SitApp and Stretchly are both desktop apps that help you stay healthy at your desk. But they work in completely different ways. Stretchly is a break reminder — it tells you when to stop and stretch. SitApp is a posture monitor — it watches how you sit and nudges you when you slouch.
Full disclosure: I built SitApp. Stretchly is a great tool, and I’ll be upfront about when it’s the better choice.
Quick Comparison
| Feature | SitApp | Stretchly |
|---|---|---|
| Type | AI posture detection | Break reminder |
| Platforms | Mac, Windows, Linux | Mac, Windows, Linux |
| Pricing | Free tier / $3.99/mo Pro | Free (open source) |
| AI detection | Yes (webcam + TensorFlow.js) | No |
| Webcam required | Yes | No |
| Break reminders | Yes | Yes (core feature) |
| Open source | No | Yes (BSD) |
| Customisable breaks | N/A | Highly customisable |
Different Tools, Different Jobs
Stretchly: Break Reminders on a Schedule
Stretchly runs in the background and reminds you to take micro-breaks (short pauses) and regular breaks (longer stretches) at configurable intervals. It can display stretching ideas, block your screen during breaks, and track your break compliance.
Stretchly has no idea whether you’re slouching. It fires on a schedule — every 10 minutes, every 30 minutes, whatever you configure. The philosophy is simple: regular breaks prevent problems.
SitApp: AI-Powered Posture Monitoring
SitApp uses your webcam and AI to detect when your posture drifts from your calibrated baseline. It only alerts you when something is actually wrong. If you’re sitting perfectly, SitApp stays silent.
Between breaks, you can slouch for 20 minutes straight without Stretchly noticing. SitApp catches that.
When Stretchly Is the Better Choice
- You don’t have a webcam or don’t want to use one
- Break scheduling is your priority — Stretchly’s break system is more customisable than anything else
- You want free and open source — Stretchly is BSD-licensed, fully free
- Screen blocking — Stretchly can force you to take breaks by blocking your screen (SitApp doesn’t do this)
- You already have good posture and just need break reminders
When SitApp Is the Better Choice
- You want to know when you’re slouching — Stretchly can’t tell
- Timer reminders annoy you — SitApp only interrupts when there’s a real posture problem
- You work from multiple setups — SitApp adapts to each desk with location-aware calibration
- You want fewer false alarms — AI detection means alerts only when you’re actually slouching
Can You Use Both?
Absolutely. They’re complementary:
- Stretchly handles your break schedule — micro-breaks and stretch reminders
- SitApp monitors your posture during active work between breaks
This is actually the ideal setup for desk health: regular breaks (Stretchly) plus real-time posture awareness (SitApp).
Pricing
Stretchly is completely free and open source (BSD license). Zero cost, forever.
SitApp has a free tier with core posture monitoring. Pro costs $3.99/month for unlimited monitoring and advanced features.
If budget is the only factor, Stretchly wins. But SitApp’s free tier gives you real AI posture detection at no cost.
Platform Support
Both support Mac, Windows, and Linux. Both are Electron-based apps. This is a tie.
Bottom Line
Stretchly and SitApp solve different problems. Stretchly is a break timer — it schedules your pauses. SitApp is a posture detector — it knows when you’re slouching. You don’t have to choose one: run both for complete desk health coverage. But if you only want one, pick based on your biggest problem — forgetting to take breaks (Stretchly) or forgetting to sit up straight (SitApp).
Ready to try SitApp? Download it free for Mac, Windows, or Linux.
For more options, see our best free posture reminder apps or our full 7 best posture apps comparison.
FAQ
Is Stretchly a posture app?
No. Stretchly is a break reminder app. It tells you when to take breaks on a schedule but doesn’t detect or monitor your posture.
Can Stretchly detect slouching?
No. Stretchly doesn’t use your webcam or any sensors. It works on timers only. If you want slouch detection, you need an AI posture app like SitApp.
Is Stretchly free?
Yes. Stretchly is free and open source under the BSD licence. SitApp also has a free tier, but Pro features require a $3.99/month subscription.
Should I use Stretchly and SitApp together?
Yes, they work well together. Stretchly handles break scheduling while SitApp monitors your posture in real time. It’s the most complete desk health setup you can get.