# LSDF e vs IODA Optimist

LSDF e and IODA Optimist are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

LSDF e ships an update monthly, IODA Optimist every 2 months. The most recent releases landed on September 15, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | LSDF e | IODA Optimist |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Size | 10 MB | 67 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sergejs Litvinovskis](https://appshunter.io/developer/1581970645) | [Sailti](https://appshunter.io/developer/960712124) |

## What reviewers say

### LSDF e

[App page](https://appshunter.io/ios/app/lsdf-e-karte/id1581970643)

**Features:** macOS Compatibility

**In-app purchases:** none


### IODA Optimist

[App page](https://appshunter.io/ios/app/ioda-optimist/id6504682148)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LSDF e free?

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

### Is IODA Optimist free?

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

### Do LSDF e or IODA Optimist have ads?

Neither LSDF e nor IODA Optimist shows ads.

### Which is updated more often, LSDF e or IODA Optimist?

LSDF e ships an update monthly, and IODA Optimist every 2 months. Most recently, LSDF e was updated on September 15, 2026 and IODA Optimist on September 18, 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.*