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.
Website proof walls for founders & brands
Turn testimonials, reviews and social posts into website proof walls.
Castio lets you collect testimonials, reviews, social posts, screenshots and UGC, curate the best proof, style it on-brand and embed it anywhere on your website.
- No credit card
- No account connections required
- Live in 5 minutes
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.
Featured in The Stack Weekly
“One of the cleanest ways we've seen to turn testimonials into conversions.”
Sam Reyes
Co-founder · Northwind Labs
Day 60: 1,200 signups, 38 paying teams, and a proof wall that does the selling for us.
Try it free
Powered by Castio
5
proof source types
4 steps
collect → embed
1 line
embed code
Any page
homepage · product · pricing
How Castio works
From scattered proof to an embedded wall in four steps
No code, no social logins, no waiting on a platform. You stay in control of every card.
01
Collect proof
Add testimonials, reviews, social posts, screenshots, UGC, launch proof and founder updates.
02
Curate what matters
Approve the best items, organise them by wall, and remove weak or irrelevant proof.
03
Style your proof wall
Choose layout, theme, accent, spacing, branding and CTA settings.
04
Embed anywhere
Publish the wall on your homepage, product page, pricing page, landing page or launch page.
Proof sources
Turn proof from anywhere into a wall
Connect an RSS or YouTube feed, or add testimonials, reviews, social posts, screenshots and UGC by hand. Curate the best before publishing.
TestimonialsReviewsInstagramTikTokLinkedInX / TwitterYouTubeFacebookRedditGoogle ReviewsG2TrustpilotScreenshotsCustomer emailsUGCFounder updates
Add, paste or connect proof — then approve the best before it goes live. See all sources & statuses →
Built for the people who live and die by social proof
SaaS foundersEcommerce brandsAgenciesCourse creatorsCoaches & consultantsApp launchesProduct pagesPricing pages
The problem
Your proof is scattered. That costs you sales.
Your best proof is usually buried in screenshots, reviews, emails, social posts and launch updates. Castio turns those scattered assets into one polished proof wall visitors can actually see.
Before — scattered
- Testimonials buried in your inbox
- Screenshots sitting in folders
- Social praise lost in feeds
- Reviews split across platforms
After — one Castio wall
- One curated proof wall
- Styled to match your brand
- Embedded on high-intent pages
- Updated without a developer ticket
Conversion assets, not a feed widget
Social feed widgets show content. Castio turns proof into conversion assets.
Curator-style tools mirror a raw feed and call it done. Castio is built for curation and conversion.
- Not just posts — proof cards, testimonials, reviews, metrics, screenshots and launch updates together
- Not just a feed — curated by intent, so only your strongest proof shows
- Embedded where buyers decide — homepage, product pages and pricing pages
Liam Crawford
Cohort 4
I went from zero audience to my first 10k followers using exactly this framework. Worth 10x the price.
Dana Whitfield
Watch Dana's results
Two-minute walkthrough of how the system changed my content workflow.
Watch video@noor.creates
Three weeks in and I've already booked two brand deals. This actually works.
Marcus Bell
Cohort 3
The accountability alone was worth it. I finally shipped consistently.
Try it free
Powered by Castio
News and stories
Guides on proof, curation and conversion
Guide
How to turn testimonials into a website proof wall
Collect, curate and embed your best testimonials where they lift conversions.
Read →ComparisonSocial proof wall vs social feed widget
Why a curated proof wall converts better than a raw, auto-updating feed.
Read →PlaybookCurator.io alternative: proof walls built for conversion
Move from mirroring a social feed to curating proof that helps visitors buy.
Read →FAQ
Questions, answered
Do I need to connect Instagram, TikTok or X?+
No. You add or paste proof yourself from the places your customers already speak, so you're never blocked waiting on a platform integration or approval.
How is this different from a social feed widget?+
A feed widget mirrors 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 homepage, product pages, pricing pages, landing pages, store 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.
Start free today
Turn your proof into a conversion asset
Build a curated proof wall and embed it anywhere. Free to start — no social logins, live in five minutes.
- No credit card
- No account connections required
- Live in 5 minutes
13
proof types
2
layouts live
1 line
to embed
5 min
to publish