Upstream
Upstream is a messaging app for teams, built on top of email.
Estimated origin: Dominican Republic
Added June 18, 2026
· Last analysed June 18, 2026 · via 
StackScope records what new websites are built with, the week they launch. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We crawled this one for its tech stack and scored it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 18 June 2026; the live site may have changed since.
Every technology below links to its own page: which other new sites launched with it. Vendors and agencies watch those pages with Stackdar and hear about new adopters the week they ship, from £15 a month.
Upstream has the basics covered well, with a thorough launch checklist, well-configured email security, and fast page loads. Worth fixing first: missing several security headers, incomplete legal pages, and tracking cookies set before any opt-in.
Launched on Product Hunt on June 18, 2026. The site is hosted on Amazon.com in the United States. Our crawler found 15 technologies on this site, covering analytics, business email, AI builders, and auth. The stack includes Google Sign-In, Apple App Store, and AWS Route 53.
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Tech Stack (15)
| DNS |
AWS Route 53
|
| Protocol | HTTP/3 |
| Security | HSTS |
| Business email |
Gandi
|
Google Workspace
(3)
|
| Auth |
Google Sign-In
|
| Font |
Google Fonts
|
| Mobile |
Apple App Store
(2)
|
| Analytics |
Google Analytics
(3)
|
Microsoft Clarity
|
|
PostHog
(3)
|
|
| Feedback |
Maze
(2)
|
| SEO |
Google Search Console
|
| Tag management |
Google Tag Manager
|
| AI builder |
Framer
(5)
|
Infrastructure
Email Security
Storage (9)
| Name | Lifetime | Detected as |
|---|---|---|
| ph_phc_cMDZI5xhz67NyyeIdDmGX0jE6aY1adPbOebBzffnXYW_posthog | 1y | PostHog |
| _ga | 1y | Google Analytics |
| _ga_8DFDL8LPFZ | 1y | Google Analytics |
| Key | Size | Detected as |
|---|---|---|
| ph_phc_cMDZI5xhz67NyyeIdDmGX0jE6aY1adPbOebBzffnXYW_posthog | 1.5 KB | PostHog |
| Key | Size | Detected as |
|---|---|---|
| maze-us | 13 B | Maze |
| maze:widgets | 38 B | Maze |
| ph_phc_cMDZI5xhz67NyyeIdDmGX0jE6aY1adPbOebBzffnXYW_posthog | 330 B | PostHog |
| ph_phc_cMDZI5xhz67NyyeIdDmGX0jE6aY1adPbOebBzffnXYW_primary_window_exists | 4 B | PostHog |
| ph_phc_cMDZI5xhz67NyyeIdDmGX0jE6aY1adPbOebBzffnXYW_window_id | 38 B | PostHog |
Readiness Breakdown How?
Performance How?
⚠ 139 images: 39 oversized, 13 without width/height, 132 missing alt text
Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.
Vibe Score Breakdown How?
| Signal | Points |
|---|---|
| AI copy signals | +5 |
| AI writing signals | +3 |
| AI iconography signals | +3 |
| Round-number metric claim | +5 |
| AI styling signals | +10 |
| AI layout signals | +5 |
This score is based on structural patterns and is not definitive. Many legitimate sites may trigger signals, and AI-built sites may go undetected. It should be treated as an indicator, not a verdict.