# SRT INT vs WattShift

The clearest difference is update cadence: WattShift at every 3 weeks against SRT INT's every 2 months. SRT INT's advantage is iOS requirement (13.0 vs 16.0). On price, rating, ratings volume 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 SRT INT against 5.0 for WattShift. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

SRT INT ships an update every 2 months, WattShift every 3 weeks. The most recent releases landed on June 4, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | SRT INT | WattShift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/srt-int/id1600503406/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/wattshift/id6446374436/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 38 MB | 6 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Schwab Retirement Technologies Inc.](https://appshunter.io/developer/1558174243) | [WattShift, Inc.](https://appshunter.io/developer/1578777527) |

## What reviewers say

### SRT INT

[App page](https://appshunter.io/ios/app/srt-int/id1600503406)

Manage your retirement savings on the go. Securely access account details, track performance, and update investment choices. The app also offers educational resources and tools to forecast your retirement income.

**Highlights:** Biometric login, Check account balances and performance, Update investment elections, Secure document upload, Retirement income forecast, Educational videos, Manage beneficiaries

**In-app purchases:** none


### WattShift

[App page](https://appshunter.io/ios/app/wattshift/id6446374436)

This app intelligently manages your home thermostat to prioritize the use of renewable energy sources like solar and wind. It automatically shifts cooling and heating schedules to times when energy is cleaner and cheaper, potentially reducing your electricity bill by up to 30% without compromising comfort.

**Highlights:** Maximizes solar and wind energy use, Reduces electricity bills up to 30%, Maintains full comfort and temperature control, Syncs with smart home devices, Automatically shifts thermostat usage, Prioritizes cleaner energy sources

**In-app purchases:** none


## Frequently asked questions

### Is SRT INT free?

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

### Is WattShift free?

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

### Which has better reviews, SRT INT or WattShift?

SRT INT and WattShift are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do SRT INT or WattShift have ads?

Neither SRT INT nor WattShift shows ads.

### Which is updated more often, SRT INT or WattShift?

SRT INT ships an update every 2 months, and WattShift every 3 weeks. Most recently, SRT INT was updated on June 4, 2026 and WattShift on June 1, 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.*