ROLE
AI SDK / gateway
Library or router between your code and the models.
89
81–97 · low confidence
One key and bill for many models; good for trying several.
Use when the feature is really an agent with state.
STACKFOR
StackFor adding AI features to an existing app
Provisional seed stack, low confidence, not hands-on tested. Affiliate status was not an input.
The app already exists. You need a model API, a place to trace calls, and an editor that can work in the current repo.
BuilderIntermediateProvisional scores
STACK SCORE
89
Mean of the role winners, compatibility +4. Separate from each tool score.
Provisional seed scores. Method seed-v0-provisional, confidence low, not hands-on tested. The band around a number is a ±8 display label, not a measured interval. Ordering uses the point estimate.
We may earn a commission if a tracking link is connected and you buy through it. It never changes ranks. In this v1 seed, tracking URLs are empty, so “Open site” goes to the vendor. Sponsorship rules.
Recommended stack
Add model calls to an app you already run: an SDK, a model, retrieval, and tracing.
Example compatibility note, not a measured integration test. AI SDK speaks to OpenAI, Anthropic, Gemini, and OpenRouter with one interface.
ROLE
LLM API
The model call inside the product.
83
75–91 · low confidence
Widest SDK and tooling coverage.
Long context and a useful free tier.
ROLE
Observability
Traces and evals.
82
74–90 · low confidence
Evals-first; strong when quality regressions matter.
Best inside the LangChain ecosystem.
Ranked tools
Sorted by StackFor Score only. A tool can appear twice when it fills two roles. Affiliate programs are not on this list.
- #1AI SDK
AI SDK / gateway · role rank 1
89
81–97 · low confidence
Open-source TypeScript SDK with streaming UI and tool calls.
Goal fit25%92Output quality20%86Ease for vibe coders15%84Pricing and free tier15%98Integrations and API10%88Momentum10%90Community sentiment5%82No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open AI SDK - #2
85
77–93 · low confidence
pgvector next to the app's own tables.
Goal fit25%86Output quality20%84Ease for vibe coders15%86Pricing and free tier15%82Integrations and API10%90Momentum10%86Community sentiment5%84No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open Supabase - #3OpenRouter
AI SDK / gateway · role rank 2
84
76–92 · low confidence
One key and bill for many models; good for trying several.
Goal fit25%84Output quality20%82Ease for vibe coders15%90Pricing and free tier15%80Integrations and API10%84Momentum10%86Community sentiment5%76No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open OpenRouter - #4
83
75–91 · low confidence
Strong at reasoning and tool use inside product features.
Goal fit25%90Output quality20%90Ease for vibe coders15%74Pricing and free tier15%66Integrations and API10%86Momentum10%88Community sentiment5%82No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open Anthropic API - #5
83
75–91 · low confidence
Widest SDK and tooling coverage.
Goal fit25%90Output quality20%88Ease for vibe coders15%76Pricing and free tier15%64Integrations and API10%94Momentum10%86Community sentiment5%74No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open OpenAI API - #6
82
74–90 · low confidence
Long context and a useful free tier.
Goal fit25%86Output quality20%84Ease for vibe coders15%76Pricing and free tier15%78Integrations and API10%84Momentum10%82Community sentiment5%72No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open Gemini API - #7
82
74–90 · low confidence
Open-source tracing and prompt management.
Goal fit25%88Output quality20%80Ease for vibe coders15%74Pricing and free tier15%90Integrations and API10%76Momentum10%82Community sentiment5%78No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open Langfuse - #8Braintrust
Observability · role rank 2
81
73–89 · low confidence
Evals-first; strong when quality regressions matter.
Goal fit25%84Output quality20%88Ease for vibe coders15%80Pricing and free tier15%62Integrations and API10%84Momentum10%86Community sentiment5%80No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open Braintrust - #9Pinecone
Vector store · role rank 2
80
72–88 · low confidence
Managed vector index when you outgrow Postgres.
Goal fit25%82Output quality20%86Ease for vibe coders15%82Pricing and free tier15%70Integrations and API10%88Momentum10%72Community sentiment5%76No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open Pinecone - #10
79
71–87 · low confidence
Use when the feature is really an agent with state.
Goal fit25%74Output quality20%88Ease for vibe coders15%62Pricing and free tier15%90Integrations and API10%80Momentum10%84Community sentiment5%76No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open LangGraph - #11
76
68–84 · low confidence
Best inside the LangChain ecosystem.
Goal fit25%80Output quality20%84Ease for vibe coders15%70Pricing and free tier15%64Integrations and API10%78Momentum10%76Community sentiment5%74No cited evidence stored. seed-v0-provisional. Not hands-on tested.
Open LangSmith
Draft feature checklist
Goal fit is scored against these must-haves. The list is a draft rubric, not a test log.
AI SDK / gateway
- Streaming
- Tool calls
- Swap providers
LLM API
- Documented API
- Spend caps
Vector store
- Embeddings near your data
Observability
- Traces
- Cost per request
Questions
Are these scores from hands-on tests?
No. Every score on this page is a provisional seed estimate with low confidence. The band around the number is a display convention, not a measured interval.
Can a paid listing change who is recommended?
No. Affiliate programs and sponsored cards are not inputs. A sponsored card, when one exists, is labeled and sits outside the ranking.
NEWSLETTER
The weekly AI stack drop
New tools worth your time, by use case. One email a week. A sponsor, when there is one, is labeled.