15Five shows you something is off. Ren helps you say something about it.
15Five
15Five is a performance management platform built around weekly check-ins, with 1:1 agendas, goals and OKRs, performance reviews, engagement surveys, recognition and manager training content. It gives leaders and HR a regular read on how people and goals are doing.
Ren
Ren is an AI app in Slack and Microsoft Teams for the conversations between people at work. It notices the conversations that aren't happening, helps you tell how serious a situation is on the Accountability Dial™, and helps you find the first sentence. For every seat, not only managers.
Short answer: 15Five and Ren work on different halves of the same problem. 15Five is a performance management platform: weekly check-ins, 1:1 agendas, goals, reviews and engagement surveys. Ren is an AI app in Slack and Microsoft Teams that helps people have the conversations those check-ins point to: early, in their own words, before a small pattern becomes a review item. If you need the check-in cadence and the record, that's 15Five. If people keep putting off the conversations, that's Ren. Plenty of teams use both.
Side by side
| 15Five | Ren | |
|---|---|---|
| What it is | Performance management platform | AI app for the conversations between people |
| Main job | Weekly check-ins, 1:1 agendas, goals, reviews, engagement surveys | Noticing the conversations that aren't happening, and helping you have them |
| When it works | Weekly check-ins and review cycles | Day to day, in the flow of work |
| Where it lives | Its own web app | Slack, Microsoft Teams and a web app |
| Who uses it | HR, leaders, managers and the people filling in check-ins | Everyone: ICs, peers, managers, leaders |
| Method | Check-in questions, templates and manager training content | The Accountability Dial™: Mention, Invitation, Conversation, Boundary, Limit |
| Privacy model | Check-ins and reviews are read by managers and HR | Can't read DMs; conversations with Ren stay private; team view is aggregate only |
The gap between the check-in and the conversation
15Five is good at making things visible that would otherwise go unseen: how someone's week went, which goal slipped, who deserves a shout-out. The check-in does its job. Then this happens:
- Friday's check-in comes back. Someone wrote "fine" for the third week running, and their goal is behind.
- The manager sees it, and has to decide what to do.
- Option one: put "check in" on Thursday's 1:1 agenda. By Thursday the pattern is three weeks old and the conversation arrives heavy.
- Option two: send a quick "everything okay?" in Slack. The answer is "yep, all good." The flag stays.
- Option three: wait and hope it sorts itself out.
None of that is 15Five's fault. The data was right. What was missing was the next step: knowing how serious this is, and the one sentence that opens it without making it a big deal. That's the part Ren works on.
What Ren adds
- It notices. In the Slack and Teams channels you add it to, Ren picks up the patterns: repeated slips, unanswered asks, work that deserved credit.
- It calibrates. Ren uses the Accountability Dial™ to suggest how direct to be. A first slip is a Mention. A pattern that keeps coming back is an Invitation to talk about it.
- It finds the words. Ren drafts the first sentence in your voice, and asks why this one is hard for you.
- It works in every direction. Peers, someone raising a concern with their manager, and praise, not just top-down feedback.
When to choose which
- Choose 15Five if you need weekly check-ins, OKR tracking, review cycles or engagement surveys, and a record of all of it.
- Choose Ren if the hard conversations aren't happening, or happen too late, or if you're a smaller team that doesn't need a full platform.
- Use both if you want the weekly visibility and the conversations that act on it.
Proof: in an independent blind study of 400+ responses, Ren scored 4.22 out of 5 on pushback and ownership, against 2.84 for ChatGPT, 2.68 for Copilot and 2.48 for Gemini. Built on a method taught to 100,000+ people leaders. SOC 2 Type II.
Related: How to prepare for a 1-on-1 meeting · All comparisons · Ren vs. Lattice · Ren vs. Culture Amp
The questions buyers actually ask.
What is the difference between Ren and 15Five?
15Five is a performance management platform: weekly check-ins, 1:1 agendas, goals, reviews and engagement surveys. Ren is an AI app in Slack and Microsoft Teams for the conversations between people: it notices when one isn't happening, helps you judge how serious it is, and helps you open it. 15Five tells you something is off. Ren helps you say the first sentence about it. Many teams use both.
Is Ren a 15Five alternative?
Only if what you are missing is the conversations, not the check-in cadence. If you need weekly check-ins, OKR tracking, review cycles or engagement surveys, 15Five does that and Ren does not. If you already have that visibility and people still put off the hard conversations, or you are a smaller team that doesn't need a full platform, Ren covers the part 15Five doesn't.
Can you use Ren and 15Five together?
Yes. They work at different points in time. 15Five runs the weekly check-in and the review cycle. Ren works in Slack and Teams day to day, so when a check-in flags a slipping goal or a quiet teammate, the next step is a light, early Mention instead of a heavy agenda item next Thursday. The check-in finds it. Ren helps someone say it.
Does 15Five help with difficult conversations?
15Five offers structure and learning: 1:1 templates, guided agendas and manager training content. Those help a conversation go better once it is on the calendar. What they don't do is show up on Monday, when the pattern appears in a channel, and help you decide how direct to be and what to say first. That moment is where Ren works.
Can you use Ren without 15Five?
Yes. Many teams using Ren have no check-in or review platform at all and keep goals in Notion, Linear or a spreadsheet. Ren doesn't depend on any other tool. It works from the Slack and Teams channels you add it to, and from a web app.
How does privacy compare?
15Five check-ins, goals and reviews are written to be read by managers and HR. Ren is private by design: it cannot read direct messages between people, your conversations with Ren are never shared with your manager or HR, and the team-wide view is aggregate and never traceable to a person. Ren is SOC 2 Type II.
See the difference for yourself. Seven days free.
No sales call required. Start a 7-day free trial and see the accountability layer working inside your team within a day. Nothing is charged until day seven.
Or read about the methodology behind Ren.