Dev tools · alternatives · 2026
24 alternatives to userstack
Instant, Secure User-Agent String Lookup JSON API
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. userstack launched in 2021; newer entries below may have overtaken it.
- 1
Ditch your scraper. Make one API call with any tool.
Jun 2026 · tabstack.ai · its alternatives →
- 2
Automate the web in your app or agent, no browser to host
Jul 2026 · tabstack.ai · its alternatives →
- 3
Scrape and parse websites with a single endpoint
2015 · its alternatives →
- 4
- 5TB
Hi HN, My team and I are building Tabstack to handle the "web layer" for AI agents. Launch Post: https://tabstack.ai/blog/intro-browsing-infrastructure-ai-ag... Maintaining a complex infrastructure stack for web browsing is one of the biggest bottlenecks in building reliable agents. You start with a simple fetch, but quickly end up managing a complex stack of proxies, handling client-side hydration, and debugging brittle selectors. and writing custom parsing logic for every site. Tabstack is an API that abstracts that infrastructure. You send a URL and an intent; we…
Jan 2026 · its alternatives →
- 6
Extract web data and automate browsers, no scraper required.
Apr 2026 · tabstack.ai · its alternatives →
- 7AP
Hey HN, we're Alexi and Jonas the co-founders of Autotab (https://autotab.com). Autotab is a chrome-based browser you can teach to do complex tasks, with a simple API for running them from your app or backend. Here is a walkthrough of how it works: https://youtu.be/63co74JHy1k, and you can try it for free at https://autotab.com by downloading the app. Why a dedicated editor? The number one blocker we've found in building more flexible, agentic automations is performance quality BY FAR…
2024 · its alternatives →
- 8AJ
Hey HN, we’re building an open specification that lets agents discover and invoke APIs with natural language, built on the OpenAPI standard. agents.json clearly defines the contract between LLMs and API as a standard that's open, observable, and replicable. Here’s a walkthrough of how it works: https://youtu.be/kby2Wdt2Dtk?si=59xGCDy48Zzwr7ND. There’s 2 parts to this: 1. An agents.json file describes how to link API calls together into outcome-based tools for LLMs. This file sits alongside an OpenAPI file. 2. The agents.json SDK loads agents.json files as tools for an LLM that…
2025 · github.com · its alternatives →
- 9
- 10
- 11
Run a research agent with cited answers in a single API call
Jun 2026 · tabstack.ai · its alternatives →
- 12IR
Sharing an internal tool that accelerated my development work 10-fold, especially with API debugging. Thought fellow developers here might find it useful. As a developer, I often have trouble reproducing errors at the client end. https://intercept.rest lets me debug and monitor API requests and responses. It is similar to the Network tab in Chrome Developer Tools but works for any API: mobile apps, webhooks, frontend etc. After I shared it with a close circle of friends, they found it incredibly useful and even found new use cases, I never imagined. Been a long time lurker here and…
2018 · its alternatives →
- 13
- 14
- 15RE
Hey HN! We built a browser-based agent that runs inside an authenticated web app, watches how the app calls its own APIs, and automatically turns those into agent tools. You can think of it as an auto-generated MCP server that self-updates as the host app changes. The result is a skilled AI assistant that actually integrates deeply with any product (not just chat and RAG) with minimal effort. Check out these short demos below that show the agent in software you're probably familiar with: - Jira: https://demo.frigade.com/hn?skill=jira - Spotify:…
Jul 2026 · its alternatives →
- 16
- 17CL
2018 · github.com · its alternatives →
- 18AS
2015 · openbucket.io · its alternatives →
- 19IM
2013 · skr.io · its alternatives →
- 20AT
2013 · webhookinbox.com · its alternatives →
- 21AB
2011 · developers.snapbill.com · its alternatives →
- 22AA
2013 · apiforthat.com · its alternatives →
- 23BJ
Just a simple tool I hacked together last night. I wanted to paste a bunch of JSON for reference in an IRC channel, but the JSON that I wanted to paste was not formatted. I didn't quickly find a pastebin that formatted JSON for me so I just made one. It's probably so simple that it's borderline useless, but here it is! http://jsonifier.com/ example output: http://jsonifier.com/paste/4e3f84b46f3b792dde000000
2011 · its alternatives →
- 24
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →