Software Alternatives, Accelerators & Startups

sish VS EchoRelay.dev

Compare sish VS EchoRelay.dev and see what are their differences

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sish logo sish

An open source serveo/ngrok alternative. HTTP(S)/WS(S)/TCP Tunnels to localhost using only SSH.

EchoRelay.dev logo EchoRelay.dev

EchoRelay is a managed runtime for custom API integrations. You own a handful of adapters that break whenever a vendor changes something. We operate them instead. When a field gets renamed, you edit the mapping and publish. Deploy nothing.
  • sish Landing page
    Landing page //
    2023-09-25
  • EchoRelay.dev Managed API integrations
    Managed API integrations //
    2026-08-31
  • EchoRelay.dev Your integrations, versioned
    Your integrations, versioned //
    2026-08-31
  • EchoRelay.dev Where a request goes, and how
    Where a request goes, and how //
    2026-08-31
  • EchoRelay.dev One mapping, two editors
    One mapping, two editors //
    2026-08-31
  • EchoRelay.dev Every request, with its attempts
    Every request, with its attempts //
    2026-08-31
  • EchoRelay.dev Retry or discard, one by one
    Retry or discard, one by one //
    2026-08-31

EchoRelay is a managed runtime for custom API integrations.

Describe one integration once: what comes in, the target system, credentials, the retry policy, and how the answer maps back. EchoRelay validates each inbound request, maps it, replies synchronously, passes streams through, fans out to multiple targets, or queues delivery with automatic retry, a dead-letter queue and replay.

Every configuration change is versioned. Preview, diff, dry run, schedule, publish and roll back. When a vendor changes their API or rotates a credential, you update the configuration and publish. Deploy nothing.

Build and operate each integration through the REST API, an MCP server so an AI agent can do the wiring, or the web panel. Free to start, no card required.

Docs: https://docs.echorelay.dev · Pricing: https://echorelay.dev/pricing

sish

Website
github.com
Pricing URL
-
$ Details
-
Platforms
-
Release Date
-

EchoRelay.dev

$ Details
freemium
Platforms
Web REST API iOS Android
Release Date
2026 June

sish features and specs

  • Open Source
    sish is open-source, allowing users to inspect, modify, and contribute to the project's codebase.
  • Self-Hosted
    Users can host their own instance of sish, giving them complete control over their tunneling service and associated data.
  • Simple Setup
    The installation and setup process for sish is straightforward, requiring minimal configuration to get started.
  • Custom Subdomains
    sish allows users to utilize custom subdomains for their tunnels, enhancing branding and easier access.
  • Security Features
    Built-in support for TLS and authentication options, ensuring that tunnels are secure and accessible only to authorized users.
  • Portability
    sish supports multiple platforms, allowing it to be used in various environments such as local development, testing, or cloud deployment.

Possible disadvantages of sish

  • Self-Management
    Users need to manage their own server and configurations, which can require additional maintenance and oversight compared to managed services.
  • Resource Consumption
    Hosting your own instance of sish requires computational resources, which could be a con if the service is heavily used.
  • Complexity for Non-Developers
    Non-developers might find the setup and maintenance process challenging without prior experience in server management and configuration.
  • Limited Community Support
    As a niche project, sish may not have as large of a community or as many resources available for troubleshooting as more popular alternatives.
  • No Built-In Analytics
    Unlike some other tunneling services, sish does not provide built-in analytics or monitoring tools, requiring users to implement their own solutions.

EchoRelay.dev features and specs

  • Versioned configuration
    Each integration is configuration, not code you deploy. Preview it, dry run it, publish it, roll it back.
  • Request and answer mapping
    Reshape what comes in and what goes back. Edit the mapping as JSON or in a visual builder; both read back the same thing.
  • Queued, synchronous and streaming delivery
    Queue a request with automatic retry, answer inline, or pass a stream straight through to the caller.
  • Fan out to many targets
    One request in, delivered to every target you configured, each shaped by its own mapping.
  • Delivery receipts
    Every delivery leaves a record: the target, the outcome, the attempts and the callback.
  • Failed deliveries you can replay
    Deliveries that run out of attempts wait with their reason and payload. Replay one, or all of them.
  • Credential vault
    Target credentials are stored sealed and can be rotated without touching the integration that uses them.
  • REST API, MCP server and web panel
    Build and operate an integration from code, from an AI agent, or by hand. All three edit the same versioned model.

Analysis of sish

Overall verdict

  • Overall, Sish is considered a good choice for those looking for a straightforward tunneling solution, especially if they are familiar with SSH. It provides reliable service without the need for complex setups, making it a popular option among developers who prefer lightweight and open-source tools.

Why this product is good

  • Sish is a simple, open-source tool that allows users to serve local applications over the internet using SSH. It's appreciated for its ease of use, minimal configuration, and the ability to handle dynamic port forwarding, making it suitable for both individual developers and small teams seeking an alternative to Ngrok or similar services.

Recommended for

  • Developers who are familiar with SSH and want a simple way to expose their local applications.
  • Teams looking for a free and open-source alternative to paid tunneling services like Ngrok.
  • Individuals who need to quickly share a local application without involving complex configurations.
  • Developers working on side projects or prototypes who need a temporary way to test webhooks or collaborate over the internet.

Category Popularity

0-100% (relative to sish and EchoRelay.dev)
Localhost Tools
100 100%
0% 0
Developer Tools
0 0%
100% 100
Testing
100 100%
0% 0
Software Development
0 0%
100% 100

Questions & Answers

As answered by people managing sish and EchoRelay.dev.

What makes your product unique?

EchoRelay.dev's answer:

What costs you money in an integration is not building it, it is the week a vendor renames a field. EchoRelay holds each integration as configuration instead of code you deploy: what comes in, where it goes, how it authenticates, what happens when the target is down, and how the answer maps back. Change any of it, preview the diff, publish, roll back if you were wrong. Deploy nothing. Every request leaves a delivery receipt, so when someone asks whether an order reached the warehouse, you answer from the record rather than from the logs.

How would you describe the primary audience of your product?

EchoRelay.dev's answer:

Software teams that maintain a handful of custom integrations and have nobody whose job that is. There are developers, which is why they can run a runtime and read a mapping, but no integration team, so every vendor change competes with the product roadmap for the same people. Typically a shop wired into an ERP, a tax office, a fulfilment partner and a few marketing tools, or a product reselling a dozen vendor APIs behind one format of its own.

Why should a person choose your product over its competitors?

EchoRelay.dev's answer:

Most alternatives are one of two things: a catalogue of prebuilt connectors for popular products, or a workflow canvas. Neither helps with the adapter you had to write yourself, because the system on the other end is a customer's ERP or a partner's ordering API that nobody ships a connector for. EchoRelay is for that one. You describe it once and we operate it. The real comparison is the adapter service you would otherwise build and maintain in-house, and the difference is that a schema change becomes a mapping edit instead of a release.

What's the story behind your product?

EchoRelay.dev's answer:

It started from a pattern that shows up in almost every software team that talks to systems it does not control. The integrations that hurt are never the popular ones with a ready-made connector. They are the customer's ERP, the partner's ordering API, the tax office endpoint: one-off adapters somebody wrote once and now nobody wants to own.

The cost is not writing them. It is everything after. A vendor renames a field and someone edits adapter code, deploys it and hopes nothing else moved. A credential rotates and the adapter quietly breaks until a customer notices. The vendor has an outage and the retry logic you wrote yourself has to absorb it. Then someone asks whether an order actually arrived, and the honest answer is buried in logs.

EchoRelay was built to move that work out of application code. Describe the integration once as configuration: what comes in, where it goes, how it authenticates, what happens when the target is down, and how the answer maps back. When the vendor changes something, you change the mapping, preview the diff, publish, and roll back if you were wrong. Deploy nothing. Every request leaves a delivery receipt, so the question about that order has an answer you can point at.

Which are the primary technologies used for building your product?

EchoRelay.dev's answer:

Nothing you have to install or operate. From the outside EchoRelay is plain HTTP: a REST API, an MCP server so an AI agent can do the wiring, and a web panel. You send a request to an address and we handle the rest.

User comments

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Social recommendations and mentions

Based on our record, sish seems to be more popular. It has been mentiond 17 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.

sish mentions (17)

View more

EchoRelay.dev mentions (0)

We have not tracked any mentions of EchoRelay.dev yet. Tracking of EchoRelay.dev recommendations started around Aug 2026.

What are some alternatives?

When comparing sish and EchoRelay.dev, you can also consider the following products

ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.

Paragon - Paragon offers routing, scheduling, and transport logistics optimization software.

localhost.run - Instantly share your localhost environment!

Nango - The fastest way to ship integrations with 500+ APIs

Portmap.io - Expose your local PC to Internet from behind firewall and without real IP address

Prismatic.io - The integration platform for B2B software companies.