# Kosa8 vs Rivet.dev

Kosa8 records 0 monthly visits with 0% month-over-month growth and subscription pricing. Rivet.dev records 21,359 monthly visits with -44.3% growth and Freemium, Contact for Pricing pricing.

| Metric | [Kosa8](https://openaitools.app/tool/kosa8) | [Rivet.dev](https://openaitools.app/tool/rivet-dev) |
| :--- | :--- | :--- |
| Website URL | https://kosa8.com | https://rivet.dev |
| Categories | AI Agent, AI Developer Tools | AI Agent, AI Workflow, AI Developer Tools, AI App Builder |
| Pricing Model | subscription | Freemium, Contact for Pricing |
| Monthly Visits | 0 | 21,359 |
| MoM Growth Rate | 0% | -44.3% |
| Primary Market | Global | United States |
| Direct Visits | 0 | 10,710 |
| Review Score | 4.5 | 4.5 |
| Saved Count | 0 | 0 |
| Supported Platforms | Website | Website |

## Kosa8

Kosa8 targets the gap between agents that are useful and agents that are safe to leave unattended. Coding agents such as Claude Code and Codex normally inherit your shell, SSH keys and cloud credentials, so a single poisoned dependency or injected instruction can reach everything you own. Kosa8 instead gives each agent its own sealed virtual machine: a real VM with its own kernel and disk rather than a shared-kernel container. It sees one mounted folder — typically the repository — while API keys remain on your computer and only placeholder values appear inside.

The product is built around control of three things: files, credentials and network. The network is closed except for hosts the agent genuinely needs, routed through an egress broker whose rules are enforced on the host where nothing inside the sandbox can tamper with them. Bad runs are undone with a rewind instead of a rebuild, and a running sandbox can be forked into several live copies so parallel attempts are cheap. Governance features extend this to regulated teams: signed organisation policies, two-person approvals for risky actions, CUI labels that can only rise, FIPS 140-3 builds and signed evidence packages that an auditor reviews without trusting you.

Deployment is deliberately local-first. Kosa8 installs in one line on Apple-silicon Macs, x86-64 Linux, and Windows 11 through WSL2 in preview, and can also run in your own cloud or fully air-gapped. A Docker-compatible API means existing Docker CLI and Compose workflows keep working, and ready-made kits launch Claude Code, Codex, Gemini or your own agents. Security and incident-response teams use the same primitives for malware analysis and training ranges, where detonations produce signed reports and each trainee gets a live clone that resets in seconds.

**Pricing & Plans:** Every plan is free for 14 days with no card required, and each tier includes monthly Kosa8 Cloud credit for cloud sandboxes. Solo is $29/month (4 agents at once, 64 GB of sandboxes, $10 Cloud credit), Pro is $89/month (16 agents, 128 GB, $25 credit), Team is $169 per person per month from 3 people (48 shared agents, 256 GB, $40 credit per person) and Scale is $199 per person per month from 5 people (160 shared agents, 500 GB, $50 credit per person). Billing is cancel-any-time from the billing portal, and annual payment saves roughly 17%. Air-gapped and Enterprise terms are negotiated directly.

- **Sealed VM per agent:** Every agent runs in a genuine VM with its own kernel and disk on Apple's Virtualization framework or KVM, not in a container that shares the host kernel.
- **Credential protection by placeholder:** The sandbox sees one mounted folder and holds placeholder values instead of real API keys, which stay on your host and are brokered only to approved hosts.
- **Host-enforced network egress control:** The network is closed by default; traffic flows only to allow-listed hosts through a broker whose rules live on the host, out of reach of anything inside the sandbox.
- **One-second snapshots and rewind:** Checkpoint before risky work and restore a running machine, processes included, in about a second rather than rebuilding it from scratch.
- **Forking and Docker compatibility:** Clone a running sandbox into multiple live copies, keep the run that passes, and give each trainee or task its own reset-on-demand machine.
- **Tamper-evident audit and approvals:** Every action is hash-chained and marked human or agent, risky steps can require two named approvers, and exports are signed so a third party can verify them offline.

**Strengths:** True VM-level isolation with a per-agent kernel instead of shared-kernel containers; API keys never enter the sandbox, and network egress is closed by default and allow-listed; Fast snapshots, restores and forks make parallel agent runs and disposable ranges practical; Docker CLI and Compose work unchanged, so existing tooling and images carry over

**Limitations:** No permanently free tier — after the 14-day trial you must pick a paid plan starting at $29/month; Host-folder mounts read at roughly a third of native disk speed, so heavy builds should stay inside the sandbox; Full isolation is best on Apple-silicon Macs and x86-64 Linux; Intel Macs, Windows 10/ARM and JioOS need a paired host; Team and Scale tiers are priced per person with seat minimums, which raises the entry cost for small groups

[Profile (Markdown)](https://openaitools.app/tool/kosa8.md)

## Rivet.dev

At its core Rivet replaces the container per agent with an in-process primitive. An Actor runs inside your existing Node.js or Bun backend rather than in its own container or VM, which is why Rivet reports cold starts measured in single-digit milliseconds and a footprint of tens of kilobytes per Actor instead of hundreds of megabytes. Each Actor carries a SQLite database for memory, can access a filesystem and shell, sleeps when idle, and wakes with its durable state ready for the next request.

The platform handles the operational pieces teams usually build themselves: fault tolerance that reschedules Actors when a node goes down, multi-region placement that routes requests to wherever an Actor currently lives, end-to-end type safety where Actor definitions generate client types, and scheduling via cron or self-set timestamps. Storage is pulled apart into two tiers — a fast SSD for instant writes and object storage that settles writes at a fraction of the cost — so running many small databases stays affordable.

Rivet positions itself as infrastructure for the "agentic era" and can be deployed as a managed cloud, inside your own VPC through a bring-your-own-cloud model, or fully self-hosted down to air-gapped networks. It is open source under Apache 2.0, backed by Y Combinator and a16z Speedrun, and integrates with popular coding agents and frameworks.

**Pricing & Plans:** Rivet Cloud uses a plan-plus-nodes model. The control plane is Free ($0) for prototyping, Hobby at $10/month, Team at $120/month, and Enterprise at $900/month, each raising control-plane redundancy, Actor Node caps, and support. Actor Nodes are billed per month on top, from $4.20 (R-5) to $94.50 (R-160). Self-hosting is free and open source under Apache 2.0, and startups from Y Combinator or a16z Speedrun get 50% off the Team plan for 12 months.

- **Durable actors with persistent state:** Every Actor gets a SQLite database and a filesystem, so an agent's memory and progress survive restarts and idle periods without a separate database.
- **Lightweight secure sandboxing:** Run untrusted or AI-generated code on your own infrastructure with fine-grained control over network access, filesystem permissions, and resource limits.
- **Fault tolerance and workflows:** A node failure reschedules its Actors elsewhere with state intact, and multi-step work replays after a crash — with no checkpointing harness to build yourself.
- **Realtime and multiplayer:** Address an Actor directly over HTTP or hold a live WebSocket, and use the React SDK to subscribe components to an Actor's state in real time.
- **One-binary deployment and observability:** Ship with a single stateless Rust binary, embeds storage in S3-compatible buckets, and emits OpenTelemetry traces, metrics, and logs to your existing collector.

**Strengths:** Four-digit millisecond cold starts and a very small per-Actor memory footprint let a single server host far more agents; Open source (Apache 2.0) with a single Rust binary, so it can be self-hosted, run in a VPC, or air-gapped; Durable state via per-Actor SQLite plus object-storage-backed tiers keeps agents restart-safe and cheap; Strong developer ergonomics: typed SDKs, a React SDK, WebSocket networking, and OpenTelemetry baked in

**Limitations:** Requires Node.js or Bun and a working Rust-based control plane deployment for self-hosting, so it favors backend engineers over no-code users; Advanced durability and sandboxing concepts (Actors, WarpDrive storage) carry a learning curve; Managed cloud cost scales with Actor Nodes, which can climb for many mid-sized/sized nodes; Enterprise features like multi-tenancy and hardened compliance guidance sit behind sales conversations

[Profile (Markdown)](https://openaitools.app/tool/rivet-dev.md)

## Frequently Asked Questions

### How do Kosa8 and Rivet.dev compare in monthly traffic?

Kosa8 has 0 monthly visits, while Rivet.dev has 21,359. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Kosa8 has a month-over-month growth rate of 0%; Rivet.dev has -44.3%.

### How does pricing compare?

Kosa8: subscription. Every plan is free for 14 days with no card required, and each tier includes monthly Kosa8 Cloud credit for cloud sandboxes. Solo is $29/month (4 agents at once, 64 GB of sandboxes, $10 Cloud credit), Pro is $89/month (16 agents, 128 GB, $25 credit), Team is $169 per person per month from 3 people (48 shared agents, 256 GB, $40 credit per person) and Scale is $199 per person per month from 5 people (160 shared agents, 500 GB, $50 credit per person). Billing is cancel-any-time from the billing portal, and annual payment saves roughly 17%. Air-gapped and Enterprise terms are negotiated directly. Rivet.dev: Freemium, Contact for Pricing. Rivet Cloud uses a plan-plus-nodes model. The control plane is Free ($0) for prototyping, Hobby at $10/month, Team at $120/month, and Enterprise at $900/month, each raising control-plane redundancy, Actor Node caps, and support. Actor Nodes are billed per month on top, from $4.20 (R-5) to $94.50 (R-160). Self-hosting is free and open source under Apache 2.0, and startups from Y Combinator or a16z Speedrun get 50% off the Team plan for 12 months.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Composio](https://openaitools.app/tool/composio) | 2,782,603 | +22.8% | Freemium, Contact for Pricing | Give your AI agents secure, authenticated access to 1,700+ apps | [.md](https://openaitools.app/tool/composio.md) |
| 2 | [BLACKBOX.AI](https://openaitools.app/tool/blackbox-ai-1) | 622,975 | -27.2% | Free Trial, Paid | High-trust frontier inference, encrypted end to end | [.md](https://openaitools.app/tool/blackbox-ai-1.md) |
| 3 | [Mastra](https://openaitools.app/tool/mastra) | 318,954 | -5% | Freemium, Contact for Pricing | The TypeScript framework for building, deploying, and observing AI agents | [.md](https://openaitools.app/tool/mastra.md) |
| 4 | [Agent 37](https://openaitools.app/tool/agent-37) | 180,030 | +24.2% | Free Trial, Contact for Pricing | The low-cost cloud sandbox where AI agents actually live | [.md](https://openaitools.app/tool/agent-37.md) |
| 5 | [Coder](https://openaitools.app/tool/coder) | 149,417 | -12.8% | Free Trial, Contact for Pricing, Free | Self-hosted cloud development environments and AI coding agents for enterprise teams | [.md](https://openaitools.app/tool/coder.md) |
| 6 | [boat](https://openaitools.app/tool/boat) | 66,870 | +520.8% | Free Trial, Paid | Persistent Ubuntu cloud VMs built for AI agent factories | [.md](https://openaitools.app/tool/boat.md) |
| 7 | [InsForge](https://openaitools.app/tool/insforge) | 60,257 | -11.3% | Freemium, Contact for Pricing, Free | Agent-native cloud infrastructure that lets coding agents run the whole backend stack | [.md](https://openaitools.app/tool/insforge.md) |
| 8 | [exe.dev](https://openaitools.app/tool/exe-dev) | 60,103 | -26.4% | Freemium, Paid | Cloud Linux VMs built for developers and their AI agents | [.md](https://openaitools.app/tool/exe-dev.md) |
| 9 | [FlexAI](https://openaitools.app/tool/flexai) | 44,314 | +17.9% | Freemium, Paid, Contact for Pricing | Build, run and scale AI, from open models to governed agents | [.md](https://openaitools.app/tool/flexai.md) |
| 10 | [Modelence](https://openaitools.app/tool/modelence) | 31,915 | -0.9% | Freemium, Paid | Production cloud on autopilot for full-stack and AI apps | [.md](https://openaitools.app/tool/modelence.md) |

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Source: https://openaitools.app/compare/kosa8-vs-rivet-dev

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