Upstream vs Slashwork
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.
Slashwork
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Slashwork is rebuilding workplace communication around clarity, context, and human connection. Stay aligned without drowning in noise. Work with focus, confidence, and intent. Even with the best tools on the market today, we live with a constant sense of FOMO. If you miss a key conversation, it's lost to scrollback eternity. If you accidentally mark a notification as read... *poof*. Good luck ever finding that question you needed to answer again. This creates an always-on burden of comms housekeeping: clicking through endless channels, scrolling back hoping not to miss anything. This tax is paid most dearly by the most valuable people in an organization because they do the most communicating. We wanted a different tool -- one that brings you all of the key updates and that makes discovering what's going on in your company joyful and effortless. Calm rather than frenetic. Knowledge-preserving rather than lossy. Instantly-catch-up-able rather than always-on-blink-and-you-missed-it. That's what Slashwork delivers.
Screenshots
Verdict
The clearest difference is update cadence: Upstream at every 2 weeks against Slashwork's every 2 months. On price, ads, in-app purchases and device support 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.
Upstream ships an update every 2 weeks, Slashwork every 2 months. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.
| Parameter | Upstream | Slashwork |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 87 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Upstream Labs | Anserine Labs |
In-app purchases
Upstream
No in-app purchases
Slashwork
No in-app purchases









