Dev tools · alternatives · 2026
24 alternatives to Discover a user's contacts without ever knowing their contacts
A privacy-preserving contact discovery server. Contribute to SilentCircle/contact-discovery development by creating an account on GitHub.
This is a privacy-preserving contact discovery server that identifies which of a user's contacts are registered on a service without exposing the contact list itself. Developed as an open-source project, it allows… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Discover a user's contacts without ever knowing their contacts launched in 2015; newer entries below may have overtaken it.
- 1MS
2015 · blog.filippo.io · its alternatives →
- 2AF
Hey HN! I have been working on this project for a while, and I think this solves a problem that a lot of people here have: not being able to easily search Discord servers. Currently, I only scrape servers that are marked as "discoverable" on Discord. However, if there's enough interest in the project, I'm open to adding specific servers by request. I'm primarily focused on informational servers rather than casual hangout spaces, such as open source projects, Minecraft mods, and support communities for tools, services, or platforms (for example, hosting providers). I have placed restrictions…
2025 · searchcord.io · its alternatives →
- 3
Create unlimited email aliases for free. Protect your real email from spam by using a different address for each service. Privacy friendly, anonymous replies.
2019 · anonaddy.com · its alternatives →
- 4
- 5
Persodex▲104Hey HN, I built a personal CRM that stores everything in the native iPhone Contacts app instead of another database. The goal was to make the Contacts app I’ve used for years actually useful. I’d love to hear what you think. Especially whether you prefer extending native apps over adopting entirely new tools. Since this is one of the first releases, i would love to get any feedback you have! Alex
Aug 2026 · persodex.com · its alternatives →
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Hi HN, We (myself, Adhyyan1252 and yush_g) are undergrad students that hacked out this side project last month during Hack Lodge[1] (the ideas and many of the underlying circuits for which came from the 0xPARC community[2])! We’re extremely excited to share this new primitive. Besides the technical challenges building this project that folks here would find interesting (fixing the ZK proof compiler, modifying nodeJS V8 params etc.), we think this is a very novel use case for ZK tech, and ECDSA inside ZK-SNARKs is a starting point that unlocks many other ideas! :D A summarized version of our…
2022 · github.com · its alternatives →
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- 9
Layers▲61The private network strangers literally can't reach you on.
Apr 2026 · layers-app.com · its alternatives →
- 10
- 11DP
2018 · stealthy.im · its alternatives →
- 12
SafeSwiss▲73Encrypted chat, voice/video calls, emails, storage
2021 · safeswiss.com · its alternatives →
- 13CF
2013 · contactsanalytics.com · its alternatives →
- 14
Neucards is an end-to-end encrypted contact information sharing and updating iOS app that protects your identity while letting you keep in touch with people. I started working on neucards as a side project more than ten years ago, and I decided three years ago to go full-time and try to build a community around it. There are two major problems that neucards addresses. First, most people end up with contact lists that are hopelessly out of date. Over time, people move, change jobs, or add social profiles and unless they tell you, chances are you could lose touch. Second, your contact…
2023 · neucards.com · its alternatives →
- 15
Precise Ultrawideband Contact Tracing & Occupancy Control
2020 · fellowai.com · its alternatives →
- 16
hey guys, wanted to show one of my side projects i just made public. the idea is basically another osint tool for pentesters and bug bounty hunters. it watches certificate transparency logs and checks newly-seen domains for exposed stuff like .env files, open .git dirs, config files, db dumps and so on, and puts whatever it finds into a searchable db. you just search a domain (or part of one) and see what's exposed. it's read-only and free. one thing i've been thinking about adding is a way to register for certain keywords and get notified when something new shows up for that search. would…
Jul 2026 · search.cerast-intelligence.com · its alternatives →
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Scripta.▲36Privacy-first AI notetaker that records, transcribes, and summarizes your meetings directly on your device, without joining as a bot.
Feb 2026 · getscripta.app · its alternatives →
- 19AL
Hi HN, I’m one of the maintainers of Bridge Anonymization. We built this because the existing solutions for translating sensitive user content are insufficient for many of our privacy-concious clients (Governments, Banks, Healthcare, etc.). We couldn't send PII to third-party APIs, but standard redaction destroyed the translation quality. If you scrub "John" to "[PERSON]", the translation engine loses gender context (often defaulting to masculine), which breaks grammatical agreement in languages like French or German. So we built a reversible, local-first pipeline for Node.js/Bun. Here…
Dec 2025 · medium.com · its alternatives →
- 20
This is a community forum for people who use, build, and run things on Nostr. Whether you are taking your first steps with keys and zaps, ship relays and clien…
23d ago · nostr-proto.org · its alternatives →
- 21
Quickly and securely pseudonymize email addresses for free
2020 · app.narrative.io · its alternatives →
- 22
Anonymous Number, Hidden ID
2025 · apps.apple.com · its alternatives →
- 23
Open-source contact tracing app focused on privacy.
2020 · github.com · its alternatives →
- 24
CipherDrop▲18Share Secrets With Zero Trace. Zero Accounts. Zero Worry.
2025 · cipherdrop.app · its alternatives →
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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 →