# SLT vs Heatwise New

SLT and Heatwise New both sit at 5.0 stars, but that hides the real split: 100% of Heatwise New's written reviews are positive against 71% of SLT's. SLT's advantage is monetization model (ad-supported vs free with in-app purchases) and ratings volume (3.3K vs 674). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for SLT against 5.0 for Heatwise New. Both are backed by a comparable volume of ratings — 3.3K and 674 respectively. Written reviews are what separate them: 71% of SLT's written reviews are positive against 100% of Heatwise New's.

SLT ships an update every 4 weeks, Heatwise New monthly. The most recent releases landed on September 23, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | SLT | Heatwise New |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3.3K ratings)](https://appshunter.io/ios/app/slt/id1473159998/reviews) | [5.0 (674 ratings)](https://appshunter.io/ios/app/heatwise-new/id1504908056/reviews) |
| Number of ratings | **3.3K** | 674 |
| Positive reviews | 71.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Monthly |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 38 MB | 38 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mariana Tek Corporation](https://appshunter.io/developer/1178746980) | [Heatwise](https://appshunter.io/developer/1472501563) |

## What reviewers say

### SLT

[App page](https://appshunter.io/ios/app/slt/id1473159998)

Book and manage fitness classes directly from your phone. View studio schedules, purchase class packages, and access your account information. Stay connected with the studio through social media links.

**Highlights:** Book classes, View studio schedules, Purchase class packages, Manage account, View reservations, Find studio locations

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

**In-app purchases:** none


### Heatwise New

[App page](https://appshunter.io/ios/app/heatwise-new/id1504908056)

Book your next sauna session with this app. Browse studio locations, view class schedules, and manage your reservations. Purchase classes and workshops, and update your account details all in one place.

**Highlights:** Find and book sauna sessions, View studio locations, Check class schedules, Review existing reservations, Purchase classes and workshops, Manage your account

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

**In-app purchases:** none


## Frequently asked questions

### Is SLT free?

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

### Is Heatwise New free?

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

### Which has better reviews, SLT or Heatwise New?

SLT and Heatwise New are both rated 5.0 out of 5 on the App Store, from 3.3K and 674 ratings respectively.

### Do SLT or Heatwise New have ads?

Neither SLT nor Heatwise New shows ads.

### Which is updated more often, SLT or Heatwise New?

SLT ships an update every 4 weeks, and Heatwise New monthly. Most recently, SLT was updated on September 23, 2026 and Heatwise New on September 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.*