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SpecLeft

specleft.dev·Infrastructure

SpecLeft is an open-source CLI tool that turns declared behavioral intent into machine-verifiable checks, helping engineering teams catch missing behavior in AI-generated code before it reaches production. It supports offline use and integrates with development workflows.

Open SourceApache-2.0
CLISelf-hosted
S
SpecLeft preview
Visit specleft.dev↗
⭐3
stars
🍴1
fork
✓5
features
📅2026
since

Overview

5 features

SpecLeft sits in PulseGate's Testing & QA category. It focuses on ensuring AI-generated code meets declared behavioral intent before reaching production. It is built as an open-source project for software developers and QA engineers. SpecLeft is open source under the Apache-2.0 license. The product ships for the command line, and it can be self-hosted.

SpecLeft first shipped in 2026. Key capabilities include behavioral intent checks, machine-verifiable tests, and traceability.

  • ✓Behavioral intent checks
  • ✓Machine-verifiable tests
  • ✓Traceability
  • ✓Offline-first
  • ✓Open source

Tags

behavioral-testingintent-verificationai-code-quality

AI capabilities

CodeInference: LocalWeights: Open

Built with & integrations

Framework
astro
Hosting
cloudflarerender
Runs on
CLISelf-hosted

Trust & compliance

LicenseApache-2.0
Verified signals
✓ HTTPS✓ Privacy Policy✓ Open Source✓ Free tier✓ GitHub · ★ 3
Legal
Privacy Policy →

Recent events

Latest indexed changes and source events

  1. IndexedJun 28, 1:17 PM

    Listing verified by the PulseGate indexer

    Source: PulseGate indexerOpen ↗

Frequently asked questions about SpecLeft

What does SpecLeft do?
SpecLeft focuses on ensuring AI-generated code meets declared behavioral intent before reaching production. It is catalogued under Testing & QA on PulseGate.
Who is SpecLeft for?
SpecLeft is an open-source project built for software developers and QA engineers.
Is SpecLeft free?
Yes — SpecLeft is open source under the Apache-2.0 license and free to use.
What platforms does SpecLeft run on?
SpecLeft runs on the command line. It can also be self-hosted.
Is SpecLeft still maintained?
PulseGate's liveness checks currently classify SpecLeft as active.
What are alternatives to SpecLeft?
Similar tools tracked by PulseGate include MySpec, Spec, and SpecSource.MySpecSpecSpecSource
When did SpecLeft launch?
SpecLeft first shipped in 2026.
Is SpecLeft open source?
Yes — SpecLeft is open source under the Apache-2.0 license, developed on GitHub.

At a glance

Pricing
Open Source
Platforms
Cli
Languages
English
Open source
Yes · ★ 3
License
Apache-2.0
First seen
Jan 26, 2026
Activity
🟢 Active
Status
🟢 Active
Built for
software developers and QA engineers
Model
Open source
Solves
Ensuring AI-generated code meets declared behavioral intent before reaching production.

Developer

Specleft
Small team
↗ GitHub

Open source

View on GitHub →
⭐ Stars
3
🍴 Forks
1
Open issues
26
Last commit
3mo ago
Commits 90d
0
Contributors
3
Authorship
Small team
Default branch
main
Latest release
v0.4.0 · 5mo ago

Live coverage

Confidence
High · 95
Indexed
Jun 28, 2026
Lifecycle
Alive
Activity
Active
First seen
Jan 2026
Last seen
1mo ago
Identity audit (9)
Entity ID
cmqxtdx1f04u0p1xphdf7aohu
Slug
specleft-behavioral-intent-for-ai-driven-development-specleft-dev
Verification state
Indexed for public listing
Claim / listing state
Unclaimed · listed: yes
Index status
Included in index
Latest evidence snapshot
Jun 28, 2026
Timeline basis
Indexed-at chronology (no inferred launch/funding milestones).
Last updated
Jun 28, 2026
Canonical URL
https://specleft.dev/

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    openspec.dev
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    speclens.ai
  • ChangeSpec
    changespec.com