# SolarZero vs Flightbook

The clearest difference is in-app purchases: SolarZero at none against Flightbook's 3. Flightbook's advantage is update cadence (every 2 weeks vs monthly) and iOS requirement (15.5 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Flightbook sells 3 one-off in-app purchases. SolarZero asks for nothing beyond the download.

SolarZero ships an update monthly, Flightbook every 2 weeks. The most recent releases landed on September 23, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | SolarZero | Flightbook |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 35.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 22 MB | 59 MB |
| Requires iOS | 17.0 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [solarZero Limited](https://appshunter.io/developer/1283894275) | [F-JAP INDUSTRIES LIMITED](https://appshunter.io/developer/1866287681) |

## What reviewers say

### SolarZero

[App page](https://appshunter.io/ios/app/solarzero/id6504657190)

Monitor and optimize your home's solar energy system with real-time data on energy generation and usage. Track carbon savings, access energy-saving modes, and refer friends to the service.

**Highlights:** Real-time energy generation and usage data, Energy import/export status updates, Carbon savings and footprint tracking, Hot water energy saving mode, Refer-a-Friend program

**In-app purchases:** none


### Flightbook

[App page](https://appshunter.io/ios/app/flightbook/id6792990197)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5 credits | $2.99 | one-time |
| 20 credits | $9.99 | one-time |
| 50 credits | $19.99 | one-time |


## Frequently asked questions

### Is SolarZero free?

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

### Is Flightbook free?

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

### Do SolarZero or Flightbook have ads?

Neither SolarZero nor Flightbook shows ads.

### Which is updated more often, SolarZero or Flightbook?

SolarZero ships an update monthly, and Flightbook every 2 weeks. Most recently, SolarZero was updated on September 23, 2026 and Flightbook 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.*