Castled.io alternatives
TL;DR: 12 companies doing similar work to Castled.io in B2B, ranked by how closely they match what Castled.io actually does — not just by category.
How this list was built: every company here is Y Combinator-backed and shares at least one category with Castled.io. They are scored on how closely their own description overlaps with Castled.io's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Castled.io?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| PetaSales | — | Winter 2009 | 2 | Inactive |
| AdThrow | — | Summer 2009 | — | Inactive |
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Optilly/Installmonetizer | Fb ad optimization platform | Winter 2012 | 11 | Inactive |
| Locent | Locent is an automated messaging platform for companies | Summer 2015 | 11 | Inactive |
| Avalanche | Referral program SDK for startups | Winter 2019 | 1 | Inactive |
| BackType | BackType was an analytics company acquired by Twitter in 2011 | Summer 2008 | — | Acquired |
| TapEngage | Touch-friendly marketing, acquired by Dropbox | Summer 2011 | 2 | Acquired |
| Hightouch | The leading Composable CDP and AI Decisioning platform | Summer 2019 | 200 | Active |
| ShopWith | ShopWith is mobile QVC for GenZ. | Summer 2018 | 3 | Inactive |
| GiveSpark | Givespark was a celebrity charity fundraising platform | Winter 2012 | 1 | Inactive |
Is Castled.io still active?
Castled.io is no longer listed as active, so anyone still relying on it should plan a migration to one of the alternatives above.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Castled.io. They are then ranked on how closely their own description overlaps with Castled.io's, so the closest matches come first rather than whoever happens to share a tag.