# BuildSpec vs Modbook

The clearest difference is update cadence: Modbook at every 9 days against BuildSpec's every 3 months. BuildSpec's advantage is iOS requirement (17.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BuildSpec ships an update every 3 months, Modbook every 9 days. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | BuildSpec | Modbook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/buildspec-car-builds/id6758304475/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 11 MB | 20 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 9+ | 4+ |
| Developer | [Grant Johnson](https://appshunter.io/developer/1866959368) | [Yaroslav Salimov](https://appshunter.io/developer/1837440620) |

## What reviewers say

### BuildSpec

[App page](https://appshunter.io/ios/app/buildspec-car-builds/id6758304475)

Easily track, organize, and showcase your car modification projects. Log parts, costs, and installation details for multiple vehicles in a structured, searchable garage. Designed for car builders and modifiers to maintain a complete build history.

**Highlights:** Track modifications and parts, Log costs and installation details, Maintain build history, Create multiple vehicle profiles, Store specifications and photos, Organized garage dashboard

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

**In-app purchases:** none


### Modbook

[App page](https://appshunter.io/ios/app/modbook-car-build-tracker/id6792492477)

**In-app purchases:** none


## Frequently asked questions

### Is BuildSpec free?

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

### Is Modbook free?

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

### Do BuildSpec or Modbook have ads?

Neither BuildSpec nor Modbook shows ads.

### Which is updated more often, BuildSpec or Modbook?

BuildSpec ships an update every 3 months, and Modbook every 9 days. Most recently, BuildSpec was updated on November 5, 2026 and Modbook on November 10, 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.*