# IsI Tanktagebuch vs SpoolManager

The clearest difference is in-app purchases: IsI Tanktagebuch at none against SpoolManager's 3. IsI Tanktagebuch also leads on iOS requirement (16.4 vs 18.0). SpoolManager's advantage is update cadence (fortnightly vs every 39 months). On price, ads and device support there is nothing between them.

Both are free to download. SpoolManager sells 3 in-app purchases, starting at $0.99 per month. IsI Tanktagebuch asks for nothing beyond the download.

IsI Tanktagebuch ships an update every 39 months, SpoolManager fortnightly. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | IsI Tanktagebuch | SpoolManager |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 39 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 1 MB | 23 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Dominic Barra](https://appshunter.io/developer/891093115) | [Norman Hennige](https://appshunter.io/developer/1893635442) |

## What reviewers say

### IsI Tanktagebuch

[App page](https://appshunter.io/ios/app/isi-tanktagebuch/id1500291798)

Track and optimize your vehicle's fuel efficiency by logging every refueling. Analyze your consumption in liters per 100 kilometers and monitor fuel costs. This app offers an intuitive interface for easy data entry and management, helping you save money and drive more sustainably.

**Highlights:** Log fuel purchases, Track fuel consumption, Analyze fuel efficiency, Monitor fuel costs, Intuitive interface, Delete individual entries

**In-app purchases:** none


### SpoolManager

[App page](https://appshunter.io/ios/app/spoolmanager/id6762280426)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monatsabo | $0.99 | per month |
| Jahresabo | $8.99 | per year |
| Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is IsI Tanktagebuch free?

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

### Is SpoolManager free?

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

### Do IsI Tanktagebuch or SpoolManager have ads?

Neither IsI Tanktagebuch nor SpoolManager shows ads.

### Which is updated more often, IsI Tanktagebuch or SpoolManager?

IsI Tanktagebuch ships an update every 39 months, and SpoolManager fortnightly. Most recently, IsI Tanktagebuch was updated on October 21, 2026 and SpoolManager 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.*