# TempGrapher vs Frontier X

The clearest difference is review sentiment: Frontier X at 82% against TempGrapher's 27%. Frontier X also leads on price (Free vs $0.99) and rating (4.6 vs 1.0). TempGrapher's advantage is in-app purchases (none vs 2) and iOS requirement (14.0 vs 16.0). On ads and device support there is nothing between them.

Frontier X is free to download; TempGrapher costs $0.99 up front. Frontier X sells 2 in-app purchases, starting at $14.99 per month. TempGrapher asks for nothing beyond the download.

Frontier X holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Frontier X has 318 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 27% of TempGrapher's written reviews are positive against 82% of Frontier X's.

TempGrapher ships an update every 3 months, Frontier X every 2 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | TempGrapher | Frontier X |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/tempgrapher/id501935336/reviews) | **[4.6 (318 ratings)](https://appshunter.io/ios/app/frontier-x/id1483444499/reviews)** |
| Number of ratings | 1 | **318** |
| Positive reviews | 26.7% of reviews | **81.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 6 MB | 569 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [kazuhiko kuroda](https://appshunter.io/developer/460872954) | [Fourth Frontier Technologies Private Limited](https://appshunter.io/developer/1331846764) |

## What reviewers say

### TempGrapher

[App page](https://appshunter.io/ios/app/tempgrapher/id501935336)

Easily log your body temperature with a simple slider interface. View your temperature history as a line graph in both Celsius and Fahrenheit, with HealthKit support. Data is saved to your default calendar and can be shared via email or cloud services.

**Highlights:** Simple slider input for temperature, Celsius/Fahrenheit conversion, Line graph visualization, HealthKit integration, Calendar app data saving, CSV data export, Dark mode support

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

**In-app purchases:** none


### Frontier X

[App page](https://appshunter.io/ios/app/frontier-x/id1483444499)

Track your heart health and exercise performance with a smart chest strap wearable. Get detailed insights into heart rate, HRV, strain, and more, with personalized training feedback and alerts. Integrates with other devices and offers advanced analytics through a premium subscription.

**Highlights:** Heart health and performance tracking, Real-time heart rate and HRV monitoring, Personalized vibration alerts, Activity recording up to 24 hours, Integration with Bluetooth wearables, AI-enabled training insights, Metabolic Profile Analytics (Premium)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $14.99 | per month |
| Yearly | $119.99 | per year |

**What reviewers like**

- 🚀 Amazing device
- 👍 Great HR data and insight
- 👍 Helpful in gaining more data
- 👍 Fantastic concept with excellent execution
- 👍 Loads of useful information

**What reviewers complain about**

- 🐛 Worse and worse as time goes by
- 🐛 ECG doesn't work
- 🐛 Chest strap issues, device keeps popping out
- 🐛 Paywalled functionality
- 🐛 Syncing issues, device keeps disconnecting

**Reported bugs**

- ECG stopped working
- Inaccurate breathing rate and other metrics
- Inability to edit activity details for indoor workouts
- Syncing issues with Garmin devices after firmware updates

**Requested features**

- Add interval markers
- Improve integration with Apple Fitness/Fitness+
- Add support for ANT+
- Improve compatibility with other fitness apps and devices
- Add more customization options for workouts


## Frequently asked questions

### Is TempGrapher free?

TempGrapher costs $0.99, with no in-app purchases.

### Is Frontier X free?

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

### Which has better reviews, TempGrapher or Frontier X?

Frontier X is rated higher. TempGrapher averages 1.0 out of 5 from 1 ratings, while Frontier X averages 4.6 from 318 ratings.

### Do TempGrapher or Frontier X have ads?

Neither TempGrapher nor Frontier X shows ads.

### Which is updated more often, TempGrapher or Frontier X?

TempGrapher ships an update every 3 months, and Frontier X every 2 weeks. Most recently, TempGrapher was updated on October 30, 2026 and Frontier X on October 30, 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.*