# Polar Flow vs IKI

The clearest difference is rating: Polar Flow at 4.6 against IKI's 2.5. Polar Flow also leads on update cadence (monthly vs every 21 months) and ratings volume (50K vs 6). IKI's advantage is in-app purchases (none vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Polar Flow sells 1 in-app purchase, starting at $8.99 per month. IKI asks for nothing beyond the download.

Polar Flow holds the better App Store score, 4.6 against 2.5. That said, the two scores are not equally well evidenced: Polar Flow has 50K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 50% of Polar Flow's written reviews are positive against 33% of IKI's.

Polar Flow ships an update monthly, IKI every 21 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Polar Flow | IKI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (50K ratings)](https://appshunter.io/ios/app/polar-flow/id717172678/reviews)** | [2.5 (6 ratings)](https://appshunter.io/ios/app/iki/id1577358573/reviews) |
| Number of ratings | **50K** | 6 |
| Positive reviews | **49.6% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 21 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 189 MB | 42 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Polar Electro](https://appshunter.io/developer/532468555) | [HUUM](https://appshunter.io/developer/896161047) |

## What reviewers say

### Polar Flow

[App page](https://appshunter.io/ios/app/polar-flow/id717172678)

This app helps you track daily activity, analyze workouts with detailed metrics, and gain insights into sleep patterns and recovery. It allows for device management, route planning, and seamless syncing with other popular fitness platforms.

**Highlights:** Activity Tracking, Training Analysis, Sleep Insights, Training Load & Recovery, Device & Profile Management, Wireless Syncing, Third-Party Service Integration

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Polar Fitness Program | $8.99 | per month |

**What reviewers like**

- 🚀 Accurate heart rate monitoring
- 🔋 Good battery life
- 👍 Detailed workout data and analysis
- 👍 Intuitive and user-friendly app
- 👍 Seamless syncing with Polar devices

**What reviewers complain about**

- 🐛 Connectivity and syncing issues
- 🐛 Unreliable sleep tracking
- 🐛 Slow GPS initialization
- 👎 Cluttered and confusing app interface
- 👎 Limited customization options

**Reported bugs**

- App crashes during syncing
- Inconsistent data sync between watch and app
- Firmware updates causing loss of user data

**Requested features**

- Ability to manually edit workout data
- Integration with more third-party apps
- More advanced training programs and coaching
- Improved sleep tracking and analysis


### IKI

[App page](https://appshunter.io/ios/app/iki/id1577358573)

Control your Finnish sauna heater remotely from your smartphone. Schedule heating times and monitor the temperature to ensure a perfectly hot sauna experience upon arrival.

**Highlights:** Remote sauna heating, Temperature monitoring, Timed start functionality, Calendar style bookings, Heating notifications

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Polar Flow free?

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

### Is IKI free?

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

### Which has better reviews, Polar Flow or IKI?

Polar Flow is rated higher. Polar Flow averages 4.6 out of 5 from 50K ratings, while IKI averages 2.5 from 6 ratings.

### Do Polar Flow or IKI have ads?

Neither Polar Flow nor IKI shows ads.

### Which is updated more often, Polar Flow or IKI?

Polar Flow ships an update monthly, and IKI every 21 months. Most recently, Polar Flow was updated on October 29, 2026 and IKI on October 24, 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.*