Sparta
Tests agents against sealed replicas of production systems, recording state changes and failures.
≈ 2visits/mo
Emerging · estimate, read 2026-10-01
- For
- Teams building AI agents that interact with business systems like Stripe and Zendesk
- Price
- Freepricing page, read 2026-10-01 ↗
- Activity
- Activity not read yet
- Company
- founding year not on record
- Runs as
- API
- Test agent actions against sealed system replicas with exact proof
- Verify agent behavior by checking what actually changed in systems
- Inject failures and advance time to test retry logic and billing
- Raised$42M · Series Bper the press · 2025-02 ↗
Figure and bar: visits/mo, estimate · year: online since
- #1
Logic, Inc.
Deploys agents from plain English specifications as typed REST APIs with built-in testing and versioning.
729MaintainedFrom $49/mo - #2
Checksum
Generates, runs, and automatically repairs Playwright tests across your application as code changes.
95ActiveFree plan - #3
FetchSandbox MCPMCP · open
Runs deterministic tests for coding agents by verifying API integrations fail before fixes and pass after.
55ActiveFrom $200/mo - #4
Revyl
Develops and tests mobile applications in cloud environments with runtime verification and visual evidence.
21ActiveFrom $250/mo2024 - #5
BrowserBash
Converts plain English descriptions into browser automation tests with machine-readable verdicts for AI agents.
18ActiveFree - #6
ProductNowMCP · sign-in
Pulls signals from code, calls, CRM and tickets, reconciles them into linked context that agents query and write back to.
18Active—
What is Sparta?
Tests agents against sealed replicas of production systems, recording state changes and failures. It is listed in the Atlas under Developer tools.
Who is Sparta for?
Teams building AI agents that interact with business systems like Stripe and Zendesk
How much does Sparta cost?
Sparta is free, per its pricing page on 2026-10-01.
Is Sparta free?
Yes: Sparta is free, per its pricing page on 2026-10-01.
Do people use Sparta?
Emerging: ≈ 2 visits/mo · estimate, 2026-10.
What are alternatives to Sparta?
In Developer tools, by use: Logic, Inc., Checksum, FetchSandbox MCP, Revyl, BrowserBash, ProductNow.
Not quite it? Describe the job
betaFive tools from the Atlas that fit it, each judged against what you wrote.
How we read a tool
No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.
- Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
- Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
- Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
- The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.
How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.