# Base Builder vs TachyMon

The clearest difference is in-app purchases: Base Builder at none against TachyMon's 2. Base Builder also leads on update cadence (monthly vs every 3 months) and iOS requirement (13.0 vs 16.4). TachyMon's advantage is rating (3.8 vs 3.4) and review sentiment (58% vs 33%). On price, 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. Base Builder asks for nothing beyond the download.

TachyMon holds the better App Store score, 3.8 against 3.4. That said, the two scores are not equally well evidenced: TachyMon has 286 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 33% of Base Builder's written reviews are positive against 58% of TachyMon's.

Base Builder ships an update monthly, TachyMon every 3 months. The most recent releases landed on September 30, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Base Builder | TachyMon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (7 ratings)](https://appshunter.io/ios/app/base-builder/id1546116629/reviews) | **[3.8 (286 ratings)](https://appshunter.io/ios/app/tachymon/id1603517412/reviews)** |
| Number of ratings | 7 | **286** |
| Positive reviews | 33.3% of reviews | **57.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 36 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 9+ |
| Developer | [Douglas Curtis](https://appshunter.io/developer/1546116631) | [Whip Development Inc.](https://appshunter.io/developer/1603514887) |

## What reviewers say

### Base Builder

[App page](https://appshunter.io/ios/app/base-builder/id1546116629)

Receive timely heart rate alerts and audio cues to stay within your target workout effort. Integrates with the Health app, providing detailed voice feedback on distance, pace, and heart rates. Haptic alerts notify you when you exceed heart rate limits.

**Highlights:** Heart rate alerts, Audio cues for distance and pace, Haptic feedback for heart rate limits, Health app integration, Customizable workout statistics announcements

**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 Base Builder free?

Base Builder 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, Base Builder or TachyMon?

TachyMon is rated higher. Base Builder averages 3.4 out of 5 from 7 ratings, while TachyMon averages 3.8 from 286 ratings.

### Do Base Builder or TachyMon have ads?

Neither Base Builder nor TachyMon shows ads.

### Which is updated more often, Base Builder or TachyMon?

Base Builder ships an update monthly, and TachyMon every 3 months. Most recently, Base Builder was updated on September 30, 2026 and TachyMon on October 12, 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.*