NSLookup Z vs JS Server
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NSLookup Z
This tool allows for fast and secure DNS record lookups, supporting encrypted queries and a variety of popular DNS servers. Users can also configure custom DNS servers for complete control over their network analysis.
- Query DNS records (A, AAAA, CNAME, TXT, etc.)
- Support for DoH & DoT encrypted lookups
- Includes popular DNS servers (Google, Cloudflare)
- Option to customize DNS servers
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NSLookup Z: A Powerful & Secure DNS Lookup Tool – Easily query DNS records (A, AAAA, CNAME, TXT, …) with high speed and accuracy for reliable network analysis. • Key Features: → Query DNS records (A, AAAA, CNAME, TXT, …) instantly → Support DoH & DoT for encrypted and secure lookups → Built-in popular DNS servers: Google, Cloudflare, NextDNS, Quad9, … → Customize your own DNS server for full control
JS Server
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Server turns your iPhone or iPad into a developer-friendly HTTP host. Point a listener at a file and it gets served. Write JavaScript and it runs. WHAT YOU CAN DO Serve static files Pick a file from the Files app, or edit one inline. Custom Content-Type per listener. A default HTML page is provided for quick smoke tests. Write JavaScript routes Every JavaScript listener gets an Express-like surface running inside JavaScriptCore. Register routes with server.get, server.post, server.all, and respond with res.html, res.json, res.text, res.send. Set status and headers fluently. No Node dependency. Your code evaluates on device. Read and write files from JS A sandboxed fs module is bridged through Swift: readFile, writeFile, exists, mkdir, readdir, unlink, stat. Every listener gets its own private directory. Any path that tries to escape the sandbox is rejected. Call external APIs Outbound fetch is bridged too. Pass a URL, optionally a method, headers, or a body, and get back status, ok, headers, text, and json. Perfect for proxies, webhooks, or quick integrations. Run multiple listeners at once Each listener runs on its own port, started and stopped independently. Bonjour advertises them on your local network so peers can find them by name. Live Activities A listener running in the background shows up in the Dynamic Island and on the Lock Screen with the port and request count. Inspect every request The Console panel logs every HTTP request, every console.log, and every runtime error. Tap an HTTP row to expand the full request (method, URL, headers, body) and response (status, headers, body, timing). Syntax highlighting In-app editor with an IDE-style dark theme for JavaScript, Python, and HTML. WHO IT IS FOR Developers prototyping APIs on the go. QA engineers testing mobile clients against a controllable backend. Anyone who needs to serve a JSON blob, a mock endpoint, or a small HTML page from their iPad without setting up a real server. PRIVACY No accounts, no telemetry, no analytics. Nothing leaves the device except the HTTP responses you explicitly send. All code, data, and logs live in your app sandbox. Questions or feedback: server@cyber-man.pl
Screenshots
Verdict
The clearest difference is price: NSLookup Z at Free against JS Server's $4.99. JS Server's advantage is in-app purchases (none vs 1) and update cadence (daily vs every 5 days). On ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
NSLookup Z is free to download; JS Server costs $4.99 up front. NSLookup Z sells 1 one-off in-app purchase. JS Server asks for nothing beyond the download.
NSLookup Z ships an update every 5 days, JS Server daily. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.
| Parameter | NSLookup Z | JS Server |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 5.0 (7 ratings) — better | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 5 days | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Phan Nhut | Tomasz Dbrowski |
In-app purchases
NSLookup Z
- Pro$1.99
JS Server
No in-app purchases









