TL;DR: If you are replacing FullSeam, the closest options are Operand, Plutis, Demospace. The table below compares 12 alternatives on what they do, stage, size and status.
Every alternative below is compared on what it actually does, not just its category — so you can see which one genuinely replaces FullSeam (YC Winter 2026).
Last verified:
The three closest alternatives to FullSeam are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Operand | — | YC Winter 2025 | 8 | Active |
| Plutis | — | YC Winter 2023 | 2 | Active |
| Demospace | — | YC Winter 2023 | 2 | Inactive |
| Hey Healthcare | — | YC Summer 2019 | 1 | Inactive |
| Holy Grail | — | YC Summer 2019 | 7 | Active |
| Scanate/Fellow | API for Invoice Financing | YC Summer 2016 | 2 | Inactive |
| PetaSales | — | YC Winter 2009 | 2 | Inactive |
| Snapboard | — | YC Winter 2020 | 2 | Inactive |
| Invo | infra for computer use agents | YC Winter 2025 | 1 | Active |
| Fithub | — | YC Winter 2010 | — | Inactive |
| Insoshi | — | YC Winter 2008 | — | Inactive |
| Thinkature | — | YC Summer 2006 | — | Inactive |
It depends on your size. Operand is the closest match on what FullSeam actually does. If you need something more established, sort the table by team size — larger teams generally mean more support and a longer track record. If budget is the constraint, the earlier-batch companies are usually the ones still competing on price.
FullSeam is still operating, so switching is a choice rather than a forced migration. Compare on fit and price rather than urgency.
Every company here is Y Combinator-backed and was matched to FullSeam on what it actually does — its own description of its product — rather than on a broad category label. Batch, team size and operating status come from the YC directory and are shown as-is. We do not rank by payment.
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