Sembly AI vs Sierra
Sembly AI vs Sierra, compared side by side on 18 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Sembly AI is on 46/100 and Sierra on 48/100.
Where each one leads
Sembly AI
Leads on none of the measures we hold for both companies.
Sierra
- agent readiness: 43/100 against 30/100
- headcount: 900 against 23
- funding raised: $680M against $10.0M
- LinkedIn following: 88,150 against 4,261
At a glance
| Measure | Sembly AI | Sierra |
|---|---|---|
| What it is | AI-powered meeting assistant that automates note-taking, summarization, and action item extraction. | Sierra builds AI agents that help leading brands deliver better customer experiences by increasing customer lifetime value and personalizing interactions across multiple channels. |
| Category | Conversational AI, Voice AI, AI Agent, Meeting Assistant | Conversational AI, AI Agent, Agentic AI, Customer Service Automation |
| Sells toBusiness model | B2B | B2B |
| Offering | Software | Platform |
| Founded | 2019 | 2023 |
| Headquarters | Tel Aviv, Israel | San Francisco, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Sembly AI | Sierra |
|---|---|---|
| Employees | 23 | 900 |
| Headcount growthLast 12 months | Not published | +137.5% |
| Total funding | $10.0M | $680M |
| Latest round | Seed | Not published |
| Valuation | Not published | $16B |
| LinkedIn followers | 4,261 | 88,150 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Sembly AI | Sierra |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 46/100 | 48/100 |
| Traction | 49/100 | 60/100 |
| Team | Not published | 70/100 |
| Search visibility | 26/100 | 32/100 |
| Quality | 58/100 | 40/100 |
| Agent readinessHow well an AI agent can read and act on the site | F (30/100) | D (43/100) |
| Domain ratingLink authority, 0-100 | 66/100 | 73/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Sembly AI | Sierra |
|---|---|---|
| Hosting | Not detected | Vercel |
| CDN | Cloudflare | Cloudflare |
| CMS | WordPress | Ghost |
| Frameworks | Not detected | Next.js, Tailwind CSS |
| Analytics | Google Tag Manager, Facebook Pixel | Not detected |
| Support stack | Not detected | HubSpot |
What users say
| Measure | Sembly AI | Sierra |
|---|---|---|
| Reddit sentimentThreads we track | Not published | 0 positive, 0 negative across 5 threads |
“Anyone use Decagon or Sierra AI?. Anyone have experience with CX tools like Sierra AI and Decagon? Reviews all over look great online but I’m curious what people actually think of them. Worth the hype?”r/CustomerSuccess
Sembly AI vs Sierra: common questions
Which is better, Sembly AI or Sierra?
On our 0-100 score Sierra rates higher (48/100 against 46/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 18 data points above: read the rows that match what you are buying for.
How do Sembly AI and Sierra compare on the numbers?
Sierra leads on agent readiness (43/100 against 30/100), headcount (900 against 23), funding raised ($680M against $10.0M), LinkedIn following (88,150 against 4,261).
What do real users say about Sembly AI and Sierra?
Sierra: 0 positive and 0 negative mentions across 5 Reddit threads we track, mostly in r/CustomerSuccess.
Read the full Sembly AI review and pricing or the Sierra review and pricing. You can also browse other Sembly AI alternatives we track.