# DaysyDay Partner vs ChainFlow

The clearest difference is rating: ChainFlow at 5.0 against DaysyDay Partner's 4.0. DaysyDay Partner's advantage is in-app purchases (none vs 1) and ratings volume (8 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ChainFlow sells 1 one-off in-app purchase. DaysyDay Partner asks for nothing beyond the download.

ChainFlow holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: DaysyDay Partner has 8 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 2, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | DaysyDay Partner | ChainFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (8 ratings)](https://appshunter.io/ios/app/daysyday-partner/id1533070954/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chainflow-interval-timer/id6755700190/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Freemium |
| Size | 56 MB | 22 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Valley Electronics](https://appshunter.io/developer/811106694) | [Michael Ebako-Hodgson](https://appshunter.io/developer/1855675493) |

## What reviewers say

### DaysyDay Partner

[App page](https://appshunter.io/ios/app/daysyday-partner/id1533070954)

This application allows users to view a partner's fertility data from another app. It displays past, present, and predicted fertility statuses, along with temperature curves and shared cycle details like menstruation and ovulation.

**Highlights:** View partner's fertility data, Calendar view of fertility status, Temperature curve overview, Share menstruation and ovulation data, Add personal notes, Comprehensive cycle understanding

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

**In-app purchases:** none


### ChainFlow

[App page](https://appshunter.io/ios/app/chainflow-interval-timer/id6755700190)

Create highly customized interval timers for any routine, from HIIT workouts to study sessions. Set unique work and rest periods for each segment, with clear audio cues and a distraction-free interface. Save your routines for easy access and hands-free operation.

**Highlights:** Custom interval chaining, Adjustable work/rest times per interval, Clear audio cues, Hands-free operation, Screen-off functionality, Routine saving, Dark interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChainFlow Pro | $4.99 | one-time |


## Frequently asked questions

### Is DaysyDay Partner free?

DaysyDay Partner is free to download, with no in-app purchases.

### Is ChainFlow free?

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

### Which has better reviews, DaysyDay Partner or ChainFlow?

ChainFlow is rated higher. DaysyDay Partner averages 4.0 out of 5 from 8 ratings, while ChainFlow averages 5.0 from 1 ratings.

### Do DaysyDay Partner or ChainFlow have ads?

Neither DaysyDay Partner nor ChainFlow shows ads.

### Which is updated more often, DaysyDay Partner or ChainFlow?

DaysyDay Partner ships an update every 2 months, and ChainFlow every 2 months. Most recently, DaysyDay Partner was updated on September 2, 2026 and ChainFlow on September 3, 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.*