# Solar PV Exam Revision vs CLF

Solar PV Exam Revision and CLF are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Solar PV Exam Revision sells 4 in-app purchases, starting at $9.99 per month and CLF sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Solar PV Exam Revision ships an update every 5 weeks, CLF every 2 months. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Solar PV Exam Revision | CLF |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Paid | — |
| Size | 26 MB | 27 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Eknath Kadam](https://appshunter.io/developer/465355268) | [Davy Raitt](https://appshunter.io/developer/1795318281) |

## What reviewers say

### Solar PV Exam Revision

[App page](https://appshunter.io/ios/app/solar-pv-exam-revision/id351685979)

Learn and test your knowledge of over 500 UK road and traffic signs. This app is essential for new drivers preparing for their theory test and beneficial for all road users to enhance safety.

**Highlights:** Study over 500 road signs, Cover flow interface, Quiz yourself, Prepare for theory test, Track progress, Re-attempt incorrect questions

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Quarterly | $19.99 | per 3 months |
| 6 Months | $24.99 | per 6 months |
| Yearly | $39.99 | per year |


### CLF

[App page](https://appshunter.io/ios/app/clf-c02-cloud-practitioner/id6746121070)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro Yearly | $14.99 | per year |
| Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Solar PV Exam Revision free?

Solar PV Exam Revision is free to download, with in-app purchases available.

### Is CLF free?

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

### Do Solar PV Exam Revision or CLF have ads?

Neither Solar PV Exam Revision nor CLF shows ads.

### Which is updated more often, Solar PV Exam Revision or CLF?

Solar PV Exam Revision ships an update every 5 weeks, and CLF every 2 months. Most recently, Solar PV Exam Revision was updated on November 6, 2026 and CLF on October 30, 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.*