# WHILL Model Ci vs TachyMon

WHILL Model Ci and TachyMon both sit at 3.6 stars, but that hides the real split: 58% of TachyMon's written reviews are positive against 0% of WHILL Model Ci's. TachyMon also leads on update cadence (every 3 months vs every 13 months) and ratings volume (288 vs 11). WHILL Model Ci's advantage is in-app purchases (none vs 2) and iOS requirement (10.0 vs 16.4). On price, rating, ads and device support there is nothing between them.

Both are free to download. TachyMon sells 2 in-app purchases, starting at $2.99 per month. WHILL Model Ci asks for nothing beyond the download.

TachyMon holds the better App Store score, 3.8 against 3.6. That said, the two scores are not equally well evidenced: TachyMon has 288 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 0% of WHILL Model Ci's written reviews are positive against 58% of TachyMon's.

WHILL Model Ci ships an update every 13 months, TachyMon every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | WHILL Model Ci | TachyMon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (11 ratings)](https://appshunter.io/ios/app/whill-model-ci/id1328793699/reviews) | **[3.8 (288 ratings)](https://appshunter.io/ios/app/tachymon/id1603517412/reviews)** |
| Number of ratings | 11 | **288** |
| Positive reviews | 0.0% of reviews | **58.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 65 MB | 36 MB |
| Requires iOS | **10.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 9+ |
| Developer | [WHILL, Inc.](https://appshunter.io/developer/914238820) | [Whip Development Inc.](https://appshunter.io/developer/1603514887) |

## What reviewers say

### WHILL Model Ci

[App page](https://appshunter.io/ios/app/whill-model-ci/id1328793699)

Control a personal electric vehicle remotely, monitor travel distance and total mileage, and adjust speed settings. This application enhances the user experience for the WHILL Model Ci.

**Highlights:** Remote control functionality, Track traveling distance, Monitor total mileage, Adjust speed settings

**In-app purchases:** none


### TachyMon

[App page](https://appshunter.io/ios/app/tachymon/id1603517412)

Receive immediate alerts for significant heart rate fluctuations, ideal for conditions like POTS or during exercise. Customize thresholds and receive detailed event tracking. Premium features offer advanced data visualization and reporting.

**Highlights:** Customizable heart rate threshold alerts, Haptic feedback for alerts, Real-time heart rate and average display, Alert event tracking and logging, Temporary alert silencing, Detailed monitoring data review, Shareable PDF reports (premium)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TachyMon Premium Monthly | $2.99 | per month |
| TachyMon Premium Annual | $19.99 | per year |

**What reviewers like**

- 🚀 Continuous monitoring
- 🚨 Helpful alerts for heart rate spikes/drops
- 📊 Useful data tracking and visualization
- 🤖 Customizable settings and thresholds
- 💯 Accurate heart rate measurements

**What reviewers complain about**

- 🔋 Drains Apple Watch battery quickly
- 🔒 Paywalled features that were previously free
- 🤯 Buggy and unreliable at times
- 📱 Lack of companion iPhone app for data review
- 🔇 Limited notification/alert customization

**Reported bugs**

- Frequent disconnections from heart rate monitor
- Inconsistent data sync between watch and phone
- Inability to reinstall app on new devices
- Freezing and crashing issues on latest updates

**Requested features**

- Add ability to log symptoms and notes
- Implement emergency contact alerts
- Improve data export and sharing options
- Enhance graphing and trend analysis tools
- Optimize battery usage and background monitoring


## Frequently asked questions

### Is WHILL Model Ci free?

WHILL Model Ci is free to download, with no in-app purchases.

### Is TachyMon free?

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

### Which has better reviews, WHILL Model Ci or TachyMon?

TachyMon is rated higher. WHILL Model Ci averages 3.6 out of 5 from 11 ratings, while TachyMon averages 3.8 from 288 ratings.

### Do WHILL Model Ci or TachyMon have ads?

Neither WHILL Model Ci nor TachyMon shows ads.

### Which is updated more often, WHILL Model Ci or TachyMon?

WHILL Model Ci ships an update every 13 months, and TachyMon every 3 months. Most recently, WHILL Model Ci was updated on November 6, 2026 and TachyMon on November 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.*