Looking for a Co–Star alternative?
Co–Star is a phone app built around short, personalised daily horoscopes. OrbHeaven is a web app built around a chart you can check, a calendar of real dates, and a record it keeps with you over time.
OrbHeaven vs Co–Star
Both products start from the same raw material — your birth date, time and place — and then diverge almost immediately. Co–Star turns it into something that arrives on your phone regularly without being asked for. OrbHeaven turns it into a chart you can interrogate and a calendar you can plan against, and then asks you afterwards how the period it flagged actually went.
| What is being compared | OrbHeaven | Co–Star |
|---|---|---|
| How each describes itself | A chart, a calendar and a record you build over time | "Hyper-Personalized, Real-Time Horoscopes" |
| Full birth chart with no account | Yes, at /birth-chart. Nothing typed into it is stored | Not published on their site |
| Calculation method stated on the chart | Yes — astronomy-engine 2.1.19, Placidus, and the exact universal time, printed on the chart | Not published on their site |
| Where a language model is involved | Interpretation only. It never computes a position | Not published on their site |
| Where you use it | Installable web app. No App Store or Play listing | iOS app |
| Price | Free tier that keeps working; Plus is $12 per month | Not published on their site |
Every Co–Star detail above comes from Co–Star’s own website or support pages, checked on 24 September 2026. Where a cell says “not published on their site”, we could not find the answer published by the company itself and chose to leave it blank rather than guess. Apps billed through the App Store or Google Play often list their price only in the store, so a missing price is usually just where they put it.
What Co–Star does well
Co–Star solved a problem most chart tools never even attempt: getting astrology to somebody who has not set aside time for it. By its own description the horoscopes are personalised from your birth chart and delivered in real time, which means the product comes to you. You do not have to remember to open it, decide what to look up, or know enough astrology to form a question.
That is genuinely hard to do well, and it is a different craft from calculating a chart accurately. A daily line has to be short enough to read in the queue for coffee and specific enough to feel like it was written for you. Getting that right is a real skill, and it is not one a chart tool needs at all.
It is also a real iOS app, with everything that follows: it is in the store, it is searchable there, it installs the way people expect, and it can use the phone’s notification system natively. OrbHeaven has none of that.
How OrbHeaven approaches astrology
The whole product rests on one distinction: the difference between what was calculated and what was written.
Where your planets were at the moment you were born is arithmetic. It has a right answer, it is reproducible, and anybody with the same ephemeris should get the same numbers. OrbHeaven computes that locally with an open astronomical engine, and then prints on the chart which engine, which version, which house system, which node convention and what exact universal time it used. Birth times are converted using the daylight saving rules actually in force at that place on that date, which is a detail that quietly changes the Ascendant when it is got wrong.
What a placement means is not arithmetic. It is interpretation, and a language model writes it. That part is labelled as interpretation and framed as something to think with rather than a forecast of what will happen. The model is never asked where a planet was; it is handed the numbers and asked to read them.
One consequence is worth stating because most tools do the opposite: if you do not know your birth time, OrbHeaven will not invent an Ascendant. It withholds the angles and the houses, tells you the Moon could be in either of two signs and names which, and says so on the page. Half a chart honestly labelled is more use than a whole one quietly guessed.
The differences that actually matter
A feed, or a record
Co–Star’s own framing is real-time horoscopes: something that keeps arriving. OrbHeaven is built the other way round. It flags a stretch ahead with real dates, and when that stretch has passed it comes back and asks how it went, keeps your answer, and uses it in what it says next. Over months that becomes a record of your own that the product reads back to you. If you have ever wanted to know whether the thing an app told you in March turned out to mean anything, that is the gap this is built for.
Whether you can check the working
We could not find Co–Star’s calculation method published on its site, so we cannot tell you what it uses and we are not going to guess. What we can say is what OrbHeaven does: the engine, its version, the house system, the node convention and the exact universal time appear on every chart, so a working astrologer can see immediately whether our conventions match theirs, and disagree with the output on specific grounds rather than general suspicion.
Where it lives
Co–Star is an iOS app. OrbHeaven is a web app you can install to a home screen but cannot download from a store. Which of those is better depends entirely on you: one gives native notifications and store discovery, the other opens from a link on any device with nothing to install and no store account.
What it costs to look
OrbHeaven’s full chart is free, needs no account and stores nothing, so you can see the whole thing before deciding anything. Its paid tier is $12 a month or $99 a year, and the free tier is not a trial — it keeps working. Co–Star does not publish a price on its website.
Who might prefer Co–Star
- You want astrology to arrive without being fetched, in small daily pieces, on your phone.
- You would rather not learn what a house system is, and see no reason you should have to.
- A native iOS app matters to you — store install, native notifications.
- Your friends are on it, and the point is partly the shared reference rather than the astrology.
Who might prefer OrbHeaven
- You want to see where a claim came from, and be told which conventions produced it.
- You are in the middle of an actual decision and want dates, not a daily mood.
- You want the thing to remember what you said and read your own record back to you.
- You do not know your birth time and would rather be told what that makes unknowable than handed a confident guess.
Neither of these is the better product in the abstract. They are answers to different questions, and plenty of people reasonably use something like Co–Star for the daily habit and something like OrbHeaven when a real decision turns up.
Questions people ask
Is OrbHeaven a Co–Star alternative?
It is an alternative in the sense that both read a birth chart, but they are built for different habits. Co–Star describes itself as hyper-personalised, real-time horoscopes, delivered through an iOS app. OrbHeaven is a web app built around a chart that shows how it was calculated, a calendar of dated stretches ahead, and a record of how those stretches actually went. If what you want is a short daily read on your phone, that is Co–Star's shape rather than ours.
How is OrbHeaven different from Co–Star?
The clearest difference is what each one shows you about its own working. Every OrbHeaven chart prints the engine and version it used, the house system, the node convention and the exact universal time the chart was cast for. Co–Star does not publish its calculation method on its website, so we cannot tell you what it uses. The second difference is shape: Co–Star is an iOS app, and OrbHeaven is an installable web app with no App Store listing.
Does OrbHeaven offer birth charts?
Yes, and without an account. The free chart at /birth-chart gives you every placement, house and aspect, with each term explained where it appears. Nothing you type into it is stored — no account, no email address, no record of the birth details.
Does OrbHeaven use AI?
Yes, for interpretation only, and the distinction matters. Positions are computed by an open astronomical engine running locally; a language model never calculates where a planet was. It reads what the engine produced and writes the interpretation. That is why a chart can name its own engine and version — the arithmetic is reproducible, and the writing is clearly labelled as the part that was written.
What does Co–Star cost?
We do not publish a price for Co–Star because Co–Star does not publish one on its website. Apps billed through the App Store often list pricing only in the store listing, so the App Store entry is the place to check. OrbHeaven's own pricing is on the pricing page: a free tier that keeps working, and Plus at $12 a month or $99 a year.
Can I use OrbHeaven on my phone?
Yes. It is an installable web app, so it runs in a browser and can be added to a home screen, but there is no App Store or Google Play listing to download it from. That is a real trade-off against an app like Co–Star: you get no store presence and no native notifications, and you also need no store account and no install to try it.
Sources checked
Everything this page says about Co–Star comes from Co–Star’s own pages, read on 24 September 2026. Nothing here is taken from a review site.
- Co–Star’s website — how it describes itself, and the iOS app it declares
See your own chart, free
Every placement, house and aspect, with each term explained where it appears and the engine, house system and exact universal time printed underneath. No account, no email address, and nothing you type is kept.
No account, no email address, and nothing you type is kept.
Also worth reading: how we compare with The Pattern, another app built around personality rather than calculation, or with Astro.com, which sits at the opposite end entirely. There is also a round-up of the field organised by what you actually want, and every comparison we have written.