Upstream vs Slashy Mail
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Upstream
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.
- AI email triaging
- Personalized draft writing
- Automated follow-ups
- Self-organizing inbox
- Learns user workflow
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An AI inbox that triages itself, drafts in your voice, and follows up so you don’t have to remember to. ORGANIZE EMAILS YOUR WAY Upstream sorts, flags, and surfaces what needs your attention today. Noise gets filed away. No rules to set up or folders to maintain. It learns how you work and gets out of your way. DRAFTS IN YOUR VOICE. NOT A VOICE. Upstream writes like you. Not like AI pretending to be you. It studies how you write, how you talk to this specific person, and what the thread already sounds like, then drafts from there. The reply is waiting before you've finished reading the email. THE FOLLOW-UP WRITES ITSELF Upstream watches the threads going quiet, writes the nudge, and adds it to your inbox to send. The open loops close themselves. The ball never gets dropped.
Slashy Mail
A streamlined email client designed for Gmail users. It enables rapid inbox management, efficient searching, and quick replies. Features like reminders and scheduled sending help manage follow-ups effectively.
- Fast inbox triage
- Quick search
- Rapid replies
- Compose with attachments
- Reminders
- Scheduled send
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Slashy is a fast, focused email client for Gmail and Outlook. Quickly triage your inbox, search threads, reply fast, and compose with attachments. Use reminders and scheduled send to stay on top of follow-ups. Connect your Google or Microsoft account to access your existing mailbox and manage email efficiently from mobile.
Screenshots
Verdict
The clearest difference is rating: Slashy Mail at 4.8 against Upstream's 3.7. Slashy Mail also leads on review sentiment (80% vs 50%) and update cadence (every 3 days vs every 2 weeks). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Slashy Mail holds the better App Store score, 4.8 against 3.7. Both are backed by a comparable volume of ratings — 3 and 12 respectively. Written reviews point the same way: 50% of Upstream's written reviews are positive against 80% of Slashy Mail's.
Upstream ships an update every 2 weeks, Slashy Mail every 3 days. Both last shipped on October 24, 2026.
| Parameter | Upstream | Slashy Mail |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) | 4.8 (12 ratings) — better |
| Positive reviews | 50.0% of reviews | 80.0% of reviews — better |
| Number of ratings | 3 | 12 — better |
| Update frequency | Every 2 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 87 MB | 66 MB |
| Age rating | 4+ | 12+ |
| Developer | Upstream Labs | Dhruv Roongta |
Customer experience
Upstream
Slashy Mail
In-app purchases
Upstream
No in-app purchases
Slashy Mail
No in-app purchases
