Maya Patel
Head of Ops · Northwind Labs
We replaced three tools with this in a week. Onboarding was the smoothest I've seen in years.
Social proof, done properly
Turn scattered proof into walls that convert.
Castio turns testimonials, reviews, social posts, screenshots and UGC into clean, embeddable proof walls for your website, store or launch page.
Collect proof. Curate it. Display it. Convert with it.
No credit card · No social logins · Live in 5 minutes
Live preview · SaaS Launch Wall
Internal dashboard
Activation up 34%
New-user activation jumped 34% in the first month after switching.
Dev Okonkwo
@devbuilds
Okay this just became my favorite launch of the quarter. Clean, fast, does exactly what it says.
Tara Lindqvist
Founder · Cadence
★★★★★ Worth every minute saved
Set up our first proof wall in under five minutes and embedded it on our pricing page same day.
Try it free
Powered by Castio
How it works
Four steps from raw proof to conversions
Castio keeps the whole loop in one place — no spreadsheets, no screenshots folder, no widget graveyard.
1
Collect
Add testimonials, reviews, social posts, screenshots and UGC by hand or by pasting a link. No integrations to wait on.
2
Curate
Approve, hide or archive each card. Only the proof you approve ever goes live.
3
Display
Pick a layout, theme and accent. Your wall looks designed — not like a bolt-on widget.
4
Convert
Embed it on any page with one iframe snippet and add a CTA that turns proof into clicks.
Not a feed widget
A conversion asset — not a social feed
Curator-style tools mirror a raw social feed and call it done. Castio is built for curation and conversion: you choose every card, shape the design, and add the call to action.
Feed aggregators
Mirror everything, no curation
Castio
Approve only your best proof
Feed aggregators
Generic widget styling
Castio
On-brand, conversion-first walls
Every kind of proof
13 proof types, one clean wall
Mix and match whatever convinces your buyer.
TestimonialReviewSocial postVideoScreenshotPress mentionMetricCustomer quoteFounder updateCase studyUGCBefore / afterLaunch proof
Why Castio
Premium, lightweight, fast to understand
Manual-first, instant
Build a real proof wall in five minutes. No OAuth, no approvals, no scraping.
Curation built in
Draft → approve → publish. You decide exactly what the public sees.
Designed to convert
Accent colors, radius, spacing and CTAs — proof that matches your brand.
Embed anywhere
One iframe works on any site, store, landing page or builder.
Light & dark walls
Walls inherit a theme so they look native wherever you drop them.
Analytics-ready
Track wall views, card clicks and CTA clicks so you know what proof performs.
FAQ
Questions, answered
Do I need to connect Instagram, TikTok or X?+
No. Castio is manual-first. You add or paste proof yourself, so you are never blocked waiting on a platform integration or approval.
How is this different from a social feed aggregator?+
Aggregators mirror a raw social feed. Castio turns individual testimonials, reviews, screenshots and UGC into a curated, conversion-focused proof wall you control.
Where can I embed a wall?+
Anywhere that accepts an iframe — your website, store, landing page, course platform or no-code builder.
Can I remove Castio branding?+
Yes, on paid and higher lifetime tiers. The free tier shows a small ‘Powered by Castio’ link.
Your proof is already working. Put it to work harder.
Build your first proof wall free and embed it today.