Vellum alternative

AIgateway: the best Vellum alternative in 2026

The best Vellum alternative in 2026 is AIgateway. Vellum is a visual prompt + workflow builder aimed at product teams; AIgateway is a developer-first inference gateway — OpenAI-compatible, 100+ models, every modality, sub-accounts, evals, replay — with no vendor-specific workflow DSL.

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Feature comparison

AIgateway vs Vellum

Side-by-side on the dimensions that move a production decision.

Feature

AIgateway

Vellum

Visual workflow builder

No — code-first

Yes

OpenAI SDK compat

Yes

Proprietary SDK primary

Modality coverage

Every modality

Text + some image

Seat fees

None

Yes

Sub-account API

Yes

Limited

Edge latency

47ms p50

Regional

Feature comparison reflects public documentation as of 2026. Vellum pricing shape: Seat-based SaaS.. Catalog: Proxies upstream providers for execution..

Migrate in 5 minutes

Three steps. One base URL.

If you're on Vellum through the OpenAI SDK, you're 90% of the way there. Change the base URL and the key.

STEP 01

Sign up for AIgateway

Create an account at aigateway.sh/signin and copy an sk-aig-... key from the dashboard.

STEP 02

Swap base URL + key

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

STEP 03

Ship

Request shape, response shape, streaming SSE — identical to OpenAI. Model slugs map 1:1 on shared providers. Vellum users typically migrate in under 5 minutes.

4 other alternatives

Other Vellum alternatives worth checking

Honest take: here are four other credible options. None ship the full multi-modal catalog + sub-accounts + evals under one key, but each has a legit wedge.

#2 — LLM router