# Overkill Solar vs Bound

The clearest difference is in-app purchases: Overkill Solar at none against Bound's 1. Overkill Solar also leads on device support (3 vs 1) and iOS requirement (13.4 vs 18.6). On price, update cadence and ads there is nothing between them.

Both are free to download. Bound sells 1 one-off in-app purchase. Overkill Solar asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 28, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Overkill Solar | Bound |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (16 ratings)](https://appshunter.io/ios/app/overkill-solar/id6444233824/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | — |
| Size | 21 MB | 13 MB |
| Requires iOS | **13.4** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Overkill Solar LLC](https://appshunter.io/developer/1653276724) | [Ryan Baumbach](https://appshunter.io/developer/1163665496) |

## What reviewers say

### Overkill Solar

[App page](https://appshunter.io/ios/app/overkill-solar/id6444233824)

This app connects to a solar battery management system to provide detailed monitoring and control. Users can track cell voltage, capacity, current, and manage charging/discharging ports. It also offers advanced configuration options for calibration, balancing, and protection settings.

**Highlights:** Monitor cell voltage and capacity, Control charging and discharging ports, Calibrate voltage and current, Configure balancer and protection values, Log voltage, current, and power, Monitor BMS alarms and temperature

**Features:** macOS Compatibility

**In-app purchases:** none


### Bound

[App page](https://appshunter.io/ios/app/bound-private-vault/id6764484161)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Files | $2.99 | one-time |


## Frequently asked questions

### Is Overkill Solar free?

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

### Is Bound free?

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

### Do Overkill Solar or Bound have ads?

Neither Overkill Solar nor Bound shows ads.

### Which is updated more often, Overkill Solar or Bound?

Overkill Solar ships an update every 4 months, and Bound every 4 months. Most recently, Overkill Solar was updated on September 28, 2026 and Bound on October 6, 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.*