# | Ask this | Good sign | Red flag |
|---|
1 | Does the app say where its planetary positions come from? | It names a source, like the Swiss Ephemeris or NASA JPL | No mention anywhere |
2 | Does it ask for your birth time, and say what happens without it? | It explains that your rising sign and houses need it | It shows a rising sign without a birth time |
3 | Does it tell you its house system? | You can see it, and ideally change it | Hidden or unexplained |
4 | Does it read your whole chart, or one placement at a time? | The reading mentions how placements work together | Every line could be pasted onto any chart |
5 | Does it separate fast and slow movers? | "The Moon is in Taurus" and "Saturn takes two years" are treated differently | Every planet gets the same daily weight |
6 | Can it say what it doesn't know? | It admits limits, like "for inspiration only" | It promises outcomes or exact dates |
7 | Can you check it against another chart? | You can compare your Sun, Moon and rising with a free chart | It's a black box |
If an app passes most of these, the math and the setup are probably sound. The reading is up to you.
A 10-minute test
Compare your big three. Make a free chart from any well-known chart tool, and see the Sun, Moon and rising sign in your app. If they match, the sky math and your setup agree. If not, check your birth time and place first, then the time zone.
Try a close friend's chart. Enter someone you know well. Does the description sound like them, or like anyone?
Watch it for a week. Does the daily reading change in a way that follows real changes, like the Moon changing sign, or does it just rotate texts?
Look for the "no." Does the app ever say something you didn't want to hear, or only flatter?
Ask one question. Does it explain why it says what it says, such as which planet is touching which point?
Five checks tell you a lot about any app.
Why one reading can feel "so accurate"
Readings that feel spot-on often use wording that fits many people, a pattern called the Barnum effect. That doesn't make a reading useless. It means a single "wow, that's me" moment isn't proof. A better sign is a reading that stays useful over several weeks, and that you can trace back to something in your chart.
How Timing answers the checklist
We built Timing to pass this list.
Source. Every planet position and sky date in Timing, from your chart to the Moon phases, eclipses and retrogrades we publish, comes from the Swiss Ephemeris, a standard astronomical reference that professional astrology software is built on.
Method in the open. We tell you how a number is made, including what it leaves out. See how our compatibility score works.
Two systems. We read your Western chart and your Five Elements together. Five Elements is the Chinese system that reads your birth date as a mix of Wood, Fire, Earth, Metal and Water. You can see your mix on our Five Elements page.
Tuned by astrologers. Astrologers tune our readings and choose every tool inside Timing. The AI explains each reading in plain words, so you can see why it says what it says.
Honest about limits. We don't promise outcomes. Timing is for inspiration and planning, not medical, legal or financial advice.
Run the 10-minute test on Timing too. Start with your natal chart, compare it with any chart tool you trust, then open the app and see how your day reads. If you like to plan ahead, our astrology calendar 2027 shows the Moon phases, eclipses and Mercury retrogrades for the year. We think you'll like what you find. Get Timing on the App Store
Frequently asked questions
Is Co-Star accurate?
It depends on what you mean. "Accurate" covers the sky math, the chart setup and the reading, and an app can be strong in one and weaker in another. The 7-point checklist and the 10-minute test work on Co-Star and on any other app.
How do I know if an astrology app is accurate?
Check whether it names its source for planetary positions, asks for your birth time, shows its house system, reads your whole chart, and admits what it can't know. Then compare your Sun, Moon and rising sign with a free chart.
Why is my rising sign different in two apps?
Usually the birth time or place differs, or the app isn't using the exact time zone. Your rising sign changes about every two hours.
What is a house system?
The method used to divide your chart into twelve houses. Whole Sign and Placidus are common, and they can place the same planet in different houses.
Can an astrology app predict my future?
Astrology works best as a lens for reflection and planning, not a forecast of events. A good app treats readings as a reflection to check against your own life.
