Startupsby GlyphWhy it ranks
How the rank works- went through YCProgram · this site+4
- team of 3Team size · YC's directory+3.1
A sum of public facts, not a judgement and not investment advice.
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
| AI, Devtools | Inactive | YCW20 |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
| Devtools | Active | YCW23 | |
| Other | Not stated | speedrunSR001 | |
| Devtools | Inactive | YCS14 | |
| Other | Active | YCW15 | |
| Other | Acquired | YCS18 |
Also from X26 in AI
All of X26Founders
- Jynnie TangFounder/CEO
- Manuel CastroFounder
- Claire NordFounder/CTO
About Paper Star
For companies that want to 10x, Echo agents learn the work, do it end to end, and scale it
- YC batch
- X26 · Spring 2026
- Status, per YC
- Active
- Category
- AI
- Team size
- 3
- Location
- San Francisco, CA, USA
- Founded
- 2026
- Checked
- 9h ago
YC tags: AI
Changes seen
Moved its website from paperstar.cc to echoecho.ai.
Website link changed from https://paperstar.cc to https://echoecho.ai/.
Rewrote its one-liner; it read "Building the next generation of agents"
Renamed from Napkin Math.
Moved its website from napkinmath.club to paperstar.cc.
Former name added: Napkin Math.
Website link changed from https://napkinmath.club to https://paperstar.cc.
Rewrote its one-liner; it read "AI nutrition coach in your pocket"
Industry changed from Consumer to B2B.
Subindustry changed from Consumer to B2B.
Newly tagged AI.
Paper Star: questions
Which YC batch was Paper Star in?
Paper Star was in Y Combinator's Spring 2026 batch (X26).
Is Paper Star still active?
Y Combinator lists Paper Star as active.
Who founded Paper Star?
Paper Star's founders, as listed on its YC page: Jynnie Tang (Founder/CEO), Manuel Castro (Founder), Claire Nord (Founder/CTO).
Where is Paper Star based?
Paper Star lists San Francisco, CA, USA as its location on YC's directory.