Software Alternatives, Accelerators & Startups

Rextester VS Emisar.dev

Compare Rextester VS Emisar.dev and see what are their differences

Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Rextester logo Rextester

Online compiler for many languages, including MySQL

Emisar.dev logo Emisar.dev

One governed MCP server connects any AI agent to a finite action catalog, enforced on-host with pack trust, policy gates, human approvals, and a hash-chained audit trail.
  • Rextester Landing page
    Landing page //
    2022-10-01
  • Emisar.dev Approvals
    Approvals //
    2026-07-21
  • Emisar.dev Audit Log
    Audit Log //
    2026-07-21
  • Emisar.dev Policies
    Policies //
    2026-07-21
  • Emisar.dev Runner fleet
    Runner fleet //
    2026-07-21

Emisar is the last MCP server youโ€™ll need to install: a Zero-Trust gateway connecting Claude, Cursor, ChatGPT, and any AI agent to your infrastructure. One server handles production access, debugging, alerts, and internal operations, with new capabilities added as packs. Agents can inspect real production state, debug what they shipped, and help resolve incidents. Safe reads run automatically; policy allows, blocks, or routes risky actions for approval. No SSH keys, VPNs, remote shells, or standing shell access โ€” and every call is recorded.

Emisar.dev

Website
emisar.dev
$ Details
freemium $20.0 / Monthly (per runner)
Startup details
Country
United States
State
CA
Founder(s)
Andrew Dryga
Employees
1 - 9

Category Popularity

0-100% (relative to Rextester and Emisar.dev)
IDEs And Text Editors
100 100%
0% 0
Infrastructure Monitoring
Programming Language
100 100%
0% 0
Infrastructure Management

Questions & Answers

As answered by people managing Rextester and Emisar.dev.

How would you describe the primary audience of your product?

Emisar.dev's answer:

emisar is for SRE, DevOps, platform engineering, infrastructure, and security teams that want AI agents to inspect and operate production systems. It is especially relevant to teams managing multiple Linux hosts, clusters, databases, cloud services, or regulated environments where unrestricted shell access and incomplete audit records are unacceptable.

Which are the primary technologies used for building your product?

Emisar.dev's answer:

The hosted control plane and operator interface use Elixir, Phoenix, LiveView, PostgreSQL, and Tailwind CSS. The host runner and MCP bridge are written in Go. Action packs use YAML and JSON Schema, while production infrastructure is managed with Terraform on Google Cloud. The system communicates through MCP, OAuth 2.1, TLS, and WebSockets.

Who are some of the biggest customers of your product?

Emisar.dev's answer:

  • Blitz.gg - game analytics for billions of matches and a pretty large infrastructure.

What's the story behind your product?

Emisar.dev's answer:

Founder Andrii Dryga spent a decade working as a CTO, full-stack engineer, SRE, and DevOps engineer. He experienced the cost of running the wrong command on the wrong cluster, while also seeing AI solve operational problems in seconds. emisar grew from the need to preserve both truths: AI agents are useful, and production access must remain bounded. Its answer is to give agents a reviewed catalog of operations instead of a blank terminal.

What makes your product unique?

Emisar.dev's answer:

emisar lets AI agents work on real infrastructure without giving them a shell. Agents choose from a finite catalog of typed, versioned actions. Policy decides what runs, what requires approval, and what is denied, while an outbound-only runner verifies the action again on the host. New capabilities arrive as packs behind the same MCP integration, and every request is recorded in both a searchable audit trail and a tamper-evident host journal. [

Why should a person choose your product over its competitors?

Emisar.dev's answer:

Choose emisar when you want an agent to keep investigating and handling routine operations without handing it SSH credentials or supervising every call. Compared with raw shell access, copy-paste workflows, or one-off MCP servers, emisar provides reviewed action contracts, host-level enforcement, risk-based policy, scoped access, approvals, pack integrity checks, and a durable audit trail. It is built specifically for governed infrastructure access rather than generic automation.

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Rextester and Emisar.dev

Rextester Reviews

Best Online Code Editors For Web Developers
It supports around 30 languages including Java, but it is more popular among C# users. Rextester started as a Regular Expression Tester, later grew to be an online IDE.
Source: techarge.in

Emisar.dev Reviews

We have no reviews of Emisar.dev yet.
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Social recommendations and mentions

Based on our record, Rextester seems to be more popular. It has been mentiond 7 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Rextester mentions (7)

  • I NEED HELP WITH AN ASSEMBLY PROJECT!!!
    My Professor has not provided any resources or material to help complete this project, I have tried to problem solve, use the internet, even chatgpt. (I can send the code that it gave me in comments if needed, but ) I need help completely this assignment hopefully by midnight PST tonight. I am using an online compiler (rextester.com). Any help would be greatly appreciated, here is the project description below. Source: over 3 years ago
  • Why is Zig so much more successful than Crystal and Nim?
    Does it really do that? (I've just tried in rextester.com, it complains about declared but unused variables.). Source: over 3 years ago
  • Trying to do errors right
    (A quick survey of some of the languages at rextester.com showed that they are usually counted from 1. I'd suggest doing the same would be least surprising.). Source: about 4 years ago
  • void main() vs int main()
    Some clangs (eg. The one on rextester.com) accept the spam() program too. Source: almost 5 years ago
  • I have added named function parameters to my programming language. What do you think, why do most mainstream programming languages not have it, when it is easy to implement in a compiler and it makes it easier to initialize complicated objects with many default rarely-changed parameters?
    On Windows, C compilers tend to evaluate right-to-left. On rextester.com, gcc and clang evaluate as you suggest. Source: almost 5 years ago
View more

Emisar.dev mentions (0)

We have not tracked any mentions of Emisar.dev yet. Tracking of Emisar.dev recommendations started around Jul 2026.

What are some alternatives?

When comparing Rextester and Emisar.dev, you can also consider the following products

SQL Fiddle - A tool for easy online testing and sharing of database problems and their solutions.

ExtendsClass SQL Online - Online SQL playground for testing and sharing SQL snippets. SQLite, MySQL and PostgreSQL.

DB Fiddle - An online tool for testing, sharing and collaborating on SQL snippets

regular expressions 101 - Extensive regex tester and debugger with highlighting for PHP, PCRE, Python and JavaScript.

V (programming language) - Simple, fast, safe, compiled language for developing maintainable software.

Online SQL Editor - Free Online SQL Editor