# Taxbooks vs SLD System

The clearest difference is update cadence: SLD System at every 3 weeks against Taxbooks's every 7 months. Taxbooks's advantage is iOS requirement (9.3 vs 12.0). 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.

Taxbooks ships an update every 7 months, SLD System every 3 weeks. The most recent releases landed on October 4, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Taxbooks | SLD System |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Size | 3 MB | 31 MB |
| Requires iOS | **9.3** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Drumlin](https://appshunter.io/developer/512187924) | [Manage](https://appshunter.io/developer/1601418123) |

## What reviewers say

### Taxbooks

[App page](https://appshunter.io/ios/app/taxbooks/id512187921)

**In-app purchases:** none


### SLD System

[App page](https://appshunter.io/ios/app/sld-system/id6741755009)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Taxbooks free?

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

### Is SLD System free?

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

### Do Taxbooks or SLD System have ads?

Neither Taxbooks nor SLD System shows ads.

### Which is updated more often, Taxbooks or SLD System?

Taxbooks ships an update every 7 months, and SLD System every 3 weeks. Most recently, Taxbooks was updated on October 4, 2026 and SLD System on October 25, 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.*