Helicon vs TestFlows Machine
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Helicon compared with TestFlows Machine
| Detail | 
Helicon | 
TestFlows Machine |
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| What it does | Free, open-source desktop and web app for Meta's Muse Code CLI
| Run your programs deterministically. Record, replay, and branch your runs.
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| Stage | Not given
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| Founded | Not given
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| Based in | IN
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| Pricing model | Open source
| Freemium
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| Pricing | Free, MIT licensed, no paid tier, no trial, no seats, no account. Runs on your existing Muse Code subscription.
| Free: €0 with ₡3 credits included each month (about 20 vCPU-hours). Starter: €10/month with ₡25 credits (about 166 vCPU-hours). Plus: €25/month with ₡65 credits (about 433 vCPU-hours). Pro: €50/month with ₡150 credits (about 1,000 vCPU-hours). Dedicated: contact sales. Usage credits: €1 a credit, pu
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| Key features | - Projects and sessions grouped by working directory and git worktrees
- Resume sessions including those started in the terminal TUI
- Inline diffs in the thread at the turn that produced them
- Every agent approval surfaced and never bypassed
- Cost tracking at published API rates per thread
- Full keyboard navigation with command palette
- File viewer with source, Markdown, image, video and PDF preview
- Remote daemon support for running the agent on another machine
- VS Code extension available
- Native Windows support with PowerShell
| - Record runs with non-deterministic inputs pinned down
- Replay runs instruction-by-instruction
- Checkpoint and fork from any point
- Fault injection for disk, network, clock, containers and system calls
- Built-in debugger for machine programs
- Machine client and Python SDK
- Cloud storage for runs and disk images
- Multiple simultaneous sessions with configurable vCPUs
- Configurable session disk up to 256G
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| What makes it different | - No additional cost or billing on top of existing Muse Code subscription
- Credentials stay with the muse CLI, never stored by Helicon
- Native Windows support without requiring WSL
- MIT licensed open-source with no company behind it
- Sessions and approvals never bypassed or batched
| - Deterministic replay of program runs with identical outcomes
- Fork and branch from any point without losing original timeline
- Comprehensive fault injection testing built-in
- Pay-as-you-go usage credits with free plan available
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 11 ▼ −1 (down) since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 14 | 4 |
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| Citation Flow (Majestic) | 27 | 21 |
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| Referring domains (Majestic) | 34 | 27 |
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5 details filled in for both companies.
More alternatives to Helicon More alternatives to TestFlows Machine