# RetrofitReady vs DP

The clearest difference is in-app purchases: DP at none against RetrofitReady's 4. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. RetrofitReady sells 4 in-app purchases, starting at $9.99 per month. DP asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 27, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | RetrofitReady | DP |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | — |
| Size | 37 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

### RetrofitReady

[App page](https://appshunter.io/ios/app/retrofitready-dea-exam/id324520045)

This app aids Domestic Energy Assessor candidates and professionals with exam preparation, technical calculations, and quick reference guides for RdSAP and EPC standards. It includes a comprehensive toolkit for site surveys, job tracking, and professional development logging.

**Highlights:** 360 DEA revision questions, Topic-specific practice tests, Multiple calculators (ventilation, U-value, insulation), Searchable RdSAP and EPC glossary, Site survey and ventilation checklists, Assessment register and CPD log

**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 | $29.99 | per 6 months |
| Yearly | $39.99 | per year |


### DP

[App page](https://appshunter.io/ios/app/dp-800-sql-ai-developer-prep/id6772457661)

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

**In-app purchases:** none


## Frequently asked questions

### Is RetrofitReady free?

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

### Is DP free?

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

### Do RetrofitReady or DP have ads?

Neither RetrofitReady nor DP shows ads.

### Which is updated more often, RetrofitReady or DP?

RetrofitReady ships an update every 3 months, and DP every 3 months. Most recently, RetrofitReady was updated on October 27, 2026 and DP on October 14, 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.*