# Combining Forms Dictionary vs NAPA Filters

The clearest difference is price: NAPA Filters at Free against Combining Forms Dictionary's $0.99. NAPA Filters also leads on update cadence (monthly vs every 41 months). Combining Forms Dictionary's advantage is iOS requirement (11.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

NAPA Filters is free to download; Combining Forms Dictionary costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Combining Forms Dictionary ships an update every 41 months, NAPA Filters monthly. The most recent releases landed on September 23, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Combining Forms Dictionary | NAPA Filters |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/napa-filters/id6477851966/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Monthly** |
| Monetization | — | Free |
| Size | 88 MB | 67 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Trung Nguyen](https://appshunter.io/developer/1205541678) | [Premium Guard Inc.](https://appshunter.io/developer/1556625190) |

## What reviewers say

### Combining Forms Dictionary

[App page](https://appshunter.io/ios/app/combining-forms-dictionary/id1298588629)

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

**In-app purchases:** none


### NAPA Filters

[App page](https://appshunter.io/ios/app/napa-filters/id6477851966)

Easily find the right filters for your vehicle using a "Search By Vehicle" tool or a dynamic search option. You can also look up NAPA part numbers or interchange OE and competitor part numbers.

**Highlights:** Search by vehicle year, make, model, and engine, Dynamic search by typing vehicle description, Search by NAPA part number, Interchange OE or competitor part numbers, View product information

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Combining Forms Dictionary free?

Combining Forms Dictionary costs $0.99, with no in-app purchases.

### Is NAPA Filters free?

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

### Do Combining Forms Dictionary or NAPA Filters have ads?

Neither Combining Forms Dictionary nor NAPA Filters shows ads.

### Which is updated more often, Combining Forms Dictionary or NAPA Filters?

Combining Forms Dictionary ships an update every 41 months, and NAPA Filters monthly. Most recently, Combining Forms Dictionary was updated on September 23, 2026 and NAPA Filters on October 15, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*