# Legacy TriDot vs Zygo

The clearest difference is review sentiment: Legacy TriDot at 97% against Zygo's 43%. Legacy TriDot also leads on rating (4.7 vs 4.2) and update cadence (fortnightly vs every 2 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Legacy TriDot sells 5 in-app purchases, starting at $14.99 per month and Zygo sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Legacy TriDot holds the better App Store score, 4.7 against 4.2. Both are backed by a comparable volume of ratings — 263 and 135 respectively. Written reviews point the same way: 97% of Legacy TriDot's written reviews are positive against 43% of Zygo's.

Legacy TriDot ships an update fortnightly, Zygo every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Legacy TriDot | Zygo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (263 ratings)](https://appshunter.io/ios/app/legacy-tridot/id1189088069/reviews)** | [4.2 (135 ratings)](https://appshunter.io/ios/app/zygo/id1564866603/reviews) |
| Number of ratings | **263** | 135 |
| Positive reviews | **97.0% of reviews** | 42.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 95 MB | 101 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Predictive Fitness, Inc.](https://appshunter.io/developer/1189088068) | [Swimmersive Co](https://appshunter.io/developer/1381489863) |

## What reviewers say

### Legacy TriDot

[App page](https://appshunter.io/ios/app/legacy-tridot/id1189088069)

This app uses big data and advanced analytics to optimize your future training and race results. It seamlessly auto-syncs with popular fitness tracking devices.

**Highlights:** Big data analytics, Optimized future training, Race result prediction, Seamless auto-sync, Garmin integration, Polar integration

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifestyle | $14.99 | per month |
| Essentials | $39.99 | per month |
| Complete | $99.99 | per month |
| Mark Allen Edition | $149.99 | per month |
| Premium | $249.99 | per month |

**What reviewers like**

- 🚀 Personalized training plans
- 👍 Easy to use and follow
- 🚀 Customized to user's fitness level
- 🚀 Efficient training with less time
- 👍 Injury-free training

**What reviewers complain about**

- 🐛 Occasional app performance issues
- 🔍 Steep learning curve for some features
- 🔍 Limited manual workout customization

**Reported bugs**

- Login issues
- Syncing problems with third-party apps

**Requested features**

- Perceived effort tracking
- More flexibility in workout scheduling


### Zygo

[App page](https://appshunter.io/ios/app/zygo/id1564866603)

Access over 500 guided swim workouts paired with music. Track your progress with lap counting and a tempo trainer. Stay connected with walkie-talkie functionality and manage device settings.

**Highlights:** 500+ guided swim workouts, Music integration, Lap counting, Tempo trainer, Walkie-talkie feature, Battery level monitoring, Firmware updates

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Yearly Subscription | $49.99 | per year |


## Frequently asked questions

### Is Legacy TriDot free?

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

### Is Zygo free?

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

### Which has better reviews, Legacy TriDot or Zygo?

Legacy TriDot is rated higher. Legacy TriDot averages 4.7 out of 5 from 263 ratings, while Zygo averages 4.2 from 135 ratings.

### Do Legacy TriDot or Zygo have ads?

Neither Legacy TriDot nor Zygo shows ads.

### Which is updated more often, Legacy TriDot or Zygo?

Legacy TriDot ships an update fortnightly, and Zygo every 2 months. Most recently, Legacy TriDot was updated on November 2, 2026 and Zygo 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.*