Choosing software

Offline vs online kundali software

A web kundali generator and an installed program can produce the same chart, but they differ on four things that matter for professional use: where the birth data goes, whether you control the calculation settings, whether a chart is reproducible later, and whether it works when the connection does not.

Sarathi Services TeamUpdated 8 September 2026

Written and reviewed by the team that builds the Jyotish Sarathi calculation engine.

Key takeaways

Privacy: an online generator receives the birth details on a server. Offline software computes locally, so nothing is sent.
Reliability: offline works in a village with no signal, on a plane, during an outage. Online does not.
Control: web tools usually fix the ayanamsha and the siddhanta. Installed software can expose them.
Reproducibility: a web tool can change its calculation between visits without telling you. A local install changes when you update it.
Online's genuine advantage is zero install and instant access from any device — which is why quick lookups belong there and professional work does not.

The four real differences

	Online generator	Offline software
Where birth data goes	To a server you do not control	Stays on the device
Works without a connection	No	Yes
Ayanamsha / siddhanta control	Usually fixed by the site	Can be exposed as settings
Same chart next year	Only if the site has not changed its engine	Yes, until you update
Setup	None	An install
Device coverage	Any browser	Whatever platforms are built

Privacy: a birth chart is personal data

A date, an exact time and a place is a precise identifier. Submitted to a web form, it leaves your control: you cannot see what is logged, how long it is kept, or what it is joined to. For your own curiosity that may be an acceptable trade. For a client's details, entered on their behalf, it is a decision you are making about someone else's data.

Offline software removes the question rather than answering it. If the calculation happens on the device, there is nothing to log. In Jyotish Sarathi all astronomical computation is local and no account is needed to cast a chart; cloud sync exists for people who want their saved profiles on more than one device, and it is opt-in — see the privacy policy.

Reliability: the connection is not always there

In Nepal and much of India, connectivity outside the larger towns is uneven, and an astrologer consulting at a client's home cannot design around it optimistically. Offline software has no failure mode here — the ephemeris is bundled with the app, so a chart for any date in the 1768–2293 AD range is available with the device in flight mode.

Control: who chooses the ayanamsha?

This is the difference practitioners notice last and care about most. Most free web generators fix the ayanamsha at Lahiri and do not expose the computation method at all. If your lineage uses Raman, or your panchanga is traditional Surya Siddhanta, the site will produce charts that disagree with your practice and give you no way to correct them.

Reproducibility: will the chart be the same next year?

A web tool can update its engine, change its default ayanamsha, or switch ephemeris libraries between two of your visits, and you will not be told. If you produced a chart for a client last year from a site, you cannot guarantee you can produce the identical chart today.

Installed software changes when you update it, which at least makes the change an event you are aware of. Better still is software whose output records the settings it used, so a chart carries its own provenance regardless — which is why a cheena that prints the siddhanta and ayanamsha is more useful than one that does not.

What online is genuinely better at

Zero setup. Nothing to install, works from a borrowed phone.
Quick one-off lookups. Checking today's tithi or a rough chart for curiosity.
Sharing a link. Handing someone a URL is easier than telling them to install an app.

Those are real advantages, and the honest recommendation is not "never use a web tool". It is: use one for casual lookups, and use installed software for anything you will act on, hand to a client, or need to reproduce.

Where Jyotish Sarathi sits

It is installed software on Android, Windows and macOS, computing locally from a bundled ephemeris, with the siddhanta and ayanamsha exposed as settings and recorded on every chart. Optional cloud sync covers the one thing offline software is worse at — having your saved profiles on more than one of your own devices. The full calculation path is documented on the methodology page.

Frequently asked questions

Is offline kundali software more private?

Yes, materially. An online generator receives the birth date, exact time and place on a server you do not control, and you cannot see what is retained. Offline software computes on the device, so the data is never sent at all.

Are offline charts as accurate as online ones?

Accuracy depends on the ephemeris and the settings, not on where the computation runs. Offline software bundles the ephemeris data with the app, so it can be exactly as accurate — and because it usually exposes the ayanamsha and siddhanta, it is often easier to make it agree with your own tradition.

Why do free web kundali tools not let me change the ayanamsha?

Usually to keep the interface simple; most fix it at Lahiri. That is a reasonable default but it is a choice made for you, and it matters because ayanamsha systems differ by more than a degree — enough to change a nakshatra pada.

Does Jyotish Sarathi need an internet connection?

Not to cast a chart. All astronomical calculation runs on the device from a bundled ephemeris covering 1768–2293 AD. A connection is used only for birth-place lookups, updates, and optional cloud sync between your own devices.