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Rank #1 of 8 in Design & Prototyping

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Try itExperimental

See what an agent can do with Spline before you ever sign up. Pick a story: recorded sessions replay real probe-harness transcripts; commands tagged live-capable can re-run against the real endpoint from our edge, right now (▶ run live — the exact same request, live and recorded lines always labeled); sandboxed self-drive sessions are designed and gated (docs/TRY-IT.md).

$curl -sL https://docs.spline.design/llms.txt | head -3recorded session — replayed, not live
recorded 2026-09-14 · exit 0 · captured verbatim by our probe harness, secrets redacted · pure-HTTP probe — ▶ run live re-runs it from our edge

Verified integrations

Connections to other tracked products — hover a chip for the verbatim evidence quote behind it.

By theme — the product's score on each story themeBy theme

Agent design — stories about agent design in this arenaAgent designevidence →

Stories about agent design in this arena

45.1/100

Agenticness — how well agents can access and operate the productAgenticnessevidence →

How well agents can access and operate the product

36.8/100

Ai design — stories about ai design in this arenaAi designevidence →

Stories about ai design in this arena

52.7/100

Automation depth — how much of the product can run unattendedAutomation depthevidence →

How much of the product can run unattended

40.0/100

Collaboration multiplayer — stories about collaboration multiplayer in this arenaCollaboration multiplayerevidence →

Stories about collaboration multiplayer in this arena

57.6/100

Components design systems — stories about components design systems in this arenaComponents design systemsevidence →

Stories about components design systems in this arena

17.1/100

Dev handoff — stories about dev handoff in this arenaDev handoffevidence →

Stories about dev handoff in this arena

28.0/100

Openness — open source, data portability, and self-hosting storiesOpennessevidence →

Open source, data portability, and self-hosting stories

27.0/100

Plugins extensibility — stories about plugins extensibility in this arenaPlugins extensibilityevidence →

Stories about plugins extensibility in this arena

0.0/100

Pricing plans — plan structure and value — what each tier costs and what it unlocksPricing plansevidence →

Plan structure and value — what each tier costs and what it unlocks

16.0/100

Privacy posture — data-handling and privacy storiesPrivacy postureevidence →

Data-handling and privacy stories

0.0/100

Prototyping — stories about prototyping in this arenaPrototypingevidence →

Stories about prototyping in this arena

50.7/100

Vector editing — stories about vector editing in this arenaVector editingevidence →

Stories about vector editing in this arena

18.0/100

Versioning export — stories about versioning export in this arenaVersioning exportevidence →

Stories about versioning export in this arena

14.6/100

Story verdicts — every judged story with its evidenceStory verdicts

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Sorted by importance (agentic first) (high → low) · 53/53 stories · click a row’s chevron for the rationale and evidence

Connect an agent via an official MCP server G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness3full8/10T

Delegate tasks to a built-in AI assistant inside the product G

Agentic features

ai-native userAgenticness — how well agents can access and operate the productAgenticness3full7/10C

Drive the product through a documented public API G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness3partial7/10T

Plug MCP servers into this product so it can use their tools G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness3none0/10

Point an agent at llms.txt or agent-oriented docs G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness2full9/10T

Operate the product with natural-language commands G

Agentic features

ai-native userAgenticness — how well agents can access and operate the productAgenticness2full8/10C

Subscribe to events via webhooks G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness2full7/10C

Build against official SDKs G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness2partial6/10T

Set up automations that run autonomously in the background G

Agentic features

ai-native userAgenticness — how well agents can access and operate the productAgenticness2partial4/10C

Download a machine-readable API spec (OpenAPI or equivalent) G

Api quality

ai-native userAgenticness — how well agents can access and operate the productAgenticness2none0/10

Explore an interactive API reference with runnable examples G

Api quality

ai-native userAgenticness — how well agents can access and operate the productAgenticness2none0/10

Issue scoped/least-privilege API credentials for an agent G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness2none0/10

Rely on versioned APIs with a documented deprecation policy G

Api quality

ai-native userAgenticness — how well agents can access and operate the productAgenticness2none0/10

Run the product headlessly / in CI for automation G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness2none0/10

Get AI-generated insights and suggestions from my data inside the product G

Agentic features

ai-native userAgenticness — how well agents can access and operate the productAgenticness2n/auntestednone yet

Use an official CLI G

Agent access

ai-native userAgenticness — how well agents can access and operate the productAgenticness2n/auntestednone yet

Test against a sandbox environment without touching production data G

Api quality

ai-native userAgenticness — how well agents can access and operate the productAgenticness1n/auntestednone yet

My whole team can edit the same file simultaneously with live cursors and instant sync C

Collaboration

designerCollaboration multiplayer — stories about collaboration multiplayer in this arenaCollaboration multiplayer3full8/10C

Define rules that trigger actions automatically on events G

ai-native userAutomation depth — how much of the product can run unattendedAutomation depth3full7/10C

Export all of my data in open formats and leave G

ai-native userOpenness — open source, data portability, and self-hosting storiesOpenness3full7/10C

My coding agent can pull real design context — frames, variables, screenshots, component mappings — through an MCP server or API to implement the design C

Agent ops

ai-native userAgent design — stories about agent design in this arenaAgent design3partial6/10T

I get professional vector tools — pen and path editing, boolean operations, precise alignment — for real interface design work C

Canvas

designerVector editing — stories about vector editing in this arenaVector editing3partial5/10C

Build reusable components with variants and per-instance overrides that stay linked to their source C

Design systems

designerComponents design systems — stories about components design systems in this arenaComponents design systems3partial4/10C

Inspect any layer and get measurements, styles, assets, and code snippets (CSS/iOS/Android) without an editor seat G

Handoff

developerDev handoff — stories about dev handoff in this arenaDev handoff3none0/10

Self-host the core product G

ai-native userOpenness — open source, data portability, and self-hosting storiesOpenness3none0/10

Prevent my data from being used to train AI models G

ai-native userPrivacy posture — data-handling and privacy storiesPrivacy posture3noneuntestednone yet

An agent can create or modify designs programmatically — through a write-capable API, plugin surface, or MCP tools — not just read them C

Agent ops

ai-native userAgent design — stories about agent design in this arenaAgent design2full8/10T

Designs map to production code — component-to-code mappings or direct design-to-code output I can actually ship C

Handoff

developerDev handoff — stories about dev handoff in this arenaDev handoff2full7/10C

Generate or edit designs from a natural-language prompt — first drafts, layouts, or full mockups the tool actually produces C

Ai

designerAi design — stories about ai design in this arenaAi design2full7/10C

Full version history lets me name milestones, compare, and restore any earlier state of a file C

Files

designerVersioning export — stories about versioning export in this arenaVersioning export2partial6/10C

Wire screens into clickable prototypes with triggers, transitions, and overlays — no code required C

designerPrototyping — stories about prototyping in this arenaPrototyping2partial6/10C

Do everything through the API that I can do in the UI G

ai-native userOpenness — open source, data portability, and self-hosting storiesOpenness2partial5/10T

An agent can render and export designs — screenshots, images, or production formats — through a documented programmatic surface C

Agent ops

ai-native userAgent design — stories about agent design in this arenaAgent design2partial4/10T

Comment directly on designs, mention teammates, and resolve threads so review happens in the file, not in email C

Collaboration

product managerCollaboration multiplayer — stories about collaboration multiplayer in this arenaCollaboration multiplayer2partial4/10C

Shared libraries publish components and styles across files and projects, with controlled updates when the source changes C

Design systems

designerComponents design systems — stories about components design systems in this arenaComponents design systems2partial4/10C

The free tier supports real design work — usable editor and collaboration without a paid seat G

Pricing

designerPricing plans — plan structure and value — what each tier costs and what it unlocksPricing plans2partial3/10C

A documented plugin API with typings and samples lets me build and distribute my own editor extensions C

Plugins

developerPlugins extensibility — stories about plugins extensibility in this arenaPlugins extensibility2none0/10

Export production assets — PNG, SVG, PDF, and more — with per-layer presets, scales, and slices C

Files

designerVersioning export — stories about versioning export in this arenaVersioning export2none0/10

Frames can behave responsively — auto layout, constraints, and grids resize designs the way real UIs flex C

Canvas

designerVector editing — stories about vector editing in this arenaVector editing2none0/10

Manage design tokens or variables — colors, spacing, typography — with modes or themes applied across designs C

Design systems

designerComponents design systems — stories about components design systems in this arenaComponents design systems2none0/10

Self-host the full design platform on my own infrastructure under an open-source license C

Files

developerVersioning export — stories about versioning export in this arenaVersioning export2none0/10

Choose where my data is stored (region/residency) G

ai-native userPrivacy posture — data-handling and privacy storiesPrivacy posture2noneuntestednone yet

Control data retention and deletion G

ai-native userPrivacy posture — data-handling and privacy storiesPrivacy posture2noneuntestednone yet

Extend the editor from a large plugin community or marketplace — icons, data fillers, accessibility checkers, and more G

Plugins

designerPlugins extensibility — stories about plugins extensibility in this arenaPlugins extensibility2noneuntestednone yet

Opt out of telemetry and usage tracking G

ai-native userPrivacy posture — data-handling and privacy storiesPrivacy posture2noneuntestednone yet

Perform bulk operations across many items at once G

ai-native userAutomation depth — how much of the product can run unattendedAutomation depth2noneuntestednone yet

Read the product's source under an open license G

ai-native userOpenness — open source, data portability, and self-hosting storiesOpenness2noneuntestednone yet

Schedule recurring jobs or workflows G

ai-native userAutomation depth — how much of the product can run unattendedAutomation depth2n/auntestednone yet

Prototypes can carry advanced behavior — animation between states, conditions or variables, scroll effects — to feel like the real product C

designerPrototyping — stories about prototyping in this arenaPrototyping1full8/10C

The file format is open or documented, so my designs stay portable and toolable outside the vendor's editor C

Files

developerVersioning export — stories about versioning export in this arenaVersioning export1partial5/10C

Version, review, and roll back my automations G

ai-native userAutomation depth — how much of the product can run unattendedAutomation depth1partial5/10C

Built-in AI handles asset chores — image generation, background removal, content-aware fills, copy suggestions — inside the editor C

Ai

designerAi design — stories about ai design in this arenaAi design1partial3/10C

Published plan pricing makes seat types, tiers, and AI-feature gating clear before procurement G

Pricing

product managerPricing plans — plan structure and value — what each tier costs and what it unlocksPricing plans1partial2/10C

Opportunities — the stories that would move this product's scores, from its own judged verdictsOpportunitiestop 8 of 37 stories with headroom

What would move Spline’s scores — derived from its own judged verdicts, biggest headroom first. Each line quotes what the judge found missing; shipping it (or evidencing it publicly) is the fix.

  1. Agenticness — how well agents can access and operate the productPlug MCP servers into this product so it can use their tools

    nonemoves agent-readyimpact 45

    All evidence describes Spline shipping an MCP *server* (docs-13, docs-25, docs-36, docs-53) that external MCP clients like Claude/Cursor/Codex connect to — the reverse of this story, which asks whether a user can plug external MCP servers into Spline so its own AI agent can use their tools.

  2. Dev handoff — stories about dev handoff in this arenaInspect any layer and get measurements, styles, assets, and code snippets (CSS/iOS/Android) without an editor seat

    nonemoves PA Scoreimpact 30

    Spline's docs describe code export as full-scene exports (Vanilla JS, Three.js, React, Next.js, react-three-fiber) and a Code API for developers, but there is no evidence of a dev-handoff/inspect mode that lets a non-editor viewer inspect a specific layer for measurements, styles, assets, or CSS/iOS/Android snippets without holding an editor seat.

  3. Openness — open source, data portability, and self-hosting storiesSelf-host the core product

    nonemoves PA Scoreimpact 30

    Spline is an inherently cloud/multiplayer SaaS editor ('files live in the cloud', 'multiplayer from the ground up') with no evidence of a self-hostable core editor.

  4. Privacy posture — data-handling and privacy storiesPrevent my data from being used to train AI models

    nonemoves PA Scoreimpact 30

    No evidence in the pack addresses AI-training data opt-out, privacy settings, or data usage policies for model training; the docs focus entirely on design/collaboration/AI-generation features with no mention of privacy controls or training data exclusion.

  5. Agenticness — how well agents can access and operate the productRun the product headlessly / in CI for automation

    nonemoves agent-readyimpact 30

    Spline is documented purely as a browser/desktop GUI editor with a multiplayer, real-time canvas; its MCP server explicitly requires the desktop app with 'your open editor tab' running interactively, and no CLI, headless render mode, or CI-triggerable build/export process is documented anywhere in the evidence pack.

  6. Agenticness — how well agents can access and operate the productIssue scoped/least-privilege API credentials for an agent

    nonemoves agent-readyimpact 30

    Missing: any documentation of credential/token scoping, permission levels, or least-privilege API key issuance for agents.

  7. Agenticness — how well agents can access and operate the productExplore an interactive API reference with runnable examples

    nonemoves API qualityimpact 30

    Spline documents several APIs (Code API, Real-time API, webhooks) but the evidence pack shows no interactive API reference with runnable examples — a probe for OpenAPI/swagger specs returned 404 on all candidate paths, and the docs are plain markdown descriptions rather than an interactive sandbox.

  8. Agenticness — how well agents can access and operate the productDownload a machine-readable API spec (OpenAPI or equivalent)

    nonemoves API qualityimpact 30

    A direct probe for OpenAPI/swagger specs at common paths returned 404 across all candidates, and no documentation references a downloadable machine-readable API spec; Spline offers a Real-time API and Code API but no OpenAPI equivalent is evidenced.

Showing the top 8 of 37 — every none/partial verdict in the story verdicts table is headroom.

Think a verdict is wrong? Every verdicts-table row has a Flag link — see the methodology.

Coverage map — which docs area, API section, or community source covers which judged storiesCoverage map10 surfaces · 29 covered stories

Where the cited evidence behind each covered verdict came from — the same citations the verdicts table shows, no extra judging.

Basics docs19 stories

Probe proofs — replayable recordings from the probe harnessProbe proofs

Replayable recordings from our probe harness — see the Prove-It protocol to submit one.

$curl -sL https://docs.spline.design/llms.txt | head -3reproduced
$ curl -sL https://docs.spline.design/llms.txt | head -3
# Spline Documentation

## Docs

Claims vs evidence — vendor claims reconciled against independent verdictsClaims vs evidence

2 of 12 testable claims verified · 0 contradictedintegrity 17/100

19 distinct capability claims found in Spline’s own claimed-docs/GitHub materials, reconciled against our judge’s independent verdicts.

2

Verified

10

Unverified

0

Contradicted

17

Undersold

Verified (4)
Unverified (11)
Undersold (17)
Claims outside our story set (4)

Real capability claims found in Spline’s own materials, but no story in this arena’s taxonomy covers them yet — that’s feedback on the taxonomy, not a mark against the product.

  • Design and ship interactive 3D/2D experiences to web, iOS and Android without writing code

    source ↗
  • A native <spline-viewer> HTML web component can embed published scenes in any web builder, framework, or browser

    source ↗
  • A file can embed a full HTML/CSS/JS document rendered in a sandboxed iframe layered over the 3D canvas

    source ↗
  • Desktop app supports working across multiple files in tabs and uses installed system fonts

    source ↗
Suggest a story for these →

Business model

free-tiersubscription-per-seatenterprise-custom

Free personal plan, then per-seat Super/Super Team tiers that unlock exports, higher limits, and AI features; custom Enterprise contracts.

pricing ↗

Score trend

How this product’s scores have moved as evidence and verdicts are re-derived — a point per change, not per day.

PA Score33 (Sep 14 '26)32 (Sep 16 '26)
Agent-ready39 (Sep 14 '26)40 (Sep 16 '26)

Try Experimental

Run it in the microterminal →

Recorded agent sessions — and a live MCP handshake where the vendor ships one.

Flag

⚑ Flag a verdict

Think a verdict is wrong? Opens a prefilled GitHub issue — or use the ⚑ next to any verdict above.

Badge

Embed this product's score badge →

Hotlinked SVG — always shows the live current score.

For agents

Data