Builder Edition
Free
- query operations
- 18
- codebase analyzers
- 5
- grammars
- 138 of 163
- All queries
- 5 analysis tools
- Rename and fix-auto
- Non-commercial use
act101 pricing
Quality infrastructure for AI-written code: deterministic refactoring, porting across grammars, and a merge gate with signed receipts.
- Free plan
- Yes
- Paid from
- $29/mo
- Plans
- 6
- Free trial
- 7 days
What is act101?
act101 is quality infrastructure for AI-written code, aimed at engineers, codebase owners, and open-source maintainers running coding agents. It provides deterministic refactoring and porting across many grammars, plus act gate, a merge gate that returns a consistent MERGE, REVIEW, or BLOCK verdict with a signed receipt and one-command rollback. Analyzers map dead code, cycles, coupling, and hotspots, while refactors handle rename, extract, inline, move, and modernize. It is available through MCP and a CLI as one native binary. A free Builder Edition covers non-commercial and open-source use, and a paid Engineering Edition adds the full mutation toolkit.
Plans and prices
Engineering Edition
$29/mo
$24.92/mo billed yearlysave 14%
- Everything in Builder
- Extract, inline, wrap, introduce
- Generated constructors and accessors
- Refactor verification and receipts
- Commercial license
Architecture Edition
$59/mo
$49.92/mo billed yearlysave 15%
- Everything in Engineering
- Structural refactors and decomposition
- Code scaffolding tools
- Whole-codebase taint and git overlays
- Team licensing
Elite Edition
$99/mo
$83.25/mo billed yearlysave 16%
- Everything in Architecture
- Legacy languages: COBOL, Fortran, Ada
- Blockchain: Solidity, Vyper
- GPU and shaders: CUDA, GLSL, HLSL, WGSL
Enterprise
Customcontact sales
- Cross-language porting
- Parity verification
- Modernization programs
Fleet
Customcontact sales
- Licensing for agent fleets
- By concurrency, environment, tenant
Prices in USD, as shown by act101.ai. Source: pricing page. Last checked October 29, 2026.
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Copy the prompt below and paste it into the agent you already use. It has the plans and prices from this page and asks you the right questions first.
See the prompt
I want to decide whether act101 (act101.ai) is the right tool and which plan to pick. Below is what the StableMRR pricing directory read from act101's own pricing page (last checked 2026-10-29). It can be out of date, so treat it as a starting point. Category: Developer tools / Testing and QA What it does: Quality infrastructure for AI-written code: deterministic refactoring, porting across grammars, and a merge gate with signed receipts. Free trial: 7 days Plans: - Builder Edition: Free. Limits: query operations 18, codebase analyzers 5, grammars 138 of 163. Includes: All queries, 5 analysis tools, Rename and fix-auto, Non-commercial use - Engineering Edition: $29/mo ($24.92/mo billed yearly). Includes: Everything in Builder, Extract, inline, wrap, introduce, Generated constructors and accessors, Refactor verification and receipts, Commercial license - Architecture Edition: $59/mo ($49.92/mo billed yearly). Includes: Everything in Engineering, Structural refactors and decomposition, Code scaffolding tools, Whole-codebase taint and git overlays, Team licensing - Elite Edition: $99/mo ($83.25/mo billed yearly). Includes: Everything in Architecture, Legacy languages: COBOL, Fortran, Ada, Blockchain: Solidity, Vyper, GPU and shaders: CUDA, GLSL, HLSL, WGSL - Enterprise: Contact sales. Includes: Cross-language porting, Parity verification, Modernization programs - Fleet: Contact sales. Includes: Licensing for agent fleets, By concurrency, environment, tenant Alternatives in the directory: 12 Testers 14 Days, AgentScan, One Accessibility, ADAWCAG.org Pricing page: https://act101.ai/pricing Directory listing: https://stablemrr.com/p/act101-ai First ask me three short questions about my team size, budget and what I need it for. Then recommend one plan, tell me what could make it a bad fit, and compare it with the alternatives. Finish with what I should check on the vendor's site before I pay.
Pricing facts
- Pricing model
- Mixed
- Billing
- monthly or yearly
- Discounts
- Annual billing saves about 15%
About act101
- Platforms
- desktop
- Integrations
- Claude Code, Cursor, Codex, Windsurf, Zed, opencode, GitHub Actions, Paddle
Features
- AST-aware refactor operations
- MCP and CLI interfaces
- Automatic checkpointing
- Instant undo
- Merge gate with verdict and receipt
- Cross-language porting
- Parity verification
- 163 grammars
Price history
No price changes recorded since we started tracking on October 29, 2026.
Alternatives to act101
| Product | Category | Free plan | Paid from | Plans | Checked |
|---|---|---|---|---|---|
| 12 Testers 14 DaysManaged service that supplies Android testers for Google Play closed testing and production access preparation. | Testing and QA | No | $10/mo | 3 | Oct 29, 2026 |
| AgentScanScans Claude and AI agent skills locally for malware, secrets, network calls and license issues before install. | Testing and QA | Yes | - | 2 | Oct 29, 2026 |
| One AccessibilityWordPress accessibility plugin that adds keyboard navigation, screen reader support, and over 50 accessibility features for ADA and WCAG compliance. | Testing and QA | Yes | - | 4 | Oct 29, 2026 |
| ADAWCAG.orgScans websites for WCAG 2.2 AA accessibility failures and helps teams fix and monitor compliance. | Testing and QA | - | - | - | - |
| AfterpromptScans a live website for leaked API keys, exposed files, missing security headers and other issues, with a fix for each. | Testing and QA | - | - | - | - |
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How this page was made. Plans and prices are read automatically from act101.ai's public pricing page, checked against the page text, and re-checked about every week. Method. Something wrong? Tell us.