# OnceOne vs Duoflow

The clearest difference is update cadence: Duoflow at every 3 days against OnceOne's weekly. OnceOne's advantage is iOS requirement (18.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. OnceOne sells 3 in-app purchases, starting at $0.99 per month and Duoflow sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

OnceOne ships an update weekly, Duoflow every 3 days. The most recent releases landed on September 5, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | OnceOne | Duoflow |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 3 MB | 72 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dongliang Yin](https://appshunter.io/developer/1030365061) | [Tianjin Ruikai Technology Co., Ltd](https://appshunter.io/developer/1766739205) |

## What reviewers say

### OnceOne

[App page](https://appshunter.io/ios/app/onceone-grouping-to-do-tasks/id6744550176)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro(Monthly) | $0.99 | per month |
| Pro(Annual) | $9.99 | per year |
| Pro(Lifetime) | $24.99 | one-time |


### Duoflow

[App page](https://appshunter.io/ios/app/duoflow/id6767079360)

Record notes, to-dos, and diaries through a chat interface. Customize chat bubbles for visual organization and easily manage different content types. Syncs seamlessly across Apple devices via iCloud.

**Highlights:** Chat-based recording, Customizable chat bubbles, Multiple message types (text, image, video, audio, location), Multiple conversation groups, iCloud synchronization, Cross-device continuity

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 连续包月 | $0.99 | per month |
| 年度会员 | $4.99 | per year |
| 永久会员 | $6.99 | one-time |


## Frequently asked questions

### Is OnceOne free?

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

### Is Duoflow free?

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

### Do OnceOne or Duoflow have ads?

Neither OnceOne nor Duoflow shows ads.

### Which is updated more often, OnceOne or Duoflow?

OnceOne ships an update weekly, and Duoflow every 3 days. Most recently, OnceOne was updated on September 5, 2026 and Duoflow on September 1, 2026.

---

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