# Promethic vs ObsiKO

The clearest difference is update cadence: ObsiKO at every 6 days against Promethic's every 3 weeks. ObsiKO also leads on device support (4 vs 2). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Promethic against 5.0 for ObsiKO. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Promethic ships an update every 3 weeks, ObsiKO every 6 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Promethic | ObsiKO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/promethic/id6762032660/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/obsiko-ai-note-plus-mindmap/id6783405451/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Free | Free |
| Size | 31 MB | 79 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Soulware Studio LLC](https://appshunter.io/developer/1466437829) | [Hyojin Kim](https://appshunter.io/developer/6783405453) |

## What reviewers say

### Promethic

[App page](https://appshunter.io/ios/app/promethic/id6762032660)

This app transforms your AI prompts into reusable tools that learn from your revisions. It eliminates chat history and character limits, allowing prompts to evolve and improve over time. Import existing prompts or generate new ones based on your examples.

**Highlights:** Prompts as standalone tools, Persistent revision tracking, Saved model settings, Prompt import functionality, AI prompt generation, No character limits

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

**In-app purchases:** none


### ObsiKO

[App page](https://appshunter.io/ios/app/obsiko-ai-note-plus-mindmap/id6783405451)

This app integrates writing, knowledge management, and mind mapping with AI assistance. It supports various file formats and offers unique features for Korean language users, including a focus timer and GitHub syncing for secure data management.

**Highlights:** AI-assisted writing and mind mapping, Supports Obsidian vaults (.md, .canvas, .base), Korean dictionary and spell checker, Lock Screen focus timer, GitHub sharing and syncing, Automatic note connection and organization, Infinite mind-map canvas with Apple Pencil support

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

**In-app purchases:** none


## Frequently asked questions

### Is Promethic free?

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

### Is ObsiKO free?

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

### Which has better reviews, Promethic or ObsiKO?

Promethic and ObsiKO are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Promethic or ObsiKO have ads?

Neither Promethic nor ObsiKO shows ads.

### Which is updated more often, Promethic or ObsiKO?

Promethic ships an update every 3 weeks, and ObsiKO every 6 days. Most recently, Promethic was updated on October 31, 2026 and ObsiKO on November 5, 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.*