Sunset Verify
we grade our own homework.
Every evening, Vesper publicly scores its own sunset prediction. The only weather app with the transparency to do that.
How it works
three steps, every evening.
Predict
Each afternoon Vesper scores the coming sunset 0–100 using atmospheric data from SunsetWx.
Capture
After sunset, rate the sky with a tap or snap a photo. Your photo stays on your device.
Grade
Vesper compares its prediction to your rating and publishes the match. No hiding, no spin.
Your sunset journal
every sky you’ve verified.
Every prediction, every rating, every photo — collected in a scrollable timeline. Watch your accuracy track record build over weeks and months.
Photos never leave your device. The journal is yours alone.
Mar 28 · San Francisco
Predicted 81 · Rated 9/10 · 91% match
Mar 27 · San Francisco
Predicted 43 · Rated 5/10 · 88% match
Mar 26 · San Francisco
Predicted 92 · Rated 10/10 · 98% match
Live Activity
the countdown is on your lock screen.
As golden hour approaches, a Live Activity appears on your lock screen and Dynamic Island. The sunset score, the time remaining, and a gentle nudge to look up.
Transparency
why nobody else does this.
Risk
Publishing your accuracy means admitting when you’re wrong. Most apps would rather not.
Effort
Verification requires user interaction, atmospheric modeling, and a scoring system. It’s hard to build.
Philosophy
Most weather apps are ad platforms. Vesper is an editorial product. The incentives are different.
How does Sunset Verify work?
Sunset Verify predicts sunset quality on a zero to one hundred scale each afternoon using atmospheric data from SunsetWx. After sunset you can rate the sky or snap a photo. Vesper compares its prediction to your rating and publishes the accuracy score, building a transparent track record over time.
Frequently Asked Questions
What data does Sunset Verify use?
Sunset Verify uses atmospheric data from SunsetWx including cloud cover, humidity, and aerosol levels to generate a sunset quality prediction on a 0-100 scale.
Do I have to take a photo to verify?
No. You can verify by tapping a star rating. Photos are optional and stored only on your device, never uploaded to Vesper servers.
How accurate are the sunset predictions?
Accuracy varies by location and conditions. Vesper publishes its rolling accuracy score transparently so you can see exactly how well it performs over time.
Can I see past sunset predictions?
Yes. Your personal sunset journal stores every prediction, your rating, and the accuracy match in a timeline view you can scroll through.
Does Sunset Verify work everywhere?
Sunset Verify works for any location where SunsetWx has atmospheric data coverage, which includes most populated areas worldwide.