# Sinus ID vs KnowThySelf

The clearest difference is review sentiment: KnowThySelf at 100% against Sinus ID's 0%. KnowThySelf also leads on price (Free vs $4.99) and rating (5.0 vs 1.5). On ratings volume, ads, in-app purchases and device support there is nothing between them.

KnowThySelf is free to download; Sinus ID costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KnowThySelf holds the better App Store score, 5.0 against 1.5. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews point the same way: 0% of Sinus ID's written reviews are positive against 100% of KnowThySelf's.

Sinus ID ships an update every 40 months, KnowThySelf every 2 months. The most recent releases landed on October 7, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Sinus ID | KnowThySelf |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/sinus-id/id704828936/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/knowthyself-knowothers/id6474642480/reviews)** |
| Number of ratings | 2 | **5** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 47 MB | 10 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blue Tree Publishing, Inc.](https://appshunter.io/developer/496143325) | [Fleetsmart, LLC](https://appshunter.io/developer/1722172526) |

## What reviewers say

### Sinus ID

[App page](https://appshunter.io/ios/app/sinus-id/id704828936)

Explore detailed 3D models and animations of sinus anatomy. Identify structures, visualize fluid flow, and use the drawing tools to annotate and share your findings. Ideal for students, patients, and medical professionals.

**Highlights:** 3D sinus anatomy models, Interactive structure identification, Normal and abnormal fluid flow animations, Two-finger zoom and pan, Drawing whiteboard with text and eraser, Screenshot and share functionality

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

**In-app purchases:** none


### KnowThySelf

[App page](https://appshunter.io/ios/app/knowthyself-knowothers/id6474642480)

Build self-awareness and improve relationships with this app. It offers assessments to create a personal development profile including traits, values, skills, and goals. Share and discuss profiles with others for growth in various relationships.

**Highlights:** Personal development profile creation, Assessments for traits, values, skills, and goals, Profile sharing for relationship building, Fosters self-awareness, Supports healthy relationships, Customization options available

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sinus ID free?

Sinus ID costs $4.99, with no in-app purchases.

### Is KnowThySelf free?

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

### Which has better reviews, Sinus ID or KnowThySelf?

KnowThySelf is rated higher. Sinus ID averages 1.5 out of 5 from 2 ratings, while KnowThySelf averages 5.0 from 5 ratings.

### Do Sinus ID or KnowThySelf have ads?

Neither Sinus ID nor KnowThySelf shows ads.

### Which is updated more often, Sinus ID or KnowThySelf?

Sinus ID ships an update every 40 months, and KnowThySelf every 2 months. Most recently, Sinus ID was updated on October 7, 2026 and KnowThySelf on October 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.*