# Superhuman Mail vs knowb4usign

The clearest difference is in-app purchases: knowb4usign at none against Superhuman Mail's 1. knowb4usign also leads on rating (5.0 vs 4.6) and iOS requirement (15.1 vs 26.0). Superhuman Mail's advantage is ratings volume (3.7K vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Superhuman Mail sells 1 in-app purchase, starting at $29.99 per month. knowb4usign asks for nothing beyond the download.

knowb4usign holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Superhuman Mail has 3.7K ratings behind it against 1, so its average is the more settled of the two.

Superhuman Mail ships an update weekly, knowb4usign every 2 weeks. The most recent releases landed on September 25, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Superhuman Mail | knowb4usign |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (3.7K ratings)](https://appshunter.io/ios/app/superhuman-mail/id1120837655/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/knowb4usign/id6779456576/reviews)** |
| Number of ratings | **3.7K** | 1 |
| Positive reviews | 41.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 107 MB | 23 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Superhuman Labs](https://appshunter.io/developer/1120837654) | [Pexora LLC](https://appshunter.io/developer/6779456578) |

## What reviewers say

### Superhuman Mail

[App page](https://appshunter.io/ios/app/superhuman-mail/id1120837655)

This email application streamlines inbox management with AI-powered drafting and summarization. It helps users prioritize important messages, schedule emails for optimal delivery, and collaborate with teams through shared email views and integrated CRM tools. Save time and improve responsiveness with advanced features.

**Highlights:** AI email drafting, Automatic email summarization, Customizable inbox triage, Scheduled email delivery, Email sharing and commenting, Calendar integration, CRM integrations (HubSpot, Salesforce)

**Features:** Apple Wallet, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $29.99 | per month |

**What reviewers like**

- 🚀 Fast and efficient
- 👍 Great user experience
- 🔒 Robust security features
- 💡 Innovative AI-powered features
- 🕰 Time-saving productivity tools

**What reviewers complain about**

- 💰 Expensive subscription
- 🐛 Bugs and crashes
- 🔋 High battery consumption
- 📱 Lacking mobile app features
- 🤔 Confusing onboarding process

**Reported bugs**

- Login issues and account activation problems
- Emails not loading or syncing properly
- Formatting issues in email threads
- Crashes and freezes on various devices

**Requested features**

- Unified inbox for multiple accounts
- Better calendar integration
- More customization options
- Improved mobile app experience
- Table support in email composition


### knowb4usign

[App page](https://appshunter.io/ios/app/knowb4usign/id6779456576)

This app provides plain-English summaries of legal documents like contracts, leases, and terms of service. It breaks down complex clauses, highlights your obligations and rights, and assigns a risk score for quick understanding. Upload or scan documents for an instant AI review.

**Highlights:** Plain-English contract summaries, Clause-by-clause breakdown, Identification of obligations and rights, Risk assessment score, Document upload and camera scanning, AI-powered review, Follow-up question chat

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Superhuman Mail free?

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

### Is knowb4usign free?

knowb4usign is free to download, with no in-app purchases.

### Which has better reviews, Superhuman Mail or knowb4usign?

knowb4usign is rated higher. Superhuman Mail averages 4.6 out of 5 from 3.7K ratings, while knowb4usign averages 5.0 from 1 ratings.

### Do Superhuman Mail or knowb4usign have ads?

Neither Superhuman Mail nor knowb4usign shows ads.

### Which is updated more often, Superhuman Mail or knowb4usign?

Superhuman Mail ships an update weekly, and knowb4usign every 2 weeks. Most recently, Superhuman Mail was updated on September 25, 2026 and knowb4usign on September 13, 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.*