shows ads.

### Which is updated more often, Timeruler HRSpectacles or Flow21 Systems?

Timeruler HRSpectacles ships an update every 3 days, and Flow21 Systems every 2 months. Most recently, Timeruler HRSpectacles was updated on October 1, 2026 and Flow21 Systems on September 30, 2026.

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