# Solar PV NABCEP Exam Prep vs Chartle

The clearest difference is update cadence: Chartle at every 2 days against Solar PV NABCEP Exam Prep's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Solar PV NABCEP Exam Prep sells 4 in-app purchases, starting at $6.99 per 7 days and Chartle sells 1 in-app purchase, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Solar PV NABCEP Exam Prep ships an update every 3 months, Chartle every 2 days. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Solar PV NABCEP Exam Prep | Chartle |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (40 ratings)](https://appshunter.io/ios/app/chartle-candlestick-patterns/id6798367721/reviews)** |
| Number of ratings | — | **40** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | — | Freemium |
| Size | 24 MB | 64 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [FLY SKY PTY LTD](https://appshunter.io/developer/1838696534) | [Buffalo Studio](https://appshunter.io/developer/6798367813) |

## What reviewers say

### Solar PV NABCEP Exam Prep

[App page](https://appshunter.io/ios/app/solar-pv-nabcep-exam-prep/id6779026836)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Solar PV Weekly | $6.99 | per 7 days |
| Solar PV Monthly | $16.99 | per month |
| Solar PV Yearly | $39.99 | per year |
| Solar PV Lifetime | $79.99 | one-time |


### Chartle

[App page](https://appshunter.io/ios/app/chartle-candlestick-patterns/id6798367721)

Learn to interpret stock price charts through interactive quizzes. Practice identifying and predicting outcomes of various candlestick patterns using real historical market data. Build a daily habit of chart analysis to improve your trading understanding.

**Highlights:** Interactive chart pattern quizzes, Real historical market data, Pattern outcome prediction, Daily challenges and streaks, Progress tracking with mastery ring, Lessons on pattern formation and failure

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chartle Pro | $6.99 | per 7 days |


## Frequently asked questions

### Is Solar PV NABCEP Exam Prep free?

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

### Is Chartle free?

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

### Do Solar PV NABCEP Exam Prep or Chartle have ads?

Neither Solar PV NABCEP Exam Prep nor Chartle shows ads.

### Which is updated more often, Solar PV NABCEP Exam Prep or Chartle?

Solar PV NABCEP Exam Prep ships an update every 3 months, and Chartle every 2 days. Most recently, Solar PV NABCEP Exam Prep was updated on October 2, 2026 and Chartle on October 8, 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.*