# Sunline vs Solar Calibrator

The clearest difference is review sentiment: Solar Calibrator at 100% against Sunline's 50%. Solar Calibrator also leads on rating (5.0 vs 3.8). Sunline's advantage is price (Free vs $9.99) and update cadence (every 4 months vs every 10 months). On ads, in-app purchases and device support there is nothing between them.

Sunline is free to download; Solar Calibrator costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Solar Calibrator holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 6 and 2 respectively. Written reviews point the same way: 50% of Sunline's written reviews are positive against 100% of Solar Calibrator's.

Sunline ships an update every 4 months, Solar Calibrator every 10 months. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Sunline | Solar Calibrator |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [3.8 (6 ratings)](https://appshunter.io/ios/app/sunline/id1494807667/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/solar-calibrator/id1636630984/reviews)** |
| Number of ratings | **6** | 2 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 10 months |
| Monetization | **Free** | Paid |
| Size | 7 MB | 40 MB |
| Requires iOS | **11.1** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Drift Innovation Ltd](https://appshunter.io/developer/579007701) | [Fawzi Fakhro](https://appshunter.io/developer/1636630986) |

## What reviewers say

### Sunline

[App page](https://appshunter.io/ios/app/sunline/id1494807667)

This device combines inverter, solar charger, and battery charger functions for portable, uninterruptible power. Its LCD display allows easy configuration of charging current, power source priority, and input voltage.

**Highlights:** Multi-function inverter/charger, Solar charger capability, Battery charger capability, Uninterruptible power support, Comprehensive LCD display, User-configurable settings

**Features:** macOS Compatibility

**In-app purchases:** none


### Solar Calibrator

[App page](https://appshunter.io/ios/app/solar-calibrator/id1636630984)

This professional toolkit helps PV installers precisely calibrate panel angles, size battery banks and wire gauges, and generate PDF quotes. It includes tools for obstruction analysis and load auditing, all accessible offline.

**Highlights:** Solar compass and tilt angle calibration, Battery and inverter sizing, Wire gauge calculation, Load audit and quote builder, PV array and string sizing, Obstruction analysis, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is Sunline free?

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

### Is Solar Calibrator free?

Solar Calibrator costs $9.99, with no in-app purchases.

### Which has better reviews, Sunline or Solar Calibrator?

Solar Calibrator is rated higher. Sunline averages 3.8 out of 5 from 6 ratings, while Solar Calibrator averages 5.0 from 2 ratings.

### Do Sunline or Solar Calibrator have ads?

Neither Sunline nor Solar Calibrator shows ads.

### Which is updated more often, Sunline or Solar Calibrator?

Sunline ships an update every 4 months, and Solar Calibrator every 10 months. Most recently, Sunline was updated on November 3, 2026 and Solar Calibrator on November 12, 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.*