Langfuse vs Rely.io
Langfuse vs Rely.io, compared side by side on 10 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: Langfuse is on 55/100 and Rely.io on Not scored yet.
Where each one leads
Langfuse
- agent readiness: 43/100 against 22/100
- domain rating: 79/100 against 28/100
Rely.io
Leads on none of the measures we hold for both companies.
At a glance
| Measure | Langfuse | Rely.io |
|---|---|---|
| What it is | Open-source LLM engineering platform for debugging, monitoring, and improving production-grade LLM applications. | AI-powered monitoring platform for IT operations. |
| Category | MLOps, Observability, Developer Tools, API Platform | MLOps, Observability, AI Infrastructure, IT Operations |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Software |
| Founded | 2022 | 2020 |
| Headquarters | Berlin, Germany | Lisbon, Portugal |
| Status | Active | Active |
Size, funding and growth
| Measure | Langfuse | Rely.io |
|---|---|---|
| Employees | 21 | Not published |
| Headcount growthLast 12 months | +81.0% | Not published |
| Total funding | $2.5M | Not published |
| Latest round | Seed | Not published |
| LinkedIn followers | 13,143 | Not published |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Langfuse | Rely.io |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 55/100 | Not published |
| Traction | 45/100 | Not published |
| Team | 70/100 | Not published |
| Search visibility | 58/100 | Not published |
| Quality | 58/100 | Not published |
| Agent readinessHow well an AI agent can read and act on the site | D (43/100) | F (22/100) |
| Domain ratingLink authority, 0-100 | 79/100 | 28/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Langfuse | Rely.io |
|---|---|---|
| Hosting | Vercel | Not detected |
| CDN | Vercel | Not detected |
| Frameworks | Next.js, Tailwind CSS | Not detected |
| Analytics | Google Analytics 4, Google Tag Manager, Segment | Not detected |
| Support stack | HubSpot | Not detected |
| Open source | Yes | No |
Product and pricing
| Measure | Langfuse | Rely.io |
|---|---|---|
| Key features | Full Context Tracing, Cost & Latency Monitoring, Output Quality Evaluation, Prompt Management & Experimentation, Testing & Benchmarking | Not published |
Langfuse vs Rely.io: common questions
Which is better, Langfuse or Rely.io?
On our 0-100 score Langfuse rates higher (55/100 against Not scored yet). 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 10 data points above: read the rows that match what you are buying for.
How do Langfuse and Rely.io compare on the numbers?
Langfuse leads on agent readiness (43/100 against 22/100), domain rating (79/100 against 28/100).
Read the full Langfuse review and pricing or the Rely.io review and pricing. You can also browse other Langfuse alternatives we track.