Written by LiquidUser, which competes with Syften. Last checked against Syften's own pricing page.
LiquidUser vs Syften
Syften is a keyword alert service for online communities, running since 2019. You write filters, and it sends matching posts from Reddit, Hacker News, Bluesky, Mastodon, Indie Hackers, Discourse, Slack groups, Stack Exchange, GitHub, podcasts and more by email, Slack, RSS, API or webhook.
Syften sends you every post that matches your filters. LiquidUser works out what your product solves and shows the people who need it, with the reason for each.
Where each one is better
What Syften does better
Syften shows who mentioned you in the last 60 days as soon as you sign up, and aims for under a minute of delay on Reddit. It watches more than fifteen communities, from Reddit and Hacker News to Mastodon, Discourse and Slack groups, and has been running since 2019, with named testimonials from Arvid Kahl, Rob Fitzpatrick and PostHog's James Hawkins.
Pick Syften if you know your keywords and want fast, broad alerts, Reddit included.
What LiquidUser does that Syften doesn't
- It starts from your website, so there are no filters to write, and shows what it understood with the page behind each claim.
- It maps each conversation to the claim on your own site it matches, with the page it came from, so you can check the fit in seconds.
- Every person comes with a reply draft or brief that you post yourself, from your own account. Nothing is ever sent for you.
- Memory carries your corrections, competitors and known customers across days, so tomorrow's list starts from what you taught it today.
Side by side
From Syften's own site and LiquidUser as it works today, checked on 29 September 2026.
| Feature | LiquidUser | Syften |
|---|---|---|
| Getting started | ||
| Starts from your website, no keyword list | Yes | No |
| Shows what it understood, with the page for each claim | Yes | No |
| Try it before paying | Free scan, no account | 14-day trial, 60 days back |
| Sources | ||
| Hacker News | Yes | Yes |
| X | Official API, read only | Paid add-on |
| Reddit, Bluesky, Mastodon and 12 more | No | Yes |
| Results | ||
| Reddit delay | Not read | Under a minute |
| Maps each result to the claim on your site it matches | Yes | No |
| Memory of your corrections and customers across days | Yes | No |
| Replies | ||
| Reply drafts you post yourself | Yes | No |
| Access and price | ||
| MCP access for agents | Yes | PRO plan |
| Entry price | $49/mo | $29.95/mo |
Syften pricing on 29 September 2026: Entry $29.95 a month: 3 community filters, 100 results a day, 7 days of archive. Standard $49.95 a month: 20 filters, AI filtering, API and Slack, with X and YouTube as paid add-ons. PRO $119.95 a month: 100 filters, unlimited archive, webhooks and MCP. 14-day trial, no card. Source: syften.com/pricing.
Questions
- Does Syften cover more communities than LiquidUser?
- Yes. Syften watches more than fifteen, including Reddit, Bluesky, Mastodon, Indie Hackers, Discourse and Slack groups, with X as a paid add-on. LiquidUser reads X and Hacker News.
- Do I have to write keywords in LiquidUser?
- No. Paste your website, check what LiquidUser understood, correct anything wrong, and it searches from that.
- What do the two cost?
- Syften is $29.95, $49.95 or $119.95 a month, as listed on syften.com/pricing on 29 September 2026. LiquidUser is $49 a month, and its scan is free.
What we promise
How we read each source- We never post for youNo replies, likes, follows or messages in your name. You post every reply yourself.
- No bots, no account pools, no proxiesNothing signs in as anyone, and nothing scrapes.
- No fake numbersNo invented counters, testimonials or countdown timers. Every number comes from real data or the plan's own limits.
- Official APIs onlyX through its paid API, Hacker News and Bluesky through their public ones. Read only.
- Briefs on Hacker NewsHN bans generated comments, so there you get what to say and write the reply yourself.
Run the scan on your own site
Paste your website. LiquidUser shows what it understood, then the people already describing the problem you solve, before you pay anything.
One plan, $49 a month. See what it includes