# Stamp Mail vs Upstream

The clearest difference is rating: Stamp Mail at 5.0 against Upstream's 3.7. Upstream's advantage is in-app purchases (none vs 4). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Stamp Mail sells 4 in-app purchases, starting at $20.00 per month. Upstream asks for nothing beyond the download.

Stamp Mail holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 3 respectively.

Stamp Mail ships an update weekly, Upstream every 2 weeks. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Stamp Mail | Upstream |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/stamp-mail/id6748666316/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/upstream-email/id6751403722/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Freemium | **Free** |
| Size | 76 MB | 87 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stamp AI](https://appshunter.io/developer/1826931069) | [Upstream Labs](https://appshunter.io/developer/1834893204) |

## What reviewers say

### Stamp Mail

[App page](https://appshunter.io/ios/app/stamp-mail/id6748666316)

This AI-powered email client automates tasks like drafting replies, prioritizing messages, and extracting to-dos. It offers an agent to retrieve information and reorganize your inbox using plain English commands. A special mode allows quick review and approval of automated changes.

**Highlights:** Automated email drafting, Email prioritization, To-do extraction, Email summarization, Information retrieval via AI agent, Inbox reorganization, Approve/reject agent changes

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stamp Individual (Monthly) | $20.00 | per month |
| Stamp Business (Monthly) | $50.00 | per month |
| Stamp Individual (Annual) | $191.99 | per year |
| Stamp Business (Annual) | $479.99 | per year |


### Upstream

[App page](https://appshunter.io/ios/app/upstream-email/id6751403722)

This AI-powered inbox automatically organizes emails, drafts replies in your unique writing style, and sends follow-ups. It learns your workflow to minimize distractions and ensure no important messages are missed.

**Highlights:** AI email triaging, Personalized draft writing, Automated follow-ups, Self-organizing inbox, Learns user workflow

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

**In-app purchases:** none


## Frequently asked questions

### Is Stamp Mail free?

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

### Is Upstream free?

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

### Which has better reviews, Stamp Mail or Upstream?

Stamp Mail is rated higher. Stamp Mail averages 5.0 out of 5 from 3 ratings, while Upstream averages 3.7 from 3 ratings.

### Do Stamp Mail or Upstream have ads?

Neither Stamp Mail nor Upstream shows ads.

### Which is updated more often, Stamp Mail or Upstream?

Stamp Mail ships an update weekly, and Upstream every 2 weeks. Most recently, Stamp Mail was updated on October 15, 2026 and Upstream on October 2, 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.*